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17.3: Highly Efficient Fluorescent/Phosphorescent OLED Devices Using Triplet Harvesting
Author(s) -
Kondakova Marina E.,
Giesen David J.,
Deaton Joseph C.,
Liao LiangSheng,
Pawlik Thomas D.,
Kondakov Denis Y.,
Miller Michael E.,
Royster Tommie L.,
Comfort Dustin L.
Publication year - 2008
Publication title -
sid symposium digest of technical papers
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.351
H-Index - 44
eISSN - 2168-0159
pISSN - 0097-966X
DOI - 10.1889/1.3069627
Subject(s) - oled , phosphorescence , optoelectronics , fluorescence , materials science , electroluminescence , quantum efficiency , tandem , excited state , layer (electronics) , optics , physics , nanotechnology , atomic physics , composite material
We demonstrate efficient white and non‐white hybrid OLED devices operating by a triplet harvesting mechanism to create light. Triplet excited states are generated in a blue fluorescent light‐emitting layer (LEL) and utilized upon their diffusion to the phosphorescent LEL(s). At 1000 cd/m 2 a blue/yellow hybrid OLED device shows external quantum efficiency (EQE) of 13.6%, 3.8 V, 30.1 lm/W, and excellent color characteristics suitable for display application. Performance of non‐white‐emitting hybrids, RGB white, and a tandem hybrid device is discussed. The triplet harvesting mechanism in all hybrid devices was verified by several experimental methods (spectral analysis, time‐resolved electroluminescence (EL), magnetic field effect on EL).