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Improvement on the linearity of blue phosphor: Evaluation of hexagonal ZnS:Ag,Al
Author(s) -
Toyama Hisashi,
Matsukiyo Hidetsugu,
Shiiki Masatoshi,
Komatsu Masaaki
Publication year - 1996
Publication title -
journal of the society for information display
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.578
H-Index - 52
eISSN - 1938-3657
pISSN - 1071-0922
DOI - 10.1889/1.1985017
Subject(s) - phosphor , materials science , hexagonal crystal system , thermoluminescence , analytical chemistry (journal) , zinc , luminescence , optoelectronics , crystallography , chemistry , metallurgy , chromatography
— ZnS:Ag,Al phosphors were prepared in an H 2 S flow without using flux at various temperatures. A cubic structure (a zinc‐blende structure) was obtained for the sample prepared at 900°C, and a hexagonal structure (a wurzite structure) was obtained at 1050–1200°C. The life was improved simply with increasing preparation temperature. The luminous efficacy and the current coefficient had their optimum temperature at 1050°C. They showed similar tendencies related to the preparation temperature. The diffuse reflectance also showed the similar tendency of the preparation temperature dependence. The thermoluminescence measurement showed that the traps at a depths of 1.3 eV (observed below 1050°C) and 1.15 eV (observed above 1050°C) disappeared at a preparation temperature of 1050°C.