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(a) Linear absorption at and PL spectrum for . (b) Experimental results for the temperature dependent PL peak position at various excitation intensities.
Hopping on two energy scales. The first one is given by a Gaussian distribution with the characteristic energy scale and the second scale is given by an exponential distribution with energy scale , representing alloy disorder and cluster localization, respectively.
Left: Experimental Stokes shift (a) and FWHM (c) for varying excitation powers. Right: Calculated Stokes shift (b) and FWHM (d) for varying using the two-scale model. Energy scales of and are obtained. The inset in (b) shows experimental (gray area) and theoretical (black line) PL spectra for the temperatures of 10 and 110 K at the excitation density of 1 mW.
Temperature dependence of the PL intensity. The solid lines represent the simulation and squares/dots show the measured normalized PL intensity for and excitation power (lower curve), and and (upper curve).
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