Molecular packing correlated fluorescence in TIPS-pentacene films
Mengsi Niu, Fei Zheng, Xiaoyu Yang, Pengqing Bi, Lin Feng, Xiaotao Hao
ORGANIC ELECTRONICS | ELSEVIER | Published : 2017
The molecular packing and optical properties of exposed and buried layers (i.e. the layers at the top surface and near the substrate, respectively) were systematically studied in 6,13-Bis(triisopropylsilylethynyl)pentacene (TIPS-pentacene) films coated by spin-coated (SC) and droplet-pinned-crystallization (DPC) methods. Buried layers in both films exhibit intense photoluminescence (PL) resembling the behaviors of the molecules in dilute solution ascribing to weak π-π stacking, while the exposed layers show extremely weak PL due to strong crystallinity. Polarized excitation PL spectra demonstrate that molecular orientation of the buried layers is quasi-ordered in the film coated by DPC metho..View full abstract
Awarded by National Natural Science Foundation of China
Awarded by Fundamental Research Funds of Shandong University
Awarded by Chinese Academy of Sciences
This work was supported by the National Natural Science Foundation of China (No. 11574181, 61631166001); the Fundamental Research Funds of Shandong University (2014JC047); Open Research Fund of State Key Laboratory Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences (201514); and the " National Young 1000 Talents" Program of China. The authors would like to thank the Shanghai Synchrotron Radiation Facility (beamline BL16B1) for providing the beam time for GIXS measurements.