Premium
Highly efficient white organic light‐emitting diodes with over 100 lm/W for next‐generation solid‐state lighting
Author(s) -
Yamae Kazuyuki,
Tsuji Hiroya,
Kittichungchit Varutt,
Ide Nobuhiro,
Komoda Takuya
Publication year - 2013
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 - 10.1002/jsid.203
Subject(s) - phosphorescence , materials science , optoelectronics , color rendering index , diode , color temperature , luminous efficacy , high color , oled , optics , white light , quantum efficiency , solid state , solid state lighting , flat panel , light emitting diode , computer science , physics , fluorescence , engineering physics , nanotechnology , layer (electronics) , artificial intelligence , color image , image processing , image (mathematics)
High‐performance two‐unit all‐phosphorescent white devices on a built‐up light extraction substrate that comprised high‐index materials were studied. As a result of suitable optical and electrical design, the device showed an extremely high efficacy of 114 lm/W at 1000 cd/m 2 . The device also showed 102 lm/W with long lifetime (LT70) of over 10,000 h at 3000 cd/m 2 . Outstanding external quantum efficiency of almost 50% was also achieved in a flat panel with an emissive area of 25 cm 2 . Color coordinates of the panel met the Energy Star ® criteria of solid‐state lighting with CIE (Commission Internationale de l'Éclairage) 1931 ( x , y ) = (0.477, 0.423), and the color rendering index was 81.