Stimulated emission induced by exciton-exciton scattering in ZnO/ZnMgO multiquantum wells up to room temperature

Sun, H. D.; Sun, H.D.; Makino, T.; Tuan, N. T.; Tuan, N.T.; Segawa, Y.; Tang, Z. K.; Tang, Z.K.; Wong, G. K. L.; Wong, G.K.L.; Kawasaki, M.; Ohtomo, A.; Tamura, K.; Koinuma, H.
December 2000
Applied Physics Letters;12/25/2000, Vol. 77 Issue 26
Academic Journal
The mechanism of ultraviolet stimulated emission was investigated in ZnO/ZnMgO multiquantum wells. Stimulated emission induced by exciton-exciton scattering occurred throughout a range of temperatures from 5 K to room temperature. At temperatures higher than 160 K, stimulated emission due to electron-hole plasma recombination was also observed with a higher excitation threshold than that of exciton-exciton scattering. The exciton binding energies of multiquantum wells were larger than that of bulk ZnO and increased with a decrease in the well widths. This enhancement of exciton binding energy is due to the quantum-confinement effect and is favorable for the stability of exciton states. © 2000 American Institute of Physics.


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