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

S. W. Liu | Zendy; Xiao Wei Sun | Zendy; Hilmi Volkan Demir | Zendy

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

Author(s) -

S. W. Liu,

Xiao Wei Sun,

Hilmi Volkan Demir

Publication year - 2012

Publication title -

aip advances

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 0.421

H-Index - 58

ISSN - 2158-3226

DOI - 10.1063/1.3701685

Subject(s) - phosphorescence , quantum efficiency , iridium , oled , materials science , optoelectronics , common emitter , electrical efficiency , triphenylamine , host (biology) , diode , luminous efficacy , doping , phosphorescent organic light emitting diode , layer (electronics) , chemistry , optics , fluorescence , power (physics) , nanotechnology , organic chemistry , ecology , physics , biology , quantum mechanics , catalysis

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. © 2012 Author(s)

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