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(Color online) Low-temperature photoluminescence spectra of ZnO powders for excitation density of .
(Color online) Excitation power dependence of external quantum efficiency for unannealed and annealed (with and without sulfur) ZnO powders.
(Color online) Excitation power dependence for the near band edge (UV) and defect (GR) spectral components of the photoluminescence for the annealed sample. The values indicate the power scaling exponents.
(Color online) Temperature quenching of the integrated near band edge (UV) and defect (GR) photoluminescence bands for the annealed sample. The thermal activation energy from an Arrhenius fit (dotted curve) of the GR PL intensity quenching is .
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