WO2002056391A1 - Dispositif electroluminescent - Google Patents
Dispositif electroluminescent Download PDFInfo
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- WO2002056391A1 WO2002056391A1 PCT/JP2002/000003 JP0200003W WO02056391A1 WO 2002056391 A1 WO2002056391 A1 WO 2002056391A1 JP 0200003 W JP0200003 W JP 0200003W WO 02056391 A1 WO02056391 A1 WO 02056391A1
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- light
- light emitting
- phosphor
- layer
- emitting device
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/26—Materials of the light emitting region
- H01L33/30—Materials of the light emitting region containing only elements of group III and group V of the periodic system
- H01L33/32—Materials of the light emitting region containing only elements of group III and group V of the periodic system containing nitrogen
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies
- H01L33/08—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor bodies with a plurality of light emitting regions, e.g. laterally discontinuous light emitting layer or photoluminescent region integrated within the semiconductor body
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/42—Wire connectors; Manufacturing methods related thereto
- H01L2224/47—Structure, shape, material or disposition of the wire connectors after the connecting process
- H01L2224/49—Structure, shape, material or disposition of the wire connectors after the connecting process of a plurality of wire connectors
- H01L2224/491—Disposition
- H01L2224/49105—Connecting at different heights
- H01L2224/49107—Connecting at different heights on the semiconductor or solid-state body
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/73—Means for bonding being of different types provided for in two or more of groups H01L2224/10, H01L2224/18, H01L2224/26, H01L2224/34, H01L2224/42, H01L2224/50, H01L2224/63, H01L2224/71
- H01L2224/732—Location after the connecting process
- H01L2224/73251—Location after the connecting process on different surfaces
- H01L2224/73265—Layer and wire connectors
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01025—Manganese [Mn]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01079—Gold [Au]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/12—Passive devices, e.g. 2 terminal devices
- H01L2924/1204—Optical Diode
- H01L2924/12041—LED
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
Definitions
- the present invention relates to a light emitting device. More specifically, the present invention relates to a light emitting device in which a group III nitride compound semiconductor light emitting element is combined with a phosphor, and a part of the light of the light emitting element is converted by the phosphor and emitted.
- a group III nitride compound semiconductor light emitting element is combined with a phosphor, and a part of the light of the light emitting element is converted by the phosphor and emitted.
- a part of the light from the light-emitting element is wavelength-converted by the phosphor, and the wavelength-converted light and the light from the light-emitting element are mixed and emitted to emit a color different from that of the light-emitting element itself
- Various light emitting devices have been proposed. For example, a light emitting device having a configuration in which a blue light emitting element is combined with a phosphor that is excited by blue light and emits light having a longer wavelength than blue light is known.
- blue light that is, light in the visible region is used as excitation light for the phosphor.
- the phosphor has different excitation efficiency or luminous efficiency depending on the wavelength of the excitation light, and generally, the excitation efficiency is reduced when light in the visible region is used as the excitation light. Therefore, in the above-described light emitting device, the excitation efficiency of the phosphor is low, and the light from the light emitting element cannot be converted into a wavelength with high efficiency and externally radiated. Further, the low excitation efficiency of the phosphor increases the loss of blue light of the light emitting element, and the amount of blue light radiated outside without being converted by the phosphor is also reduced.
- the amount of light obtained by wavelength conversion of light from the light emitting element and the amount of light from the light emitting element directly radiated to the outside without wavelength conversion are both small.
- the light emission amount (luminance) of the entire light emitting device decreases.
- the present invention has been made in view of the above problems, and an object of the present invention is to use a single light source (light emitting element) to emit light of a color different from the light emitting color of the light emitting element itself with high efficiency. And a light emitting device. In particular, white or two or more wavelengths It is an object of the present invention to provide a light emitting device capable of emitting light of a mixed color with high efficiency. Disclosure of the invention
- the present inventors have studied various improvements in a light emitting device using a group III nitride-based compound semiconductor as a material of a light emitting layer, and found that the light emitting device has a light emission peak wavelength in the ultraviolet region and a light emission peak wavelength in the visible region.
