H - Electricity – 01 – J
Patent
H - Electricity
01
J
H01J 1/63 (2006.01) C09K 11/58 (2006.01) C09K 11/88 (2006.01) H01J 63/04 (2006.01) H05B 33/14 (2006.01)
Patent
CA 2062750
2062750 9116722 PCTABS00008 A mixture of predominantly zinc sulfide and minor amounts of a copper activator compound and fluxing agents is first-fired at about 1200 ·C to form particles of a hexagonal crystalline structure. The first-fired mixture is mortared or otherwise mechanically stressed for variable periods of time beyond its maximum brightness stress period. This material is fired a second time at about 750 ·C and cooled to produce the phosphor powder. A number of electroluminescent test lamps (Fig. 1) were made incorporating the various experimental phosphors (30) and each of the different mortaring times. For each phosphor made, the brightness rose, peaked and decreased as mortaring time increased (35), but the life characteristic remained a positive function of mortaring time for a substantially longer time than did the brightness (36). An excellent combination of brightness and life is obtained by mortaring beyond the time required for maximum brightness.
Faria Sixdeniel
Loctite Luminescent Systems Inc.
Smart & Biggar
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