Ultraviolet lasing and time-resolved photoluminescence of well-aligned ZnO nanorod arrays

Xinhai Han; Guanzhong Wang; Qingtao Wang; Li Cao; Ruibin Liu; Bingsuo Zou; Hou, J. G.
May 2005
Applied Physics Letters;5/30/2005, Vol. 86 Issue 22, p223106
Academic Journal
Well-aligned ZnO nanorod arrays were synthesized by thermal evaporation of ZnO powder on ZnO thin films. The nanorods are almost the same length of 5.5 μm and well-oriented perpendicular to the substrates. The time-integrated and time-resolved photoluminescence spectra of the nanorod arrays revealed the existence of laser action with the excitation threshold of 130 μJ/cm2 and emission lifetime of less than 30 ps. At the excitation fluence a little below threshold, the decay fits well to a biexponential function with a fast component (∼80 ps) and a slower component (∼360 ps).


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