CA1141498A - Organic electroluminescent cell - Google Patents

Organic electroluminescent cell

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Publication number
CA1141498A
CA1141498A CA000361376A CA361376A CA1141498A CA 1141498 A CA1141498 A CA 1141498A CA 000361376 A CA000361376 A CA 000361376A CA 361376 A CA361376 A CA 361376A CA 1141498 A CA1141498 A CA 1141498A
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CA
Canada
Prior art keywords
cell
zone
luminescent
agent
layer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired
Application number
CA000361376A
Other languages
French (fr)
Inventor
Ching W. Tang
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Eastman Kodak Co
Original Assignee
Eastman Kodak Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Eastman Kodak Co filed Critical Eastman Kodak Co
Application granted granted Critical
Publication of CA1141498A publication Critical patent/CA1141498A/en
Expired legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/17—Carrier injection layers
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/14—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the electroluminescent material, or by the simultaneous addition of the electroluminescent material in or onto the light source
    • H—ELECTRICITY
    • H05—ELECTRIC TECHNIQUES NOT OTHERWISE PROVIDED FOR
    • H05B—ELECTRIC HEATING; ELECTRIC LIGHT SOURCES NOT OTHERWISE PROVIDED FOR; CIRCUIT ARRANGEMENTS FOR ELECTRIC LIGHT SOURCES, IN GENERAL
    • H05B33/00—Electroluminescent light sources
    • H05B33/12—Light sources with substantially two-dimensional radiating surfaces
    • H05B33/20—Light sources with substantially two-dimensional radiating surfaces characterised by the chemical or physical composition or the arrangement of the material in which the electroluminescent material is embedded
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K50/00—Organic light-emitting devices
    • H10K50/10—OLEDs or polymer light-emitting diodes [PLED]
    • H10K50/11—OLEDs or polymer light-emitting diodes [PLED] characterised by the electroluminescent [EL] layers
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/30—Coordination compounds
    • H10K85/311—Phthalocyanine
    • H—ELECTRICITY
    • H10—SEMICONDUCTOR DEVICES; ELECTRIC SOLID-STATE DEVICES NOT OTHERWISE PROVIDED FOR
    • H10K—ORGANIC ELECTRIC SOLID-STATE DEVICES
    • H10K85/00—Organic materials used in the body or electrodes of devices covered by this subclass
    • H10K85/60—Organic compounds having low molecular weight
    • H10K85/615—Polycyclic condensed aromatic hydrocarbons, e.g. anthracene
    • H10K85/621—Aromatic anhydride or imide compounds, e.g. perylene tetra-carboxylic dianhydride or perylene tetracarboxylic di-imide

Abstract

ORGANIC ELECTROLUMINESCENT CELL
Abstract An organic electroluminescent cell is disclosed com-prising a luminescent zone between two electrodes, wherein a hole-injecting zone comprising a porphyrinic compound is dis-posed between the luminescent zone and the anode electrode.

