以荧光强度为指标,采用L9(3^4)正交实验优化纳米荧光粉YPO4:2%Sm^3+的水热工艺条件(反应温度、反应时间、溶液的阴/阳离子比和pH值)。用X射线衍射仪(XRD)、扫描电镜及能谱(SEM and EDS)、荧光分光光度计(FL)、红外光谱仪(FT-IR)和紫外...以荧光强度为指标,采用L9(3^4)正交实验优化纳米荧光粉YPO4:2%Sm^3+的水热工艺条件(反应温度、反应时间、溶液的阴/阳离子比和pH值)。用X射线衍射仪(XRD)、扫描电镜及能谱(SEM and EDS)、荧光分光光度计(FL)、红外光谱仪(FT-IR)和紫外光谱仪(UV)等仪器对样品的组成、结构、形貌及其发光性能进行了表征和分析。结果表明,影响纳米荧光粉YPO4:2%Sm^3+水热工艺条件的主次因素为反应温度>pH值>反应时间>阴/阳离子比。最佳的水热工艺条件为反应温度为200℃、pH=3、反应时间为12 h、阴/阳离子比3:1。最佳纳米荧光粉的结构为单一的四方晶体结构,形貌为纳米球,荧光强度最大,荧光寿命为0.1719ms,禁带宽度为5.14 eV,色坐标为X=0.556 3, Y=0.433 9。展开更多
The blue-emitting YPO4 phosphors doped with Yb3＋ were prepared by a simple hydrothermal method. All the products were characterized by XRD and TEM, which revealed that they were zircon structure with leaf-like morpho...The blue-emitting YPO4 phosphors doped with Yb3＋ were prepared by a simple hydrothermal method. All the products were characterized by XRD and TEM, which revealed that they were zircon structure with leaf-like morphology. According to the analysis of photoluminescence spectra, upon ultraviolet （275 nm） excitation, the Yb3＋ doped YPO4 phosphor showed an intense blue emission composed of two main bands at 420 and 620 nm assigned to charge transfer state （CTS） → 2Fs/2 and CTS →ZF7/2, respectively. Moreover, the optimum doping concentration of Yb3＋ in YPO4 phosphor was 1%, which exhibited the maximum emission intensity. The possible physical mechanism of concentration quenching was discussed, and the critical transfer distance determined to be 23.889 A. In particular, the color purity of the as-synthesized Yb3＋ doped YPO4 phosphor was as high as 83%, which made it an excellent candidate for blue-emitting materials.展开更多
文摘The blue-emitting YPO4 phosphors doped with Yb3＋ were prepared by a simple hydrothermal method. All the products were characterized by XRD and TEM, which revealed that they were zircon structure with leaf-like morphology. According to the analysis of photoluminescence spectra, upon ultraviolet （275 nm） excitation, the Yb3＋ doped YPO4 phosphor showed an intense blue emission composed of two main bands at 420 and 620 nm assigned to charge transfer state （CTS） → 2Fs/2 and CTS →ZF7/2, respectively. Moreover, the optimum doping concentration of Yb3＋ in YPO4 phosphor was 1%, which exhibited the maximum emission intensity. The possible physical mechanism of concentration quenching was discussed, and the critical transfer distance determined to be 23.889 A. In particular, the color purity of the as-synthesized Yb3＋ doped YPO4 phosphor was as high as 83%, which made it an excellent candidate for blue-emitting materials.