- a light-emitting element that can emit the light having the light.
- the present invention has been made based on the above study, and the configuration is as follows. That is,
- a light-emitting element comprising a group III nitride compound semiconductor and having a light-emitting layer that emits light in an ultraviolet region and light in a visible region with a light emission peak wavelength
- a phosphor that emits light having a wavelength different from that of the excitation light when excited by the light in the ultraviolet region.
- the phosphor is excited and emitted by the light in the ultraviolet region emitted by the light emitting element, and the light due to the emission and the light in the visible region emitted by the light emitting element are mixed and emitted outside.
- the light in the ultraviolet region emitted from the light emitting element is used for exciting the phosphor, the phosphor can be excited with high efficiency, and high-luminance light can be obtained from the phosphor.
- light in the visible region is emitted from the light emitting element, but such light is emitted outside without being absorbed by the phosphor. Therefore, light in the visible region emitted from the light emitting element can be used as external radiation without loss.
- FIG. 1 is a diagram showing a configuration of a white LED 1 according to an embodiment of the present invention.
- FIG. 2 is a diagram showing a configuration of the light emitting element 10 used in the LED 1.
- FIG. 3 is a graph showing a light emission spectrum of the light emitting element 10.
- FIG. 4 is a diagram showing a configuration of an optical element 60 used in a light emitting device according to another embodiment of the present invention. BEST MODE FOR CARRYING OUT THE INVENTION
- the light-emitting device of the present invention includes a light-emitting layer that is made of a Group III nitride-based compound semiconductor and emits light having an emission peak wavelength in an ultraviolet region and light having an emission peak wavelength in a visible region. That is, as for the emission wavelength, a light emitting layer having at least one emission peak in the ultraviolet region and one emission peak in the visible region is used. If the light-emitting layer satisfies such conditions, for example, a light-emitting layer having two or more light emission peaks in an ultraviolet region can be used, and a light-emitting layer having two or more light emission peaks in a visible region can be used. Monkey
- the light in the ultraviolet region needs to be light that can excite a phosphor described below.
- the light is a light having a wavelength capable of exciting the phosphor with high efficiency. Therefore, it is preferable to have an emission peak wavelength near the excitation wavelength of the phosphor, and it is more preferable to have a single emission peak wavelength near the excitation wavelength of the phosphor.
- the light in the visible region is emitted after being mixed with light emitted from a phosphor described later. That is, the light emitting device of the present invention can emit light of a color in which light in the visible region emitted from the light emitting layer of the light emitting element and light from the phosphor are mixed. Therefore, the color (wavelength) of light in the visible region can be appropriately selected in consideration of the color (wavelength) of light from the phosphor and the color of light emitted from the light emitting device. In other words, the emission color of the light emitting device can be changed by changing the color (wavelength) of light in the visible region.
- light in the visible region can have an emission peak wavelength in the range of 4300 nm to 5600 nm.
- the emission peak wavelength is 450 nn! It can be in the range of ⁇ 49 nm.
- the light in the visible region is blue light, and a light emitting device that emits white light can be configured by using a phosphor that emits yellow to yellow-green light as a phosphor described later.
- the light emitting layer is formed using a group III nitride compound semiconductor.
- a group III nitride compound semiconductor is represented by a general formula
- Some of the Group III elements may be replaced with boron (B), thallium (T 1), etc.
- part of nitrogen (N) may be replaced with phosphorus (P), arsenic (A s), antimony (S b ), Bismuth (B i), etc.
- the light emitting layer may contain an arbitrary dopant.
