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Proceedings Paper

Introduction of photonic crystal structure into organic light-emitting diode
Author(s): Masayuki Fujita; Takashi Asano; Susumu Noda; Hiroshi Ohata; Taishi Tsuji; Hitoshi Nakada; Noriyuki Shimoji
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Paper Abstract

An Organic light-emitting diode (OLED) is very promising device for a flat panel display and an illumination applications due to the possibility of very thin and flexible structures, large area emission, high brightness and low power consumption. To realize a high efficiency is one of the most important issues for these applications. Improvements in OLED efficiency are studied via the introduction of photonic crystal (PC) structures, which are expected to realize the versatile control of light. We fabricate two-dimensional PC structures in the organic and indium-tin-oxide anode layers in which most of the light is confined. This results in light extraction from the waveguide mode. Improvements of 20 and 130% are observed in the spectrally-integrated intensity and the peak intensity, respectively, in comparison with samples without PCs. As the thickness of the organic layer is reduced, lower operating voltages are found to maintain the light-extraction efficiency. We can expect further improvement in the overall efficiency by optimizing this structure.

Paper Details

Date Published: 31 January 2005
PDF: 10 pages
Proc. SPIE 5624, Semiconductor and Organic Optoelectronic Materials and Devices, (31 January 2005); doi: 10.1117/12.579597
Show Author Affiliations
Masayuki Fujita, Kyoto Univ. (Japan)
Takashi Asano, Kyoto Univ. (Japan)
Susumu Noda, Kyoto Univ. (Japan)
Hiroshi Ohata, Pioneer Corp. (Japan)
Taishi Tsuji, Pioneer Corp. (Japan)
Hitoshi Nakada, Pioneer Corp. (Japan)
Noriyuki Shimoji, Rohm Corp., Ltd. (Japan)

Published in SPIE Proceedings Vol. 5624:
Semiconductor and Organic Optoelectronic Materials and Devices
Chung-En Zah; Yi Luo; Shinji Tsuji, Editor(s)

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