[(a) and (b)] SEM images of ZNRs and ZNTs with average diameter of 120 nm; [(c) and (d)] SEM images of ZNRs and ZNTs with average diameter of 280 nm. (e) TEM image of ZNTs average diameter of 280 nm. (f) HRTEM images corresponding to the region marked by the dotted box in (e).
(a) Room temperature PL spectra of ZNRs and ZNTs. (b) Room temperature TRPL spectra of ZNRs and ZNTs.
Sketch of the energy band of the ZNRs and ZNTs with different type of surface depletion region. (a) ZNRs is partially depleted (b) ZNTs is thoroughly depleted.
Temperature-dependent PL spectra for (a) ZNRs and (b) ZNTs.
Temperature-dependent photon energy of and . Inset is the energy difference between and .
Reciprocal temperature-dependent entire intensities of the ZNRs and ZNTs. The formulas and the solid lines in the figure are the result of simulation.
Temperature-dependent TRPL spectra of ZNRs (a) and ZNTs (b). All the logarithmic decay behaviors have been fitted by a single exponential function of . The solid lines in the figure are the fitting curves.
The fitted decay time constants from ZNRs and ZNTs as a function of temperature.
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