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Gallium‐rich CaGa α S β :Ce as a new blue electroluminescent phosphor
Author(s) -
Kato A.,
Katayama M.,
Mizutani A.,
Ito N.,
Hattori T.
Publication year - 1998
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 - 10.1889/1.1985196
Subject(s) - phosphor , electroluminescence , materials science , gallium , caga , chemical vapor deposition , annealing (glass) , luminance , optoelectronics , analytical chemistry (journal) , optics , chemistry , physics , nanotechnology , layer (electronics) , biochemistry , chromatography , virulence , metallurgy , composite material , gene
— Ga‐rich CaGa α S β : Ce thin films, of which the Ga/Ca ratio was 2.5–4, were grown by metalorganic chemical vapor deposition. After post‐annealing at 650°C, a new substance, different from the ordinary CaGa 2 S 4 , grew. This was confirmed by XRD and by a spectral shift of the Ce 3+ emission. This phosphor was found not only to emit a deeper blue, ( x , y ) = (0.15, 0.16), than CaGa 2 S 4 : Ce, ( x , y ) = (0.15, 0.19), but also to be electroluminescent. Its luminance was 2 cd/m 2 at 40 V above threshold at a frame frequency of 120 Hz.