Browsing by Author "Hu, Y. M."

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Biexciton emission from sol-gel ZnMgO nanopowders
(2010-05-10)
Chia, C. H.
;
Lai, Y. J.
;
Hsu, W. L.
;
Han, T. C.
;
Chiou, J. W.
We studied the power-dependent photoluminescence of Zn(1-x)Mg(x)O nanopowders grown by sol-gel method, at temperature T = 100 K. At moderate optical pumping intensity, a nonlinear emission band due to the radiative recombination of free biexcitons was detected. We found that the free biexciton binding energies of Zn(1-x)Mg(x)O nanopowder (0.01 <= x <= 0.05) are nearly constant (13.5 +/- 1.5 meV). (C) 2010 American Institute of Physics. [doi:10.1063/1.3428780]
High-excitation effect on photoluminescence of sol-gel ZnO nanopowder
(2010-02-22)
Chia, C. H.
;
Lai, Y. J.
;
Han, T. C.
;
Chiou, J. W.
;
Hu, Y. M.
We studied the power-dependent photoluminescence of ZnO nanopowder grown by sol-gel method at low temperature. At moderate optical pumping intensity, two nonlinear emission bands due to the radiative recombination of free biexciton and the inelastic exciton-exciton scattering were detected. We found that the threshold of the excitation density for the emergence of the nonlinear emission bands is low (< 18 W/cm(2)) in sol-gel ZnO nanopowders.