Negative giant surface potential of vacuum-evaporated tris(7-propyl-8-hydroxyquinolinolato) aluminum(III) [Al(7-Prq)3] film
Negative giant surface potential of vacuum-evaporated tris(7-propyl-8-hydroxyquinolinolato) aluminum(III) [Al(7-Prq)3] film
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DOI：
10.1016/j.orgel.2013.04.032
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发表时间：
2013-08-01
影响因子：
3.2
通讯作者：
Han, Jin Wook
中科院分区：
文献类型：
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作者：
Isoshima, Takashi;Okabayashi, Youichi;Han, Jin Wook
在真空蒸发的三（7-丙基-8-羟基喹啉）铝（III）[Al（7-Prq）（3）]薄膜中实现了负巨表面电位。该膜的电吸收响应呈现出与三（8-羟基喹啉）铝（Alq（3））相反的极性，表明分子取向具有相反的非中心对称性。提出了考虑分子几何效应的不对称骰子模型，指出配体7位上的丙基取代会影响分子在表面上的姿态，从而使非中心对称性的极性反转。我们的研究结果开辟了一个新的可能性，控制分子取向的薄膜器件应用。(C)2013爱思唯尔有限公司版权所有。
Negative giant surface potential was realized in a vacuum-evaporated film of tris(7-propyl-8-hydroxyquinolinolato) aluminum(III) [Al(7-Prq)(3)]. Electroabsorption response of the film presented an inverted polarity to that of tris(8-hydroxyquinolinolato) aluminum (Alq(3)), suggesting opposite noncentrosymmetry of molecular orientation. Asymmetric dice model with molecular geometric effect has been proposed, and propyl substitution at 7 position of the ligands was indicated to affects the molecular posture on the surface to invert the polarity of noncentrosymmetry. Our results opened a new possibility of controlling molecular orientation in a film for device applications. (C) 2013 Elsevier B.V. All rights reserved.