F - Mech Eng,Light,Heat,Weapons – 21 – K
Patent
F - Mech Eng,Light,Heat,Weapons
21
K
31/126
F21K 2/00 (2006.01) C09K 11/77 (2006.01)
Patent
CA 1081938
ABSTRACT OF THE DISCLOSURE: A cerium-activated yttriumaluminate phosphor such as YAlO3:Ce featuring an enhanced luminous intensity is produced by (a) preparing a mixture of Y2O3, Al2O3 and CeF3, in which the quantity of CeF3 is such that the cerium in the phosphor amounts to 0.1 to 5 mol % of the yttriumaluminate; (b) adding a barium compound selected from the group consisting of BaO, BaCO3, BaF2, BaCl2, Ba(NO3)2, Ba(OH)2 and BaC2O4 to the mixture, in an amount of 0.001 to 20 mol % of the yttrium- aluminate; (c) baking the resulting mixture at a temperature in the range from about 1000 to about 1400°C; and (d) washing the product of step (c) with nitric acid when the amount of the barium compound is larger than 8 mol % of the yttriumaluminate. The phosphor thus obtained features not only a high luminous intensity but also a short decay time, and is particularly suitable for use in flying-spot scanner tubes and color image receiving tubes of the index type.
254728
Miyata Takeo
Muramatsu Fumio
Takeda Takeshi
Tomiki Tetsuhiko
Matsushita Electric Industrial Co. Ltd.
Robic Robic & Associes/associates
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