水热法制备NaY(WO_(4))_(2)∶Eu^(3+)荧光粉及其上转换发光性能研究

Hydrothermal synthesis and upconversion luminescence property of NaY(WO_(4))_(2)∶Eu^(3+) phosphor

采用水热法合成出NaY(WO_(4))_(2)∶Eu^(3+)荧光粉。研究了水热反应时间对样品晶体结构、形貌及上转换发光性能的影响。结果表明:水热反应6h后所得样品均属四方相,且掺入的Eu^(3+)进入到基质NaY(WO_(4))_(2)晶格中,并占据Y^(3+)的格位。添加聚乙二醇(PEG-2000)作为表面活性剂,可得到形貌统一且分散性良好的微米针状球。利用790nm近红外光激发样品,获得了595nm橙光和616nm红光发射峰,其中橙光发射来自Eu^(3+)的^(5)D_(0)→^(7)F_(1)跃迁,红光由Eu^(3+)的^(5)D_(0)→^(7)F_(2)跃迁产生。

Eu^(3+) doped NaY(WO_(4))_(2) phosphors were prepared via hydrothermal process.The effect of hydrothermal reaction time on the crystal structure,morphology and upconversion luminescence properties were investigated.Analysis results showed that the synthesized samples were tetragonal phase NaY(WO_(4))_(2) after the hydrothermal reaction reached 6 h,and Eu^(3+) were successfully introduced into the lattice and replaced Y^(3+) site.The micrometer-sized needle spheres with uniform morphology and excellent dispersion by adding polyethylene glycol(PEG-2000) as surfactant.Under 790 nm excitation NaY(WO_(4))_(2)∶Eu^(3+) can observed 595 nm orange and 616 nm red emission peak.Orange emitting lights were from the transition of ^(5)D_(0)→^(7)F_(1) of Eu^(3+),red emitting lights resulted from the energy level transition of ^(5)D_(0)→^(7)F_(2) of Eu^(3+).