Material degradation of liquid organic semiconductors analyzed by nuclear magnetic resonance spectroscopy
Material degradation of liquid organic semiconductors analyzed by nuclear magnetic resonance spectroscopy
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DOI：
10.1063/1.4928515
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发表时间：
2015-08-01
期刊：
影响因子：
1.6
通讯作者：
Kaji, Hironori
中科院分区：
文献类型：
--
作者：
Fukushima, Tatsuya;Yamamoto, Junichi;Kaji, Hironori
液态有机电致发光二极管（Liquid OLED）是一种有源层仅由液态有机半导体组成的独特器件，其器件性能近年来得到了广泛的研究。然而，器械退化，特别是其原因一直不明。在这项研究中，我们表明，材料降解发生在液体OLED，其活性层是由咔唑与乙二醇链。核磁共振（NMR）实验清楚地表明，在驱动器件的过程中，咔唑基团在液体OLED中发生了二聚反应。相比之下，乙二醇链的裂解在实验误差内未检测到。认为二聚反应与器械降解相关。(C)2015年作者。除非另有说明，否则所有文章内容均根据Creative Commons Attribution 3.0 Unported License许可。
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. (C) 2015 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution 3.0 Unported License.