溶剂热-溶胶凝胶两步法合成(Y,Gd)(P,V)O4: Eu3+,Bi3+荧光粉及其发光研究

Solvent Thermal-Sol Gel Synthesis and Luminescence Properties of (Y,Gd)(P,V)O4:Eu3+,Bi3+ Phosphors

摘要:

采用溶剂热-溶胶凝胶两步法合成了(Y1-z,Gdz)1-x-y(Pz,V1-z)O4: xEu3+,yBi3+系列红色荧光粉。用XRD、SEM和荧光分光光度计，对试样的晶体结构、表面形貌及发光性能进行了表征。结果表明：样品为四方晶系，掺杂离子的加入对基质晶体结构影响不大；样品形貌均一，呈短杆状或椭圆状；激发光谱由位于250~400 nm的O2--V5+带和Eu3+-O2-带组成；最强发射峰位于619 nm，归属于Eu3+的5D0→7F2特征跃迁发射；Eu3+的最佳掺杂量为5 mol% (x=0.05)；掺杂Bi3+、Gd3+、P5+后，样品发射强度得到显著提高，Bi3+的掺杂还会使激发带红移至400 nm。说明这类荧光粉是可用于近紫外芯片激发的白光LED用红色荧光粉

Abstract:

A series of (Y1-z,Gdz)1-x-y(Pz,V1-z)O4: xEu3+,yBi3+ red phosphors have been synthesized by a solvent thermal-sol gel method. The crystal structure, surface morphology and spectral characteristics of the samples were investigated by X-ray diffraction (XRD), SEM and fluorescence spectrophotometer, respectively. It is found that the synthesized crystalline powders are of tetragonal system. The doped ions have little impact on the matrix crystal structure. The sample grains show short rods or elliptical and the structure is uniform and loose. The excitation spectrum is composed of the broadband in 250~400 nm (O2--V5+ band and Eu3+-O2- band). The strongest emission peak locates at 619 nm(Eu3+: 5D0→7F2). The best doping amount of Eu3+ is 5 mol% and the excess concentration will lead to concentration quenching. The co-doping of Bi3+, Gd3+ and P5+ can improve the luminous intensity of the samples significantly. The doping of Bi3+ can make the excitation band move to near 400 nm, indicating samples can match with the N-UV chips and then be used in white-LEDs