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TA spectra at the delay times of 5 ps and 2 ns. Drude-like curve is shown for guide to the eye. The inset shows the linear absorption spectra of nondoped , and Nb-doped (0.02 and 0.1 mol %).
TA decay dynamics of nondoped at different excitation densities of (1) , (2) , (3) , and (4) . The inset shows the temporal evolution of optical density change at excitation density in the nanosecond time region.
(a) PL decay dynamics under excitation of (1) , (2) , (3) , and (4) in the subnanosecond time region. The inset shows the PL decay dynamics under excitation of . (b) The excitation density dependence of the PL intensity just after excitation. The inset shows a typical PL spectrum of .
Excitation-density dependence of the decay times derived from TA and PL decay curves. The solid curves show the fitting results using Eq. (2).
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