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

Research output: Contribution to journalArticlepeer-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 languageEnglish
Article number087124
JournalAIP Advances
Volume5
Issue number8
DOIs
Publication statusPublished - Aug 1 2015

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

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