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PL spectrum measured at , photon energy of , and incident power of . Transition energies for , , and are determined to be 3.448, 3.40, 3.358, and , respectively.
Shift of transition energy as a function of temperature for four PL peaks under the pump power of and at a photon energy of . Solid curves correspond to fitting achieved by using the Varshni relation.
PL intensity integrated over bound-exciton transition peak vs average pump power. The inset illustrates ASPL when the sample was excited at with an average power of .
Temperature dependence of PL spectra for a pump photon energy of and a pump power of . Inset: Arrhenius fit to integrated PL intensity vs reciprocal of temperature.
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