Open AccessSimplified Bilayer White Phosphorescent Organic Light‐Emitting Diodes
Author(s) -
Lee Jonghee,
Sung Woo Jin,
Joo Chul Woong,
Cho Hyunsu,
Cho Namsung,
Lee GaWon,
Hwang DoHoon,
Lee JeongIk
Publication year - 2016
Publication title -
etri journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 46
eISSN - 2233-7326
pISSN - 1225-6463
DOI - 10.4218/etrij.16.2515.0011
Subject(s) - iridium , phosphorescence , oled , triphenylamine , dopant , materials science , phosphorescent organic light emitting diode , optoelectronics , diode , photochemistry , quantum efficiency , doping , chemistry , optics , physics , nanotechnology , fluorescence , layer (electronics) , organic chemistry , catalysis
We report on highly efficient blue, orange, and white phosphorescent organic light‐emitting diodes consisting only two organic layers. Hole transporting 4, 4,’ 4”‐tris (N‐carbazolyl)triphenylamine (TcTa) and electron transporting 2‐(diphenylphosphoryl) spirofluorene (SPPO1) are used as an emitting host for orange light‐emitting bis(3‐benzothiazol‐2‐yl‐9‐ethyl‐9H‐carbazolato) (acetoacetonate) iridium ((btc)2(acac)Ir) and blue light‐emitting iridium(III)bis(4,6‐difluorophenyl‐pyridinato‐N,C2’) picolinate (FIrpic) dopant, respectively. Combining these two orange and blue light‐emitting layers, we successfully demonstrate highly efficient white PHOLEDs while maintaining Commission internationale de l'éclairage coordinates of ( x = 0.373 , y = 0.443 ). Accordingly, we achieve a maximum external quantum, current, and power efficiencies of 12.9%, 30.3 cd/A, and 30.0 lm/W without out‐coupling enhancement.