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Journal Article
Effects of Interlayers on Phosphorescent Blue Organic Light-Emitting Diodes
- Authors
- Jong hee Lee, Jeong-Ik Lee, Ki-Im Song, Su Jin Lee, Hye Yong Chu
- Issue Date
- 2008-05
- Citation
- Applied Physics Letters, v.92 no.20, pp.1-3
- ISSN
- 0003-6951
- Publisher
- American Institute of Physics (AIP)
- Language
- English
- Type
- Journal Article
- Project Code
- 07IB1600, 고효율 백색 OLED 소자 기술 개발, Chu Hye Yong
- Abstract
- We demonstrate that the electroluminescence efficiencies of blue organic light-emitting diodes can be significantly enhanced by the incorporation of interlayers at the hole transporting layer (HTL)/emitting layer (EML) and/or EML/electron transporting layer (ETL) interfaces. Blue light-emitting iridium(III)bis(4,6-difluorophenyl)-pyridinato- N, C2??) picolinate was doped in an m -bis-(triphenylsilyl)benzene (UGH3) host and hole transporting wide band gap materials were introduced between the HTL and the EML as interlayers in order to block triplet exciton quenching and reduce electron overflow. The effects of adding a second undoped UGH3 interlayer at the EML/ETL interface were also studied. When the appropriate interlayers were added, the device performances were found to be dramatically enhanced, with peak external quantum and power efficiencies of 20.1% and 29.2 lmW. © 2008 American Institute of Physics.
- KSP Keywords
- Blue light-emitting, Hole transporting layer, Organic light-emitting diodes(OLEDS), Triplet exciton, electron transporting layer, exciton quenching, light-emitting diode(LED), wide band gap materials