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An ambipolar phosphine oxide-based host for high power efficiency blue phosphorescent organic light emitting devices.
- Source :
- Applied Physics Letters; 6/1/2009, Vol. 94 Issue 22, p223304, 3p, 3 Graphs
- Publication Year :
- 2009
-
Abstract
- We report blue electrophosphorescent organic light emitting devices with an ambipolar host material, 4-(diphenylphosphoryl)-N,N-diphenylaniline (HM-A1), doped with FIrpic (iridium (III)bis[(4,6-difluorophenyl)-pyridinato-N,C<superscript>2<superscript>′</superscript></superscript>]picolinate). The ambipolar nature of the host was verified using single carrier devices. The power efficiency of devices with PO15 (2,8-bis(diphenylphosphoryl)dibenzothiophene) electron transport layer (ETL) showed optimized performance when the ETL thickness was 500 Å, giving a peak power efficiency of 46 lm/W (corresponding external quantum efficiency (EQE) of 17.1%). The EQE and power efficiency at the brightness of 800 cd/m<superscript>2</superscript> were measured with no light outcoupling enhancement and found to be 15.4% and 26 lm/W, respectively. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 00036951
- Volume :
- 94
- Issue :
- 22
- Database :
- Complementary Index
- Journal :
- Applied Physics Letters
- Publication Type :
- Academic Journal
- Accession number :
- 41139467
- Full Text :
- https://doi.org/10.1063/1.3148642