Multicolor emission from large-area porous thin films constructed of nanowires of small organic molecules.
We describe a facile low-temperature physical vapor deposition approach to fabricate porous network thin films constructed of nanowires of small organic molecules on a large area. Supermolecular assemblies of pyrene nanowires based on a combination of van der Waals forces and pi-pi stacking tend to hierarchically self-assemble to form uniform porous films using our techniques. The morphology of the films is studied and we also study several reasons influencing the process of assembly such as evaporation temperature, deposition temperature, and different kinds of substrate. The deposition temperature is determined to be the main reason for hierarchical aggregation. Typically prepared films exhibit unique optical properties, that is, multicolor red-green-blue emissions. This novel method can be applied to other organic molecular systems and may be potentially used to place nanoscaled building blocks directly on solid surfaces for fabricating large-area nanostructure-based flat screens.
Wang
Zhe-Chen
ZC
Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Haidian, Beijing 100190, People's Republic of China. Graduate School of Chinese Academy of Sciences, Beijing 100039, People's Republic of China.
Xiao
Wen-Chang
WC
Ding
Xun-Lei
XL
Ma
Yan-Ping
YP
Xue
Wei
W
He
Sheng-Gui
SG