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Inorganic EL devices with high‐performance blue phosphor and application to 34‐in. flat‐panel televisions
Author(s) -
Hamada Hiroki,
Yoshida Isao,
Carkner Don,
Wu Xingwei,
Kutsukake Masaki,
Oda Kumpei
Publication year - 2008
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/jsid16.12.1183
Subject(s) - phosphor , gamut , luminance , materials science , ntsc , optics , color gel , optoelectronics , electroluminescence , crts , viewing angle , transmittance , contrast ratio , layer (electronics) , high definition television , computer science , liquid crystal display , telecommunications , computer graphics (images) , physics , composite material , thin film transistor
— A high‐performance inorganic electroluminescence (EL) device has been successfully developed by using an EL structure with a thick dielectric layer (TDEL) and sputtered BaAl 2 S 4 :Eu blue phosphor. The luminance and efficacy were higher than 2300 cd/m 2 and 2.5 lm/W at L 60 , 120 Hz, respectively. Furthermore, the luminance at L 60 , 1.2 kHz was more than 23,000 cd/m 2 . The phosphor layer has a single‐phase and a highly oriented crystalline structure. The phosphor also shows high stability in air. A 34‐in. high‐definition television (HDTV) has been developed by combining a TDEL structure and color‐conversion materials. The panels with an optimized color filter demonstrated a peak luminance of 350 cd/m 2 , a color gamut of more than 100% NTSC, and a wide viewing angle similar to that of plasma‐display panels. The high reproducibility of the 34‐in. panels using our pilot line has been confirmed.