Abstract
We experimentally studied ultraviolet photoluminescence (PL) from ZnO (0001) single crystal at room temperature. The PL spectra taken from the sample edge show spectral width narrowing; lifetime shortening (100ps) and super linear intensity increase with pumping power, while the PL spectra taken from the sample surface only show broad spontaneous emission with a much longer lifetime (> 5 ns). These findings suggest that stimulated emission and lasing were only achieved at edges of the ZnO single crystal. Scanning-electron-microscopic images show a smooth sample surface morphology and a rougher morphology at the single crystal edge. Electron-hole plasma enhancement of gain may be attributed to the lasing effect observed from the sample edge.
Original language | English (US) |
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Pages (from-to) | 296-297 |
Number of pages | 2 |
Journal | Chinese Physics Letters |
Volume | 20 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2003 |
ASJC Scopus subject areas
- Physics and Astronomy(all)