摘要
We report the femtosecond time-resolved studies of room temperature exciton recombination and ultrafast stimulated emission dynamics in ZnO microcrystallite thin films.A free exciton photoluminescence lifetime of a few tens of picoseconds and a decay time of a few picoseconds for the stimulated emission were observed.The relatively slow rise time(3ps)for the P band as the result of exciton-exciton scattering compared with the 0.8ps rise time for the N band attributed to electron-hole plasma recombination clearly distinguished the two stimulated emission processes.
作者
ZHANG Wei-li
CHAI LU
XING Qi-rong
WANG Qing-yue
KSWong
Ping Yu
HWang
ZKTang
GKL
Wong
张伟力;柴路;邢岐荣;王清月;K.S.Wong;Ping Yu;H.Wang;Z.K.Tang;G.K.L.Wong(Ultrafast Laser Laboratory,School of Precision Instruments&Optoelectronics Engineering,and Optoelectronic Information Science and Technology Laboratory;School of Science,Tianjin University,Tianjin 300072;Department of Physics,The Hong Kong University of Science and Technology,Clear Water Bay,KowJoon,Hong Kong)
基金
Supported by the National Natural Science Foundation of China under Grant No.69608002
the Excellent Young Teacher's Foundation of the Minis try of Education.
