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Journal Article
Simplified Bilayer White Phosphorescent Organic Light-Emitting Diodes
- Authors
- Jonghee Lee, Woo Jin Sung, Chul Woong Joo, Hyunsu Cho, Namsung Cho, Ga-Won Lee, Do-Hoon Hwang, Jeong-Ik Lee
- Issue Date
- 2016-04
- Citation
- ETRI Journal, v.38, no.2, pp.260-264
- ISSN
- 1225-6463
- Publisher
- 한국전자통신연구원 (ETRI)
- Language
- English
- Type
- Journal Article
- Abstract
- 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 lightemitting bis(3-benzothiazol-2-yl-9-ethyl-9H-carbazolato) (acetoacetonate) iridium ((btc)2(acac)Ir) and blue lightemitting 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'챕clairage 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.
- KSP Keywords
- Blue light-emitting, Electron transporting, Highly efficient, Organic layer, coupling enhancement, light emitting diodes(LED), organic light emitting diode(OLED), out-coupling, phosphorescent organic light-emitting diodes