Cubic silicon carbide (SiC) nanowires are synthesized in a catalyst-assisted process. The nanowires with diameter of ~40 nm exhibit strong blue light emission at room temperature under ultraviolet (UV) femtosecond laser excitation. The photon energy of peak emission is higher than the energy bandgap of cubic SiC which shows involvement of quantum confinement effect. The ultrafast fluorescence is deconvoluted by Monte-Carlo method. The results show two ultrafast decay processes whose lifetimes are about 26 and 567 ps respectively. The mechanisms of such ultrafast processes are discussed.
© 2007 Chinese Optics Letters
(140.7090) Lasers and laser optics : Ultrafast lasers
(250.0250) Optoelectronics : Optoelectronics
(320.7130) Ultrafast optics : Ultrafast processes in condensed matter, including semiconductors
Fuli Zhao, Hongxin Chen, Shaozhi Deng, Ningsheng Xu, Tianqing Jia, and Zhizhan Xu, "Ultrafast blue light emission from SiC nanowires," Chin. Opt. Lett. 5, 184-186 (2007)