Abstract
We experimentally studied ultraviolet photoluminescence (PL) from ZnO(0001) single crystal at room temperature. The PL spectra taken from thesample edge show spectral width narrowing; lifetime shortening (100 ps)and super linear intensity increase with pumping power, while the PLspectra taken from the sample surface only show broad spontaneousemission with a much longer lifetime (>5 ns). These findings suggestthat stimulated emission and lasing were only achieved at edges of theZnO single crystal. Scanning-electron-microscopic images show a smoothsample surface morphology and a rougher morphology at the single crystaledge. Electron-hole plasma enhancement of gain may be attributed to thelasing effect observed from the sample edge.
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