- a 1 xl G ato xl An area consisting of x2 I n x2 N (0 ⁇ xl ⁇ l, 0 ⁇ x 2 ⁇ 1 N x 1> x 2)
- Shall have an A 1 yl G a Bok over I n y2 N (0 rather yl rather 1, 0 ⁇ y 2 ⁇ 1 s y 1 ⁇ y 2) region composed of. Since the former region contains a large amount of A1 in its composition, the band gap is relatively large, and light in the ultraviolet region having a relatively short emission wavelength can be emitted. On the other hand, since the latter region contains a large amount of In in its composition, the band gap is relatively small, and light in the visible region having a long emission wavelength can be emitted. Both these regions are preferably formed in a single layer in a mixed crystal state.
- the light-emitting layer When the light-emitting layer is formed in a ternary system, it emits light in the visible region and a region composed of A 1 x G a! _ X N (0 ⁇ x ⁇ 1) that emits light in the ultraviolet region.
- a light emitting layer having a region consisting of In y G a — y N (0 ⁇ y ⁇ 1) can be employed. Also in this case, it is preferable to form both regions in a single layer in a mixed crystal state.
- the light emitting layer as described above can be formed by, for example, a metal organic chemical vapor deposition method (hereinafter, referred to as “MOCVD method”) as described in Examples below.
- MOCVD method metal organic chemical vapor deposition method
- an ammonia gas and an alkyl compound gas of a group III element are placed in a MOC VD apparatus heated to a predetermined temperature.
- MOC VD apparatus heated to a predetermined temperature.
- TMG trimethyl gallium
- TMA trimethyl aluminum
- TMI trimethyl indium
- Formation of light emitting layer By adjusting the long conditions, that is, the growth temperature, the flow rate of the ammonia gas, the ratio and the flow rate of the alkyl compound gas, the flow rate ratio of the ammonia gas and the alkyl compound gas, the growth rate, etc. Can be formed.
- Elemental source gas (TMG, TMA, TMI) 1 000: 1 to: L 00000: 1 range, growth temperature 600 ° C to 1100 ° C, growth rate 0.002 to 1 ⁇ mZ min by growing the light emitting layer in the range of, good a 1 crystallinity xl G a x _ xl _ x2 I n x 2 n (0 rather xl rather 1, 0 rather x 2 ° 1, x 1> x 2) and a l yl G a preparative vl - y 2 I n y 2 n (0 rather yl rather 1, 0 ⁇ y 2 ⁇ 1 y 1 ⁇ y 2) can be grown emitting layer composed of a mixed crystal of.
- the light emitting layer is grown with a range of 1 to 80,000: 1, a growth temperature of 700 to 900 ° C, and a growth rate of 0.01 to 0.1 im / min.
- a 1 xl G a — x2 In x 2 N (0 x xl x 1, 0 x x 2 x 1, x 1> x 2) is obtained by appropriately adjusting the growth conditions of the light emitting layer. It is possible to form light-emitting layers having different ratios of the region and the region consisting of A 1 y G a 1 yl _ y2 I n y2 N (0 x yl x 1, 0 ⁇ y 2 ⁇ 1 y 1 ⁇ y 2). it can.
- I n y G ai _ y N can form different light-emitting layers of the proportion of the region consisting of (0 ⁇ y ⁇ l).
- the layer configuration of the light emitting layer is not particularly limited, and a single quantum well structure, a multiple quantum well structure, or the like can be employed.
- the method of forming the light emitting layer is not limited to the MOCVD method, but includes a well-known molecular beam crystal growth method (MBE method), a halide vapor deposition method (HVPE method), a sputtering method, an ion plating method, an electron shower method, and the like. Can also be formed.
- MBE method molecular beam crystal growth method
- HVPE method halide vapor deposition method
- sputtering method an ion plating method
- an electron shower method and the like.
- the phosphor is excited by light in the ultraviolet region emitted from the light emitting element, and is different from the excitation light. It emits light of a certain wavelength. Therefore, any phosphor that can be excited by light in the ultraviolet region emitted from a luminescent element can be used as the phosphor in the present invention.
