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Temperature-dependent PL emission spectra of different QD samples. (a) The 5-layer QD sample, (b) the 10-layer QD sample, (c) the 20-layer QD sample, and (d) the 30-layer QD sample.
Temperature-dependent energy gap variation in the 5-QD sample at various temperatures from 12 to 300 K. The dots are the measurement data from the PL emission. Dashed green and red traces: the energy gap shrinking projected by using the Varshni’s formula and the power function ansatz, respectively. Blue and pink traces: calculated energy gaps by using our models at the low and high temperature regions, which show very good agreement with experiment data.
vs plots for both the 5-layer QD and the 10-layer QD samples. Very good linear relationships between and are found in both the low temperature and the high temperature regions for 5-layer QD and the 10-layer QD samples. The solid lines are the linear curve fittings.
Temperature-dependent equations energy gap for all the QD samples at low and high temperatures.
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