Funct. Mater. 2016; 23 (4): 535-539.
X-ray and photo-excited luminescence of ZnWO4 nanoparticles with different size and morphology
1 Institute for Scintillation Materials, STC Institute for Single Crystals, National Academy of Sciences of Ukraine, 60 Nauky Ave., 61001 Kharkiv, Ukraine
2Institute for Single Crystals, STC Institute for Single Crystals, National Academy of Sciences of Ukraine, 60 Nauky Ave., 61001 Kharkiv, Ukraine
X-ray and photoluminescence of ZnWO4 nanocrystals with controlled size and morphology: grains with diameter of 10-20 nm; rods with diameter of 10-20 nm and length of 200-250 nm produced by microwave hydrothermal method were studied. Red luminescence with λmax = 700 nm was found in the samples. The intensity of the red luminescence increases with decreasing of the ZnWO4 nanoparticles size due to increase of concentration of oxygen vacancies and creation of distorted WO6 centers. It was shown that reduction in the X-ray luminescence intensity with decrease of the ZnWO4 nanoparticles size is due to creation of the distorted WO6 centers which are the nonradiative relaxation channel competing with the self-trapped excitons.
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