- Z n S C u, A l, (Z n, C d) S: Cu, A l, Z n S: C u, A u, A l, Y 2 S I_ ⁇ 5: T b, ( Z n, C d) S: Cu, Gd 2 ⁇ 2 S: Tb, Y 2 O 2 S: Tb, Y 3 A 15 O 12 : Ce, (Zn, C d) S: Ag, Zn S: A g, Cu, G a, C l, Y 3 A l 5 12 : Tb, Y 3 (A 1, G a) 5 ⁇ 12 : Tb, Zn 2 S i ⁇ 4 : Mn, L a P 0 4: C e, Tb, Y 2 0 3 S: Eu, YV_ ⁇ 4: Eu, Z n S: M ns Y 2 0 3: E u, Z n S: Ag, Z n S: A g ,
- a phosphor that emits light with high luminance when irradiated with excitation light emitted from a light emitting element is preferably used. Further, light emitted from the phosphor is mixed with light in the visible region emitted from the light emitting element and emitted externally. That is, the emission color of the phosphor is an element that determines the emission color of the entire light emitting device. Therefore, a phosphor having a luminescent color that can obtain a luminescent device of a desired luminescent color is selected. For example, when the visible light from the light emitting element is blue light, by using a phosphor having a yellow-yellow green light emission color, the light emitting device as a whole emits white light. Obtainable.
- ZnS Cu, A1s (Zn, Cd) S: Cu, Al, ZnS: Cu, Au, A l, Y 2 S I_ ⁇ 5: Tb, (Z n, C d) S: Cu, G d 2 ⁇ 2 S: Tb, Y 2 0 2 S: Tb, Y 3 A 1 5 ⁇ 12: C e , (Z n, C d) S: Ag, Z n S: A g, C u, G a, C l, Y 3 A l 5 ⁇ 12: Tb, Y 3 (A 1, G a) 5 0 12 : Tb, Z n 2 S I_ ⁇ 4: Mn, L a P0 4 : C e, it is possible to use T b, and the like.
- the phosphor may have an excitation wavelength for visible light emitted from the light emitting element.
- the visible light emitted from the light emitting element it emits light of a different wavelength from the excitation light
- a phosphor capable of emitting light (second phosphor) can be used in combination with the above phosphor. This makes it possible to correct the emission color of the light emitting device using the emission from the second phosphor.
- n-type GaN layer doped with n-type impurities such as Si, S, Se, Te, and Ge is irradiated with light in the ultraviolet region, yellow light is emitted.
- the emission color of the light emitting device of the present invention can be corrected using the emission obtained from the n-type GaN layer.
- high-luminance light emission can be obtained from the n-type GaN layer
- the above-mentioned phosphor is omitted by using such light emission, and light from the n-type GaN layer and light from the light-emitting element are emitted.
- Light emission of the light emitting device can also be obtained by mixing color with visible light.
- the above-mentioned phosphors can be used together.
- the phosphor is arranged in the light emission direction of the light emitting device.
- the phosphor is preferably used by being dispersed in a light transmitting material.
- the light emitting direction of the light emitting element is covered with a light transmitting material in which a phosphor is dispersed (hereinafter, referred to as “fluorescent material”).
- fluorescent material can be formed in a layer on the surface of the light emitting element.
- the cup portion may be filled with a fluorescent material.
- a fluorescent material can be used as the sealing member. That is, an element structure including a light emitting element may be sealed with a fluorescent material.
- epoxy resin silicone resin, urea resin, glass, or the like is used. These materials can be used alone or two or more arbitrarily selected from them can be used.
- the concentration distribution of the phosphor in the light transmissive material can be changed according to the purpose of use, conditions of use, and the like. That is, the amount of the phosphor is changed continuously or stepwise as it approaches the light emitting element. For example, the concentration of the phosphor is increased in a portion near the light emitting element. Thus, the phosphor can be efficiently irradiated with light from the light emitting element. By decreasing the concentration of the phosphor as the light emitting element is approached, deterioration of the phosphor due to heat generation of the light emitting element can be suppressed.
- a layer or space made of another light transmissive material may be provided between the fluorescent material and the light emitting element.
