Authors: Yongqing Zhai Meng Wang Qian Zhao Honglei Yang Huanghui Ding
Publish Date: 2015/09/09
Volume: 27, Issue: 1, Pages: 279-285
Abstract
ZnWO4Sm3+ white lightemitting phosphors were prepared by a PEGassisted hydrothermal method followed by calcination The structure morphology and luminescent properties were characterized by Xray powder diffraction scanning electron microscopy and fluorescence spectrophotometer respectively The results showed that the assynthesized ZnWO4Sm3+ samples had monoclinic wolframite structure and were all well crystallized When the PEG was introduced into the reaction system the dispersibility of the particles was improved significantly and the particle size became uniform The emission spectra of ZnWO4Sm3+ consisted of a strong broad bluegreen band of WO4 2− group centered around 467 nm and orangered emission peaks of Sm3+ at 568 613 and 654 nm The hydrothermal temperature amount of PEG and calcination temperature strongly affected the luminescent intensity of ZnWO4Sm3+ ZnWO4Sm3+ phosphors showed strong white lightemitting when the hydrothermal temperature was 180 °C the amount of PEG is 04 g and the calcinations temperature is 700 °C
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