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cw-PL spectra measured at various crystal temperatures. The inset shows the temperature dependence of the full width at half maximum for the ground state emission .
Normalized ground state PL transient vs time at various temperatures. The inset displays the temperature dependence of the decay time. The continuous line represents the best fit obtained by the Arrhenius plot.
Time resolved photoluminescence for the first excited state as a function of the excitation power density at . The inset shows the power dependence of the weights of the fast and slow components.
Topmost plot: whole PL spectrum of the sample obtained at room temperature and with the maximum power intensity . Lower plot: time resolved PL measurements at different detection energies. The dotted line is a guide for eyes.
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