Graded-host phosphorescent light-emitting diodes with high efficiency and reduced roll-off

Date
2012
Advisor
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Source Title
AIP Advances
Print ISSN
2158-3226
Electronic ISSN
2158-3226
Publisher
A I P Publishing LLC
Volume
2
Issue
1
Pages
012192-1 - 012192-7
Language
English
Type
Article
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Abstract

We demonstrated graded-host phosphorescent organic light-emitting diodes with high efficiency and reduced efficiency roll-off. The emissive layer of the graded host device consists of both electron and hole transport type hosts, 1,3,5-tris(N-phenylbenzimidazole-2-yl)benzene (TPBI) and 4,4-,4- tris(Ncarbazolyl) triphenylamine, respectively, with graded composition, and the phosphorescent red emitter bis(2-phenylquinoline) (acetylacetonate) iridium(III), which wasuniformly doped into the graded hostmatrix. The graded host device shows improved quantum efficiency and power efficiency with significantly reduced efficiency rolloff as compared to the unipolar-host and double layer heterojunction host devices.

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Keywords
Acetylacetonates, Double layers, Emissive layers, Graded composition, Hole transports, Host devices, Phosphorescent organic light-emitting diodes, Power efficiency, Red emitter, Triphenyl amines, Benzene, Heterojunctions, Iridium compounds, Light emission, Light emitting diodes, Phosphorescence, Efficiency
Citation
Published Version (Please cite this version)