Description

-1 , ORGANIC ELECTROLUMINESC~NT CELL
1) Field of the Invention This invention rel~tes to org~nic electroluminescen~
cells, ~hat i6, devices tha~ generste light in re~pon6e to ~n electrical ~ignal and are con6tructed U8i~g organic compounds as the light-generating means.
2) Back~round of the Inven~ion Organic electroluminescent cell~ have been con-~tructed from a laminate of an organic luminescent ~gent and electrodes of opposite polarity, one of the electrode~
serving as an electron injector ~nd the other 3S ~ hole injector. Such cells have included ~ingle cryst~l msterial~, such as single crystal anthracene, as a lu~inescent agent ~s de~cribed for example in U.S. Patent No. 3,530,325. However, single crystals present the dissdvantages that 8), they are expensive to manufacture and b), they cannot easily be reduced in thickness below 50 microns, hereinafter "~". It is important that thin film devices be obtainable, as cell~
of thicknesses much larger than 1~ frequently require excitation voltages on the order of 100 volts or greater for light output of about 1 ft-lambert or more.
At~empts to obtain a coatin~ of lumine~cent agent6 ~uch as anthracene at 1 micron or less have resulted in the formation of pinholes. These pinhole6 act A~ shorts be-2~ tween the electrodes, and no luminescence is produced.Although non-conductive polymeric binders can be added, usually as ~olid solvents, to pr~vide pinhole free film, ~nd to create a luminescent zone of the desired thickness, the b~nders tend to interfere with the injection of holes and
3~ electrons at the electrodes. To prevent the 6horting, the binders preferably are polymeric insulator~ and have a breakdown field strength of ~t least about 105 volt/cm.
However, such insulating binders necessarily tend to resi~t hole injection and/or electron injection from the metallic electrodes. Workers in the art have, ~ccordin~ly, been avoiding the problem by using cell ehicknesses that are greater than are otherwise desired. Because greater thick nesses require greater excitation voltages for a given light output, the efficiencies are reduced.
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SUMMARY OF THE_INVENTION
In ~ccordance with the present inven~ion the~e i6 advantageously featured an electroluminescent cell th~t i8 hIghly efficient.
It i5 a related feature of the cell of the inventlon that it i6 highly lu~inescent ~t low power conditions, e.g., at voltages no greater than ~bout 20 volt~, current den~itie~
no greater than about 1 amp/cm2, and at roo~ temper~ture.
The aforesaid features of the invention sre Ychieved by means of an improved cell including an ~node electrode, cathode electrode, ~nd a luminescent zone between ~he elec-trodes, the luminescent zone comprising an organic lumines-cent agent and a binder having a breakdown field ~trength of at least about 105 volt/cm. The improvement resides in the use of a hole injecting zone compri~ing ~ layer of ~ por~
phyrinic compound between the luminescent zone and the anode electrode.
Other features of the invention will become apparent upon reference to the following Description of the Preferred Embodiments when read in light of the attached drawing.
BRIEF DESCRIPTION OF THE DR~WING
_ _ The drawing is a partially 6chematic section view of a cell of the invention connected to ~ power ~ource.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
25This invention is used to advantage to provide ~n electroluminescent cell requiring a relatively low voltage.
This in turn is due to the very thin nature of the l~mines-cent zone. The thin zone iB feasible p~rtly bec~u~e ~ binder i~ incorporated with the luminescent agent of the lumine~cent 3 zone. Preferably the zone'~ thicknes~ do@s not exceed about 1 micron, measured in the direction of ~urrent flow through the zone.
In ~ddition, th~ invention can be used wi~h any lum-inescent zone provided with a non-conductive binder, even those whose thicknesses are signiicantly larger than 1 micron.
The invention derives from the ~iscovery that the current inhibiting effect of the binder is overcome by placing a particular hole-injecting zone between the lum~nes~
cent zone containing the binder, ~nd the ~node electrode. As a result, neither of the electrodes need be e6pecially reac-tive. Specifically, porphyrinic compound's have been found to provide hole-injection sufficient to overcome ~he re8i5tance of the binder, even when conventional msterial6 ~re u~ed ~6 the anode and cathode electrodes.
The luminescence i~ genera~ed primarily by the lu~-inescent agent~ As used herein, the lumine~cent agent iB ~ny material that radiates li~ht due to the decay of an excited ~tate created by the recombination of electron-hole pai~.
Preferably, ~he material has a total emi6sion quantum yield of at least about 0.1%.
Any organic luminescent agent i~ ~eful in the lum-inescent zone of the cell of the inventionO Adv~ntageously,the luminescent agent i6 one that relies upon the presencc of a binder to prevent pinholing. Most preferred examples of useful lum;ne~cent agents include aromatic eompounds such ~5 anthracene, naphthalene, phenanthrene, pyrene, chrysene and perylene; butadienes fiuch ~s 1,4-diphenylbutadiene ~nd tetra-phenylbutadiene; coumarins; acridine; Rtilbene~ such as transtilbene; and any other luminescent ~gent h~ving ~ fused ring structure of less than 8 rings.
A wide variety of binders i~ useful wi~h the lum-inescent agent to prevent pinholing, provided they h~ve ~fiufficient breakdown field strength as noted ~bove ~nd GUf-ficient film-forming characteristic~. Although preferred ~re polymeric binders that act as solid solvents ~ other binders are useful in admixture with the luminescent agent, e.g., a6 3 described in U.S. Pafent Mo. 3,621,321.
Of the ~olvent binders, thc following are represent-ative polymer~ found to be highly useful: ~ddition polymer~
~uch ~s polystyrene or poly(p~t-butylstyrene) having ~
breakdown field ~treng~h of about 2 X 106 ~olt/cm, poly-(vinyl carbazole), poly(vinyltoluene), poly(methyl meth-acrylate), poly~acrylonitrile) copolymers snd poly~vinyl ~cetste); and condensation polymers ~uch 3S polyesters, polycarbonates, polyimides and polysulfones.

