http://dx.doi.org/10.1016/j.orgel.2009.11.001">
 

Document Type

Journal Article

Department/Unit

Department of Chemistry

Title

Reduced efficiency roll-off in highly efficient and color-stable hybrid WOLEDs: The Influence of triplet transfer and charge-transport behavior on enhancing device performance

Language

English

Abstract

By wisely utilizing combinations of exciton-managed orange-phosphorescence/sky blue-fluorescence, we report on high-efficiency white organic light-emitting diodes (WOLEDs) with high color-stability together with reduced efficiency roll-off. Two WOLEDs with the peak current efficiencies of 34.5 and 42.5 cd A-1 which slightly shift to 34.2 and 40.0 cd A-1 at 1000 cd m-2 are demonstrated. Systematic investigations focused on the effects of hole-injection buffer layer, thickness of emitting-layer (EML) and the stepwise-doping profile of orange phosphorescent EML on the device performance have been performed. It is evidently shown that careful management of the triplet/singlet excitons and charge-carriers is key to realizing such high performance of the devices. The results will beyond doubt be helpful to the design of both material and device structure for high-performance WOLEDs and next-generation solid-state lighting sources. © 2009 Elsevier B.V. All rights reserved.

Keywords

Carbazole, Iridium complexes, Organic light-emitting diodes, Triplet emission, White light

Publication Date

2010

Source Publication Title

Organic Elecronics

Volume

11

Issue

2

Start Page

238

End Page

246

Publisher

Elsevier

ISSN (print)

15661199

ISSN (electronic)

18785530

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