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Proceedings Paper

Optical processes of organic emitters in optical microcavity
Author(s): Kun-Cheng Tien; Hao-Wu Lin; Chun-Liang Lin; Han-Chieh Chang; Ting-Yi Cho; Chih-Jen Yang; Chih-Hao Chang; Chung-Chih Wu
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Paper Abstract

Optical characteristics of microcavity organic light-emitting devices (OLEDs) having two mirrors are examined. Analyses show that a high-reflection back mirror and a low-loss high-reflection exit mirror are essential for such microcavity devices to obtain luminance enhancement relative to conventional noncavity devices. The capping layer in the composite mirror plays the role of enhancing reflection and reducing absorption loss, rather than enhancing transmission. In addition, by setting the normal-direction resonant wavelength around the peak wavelength of the intrinsic emission, one obtains the highest luminance enhancement along the normal direction and hardly detectable color shift with viewing angles, yet accompanied by highly directed emission and lower external quantum efficiency. On the other hand, the highest enhancement in external quantum efficiencies and the most uniform brightness distribution are obtained by setting the normal-direction resonant wavelength 20-40 nm longer than the peak wavelength of the intrinsic emission, yet with noticeable color shift over viewing angles. Due to the tradeoffs between different emission characteristics in choosing the resonant wavelength, the exact design of microcavity devices would depend on actual applications.

Paper Details

Date Published: 15 September 2007
PDF: 12 pages
Proc. SPIE 6639, Nanophotonic Materials IV, 663907 (15 September 2007); doi: 10.1117/12.735224
Show Author Affiliations
Kun-Cheng Tien, National Taiwan Univ. (Taiwan)
Hao-Wu Lin, National Taiwan Univ. (Taiwan)
Chun-Liang Lin, National Taiwan Univ. (Taiwan)
Han-Chieh Chang, National Taiwan Univ. (Taiwan)
Ting-Yi Cho, National Taiwan Univ. (Taiwan)
Chih-Jen Yang, National Taiwan Univ. (Taiwan)
Chih-Hao Chang, National Taiwan Univ. (Taiwan)
Chung-Chih Wu, National Taiwan Univ. (Taiwan)

Published in SPIE Proceedings Vol. 6639:
Nanophotonic Materials IV
Zeno Gaburro; Stefano Cabrini, Editor(s)

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