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

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

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(...

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Main Authors: S. W. Liu, X. W. Sun, Hilmi Volkan Demir
Format: Article
Language:English
Published: AIP Publishing LLC 2012-03-01
Series:AIP Advances
Online Access:http://dx.doi.org/10.1063/1.3701685
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spelling doaj-e4a2d69ca97141818e548a6d6d3f90cb2020-11-24T22:19:46ZengAIP Publishing LLCAIP Advances2158-32262012-03-0121012192012192-710.1063/1.3701685111201ADVGraded-host phosphorescent light-emitting diodes with high efficiency and reduced roll-offS. W. Liu0X. W. Sun1Hilmi Volkan Demir2 Luminous! Center of Excellence for Semiconductor Lighting & Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798 Luminous! Center of Excellence for Semiconductor Lighting & Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798 Luminous! Center of Excellence for Semiconductor Lighting & Displays, School of Electrical and Electronic Engineering, Nanyang Technological University, Nanyang Avenue, Singapore 639798We 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(N-carbazolyl)triphenylamine, respectively, with graded composition, and the phosphorescent red emitter bis(2-phenylquinoline) (acetylacetonate) iridium(III), which was uniformly doped into the graded host matrix. The graded host device shows improved quantum efficiency and power efficiency with significantly reduced efficiency roll-off as compared to the unipolar-host and double layer heterojunction host devices.http://dx.doi.org/10.1063/1.3701685
collection DOAJ
language English
format Article
sources DOAJ
author S. W. Liu
X. W. Sun
Hilmi Volkan Demir
spellingShingle S. W. Liu
X. W. Sun
Hilmi Volkan Demir
Graded-host phosphorescent light-emitting diodes with high efficiency and reduced roll-off
AIP Advances
author_facet S. W. Liu
X. W. Sun
Hilmi Volkan Demir
author_sort S. W. Liu
title Graded-host phosphorescent light-emitting diodes with high efficiency and reduced roll-off
title_short Graded-host phosphorescent light-emitting diodes with high efficiency and reduced roll-off
title_full Graded-host phosphorescent light-emitting diodes with high efficiency and reduced roll-off
title_fullStr Graded-host phosphorescent light-emitting diodes with high efficiency and reduced roll-off
title_full_unstemmed Graded-host phosphorescent light-emitting diodes with high efficiency and reduced roll-off
title_sort graded-host phosphorescent light-emitting diodes with high efficiency and reduced roll-off
publisher AIP Publishing LLC
series AIP Advances
issn 2158-3226
publishDate 2012-03-01
description 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(N-carbazolyl)triphenylamine, respectively, with graded composition, and the phosphorescent red emitter bis(2-phenylquinoline) (acetylacetonate) iridium(III), which was uniformly doped into the graded host matrix. The graded host device shows improved quantum efficiency and power efficiency with significantly reduced efficiency roll-off as compared to the unipolar-host and double layer heterojunction host devices.
url http://dx.doi.org/10.1063/1.3701685
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AT xwsun gradedhostphosphorescentlightemittingdiodeswithhighefficiencyandreducedrolloff
AT hilmivolkandemir gradedhostphosphorescentlightemittingdiodeswithhighefficiencyandreducedrolloff
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