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Proceedings Paper

Degradation of blue phosphorescent organic LEDs analyzed by solution NMR spectroscopy
Author(s): Tatsuya Fukushima; Hajime Suzuki; Hiroto Ito; Shinya Ootsu; Kunimasa Hiyama; Hiroshi Kita; Hironori Kaji
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Paper Abstract

In organic light-emitting diodes (OLEDs), device degradation is one of the crucial problems to be solved. In this study, we have investigated material degradations in FIrpic-based phosphorescent OLEDs by solution nuclear magnetic resonance (NMR) spectroscopy. NMR experiments clearly indicate that about 18% of TPhDB molecules, which is used as an electron-transporting material, are decomposed during driving the devices. The decomposition of the TPhDB molecules is considered to be related to the device degradation. This study demonstrates that solution NMR spectroscopy is a useful tool to investigate an origin of device degradation of multi-layered OLEDs in terms of decomposition of organic molecules.

Paper Details

Date Published: 8 October 2014
PDF: 3 pages
Proc. SPIE 9183, Organic Light Emitting Materials and Devices XVIII, 91830H (8 October 2014); doi: 10.1117/12.2064518
Show Author Affiliations
Tatsuya Fukushima, Kyoto Univ. (Japan)
Hajime Suzuki, Kyoto Univ. (Japan)
Hiroto Ito, Konica Minolta, Inc. (Japan)
Shinya Ootsu, Konica Minolta, Inc. (Japan)
Kunimasa Hiyama, Konica Minolta, Inc. (Japan)
Hiroshi Kita, Konica Minolta, Inc. (Japan)
Hironori Kaji, Kyoto Univ. (Japan)

Published in SPIE Proceedings Vol. 9183:
Organic Light Emitting Materials and Devices XVIII
Franky So; Chihaya Adachi, Editor(s)

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