Abstract
Emission properties of ZnO nanorods and nanocrystals after high-temperature annealing in air and irradiation with high-intensity solar radiation have been studied. As-synthesized nanorods and nanocrystals under UV radiation exhibit a luminescence with maxima at around 380-384 and 560-570 nm. In both nanostructures, after heat treatment and irradiation with high-intensity solar radiation, an increase in the intensities of the short-wavelength luminescence bands is observed. In addition, after heat treatment and irradiation, in nanorods the long-wavelength luminescence band vanishes, while a new band at 520 nm appears in the luminescence spectrum of the nanocrystals. Irradiation with solar radiation has a greater effect on the emission properties of nanorods than nanocrystals and it is possible, caused by predominantly radiation heating (annealing) of nanorods than nanocrystals.
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