(Color online) Excitation-energy dependence of the PL intensity in the d = 40 and d = 20 nm samples (Ref. 12). The dotted curves indicate the PL spectra of the spacer layer.
(a) Excitation-energy dependence of the PL decay profiles in the d = 40 nm sample. Detection energy is the PL peak energy of the sample. Excitation energy at 1.90 eV corresponds to the excitation of higher states. (b) PL decay time plotted as a function of excitation energy.
Excitation-density dependence of the PL decay time in the d = 40 nm sample.
Detection-energy dependence of the PL decay time. Closed and open circles indicate the results for excitation at 1.90 and 1.55 eV, respectively.
(Color online) Numerical simulation of the PL decay profiles described by Eq. (3). (a) For various C 2 under γ 1 < γ 2, (b) for various C 2 under γ 1 > γ 2, and (c) for various γ 2 under C 1 = C 2. Open circles represent the numerically reproduced experimental results.
PL decay time evaluated by fitting with a single exponential function form plotted as a function of excitation energy in the d = 20 nm sample. The detection energy is the PL peak energy.
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