Balancing the white emission of OLED by a design of fluorescent blue and phosphorescent green/red emitting layer structures

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In this paper, we performed the design on the relative thickness of fluorescent-phosphorescent light emitters and evaluated the corresponding change of spectral characteristics of white organic light emitting diode (WOLED). Use of a 3-nm-thick separator composed of undoped phosphorescent host, which provides the confinement of singlet exciton, yields relatively well-defined broadband white emission. The optimized multilayers in WOLED comprises one of the simplest device structures among the reported fluorescent-phosphorescent hybrid WOLEDs. representing the Commission Internationale de I'Eclairage (CIE) 1931 chromaticity ranging from the nearly pure (0.30, 0.35) to warm white (0.35, 0.40) of 9.0-12.5 cd/A (24,000 cd/m(2) at 12 V bias). Although the presented efficiency data is not as high as the reports of others, design principles for a bright and stabilized three-peak-balanced white emission are discussed in detail, which will be beneficial for a step forwards in the development of broadband WOLED. (C) 2008 Elsevier B.V. All rights reserved.
Publisher
ELSEVIER SCIENCE SA
Issue Date
2009-02
Language
English
Article Type
Article
Keywords

LIGHT-EMISSION; DEVICES; EFFICIENCY; EXCITONS

Citation

SYNTHETIC METALS, v.159, no.3-4, pp.325 - 330

ISSN
0379-6779
DOI
10.1016/j.synthmet.2008.09.011
URI
http://hdl.handle.net/10203/24676
Appears in Collection
CBE-Journal Papers(저널논문)
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