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Proceedings Paper

An effective intermediate Al/Au electrode for stacked color-tunable organic light emitting devices
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Paper Abstract

Bright and efficient stacked color-tunable organic light emitting devices (OLEDs) using intermediate Al/Au electrode have been reported. The effects of the thickness of Al and Au layer on the luminance characteristics have been comprehensively studied. After the optimization, After the optimization, the bottom-emission single-unit OLED of 4,4',4"-Tris(N-3-methylphenyl-N-phenyl-amino) triphenylamine /N,N'-diphenyl-N,N'-bis(1-naphthyl)-(1,1'-biphenyl)- 4,4'-diamine /tris(8-hydroxyquinoline) aluminum has a maximum luminance efficiency (ηL) of 3.37 by using Al/Au as the cathode and 2.92 cd/A by using Al/Au as the anode. By introducing the optimized intermediate Al/Au electrode into the stacked color-tunable OLEDs, red unit with maximum ηL of 4.73 cd/A and blue unit with maximum ηL of 3.96 cd/A have been obtained. The color can be tuned efficiently along a linear route from pure red with the Commission Internationale de l'Eclairage (CIE) coordinates of (0.662, 0.330) to sky blue with the CIE coordinates of (0.155, 0.340). This scheme can be a potential candidate for achieving high brightness and efficient stacked color-tunable OLEDs.

Paper Details

Date Published: 16 April 2008
PDF: 9 pages
Proc. SPIE 6999, Organic Optoelectronics and Photonics III, 69992R (16 April 2008); doi: 10.1117/12.779449
Show Author Affiliations
Tianhang Zheng, The Univ. of Hong Kong (Hong Kong China)
Wallace C. H. Choy, The Univ. of Hong Kong (Hong Kong China)

Published in SPIE Proceedings Vol. 6999:
Organic Optoelectronics and Photonics III
Paul L. Heremans; Michele Muccini; Eric A. Meulenkamp, Editor(s)

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