- the light from the light emitting element passes through the fluorescent material (the light in the ultraviolet region excites and emits the phosphor), and the light in the visible region from the light emitting element and the light from the phosphor Are automatically mixed in the fluorescent material.
- the mode of mixing the light in the visible region from the light emitting element and the light from the phosphor is not limited to this.
- phosphors are arranged in an island shape around the light emitting element. By irradiating the phosphor with ultraviolet light from the light emitting device and passing light in the visible region between the phosphor islands, light in the visible region from the light emitting device and light from the phosphor are emitted. Can be mixed in the sealing member.
- the phosphor and the light emitting element are integrally combined to form the light emitting device.
- the light emitting device may be configured with the phosphor separately from the light emitting element.
- a light emitting device can be formed by forming an LED using the light emitting element having the above-described configuration and combining it with a light transmitting material containing a phosphor (a light transmitting film or a cap containing a phosphor).
- the light emitting device of the present invention can be used alone as a light source that emits white light or the like. It can also be used for light-emitting diode display devices that display white with high density and high definition (hereinafter referred to as “LED display devices”).
- LED display devices In a conventional LED display device capable of full-color display, white light emission is obtained by combining each LED of R, G, and B to form one pixel, and emitting and mixing colors. In other words, three LEDs are required to emit light for white display, and the display area is larger than in the case of single-color light emission such as green and red. For this reason, it was not possible to display white with high definition as in the case of green and the like.
- white light emission can be realized by itself.By using the light emitting device in addition to each LED of RGB, a white display can be obtained with high density and high definition similarly to light emission of green and red. it can. Another advantage is that the white display can be adjusted by controlling the lighting state of one light emitting element.
- white display is not performed by mixing the emission colors of RGB LEDs as in the past, there is no change in the visible color depending on the viewing angle, and it is also possible to reduce color unevenness. it can.
- the white display by the mixed color of RGB and the white display by the light emitting device of the present invention are performed at the same time, thereby increasing the luminosity and luminance in the white display.
- LED light emitting device
- FIG. 1 is a diagram showing a white LED 1 according to one embodiment of the present invention
- FIG. 2 is a cross-sectional view of a light emitting element 10 used in an LED 1.
- composition Dopant
- Second n-type layer 14 n -A 1 G a N S i
- Substrate 11 The material of the substrate 11 is not particularly limited as long as it can grow a group III nitride compound semiconductor layer.
- a group III nitride compound semiconductor layer In addition to sapphire, spinel, silicon, silicon carbide, zinc oxide, gallium phosphide, gallium arsenide Gallium, magnesium oxide, manganese oxide, group III nitride compound semiconductor single crystal, or the like can be used.
- a sapphire substrate it is preferable to use the a-plane.
- the buffer layer 12 is used to grow a high-quality semiconductor layer, and is formed on the surface of the substrate 11 by a well-known M ⁇ CVD method or the like.
- a 1 N is buffered.
- Each semiconductor layer is formed by a well-known MOCVD method.
- ammonia gas and an alkyl compound gas of a group III element such as trimethyl gallium (TMG), trimethyl aluminum (TMA) and trimethyl indium (TM I) are heated to an appropriate temperature.
- TMG trimethyl gallium
- TMA trimethyl aluminum
- TM I trimethyl indium
- MBE molecular beam crystal growth
- HVPE halide vapor phase epitaxy
- sputtering ion plating, electron plating, etc. It can also be formed by a shower method or the like.
- the group III nitride-based compound semiconductor may contain any dopant. Si, Ge, Se, Te, C, and the like can be used as the n-type impurities. Mg, Zn, Be, Ca, Sr, Ba and the like can be used as the r> type impurities. After doping with a p-type impurity, the group III nitride-based compound semiconductor can be exposed to electron beam irradiation, plasma irradiation, or heating by a furnace.