Any form of luminescent zone is useful in the cell.
Preferred is a layer format, the other zones and materials of the cell being foxmed also as layers in a laminate.
As is conventional, the anode electrode is prefer-ably a transparent insulative layer coated with a layer of at least parially transparent conductive matexial, e.g., tin oxide, indium oxide and indium tin oxide. Thus, the light emitted by the luminescent zone is transmitted through the anode. Alternatively, the anode is opaque, provided that if the cathode is also opaque then the luminescent zone is itself transparent at its edges. In yet another embodiment, a semitransparent cathode is used, the light being viewed through such cathode.
Preferred examples of anodés include glass coated with a semitransparent layer of indium tin oxide, tin oxide or nickel, e.g., coated glass available under trademarks NesaTM amd NesatronTM from PPG Industries having a sheet resistance of about 10 to 50 ohms/square and an optical transmittance of about 80 percent for visible light.
In accordance with one aspect of the invention, a hole-injecting zone is disposed between the luminescent zone and the anode, the hole-injecting zone comprising a por-phyrinic compound. As used herein, a porphyrinic compound is any compound, natural or synthetic which derives from or in-cludes the basic porphyrin structure, including porphyrin itself. Examples oE such are disclosed in the aforesaid U.S.
Patent 3,935,031. A currently preferred class of such compound is the class having the structure ~r ~:
. ! j .

' .
~ "

.' :

-4a-Xl-~ zl ,~2 ( I ) ~ = ~
X~ Tl ~Q \ / Q~ \ ,~T ~ f z 1 li ,N M N ~ ll z 1 ~2 6 ¦ T X2 \ _ /

