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(a) spectra obtained from the Zn-polar, O-polar, and interfacial regions in the PPI ZnO structure which is conducted at 77 K. (b) Temperature dependence of the luminescence of PPI ZnO.
(a) PL, (b) nonlinear, and (c) stimulated emission images from the PPI ZnO structures with the 325 nm (a) and 355 nm [(b) and (c)] excitation sources. The inset shows the measurement geometry of stimulated emission (c). The position for the linear and nonlinear PL is in the normal direction to the sample surface [(a) and (b)].
The spectra of [middle (violet) and bottom (blue) lines] and stimulated emission [top (red) line] from 1D PPI ZnO structures observed at room temperature. Note that the difference between the EHP emission and FX emission is 60 meV which corresponds to the binding energy of exciton.
(a) XRD rocking curves of (0002) ZnO and (b) LT PL spectra of PPI ZnO grown on [gray (red) line] and (black line), respectively.
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