La_(1-x)YO_3∶xPr^(3+)荧光粉的溶液燃烧法合成及发光特性  

Photoluminescence Properties and Preparation of La_(1-x)YO_3∶xPr^(3+) Phosphors by Solution-combustion

作　　者：伏振兴[1] 刘碧蕊[1] 

机构地区：[1]宁夏师范学院物理与信息技术学院,宁夏固原756000

出　　处：《光子学报》2015年第8期133-136,共4页Acta Photonica Sinica

基　　金：宁夏自然科学基金(No.NZ13208);宁夏留学人员创新创业择优资助项目(No.[2014]486-4);宁夏高校科研项目(No.NGY2013112);宁夏师范学院科研项目(Nos.NXSFZD1513;NXSFYB1537)资助

摘　　要：为了研究紫外光作用下La1-xYO3∶xPr3+荧光粉的光致发光特性和发光机理,以尿素为辅助燃烧原料,采用溶液燃烧合成法,制备了不同掺杂浓度的La1-xYO3∶xPr3+荧光粉样品.通过X-射线衍射、扫描电子显微镜和光谱学手段,对La1-xYO3∶xPr3+荧光粉的晶相结构、形貌和发光性质进行了表征和研究.结果表明,所制备的LaYO3∶Pr3+样品具有立方晶形结构,在波长为295nm紫外光源的激发下,荧光粉发射出很强的绿色荧光.随着Pr3+离子掺杂浓度的增加,荧光粉的绿色发光强度也随之增强.当掺杂浓度增至1.0mol%时,其绿色发光强度达到最大.之后,随着Pr3+离子掺杂浓度的进一步增加,荧光粉的绿色发光强度开始逐渐减弱,出现浓度猝灭效应.In order to investigate the mechanism and properties of photoluminescence of La1-xYO3∶xPr3＋phosphors,the phosphors with various doping concentration were synthesized via a urea assisted solutioncombustion method.The phosphors were characterized by X-ray powder diffraction,field emission scanning electron microscope and photoluminescence,respectively.The results show that the samples exhibit a cubic phase in crystal structure,and the strong green luminescence is emitted from La1-xYO3∶xPr3＋phosphors under an excitation of ultraviolet light at 295 nm.The intensity of green photoluminescence emission is increased with the increasing of praseodymium concentration.Then it is decreased at higher concentration due to the concentration quenching effect.The optimum doping concentration of Pr3＋ions is about 1.0 mol% for attaining the strongest green photoluminescence emission.

关 键 词：荧光光谱 绿色荧光粉 光致发光 La1-xYO3∶xPr3+ 溶液燃烧合成法 发光机理 浓度效应 

分 类 号：O482.31[理学—固体物理] O782.1[理学—物理]