Essential Differences of Organic Films at the Molecular Level via Vacuum Deposition and Solution Processes for Organic Light-Emitting Diodes

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• 作者：Xing Xing ; Luwei Zhong ; Lipei Zhang ; Zhijian Chen ; Bo Qu ; Erqiang Chen ; Lixin Xiao ; Qihuang Gong
• 刊名：Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：December 5, 2013
• 年：2013
• 卷：117
• 期：48
• 页码：25405-25408
• 全文大小：288K
• 年卷期：v.117,no.48(December 5, 2013)
• ISSN：1932-7455

文摘

This paper presents an in-depth understanding of the essential differences of organic small-molecule thin films at the molecular level via vacuum deposition and solution processes for organic light-emitting diodes (OLEDs). Synchrotron-based two-dimensional grazing incidence X-ray diffraction has been used to investigate the essential difference. The result reveals that tris(4-carbazoyl-9-ylphenyl)amine (TCTA) molecules show highly oriented arrangements, that is, face-to-face 蟺鈥撓€ stacking, in vacuum-deposited films, unlike the randomly arranged molecules in spin-coated films. The face-to-face 蟺鈥撓€ stacking behavior of the molecules in a vacuum-deposited TCTA film leads to higher hole-transport mobility, which is the essential reason for the higher efficiency of a vacuum-deposited OLED compared with that of a solution-processed counterpart, consistent with the calculation results.