1College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072 2Department of Physics and Astronomy, Northwestern University, Evanston, IL60208 USA
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 (100 ps) 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.
XIANG Wang-Hua, ZHANG Gui-Zhong, SUN Yi, WANG Gang, John. B. Ketterson. Utraviolet Lasing from ZnO Single Crystal at Room Temperature[J]. Chin. Phys. Lett., 2003, 20(2): 296-297.
XIANG Wang-Hua, ZHANG Gui-Zhong, SUN Yi, WANG Gang, John. B. Ketterson. Utraviolet Lasing from ZnO Single Crystal at Room Temperature[J]. Chin. Phys. Lett., 2003, 20(2): 296-297.
XIANG Wang-Hua, ZHANG Gui-Zhong, SUN Yi, WANG Gang, John. B. Ketterson. Utraviolet Lasing from ZnO Single Crystal at Room Temperature[J]. Chin. Phys. Lett., 2003, 20(2): 296-297.
XIANG Wang-Hua, ZHANG Gui-Zhong, SUN Yi, WANG Gang, John. B. Ketterson. Utraviolet Lasing from ZnO Single Crystal at Room Temperature[J]. Chin. Phys. Lett., 2003, 20(2): 296-297.