Essential Differences of Organic Films at the Molecular Level via Vacuum Deposition and Solution Processes for Organic Light-Emitting Diodes - Xing, Xing; Zhong, Luwei; Zhang, Lipei; Chen, Zhijian; Qu, Bo; Chen, Erqiang; Xiao, Lixin; Qihuang Gong (JOURNAL OF PHYSICAL CHEMISTRY C, 2013)