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The SEM image of annealed sample showing the existence of nanosized ZnO grains.
Room temperature TIPL spectra measured before the EHP formation showing the sharp lasing modes due to the exciton-exciton scattering.
The evolution of SE spectrum with excitation intensity, while the inset shows the spectrally integrated PL intensity as a function of excitation intensity.
(Color online) Time evolution of SPE and SE measured at room temperature. The decay trace of SPE at is also plotted for comparison.
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