Blue light emitting thiogallate phosphor
AssigneeThe Regents of the University of California
InventorsRobert C. Dye, David C. Smith, Christopher N. King, Richard T. Tuenge
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Abstract
A crystalline blue emitting thiogallate phosphor of the formula RGa.sub.2 S.sub.4 :Ce.sub.x where R is selected from the group consisting of calcium, strontium, barium and zinc, and x is from about 1 to 10 atomic percent, the phosphor characterized as having a crystalline microstructure on the size order of from about 100 .ANG. to about 10,000 .ANG. is provided together with a process of preparing a crystalline blue emitting thiogallate phosphor by depositing on a substrate by CVD and resultant thin film electroluminescent devices including a layer of such deposited phosphor on an ordinary glass substrate.
Claims6
A process for preparation of a crystalline blue emitting thiogallate phosphor of the formula RGa.sub.2 S.sub.4 :Ce.sub.x where R is selected from the group consisting of calcium, strontium, barium, zinc and mixtures thereof, and x is from about 1 to 10 atomic percent, said process comprising:
- forming a gaseous mixture of a sulfur source and metallo-organic precursors, said metallo-organic precursors containing at least one of the metals R, Ga, and Ce and said metallo-organic precursors present in stoichiometric amounts sufficient to yield said thiogallate phosphor;
- and,
- exposing said gaseous mixture to a substrate at a temperature sufficiently high to deposit from said gaseous mixture a layer of said thiogallate phosphor having a crystalline microstructure.
Dependencies are inferred from the claim text.