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Optical Engineering

White organic light-emitting diodes based on a novel starburst fluorene derivative
Author(s): Shuangling Lou; Junsheng Yu; Hui Lin; Yadong Jiang; Qing Zhang
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Paper Abstract

A white organic light-emitting diode (WOLED) with an undoped structure based on a novel starburst fluorene derivative of 1,2,3,4,5,6-hexakis(9,9-diethyl-9H-fluoren-2-yl) benzene (HKEthFLYPh) as an energy transfer layer was fabricated by the thermal vacuum deposition method. N,N′-di(naphthalen-2-yl)-N,N′-diphenyl-benzene (NPB) and tris(8-hydroxyquinolinato) aluminum (Alq) were used as the blue and yellow-green emission layers, respectively. The structure of the device was indium-tin-oxide (ITO)/NPB/HKEthFLYPh/Alq/Mg:Ag. The results demonstrated that the triple-layer device had a white light emission with a maximum luminance of 8800 cd/cm2 at 15 V and a stable current efficiency from 1.8 to 1.4 cd/A at various bias voltages ranging from 5.5 to 15 V. The electroluminescent (EL) spectra overlaid from 400 to 700 nm with a full width at half maximum (FWHM) of 190 nm, which covered the whole visible wavelength region. The Commission Internationale de l'Eclairage (CIE) chromaticity coordinates showed (x=0.29,y=0.36) at 8 V and changed from (x=0.31,y=0.38) to (x=0.26,y=0.31) under bias voltage from 5 to 12 V.

Paper Details

Date Published: 1 April 2008
PDF: 5 pages
Opt. Eng. 47(4) 044002 doi: 10.1117/1.2911737
Published in: Optical Engineering Volume 47, Issue 4
Show Author Affiliations
Shuangling Lou, Univ. of Electronic Science and Technology of China (China)
Junsheng Yu, Univ. of Electronic Science and Technology of China (China)
Hui Lin, Univ. of Electronic Science and Technology of China (China)
Yadong Jiang, Univ. of Electronic Science and Technology of China (China)
Qing Zhang, Shanghai Jiao Tong Univ. (China)


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