- the layer 15 including the light emitting layer was formed as follows. First, the substrate temperature was set to 830 ° C, and TMG and ammonia gas were supplied into the MOCVD apparatus. Thus, a barrier layer (GaN) was formed. Subsequently, while maintaining the substrate temperature, the source gas was changed to ammonia gas, TMG, TMA, and TMI to form a quantum well layer (A 1 InGaN). By repeating the above operation a predetermined number of times, a layer 15 including a light-emitting layer in which a desired number of barrier layers and quantum well layers are stacked is obtained.
- the configuration of the light emitting element may be a single hetero type, a double hetero type, or a homojunction type.
- A1 X G a y I n X _ Y N (0 ⁇ X ⁇ 1, wide band gap doped with an acceptor such as magnesium between the layer 15 including the light emitting layer and the p-cladding layer 16 0 ⁇ Y ⁇ 1 N X + Y ⁇ 1) layer may be interposed. This is to prevent electrons injected into the layer 15 including the light emitting layer from diffusing into the ⁇ cladding layer 16.
- the ⁇ electrode 20 is composed of two layers, A 1 and V. After forming the p-contact layer 17, the p-contact layer 17; p-cladding layer 16, a layer 15 including a light emitting layer, and an n-cladding layer 14 , And a part of the n-contact layer 13 are removed by etching, and then formed on the n-contact layer 13 by evaporation.
- the translucent electrode 18 is a thin film containing gold, and is formed to cover substantially the entire upper surface of the p-contact layer 17.
- the electrode 19 is formed on the translucent electrode 18 by vapor deposition. After the above steps, a separation step for each chip is performed. The light emitting stadium of the obtained light emitting device 10 was measured.
- Figure 3 shows the measurement results at an applied voltage of 3.4 V and a forward current of 2 OmA. As shown in FIG. 3, two emission peaks are observed around a wavelength of 330 nm and around 470 nm.
- a reflective layer can be provided between the layer 15 including the light emitting layer and the substrate 11 or on the surface of the substrate 11 where the semiconductor layer is not formed.
- the reflective layer is made of a metal nitride such as titanium nitride, zirconium nitride, hafnium nitride, and tantalum nitride, A1, In, Cu, AgI, Pt, Ir, Pd, Rh, W, Mo, Ti. , Ni, or an alloy of two or more metals arbitrarily selected from these metals can be used as the material of the reflective layer.
- LED 1 was fabricated using light emitting element 10 as follows.
- the adhesive 22 is a silver paste in which silver is mixed as a filler in an epoxy resin. By using such a silver paste, heat dissipation from the light emitting element 10 is improved.
- the cup portion 33 is filled with an epoxy resin (hereinafter, referred to as “phosphor resin”) 35 in which phosphor 36 is uniformly dispersed. After the wire bonding of the phosphor resin The cup part 33 can be filled. Further, before the light emitting element 10 is mounted on the cup portion 33, a layer made of a phosphor resin may be formed on the surface of the light emitting element 10. For example, a phosphor resin layer is formed on the surface of the light emitting element 10 by dipping the light emitting element 10 into a phosphor resin, and then the light emitting element 10 is mounted on the cup portion 33 using silver paste. I do. As a method for forming the phosphor resin layer, sputtering, coating, coating, or the like can be used in addition to the above-described dip.
- the phosphor 36 ZnS: Cu, Au, A1 (P22_GY, manufactured by Kasei Optonitas Co., Ltd., emission peak 535 nm) was used.
- the epoxy resin is used as the base material for dispersing the phosphor 36, but the present invention is not limited to this, and a transparent material such as a silicon resin, a urea resin, or glass can be used.
- the phosphor 36 is uniformly dispersed in the phosphor resin 35.However, the concentration distribution of the phosphor 36 in the phosphor resin 35 may be inclined. You. For example, a plurality of phosphor resin layers having different phosphor concentrations are formed in the cup portion 33 by using epoxy resins having different phosphor concentrations. Further, the phosphor 36 concentration can be continuously changed.
- the phosphor resin 35 may contain a diffusing agent made of titanium oxide, titanium nitride, tantalum nitride, aluminum oxide, silicon oxide, barium titanate, or the like.
