Abstract
The Phase pure wurtzite structured ZnO phosphor was prepared by sintering three different precursors viz. zinc acetate, zinc nitrate, and ZnO at 800 °C, 900 °C, and 1000 °C in a reducing atmosphere for 1 h. The prepared ZnO phosphor samples were characterized by powder X-ray diffraction and the Rietveld refinement analysis in order to study their structural information that confirms their wurtzite hexagonal phase. Scanning electron microscopy (SEM) pictures exhibited irregular spherical morphology with an average particle size between 1 and 3 μm. The corresponding EDAX spectrum confirmed the presence of Zn and O species. Dependence of sintering temperature on the photoluminescence (PL) properties of ZnO samples and their enhancement on deep-level emission were studied. Deep level green emission around 505 nm was observed for the ZnO samples sintered in the reducing atmosphere without adding any impurities. Among three samples, the maximum PL emission intensity and better CIE colour coordinates under 380 nm excitation were obtained for the ZnO sintered at 900 °C and 1000 °C. Maximum Entropy Method (MEM) were used to determine the electron distributions in the unit cell which supports the PL investigation.
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