Controlled Self-Assembly of Organic Microcrystals for Laser Applications

• Published in: Journal of physical chemistry. C 2015-09, Vol.119 (38), p.22108-22113
• Main Authors: Lu, Xiaomei, Wang, Xuedong, Liao, Qing, Fu, Hongbing
• Format: Article
• Language: English
• ISSN: 1932-7447; 1932-7455
• DOI: 10.1021/acs.jpcc.5b06063

The small organic molecule p-distyrylbenzene (DSB) has been controllably prepared into one-dimensional microwires (1D-MWs) and 2D rhombic microdisks (2D-RMDs) by modulating the growth kinetics in the process of morphology growth. These as-prepared organic microcrystals, 1D-MWs and 2D-RMDs, exhibit a shape-dependent microcavity effect in that the single 1D-MW can act as a Fabry-Pérot (FP) mode lasing resonator while the individual 2D-RMD functions as the whispering-gallery-mode (WGM) microcavity. Moreover, as compared with the 1D FP resonators, there exists a higher quality factor (Q) in the WGM lasing resonator under the identical optical path length. Significantly, the lasing threshold, E th = 1.02 μJ/cm2, of 2D-RMDs is much lower than E th = 2.57 μJ/cm2 of 1D-MWs. Our demonstration can give the direction for the development of the organic solid-state microlasers.