Stable efficiency roll-off in phosphorescent organic light-emitting diodes
- 14 January 2008
- journal article
- research article
- Published by AIP Publishing in Applied Physics Letters
- Vol. 92 (2), 023513
- https://doi.org/10.1063/1.2836270
Abstract
Origin of efficiency roll-off in phosphorescent organic light-emitting diodes was investigated with triplet mixed host devices and stable devices with little efficiency roll-off was developed. Efficiency roll-off was significant in the device with narrow recombination zone (RZ) and charge leakage out of emitting layer at high luminance was critical to efficiency roll-off. Efficiency roll-off could be reduced in triplet mixed host device with broad RZ and little charge leakage at high driving voltage. Triplet mixed host devices with an exciton blocking layer showed a quantum efficiency over 90% of maximum quantum efficiency at a luminance of .
Keywords
This publication has 10 references indexed in Scilit:
- Reduced efficiency roll-off in phosphorescent organic light emitting diodes by suppression of triplet-triplet annihilationApplied Physics Letters, 2007
- High efficiency phosphorescent organic light-emitting diodes using carbazole-type triplet exciton blocking layerApplied Physics Letters, 2007
- Triplet-exciton quenching in organic phosphorescent light-emitting diodes with Ir-based emittersPhysical Review B, 2007
- Quenching effects in organic electrophosphorescencePhysical Review B, 2002
- Nearly 100% internal phosphorescence efficiency in an organic light-emitting deviceJournal of Applied Physics, 2001
- Transient analysis of organic electrophosphorescence. II. Transient analysis of triplet-triplet annihilationPhysical Review B, 2000
- Transient analysis of organic electrophosphorescence: I. Transient analysis of triplet energy transferPhysical Review B, 2000
- Phosphorescent materials for application to organic light emitting devicesPublished by Walter de Gruyter GmbH ,1999
- Triplet exciton — trapped hole interaction in anthracene crystalsSolid State Communications, 1971
- Triplet excitons and Delayed Fluorescence in Anthracene CrystalsPhysical Review Letters, 1963