论文部分内容阅读
采用高温固相反应法制备了La2O2S∶Tb3+、La2O2S∶Tb3+,RE3+(RE=Dy,Gd,Ce,Sm)荧光粉样品并进行了相关表征。结果表明,合成样品的晶体结构与La2O2S相同,为六方晶系;荧光粉颗粒的形貌多为长方形片状;发射光谱由494 nm、545 nm、587 nm、622 nm的一系列锐发射峰组成。研究发现Tb3+的掺杂浓度对样品主发射峰545 nm的发光强度影响很大,且在摩尔分数x(Tb3+)=0.02时达到最强。稀土离子Dy3+、Gd3+对La2O2S∶Tb3+荧光粉的发光有明显的敏化作用。
La2O2S:Tb3 +, La2O2S:Tb3 +, RE3 + (RE = Dy, Gd, Ce, Sm) phosphor powders were prepared by high temperature solid-state reaction and characterized. The results show that the crystal structure of the synthesized sample is the same as that of La 2 O 2 S and hexagonal. The morphology of the phosphor particles is rectangular and the emission spectrum is composed of a series of sharp emission peaks at 494 nm, 545 nm, 587 nm and 622 nm . The results show that the doping concentration of Tb3 + has a great effect on the luminescence intensity at 545 nm of the main emission peak of the sample, and reaches the maximum at a molar fraction of x (Tb3 +) = 0.02. The rare earth ions Dy3 + and Gd3 + have obvious sensitization on the luminescence of La2O2S:Tb3 + phosphor.