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

S. W. Liu; X. W. Sun; Hilmi Volkan Demir

doi:10.1063/1.3701685

journal article·2012-03-01Open access

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

S. W. Liu, X. W. Sun, Hilmi Volkan Demir

AIP Advances· Volume 2· Issue 1

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Source abstract

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(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.

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Research context

OpenAlex topics: Organic Light-Emitting Diodes Research · Organic Electronics and Photovoltaics · Luminescence and Fluorescent Materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Nanyang Technological University 1 Luminous! Center of Excellence for Semiconductor Lighting & Displays, School of Electrical and Electronic Engineering, , Nanyang Avenue, Singapore 639798

Tianjin University 2 Department of Applied Physics, College of Science, , Tianjin 300072, China

Nanyang Technological University 3 School of Physical and Mathematical Sciences, , Nanyang Avenue, Singapore 639798

Bilkent University 4 Department of Electrical and Electronic Engineering, Department of Physics, UNAM-National Nanotechnology Research Center, , Bilkent, Ankara, Turkey 06800

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