X I_ _z 1 _ I X

wherein:
Q is -N- or =CH-;
M i~ a metal;
Tl and T2 are both S or both C, or one of Tl ~nd T2 i6 N and the other is C;
xl and x2 are the 6ame or different, ~nd are each hydrog-en or halogen, such ~s chlorine, fluorine ~nd bromine; and zl represents the atom~ necessary to form a ~ix-membered unsaturated ring.
A further option is to modify the compounds of structure (I), to provide a non-metsllic complex wherein two of the four nitro~ens are hydro~enated.
Mighly preferred examples of useful porphyrins sre metal-free phthalocyanines and the ~et~l phthalocyanines 1~ wherein M of structure (I) is any me~al such a~ cobalt, mag-nesium, zinc, palladium, nickel, ~nd particularly copper, lead, or platinu~.
Useful cathode electrodes include those formed from common metals with a low-work function, such as indium, 2~ silver, tin, aluminum or the like, whether semitran~parent or opaque. Importantly, the cathode need not be selected from highly reactive alkali metal6 which require protection against accidental oxidation.
The Figure illustrate6 ~n electrolumine~cent cell 10 prepared in accordance with the invention. It compriGe~ an anode electrode 12 formed ~s a layer of gla~6 14 coated with a semitransp~rent coating 16 of indium tin oxide, on which i~
deposited a layer 18 of ~ porphyrinic compound. A layer ~0 of a lu~inescent agent and 8 binder i8 deposited on layer 18 3 over which is deposited a cathode electrode 22. Lead linez 24 are connected to ~ voltage source ~V~ 26 in 3 conven-tional manner. Source 26 is a D.C. or A.C. 60urce, and pref erably includes conventional circuitry that deliver6 2 ~tep or pulsed signalO For example, the cell of the invention provides a fast-time re~ponse of about 1 to 10 microseconds to a pulsed 6ignal.
Alternatively, the cell of the invention can include a second lu~inescent ~gent in the luminescent zone, pref-erably as ~ second layer, not ~ho~n, between the cathode electrode ~nd the layer containing the binder and the first luminescent agent, to cau~e a 6hifting of ~he emitted llghE
5 to other wavelengths. Preferably ~uch ~econd lumine~cent agent is organic and i8 different from the lumine~cent ~gent provided with the binder.
Alternatively, both lumine~cent agent~ can be ~d-mixed in one layer if they are both soluble in the binder.
In yet another alternate embodiment of the inven-tion, the zones of the cell are arran~ed ~ide-by-side as parts of a ~ingle layer on ~n insulative ~ubs~rate. In such an embodiment, the two electrodes constitute the tWQ opposite end portions of the layer. To prevent the voltage load from being exeessive, the width of the luminescent zone mea~ured from the hole-i~jecting zone to the cathode preferablg would be as described above, that is no larger than about 1 micron.
Such a cell constructed from the ~aterisls described above has been found to produce luminescence with markedly superior efficiencies. That is, a ~ource 26 with a volta~e no greater than 20 volts and a room temperature current dens-ity of no more than 1 amp/cm2 produce& in cell 10 ~ l~m-inosity of at least 0.5 ft-lamberts.
Any ~uitable coating technique i~ u~eful to manu-facture the afore-descri~ed cell. For example, onç preferred coating technique features coating the layers from different ~olvents, one upon the other, the solvent of ~ne layer being a poor ~olvent for the other. The currently preferred method is to vapor deposit the porphyrinic layer on a clean, i.e., 3 polished, anode electrode, using 60urces of porphyrinic eom-pounds which ~re reasonably free of decomposable or volatile materials, and thereafter ~olvent coat the lumine~cent l~yer as by ~pin coating at between about 1,000 and about 10,000 rpm from one or more of the following solvents: 1,2-di-- 35 chloroethane, dichloromethane, ~nd mixtures of the two, tolu-ene! xylene, and te~rahydrofuran. Another useful method is to deposit the lum;nescent ~nd hole-injecting zones ~y vapor depo~ition. The cathode electrode also can be applied by conventional vapor deposition~
A currently preferred procegs for polishing the Nesatron~ glas~, if used as the ~node eleetrode, c~mprises rubbing the Neeatron~ ~urface with ~ cotton fl~nnel wetted with a suspension of an alumina or other ~brasive, uually for a few minutes. The polished Ne~atron~ gla~6 i~ then ~onicated in a 1:1 H20/iBopsopyl alcohol bath for ~bout half an hour to remove the abrasive particles, ~nd then rinsed thoroughly with distilled w~ter. The polished ~ Ne6atron~ ~lass ~ppear~ relatively elean in a ~trong light.
EXAMPLES
The following exa~ple~ further illustrate the nature of the invention.
Example 1 1~ A cell was prepared as a lamin~te of Nesatron and copper phthalocyanine, hereinafter, CuPc, flt a thickne~ of about 1000 A. A layer of tetraphenylbutadiene in poly-styrene was applied over the CuPc, ~lso at about 1000 A.
Finally, a layer of Ag was spplied, a6 follows: (1) the CuPc 2~ thin film was deposited on the cleaned Ne~atron by vacuum deposition. (2) Tetraphenylbutadiene in poly6tyrene (weight ratio 1:4) was cast on top of tbe CuPc by 6pin coating at a speed of 10,000 rpm. The ~olution used for thi6 spin co~ting co~tained 25 mg solid~ di~solved in 1 mL toluene. The thick-2~ ness of the re~ulting film wa5 ~bout 1000 A. (3) A Agelectrode was applied on top of the tetraphenylbutadiene/-polystyrene film by vapor deposition in vacuum.
The two-layer cell gave blue light when it was excited by 20 V, and an average current density of 3 30-40mA/cm2. The brightne6s of the eell was ~bout 1.5 ft lambert and the peak emiseion was at 467 nm.
By contrast, the &~me cell ~ith~ut the CuPc layer, nsmely Nesatron/~tetraphenylbutadiene/poly~tyrene) (~1000-~000 A)lAg, either did not emit light a~ ~ 20 V
bias, or the cell suffered from electrical arcing ~t 20V or higher voltages with some ~eak white light emis~ion at localized spots, indica~ing a breskdown phenomenon.

