A phosphor layer 12 is composed of tri-band phosphor particles 12a bound together by a binder 12a. A material as the main component of the binder 12b is a mixture of (1) a compound formed by calcium oxide, barium oxide, and boron oxide, and (2) calcium pyrophosphate. Dissolved in the main component material...http://www.google.com/patents/US20030181308?utm_source=gb-gplus-sharePatent US20030181308 - Glass composition, protective-layer composition, binder composition, and lamp