- a diffusing agent made of titanium oxide, titanium nitride, tantalum nitride, aluminum oxide, silicon oxide, barium titanate, or the like.
- the electrode 19 and the n-electrode 20 of the light-emitting element 10 are wire-bonded to the lead frames 31 and 30 by wires 41 and 40, respectively.
- the light emitting element 10, a part of the lead frames 30 and 31, and the wires 40 and 41 are sealed with a sealing resin 50 made of epoxy resin.
- the material of the sealing resin 50 is not particularly limited as long as it is transparent, but a silicone resin, a urea resin, or glass other than an epoxy resin is preferably used.
- adhesion with phosphor resin 35 From the viewpoint of the refractive index and the like, it is preferable to be formed of the same material as the material of the phosphor resin 35.
- the sealing resin 50 is provided for the purpose of protecting the element structure or the like, but a lens effect can be provided to the sealing resin 50 by changing the shape of the sealing resin 50 according to the purpose. .
- a round lens type or a convex lens type can be formed.
- the shape of the sealing resin 50 can be circular, oval, or rectangular when viewed from the light extraction direction (upward in FIG. 1).
- the phosphor 36 can be dispersed in the sealing resin 50 without being limited to the case where the phosphor resin 35 is omitted. Further, a phosphor different from the phosphor 36 is contained in the sealing resin, and the emission color of the LED 1 can be corrected and the emission color can be changed by using the emission of the phosphor.
- a diffusing agent can be included in the sealing resin 50.
- a diffusing agent titanium oxide, titanium nitride, tantalum nitride, aluminum oxide, silicon oxide, parium titanate, or the like is used.
- a coloring agent can be included in the sealing resin 50.
- the coloring agent is used to prevent the phosphor from exhibiting a specific color when the light emitting element 10 is turned on or off.
- the life can be improved by including an ultraviolet absorbent in the sealing resin 50.
- the phosphor 36, the diffusing agent, the colorant, and the ultraviolet absorber can be included in the encapsulating resin 50 alone, or two or more of them can be arbitrarily selected.
- another light emitting element can be used in combination.
- a light emitting element having a different emission wavelength from the light emitting element 10 is used.
- a light-emitting element having an emission wavelength that does not substantially excite and emit light from the phosphor is used.
- a light emitting device capable of emitting light of a color other than white light can be obtained. Further, the luminance can be increased by using a plurality of light emitting elements 10.
- FIG. 4 is a diagram schematically showing a configuration of a light emitting element 60 used in a light emitting device of another embodiment.
- the same elements as those of the light emitting element 10 are denoted by the same reference numerals, and the description thereof will be omitted.
- the specifications of each layer of the light emitting element 60 are as follows. Composition: Dopant
- Translucent electrode 1 8 An / C o
- Second n-type layer 14 n -A 1 G a N S i
- Reflective layer 70 Periodic structure
- reflective layer 7 0 S i n-type A 1 0 doped.
- X G a 0. 9 N or Ranaru first reflective layer 71 the A 1 from the first reflective layer 71 the composition is S i n-type a 1 0. 4 G a 0 de-loop.
- the second reflective layer 7 2 consisting of 6 n are alternately laminated rich in. At this time, it is known that the refractive index of the first reflective layer 71 is larger than the refractive index n 2 of the second reflective layer 72, and that n 1 > n 2 .
- the above configuration By providing the reflective layer, light generated in the layer 15 including the light emitting layer and in the ultraviolet region toward the n- contact layer 13 is reflected by the reflective layer 70.
- the n contact layer 13 absorbs a part of the light in the ultraviolet region having a wavelength of 360 nm or less, so that the phosphor cannot be efficiently irradiated with the light in the ultraviolet region.
- the provision of the reflective layer 70 prevents the light in the ultraviolet region from being absorbed by the n-contact layer 13 and also directs the light generated in the layer 15 including the light-emitting layer to the translucent electrode 18 By reflecting the light in the direction, it is possible to efficiently irradiate the phosphor arranged in the direction with light in the ultraviolet region. Therefore, high-luminance light is obtained from the phosphor, and a light-emitting device with high luminous efficiency is provided.
