Y_(2)O_(2)SO_(4):Eu^(3+)亚微米棒的合成及发光性能

Synthesis and Luminescent Properties of Y_(2)O_(2)SO_(4):Eu^(3+) Sub-micron Rods

以Na_(2)SO_(4)和K_(2)SO_(4)为熔盐,采用熔盐法合成了一维Y_(2)O_(2)SO_(4):Eu^(3+)亚微米棒。应用X射线衍射、扫描电子显微镜和光谱仪等方法对合成产物的晶体结构、形貌和发光性能进行表征。考察了烧结温度、Eu^(3+)掺杂浓度对合成产物的晶体结构、形貌和发光性能的影响。结果表明,原料混合物在1100℃空气中煅烧2 h可合成纯相、表面光滑的Y_(2)O_(2)SO_(4):Eu^(3+)亚微米棒,Y_(2)O_(2)SO_(4):Eu^(3+)亚微米棒的长度大于10μm,宽度为500~800 nm。在270 nm紫外光的激发下,Y_(2)O_(2)SO_(4):Eu^(3+)亚微米棒呈红光发射,最强发射峰位于616 nm处,归属于Eu^(3+)的^(5)D_(0)→^(7)F_(2)跃迁,Y_(2)O_(2)SO_(4):Eu^(3+)亚微米棒Eu^(3+)的最佳掺杂浓度为10mol%。

One-dimensional Y_(2)O_(2)SO_(4):Eu^(3+) sub-micron rods were synthesized by a facial molten-salt method with Na_(2)SO_(4) and K_(2)SO_(4) as the eutectic melt. The crystallography, morphology and luminescence properties of as-synthesized products were characterized by X-ray powder diffraction(XRD), scanning electronic microscope(SEM) and photoluminescence(PL) spectra. The influence of the sintering temperature and Eu^(3+) doping concentration on the crystallography, morphology, and luminescence properties of the samples was investigated. The results show that pure Y_(2)O_(2)SO_(4):Eu^(3+) can be prepared by calcining the raw material mixture at 1100 ℃ for 2 h in air. The monoclinic Y_(2)O_(2)SO_(4):Eu^(3+)(10 mol%) sub-micron rods have a length more than 10 μm and a width of 500~800 nm. The photoluminescence spectra of the Y_(2)O_(2)SO_(4):Eu^(3+) sub-micro rods confirm the strongest red emission peak at 616 nm upon the excitation of 270 nm ultraviolet light, which corresponds to the ^(5)D_(0)→^(7)F_(2) transition of Eu^(3+). Moreover, the quenching concentration mechanism of Y_(2)O_(2)SO_(4):Eu^(3+) samples with Eu^(3+) above 10 mol% was also discussed.