【作者】 张辉；

【导师】 董丽敏；

【作者基本信息】 哈尔滨理工大学 ， 材料学， 2009， 硕士

【摘要】 随着场发射（FED）和等离子体（PDP）发光显示技术的发展,对荧光粉的粒度大小、稳定性、发光效率、发光亮度以及导电性等提出了更高的要求。在众多发光材料中,以稀土钒酸盐为基质的发光材料具有良好的化学稳定性和热稳定性。本论文采用溶胶-凝胶法分别以YVO₄、Y（V, P）O4、K_xM_xYVO₄及M₃Y₂（VO4）3为基质,Eu³⁺为激活剂合成了四个体系的红色荧光粉,采用X射线衍射仪（XRD）、扫描电子显微镜（SEM）、表面能谱分析（EDS）等方法对所制备的荧光粉结构和形貌进行研究并系统地研究了其发光性质,以寻求具有高性能、低成本的新型发光材料。首先,利用溶胶凝胶法制备YVO₄:Eu红色荧光粉,探讨烧结温度对晶相、形貌、荧光性能的影响,得出最佳烧结温度为1100℃,研究激活剂浓度对荧光发射强度的影响得出Eu³⁺的最佳掺杂浓度为12%,并在确定Eu³⁺浓度一定时掺杂Bi3+,研究了Bi³⁺对Eu³⁺的敏化作用;其次,合成了Y（V, P）O₄:Eu红色荧光粉,研究了PO₄³⁺的引入对荧光性能的影响,荧光强度对比结果表明:当V:P为6:4时荧光强度最高;再次,从合成具有高性能、低成本荧光粉的角度考虑,合成了K_xM_xYVO₄:Eu³⁺（M=Mg, Ca, Sr）系列荧光粉,结果表明:K和Mg共取代Y的量达25%时不会改变YVO₄的物相结构,采用溶胶-凝胶法合成此系列荧光粉的粒度均匀,其中K_0.25Mg_0.25Y_0.70VO₄:0.05Eu³⁺荧光强度最高。最后,对M₃Y₂（VO₄）₃:Eu（M=Mg, Ca, Sr）系列荧光粉中不同浓度的碱土金属掺杂量对荧光强度的影响进行分析,结果表明:Mg₃Y₂（VO₄）₃:Eu的荧光性能最佳,当掺杂量小于20%时随着掺杂量的增加荧光强度有增强的趋势。更多还原

【Abstract】 With the technical development of FED and PDP, the requirement on the crystal size distribution, stability, luminescence efficiency, brightness and conductivity of the powder has been increasing. Among the large number of luminescent materials, rare-earth vanadate host luminescent materials are well known for their good chemical and thermal stability. In this paper, Four kinds of red phosphor systems based on YVO₄,Y（V, P）O4,KxMxYVO₄ and M3Y2（VO4）3 activated by Eu³⁺ were prepared through sol-gel method. X-ray diffraction, scanning electron microscopy and surface energy spectrum were used to study the phase structure, the morphology, element analysis and the luminescent properties of the phosphor. The paper aims at finding new types of luminescent materials with high-performance and low-cost.Frist, YVO₄:Eu red phosphor was synthesized by sol-gel method. The influence of sintering temperature on crystalline phase, morphology and luminescence were studied. Through analysis, the best sintering temperature was determined to be 1100℃. By studying the impaction of the concentration of activator on the fluorescence emission intensity, it is concluded that the best doping concentration of Eu³⁺ was determined to be 12%. Besides, by doping Bi3+ at a certain concentration of Eu³⁺, Eu³⁺ was found to be sensitized by Bi3+. Second, Y（V, P）O4:Eu red phosphor was synthesized. The fluorescent properties after doping PO43+ were studied. The results of the fluorescence intensity indicate that fluorescence intensity is the highest when V: P is 6:4. A series of KxMxYVO₄:Eu³⁺ （M=Mg, Ca, Sr） phosphor was synthesized, which is more economically effective. The phase structure of YVO₄ does not change when the amount of K and Mg replacing Y reached 25%. This series of phosphor synthesized by sol-gel process has uniform size, among which fluorescence intensity of K_0.25Mg_0.25Y_0.70VO₄:0.05Eu³⁺ is the highest. Finally, the influence of different doping concentration of alkaline earth metal in M₃Y₂（VO4）3:Eu（M=Mg, Ca, Sr） on fluorescence intensity was studied. As a result, the fluorescence intensity increased with the doping quantity before doping amount of M reached 20% and the fluorescence intensity of Mg₃Y₂（VO₄）₃:Eu is the best.更多还原