- a 1 X G a (0 ⁇ x ⁇ 1) was used for the material of the reflective layer 70, but as a general formula, A 1 X G a y I n to x — y N (0 ⁇ x ⁇ 1 s 0 ⁇ y ⁇ 1 s 0 ⁇ x + y ⁇ l)
- S x G ei _ x C (0 ⁇ x ⁇ 1)
- a l xG ay li ⁇ - x one ⁇ 3 _ z (0 ⁇ x ⁇ 1 , 0 ⁇ y ⁇ 1, 0 ⁇ z ⁇ 1,
- Semiconductors such as 0 ⁇ x + y ⁇ 1), metal nitrides such as titanium nitride, zirconium nitride, hafnium nit
- the present application also discloses the following matters.
- a light-emitting element comprising a group III nitride-based compound semiconductor and having a light-emitting layer that emits light in the ultraviolet region and light in the visible region with a light emission peak wavelength.
- the emission peak wavelength of the light in the ultraviolet region can be set to 360 nm or less.
- the emission peak wavelength of light in the visible region is in the range of 430 nm to 560 nm or 450 ⁇ ! It can be set in the range of 490490 nm.
- the region consisting of n y 2 N (0 ⁇ y 1 ⁇ 1, 0 ⁇ y 2 ⁇ 1, y 1 ⁇ y 2) can be formed in a single layer.
- the light-emitting layer is composed of a region consisting of A 1 X G a! _ X N (0 ⁇ x ⁇ 1) that emits light in the ultraviolet region, and In y G ai _ y N ( A region having a region of 0 ⁇ y ⁇ 1) can be adopted.
- the region consisting of A 1 X G a! _ X N (0 ⁇ x ⁇ 1) and the region consisting of In y G ai — y N (0 ⁇ y ⁇ 1) are in a single layer. Can be formed.
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
KR1020037009212A KR100638294B1 (ko) | 2001-01-10 | 2002-01-04 | 발광 장치 |
EP02715705A EP1357609A4 (en) | 2001-01-10 | 2002-01-04 | LIGHT EMITTING DEVICE |
US10/250,772 US6891203B2 (en) | 2001-01-10 | 2002-01-04 | Light emitting device |
Applications Claiming Priority (4)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP2001003104 | 2001-01-10 | ||
JP2001-3104 | 2001-01-10 | ||
JP2001-352376 | 2001-11-16 | ||
JP2001352376A JP2002280607A (ja) | 2001-01-10 | 2001-11-16 | 発光装置 |
Publications (1)
Publication Number | Publication Date |
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WO2002056391A1 true WO2002056391A1 (fr) | 2002-07-18 |
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ID=26607492
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/JP2002/000003 WO2002056391A1 (fr) | 2001-01-10 | 2002-01-04 | Dispositif electroluminescent |
Country Status (7)
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US (1) | US6891203B2 (ja) |
EP (1) | EP1357609A4 (ja) |
JP (1) | JP2002280607A (ja) |
KR (1) | KR100638294B1 (ja) |
CN (1) | CN1224114C (ja) |
TW (1) | TW507388B (ja) |
WO (1) | WO2002056391A1 (ja) |
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Also Published As
Publication number | Publication date |
---|---|
JP2002280607A (ja) | 2002-09-27 |
EP1357609A1 (en) | 2003-10-29 |
CN1224114C (zh) | 2005-10-19 |
KR100638294B1 (ko) | 2006-10-26 |
US6891203B2 (en) | 2005-05-10 |
KR20030071805A (ko) | 2003-09-06 |
EP1357609A4 (en) | 2006-11-08 |
TW507388B (en) | 2002-10-21 |
CN1484864A (zh) | 2004-03-24 |
US20040061115A1 (en) | 2004-04-01 |
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