Excitonic gain and stimulated ultraviolet emission in nanocrystalline zinc-oxide powder

Sun, Y.; Ketterson, J. B.; Ketterson, J.B.; Wong, G. K. L.; Wong, G.K.L.
October 2000
Applied Physics Letters;10/9/2000, Vol. 77 Issue 15
Academic Journal
We have studied ultraviolet photoluminescence from high-purity zinc-oxide powder over a wide temperature range (2-293 K). At low temperatures, the spontaneous emission is due to radiative recombination of excitons bound to donors and acceptors. At high temperature (>90 K), it mainly consists of recombination of free excitons, with exciton-exciton collision-induced recombination dominating the spectrum at higher pumping intensities. Emission from the exciton-exciton collision process shows clear stimulated-emission behavior. At sufficiently high pumping intensity, the stimulated emission band shifts abruptly to a longer wavelength due to the formation of an electron-hole plasma. Sharp emission peaks are observed in the stimulated emission bands. The possible origins of these sharp peaks are discussed. © 2000 American Institute of Physics.


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