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Lasing emission spectra of samples A (a), B (b), and C (c) in UV and visible regions. For each sample, the spectra are taken under the same excitation intensity (sample A: equivalent to ; sample B: equivalent to ; sample C: equivalent to ). The inset of (c) shows the discrete UV lasing peaks of sample C excited at .
(a) Light-light curves of UV and visible lasings and (b) the corresponding emission spectra with different excitation intensities.
(a) Schematic to describe the transition characteristics of samples A (i), B (ii), and C (iii) at UV and visible emissions. (b) PL spectra of sample A before and after annealing excited by continuous wave He–Cd laser at .
Lasing spectra of ZnO films annealed at different temperatures. (a) 900, (b) 1000, and (c) . (d) Lasing spectrum of ZnO nanobelts. For each sample, the spectra are taken under the same excitation intensity. The inset in Fig. 5(d) shows the scanning electron microscopy image of the nanobelt morphology.
FT spectra obtained from the lasing emission spectra given in Fig. 1(a) at excitation intensity of (equivalent to ). The inset shows the variation in of visible lasing at different excitation intensities (, , and ).
Lasing characteristics of samples A, B, and C.
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