Premium
High‐performance white OLEDs with high color‐rendering index for next‐generation solid‐state lighting
Author(s) -
Komoda Takuya,
Ide Nobuhiro,
Varutt Kittichungchit,
Yamae Kazuyuki,
Tsuji Hiroya,
Matsuhisa Yuko
Publication year - 2011
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/jsid19.11.838
Subject(s) - oled , chromaticity , materials science , color rendering index , luminous efficacy , luminance , optoelectronics , color temperature , optics , phosphorescence , high color , brightness , white light , fluorescence , physics , computer science , image (mathematics) , layer (electronics) , artificial intelligence , color image , composite material , image processing
— Several white‐OLED structures with a high color‐rendering index (CRI) were investigated for lighting applications. A two‐unit fluorescent/phosphorescent hybrid white OLED achieved an excellent CRI of 95, high luminous efficacy of 37 lm/W, and long lifetime of over 40,000 hours at 1000 cd/m 2 . White‐OLED lighting panels of 8 × 8 cm for high‐luminance operation were fabricated, and a stable emission at 3000 cd/m 2 was confirmed. Quite a small variation in chromaticity in a different directions was achieved by using an optimized optical device structure. With a light‐outcoupling substrate, a higher efficacy of 56 lm/W, high CRI of 91, and longer half‐decay lifetime of over 150,000 hours at 1000 cd/m 2 was achieved. All‐phosphorescent white OLEDs placed on the light‐outcoupling substrate show a high CRI of 85 and higher efficacy of 65 lm/W with a fairly good half‐decay lifetime of over 30,000 hours. With a further voltage reduction and a high‐index spherical extractor, 128 lm/W at 1000 cd/m 2 has been achieved.