Material degradation of liquid organic semiconductors analyzed by nuclear magnetic resonance spectroscopy

Tatsuya Fukushima; Junichi Yamamoto; Masashi Fukuchi; Shuzo Hirata; Heo Hyo Jung; Osamu Hirata; Yuki Shibano; Chihaya Adachi; Hironori Kaji

doi:10.1063/1.4928515

Material degradation of liquid organic semiconductors analyzed by nuclear magnetic resonance spectroscopy

Tatsuya Fukushima, Junichi Yamamoto, Masashi Fukuchi, Shuzo Hirata, Heo Hyo Jung, Osamu Hirata, Yuki Shibano, Chihaya Adachi, Hironori Kaji

Applied Chemistry

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

Liquid organic light-emitting diodes (liquid OLEDs) are unique devices consisting only of liquid organic semiconductors in the active layer, and the device performances have been investigated recently. However, the device degradation, especially, the origin has been unknown. In this study, we show that material degradation occurs in liquid OLEDs, whose active layer is composed of carbazole with an ethylene glycol chain. Nuclear magnetic resonance (NMR) experiments clearly exhibit that the dimerization reaction of carbazole moiety occurs in the liquid OLEDs during driving the devices. In contrast, cleavages of the ethylene glycol chain are not detected within experimental error. The dimerization reaction is considered to be related to the device degradation.

Original language	English
Article number	087124
Journal	AIP Advances
Volume	5
Issue number	8
DOIs	https://doi.org/10.1063/1.4928515
Publication status	Published - Aug 1 2015

All Science Journal Classification (ASJC) codes

Physics and Astronomy(all)

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10.1063/1.4928515

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title = "Material degradation of liquid organic semiconductors analyzed by nuclear magnetic resonance spectroscopy",

abstract = "Liquid organic light-emitting diodes (liquid OLEDs) are unique devices consisting only of liquid organic semiconductors in the active layer, and the device performances have been investigated recently. However, the device degradation, especially, the origin has been unknown. In this study, we show that material degradation occurs in liquid OLEDs, whose active layer is composed of carbazole with an ethylene glycol chain. Nuclear magnetic resonance (NMR) experiments clearly exhibit that the dimerization reaction of carbazole moiety occurs in the liquid OLEDs during driving the devices. In contrast, cleavages of the ethylene glycol chain are not detected within experimental error. The dimerization reaction is considered to be related to the device degradation.",

author = "Tatsuya Fukushima and Junichi Yamamoto and Masashi Fukuchi and Shuzo Hirata and Jung, {Heo Hyo} and Osamu Hirata and Yuki Shibano and Chihaya Adachi and Hironori Kaji",

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T1 - Material degradation of liquid organic semiconductors analyzed by nuclear magnetic resonance spectroscopy

AU - Fukushima, Tatsuya

AU - Yamamoto, Junichi

AU - Fukuchi, Masashi

AU - Hirata, Shuzo

AU - Jung, Heo Hyo

AU - Hirata, Osamu

AU - Shibano, Yuki

AU - Adachi, Chihaya

AU - Kaji, Hironori

PY - 2015/8/1

Y1 - 2015/8/1

N2 - Liquid organic light-emitting diodes (liquid OLEDs) are unique devices consisting only of liquid organic semiconductors in the active layer, and the device performances have been investigated recently. However, the device degradation, especially, the origin has been unknown. In this study, we show that material degradation occurs in liquid OLEDs, whose active layer is composed of carbazole with an ethylene glycol chain. Nuclear magnetic resonance (NMR) experiments clearly exhibit that the dimerization reaction of carbazole moiety occurs in the liquid OLEDs during driving the devices. In contrast, cleavages of the ethylene glycol chain are not detected within experimental error. The dimerization reaction is considered to be related to the device degradation.

AB - Liquid organic light-emitting diodes (liquid OLEDs) are unique devices consisting only of liquid organic semiconductors in the active layer, and the device performances have been investigated recently. However, the device degradation, especially, the origin has been unknown. In this study, we show that material degradation occurs in liquid OLEDs, whose active layer is composed of carbazole with an ethylene glycol chain. Nuclear magnetic resonance (NMR) experiments clearly exhibit that the dimerization reaction of carbazole moiety occurs in the liquid OLEDs during driving the devices. In contrast, cleavages of the ethylene glycol chain are not detected within experimental error. The dimerization reaction is considered to be related to the device degradation.

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Material degradation of liquid organic semiconductors analyzed by nuclear magnetic resonance spectroscopy

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