A cell was construeted a~ Ne~atron/CuPc/(tetra-phenylbutadiene/poly8tyrene)/PV-H/Ag, where PV-H i~

I ~ ~ ol ' The preparation of CuPc/tetraphenylbu~diene film on Nesatron w~s as described in Ex~ple 1. PV-H (-500-1000 1) was evaporated on top of the tetraphenylbutadiene/polystyrene film. The light emitted by thi~ c~ll was no~ 31mo6t eom-pletely shifted to the near infrared at 810 nm, which was attributed to the emis6ion of the PV-H film.
Example 3 A cell was prepared comprising ~ first l~yer (-1000 A) of CuPc and a second layer ~-1000 ~) of tetraphenylbutadiene in 8 poly(p-t-butylstyrene) polymer binder (weight ratio 1:4). The two layers were ~andwiched between ~ Nesatron~ anode electrode (adjacent to the CuPc layer) and an evaporated ~ilver electrode. Upon excita~ion by a DC voltage source of 28 volts ~nd 6 mA/cm2, ~ blue emission of brightness of about 6 ft-la~bert was observed.
Example 4 A cell of 8 configur~tion ~imilar to ~xample 3 was prepared except that the polymer binder was ~ bi6phenol-A
polyc~rbonate. Upon excitation by ~ ~C voltage ~urce of 36 volts and ~bout 25 mA/cm2, a blue emission of about 2 ft-lambert was observed.
~ E~
A cell of a confi~ur~tion ~imilar to ~xample 3 was prepared except that the polymer binder was poly(vinyl- :
toluene~. Upon excitation by 8 DC voltage 60urce ~f 30 ~olt~
~nd 100 mA/cm2, a blue emission of 50 ft lambert was ob~erved.
Example 6 A eell of ~ configuration similar to Example 3 was prepared excep~ ~hat the polymer binder was poly(~crylo-nitrile-co-styrene). Upon excitstion by a DC volt~ge ~ource of 30 volts and 10 mA~cm2 a blue emis~ion of brlghtne~
about 2.5 ft-lambert was observed.
Example 7 A cell of configur~tion ~i~ilar to that of Example 3 w~s prepared except that the lumine6cent l~yer was tetra-phenylethylenetpoly~yrene (weight r~tio 1~4). Upon excit~-tion by a DC volta~e ~ource of 26 volt~ ~nd 180 mA/cm , blue-green emission of brightness of ~bout 18 ft-lambert wa~
ob~;erved.
Example 8 A cell of configur~tion 6imilar to that of Ex~mple 3 was prepared except that the phthalocyanine layer was metal-free phthalocyanine ~~1208 A) and the luminescent l~yer was -1000 A of 7-diethylamino-4-methylcoumarin in a poly-~tyrene matrix (weight ratio 1:6). Upon excitation by a pulsed voltage of 40 volts, 10% duty cycle snd peak current density of about 10 mA/cm2, a purple-blue emission of brightness about 3 ft-lambert was observed.
The invention has been described in detail with par-ticular reference to preferred embodiments thereof, but it will be understood that variations and modification~ can be effected within the ~pirit ~nd ~cope of the invention.

, : ' '

Claims (5)

What is claimed is:
1. In an electroluminescent cell including an anode electrode, a cathode electrode, and a luminescent zone be-tween said electrodes comprising an organic luminescent agent and a binder having a breakdown field strength of at least about 105 volt/cm, the improvement comprising, between said luminescent zone and said anode electrode, a hole-injecting zone com-prising a layer of a porphyrinic compound.
2. A cell as defined in claim 1, wherein said por-phyrinic compound is a phthalocyanine.
3. A cell as defined in claim 1, wherein said por-phyrinic compound is a metal phthalocyanine.
4. A cell as defined in claim 1, 2 or 3, wherein said binder is a polymeric solvent for said luminescent agent.
5. A cell as defined in claim 1, wherein said lum-inescent zone include a second luminescent agent different from said organic luminescent agent, said second agent being capable of shifting the wavelength of the light emission from that of the first luminescent agent.
CA000361376A 1980-07-17 1980-10-02 Organic electroluminescent cell Expired CA1141498A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US169,705 1980-07-17
US06/169,705 US4356429A (en) 1980-07-17 1980-07-17 Organic electroluminescent cell

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EP (1) EP0044686A1 (en)
JP (1) JPS5751781A (en)
CA (1) CA1141498A (en)

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