导　　师： 余林

学科专业： 081704

授予学位： 硕士

作　　者： ;

机构地区： 广东工业大学

摘　　要： 本文采用溶胶-凝胶法制备了SrAl2O4:Eu2+,Dy3+纳米长余辉发光材料,应用正交试验,确定最佳工艺条件。研究了烧结温度、铝鍶比和硼酸分数对基质晶相的影响。利用XRD,光谱分析等手段对样品进行结构和性能分析。 采用燃烧法制备了SrAl2O4:Eu2+,Nd3+纳米长余辉发光材料,通过正交试验,确定了最佳工艺条件。讨论了铝鳃比、硼酸量对样品晶体结构的影响。同时对其发射光谱蓝移机理和余辉特性作了探讨 研究了不同辅助激活剂RE3+对SrAl2O4:Eu2+发光性能的影响。结果发现改变辅助激活剂,样品发射光谱的蓝移不同,初始亮度也表现出递变规律。进入晶格中的Eu2+浓度差异的影响,致使发光强度递变；RE3+离子半径的差异,造成晶格收缩程度不同,因而发射峰蓝移位置就不同。辅助激活剂不同,陷阱的密度和深度各有差别,导致初始亮度递变；对于同种辅助激活剂,陷阱的密度影响了其余辉性能。 以燃烧法合成了CaAl2O4:Eu2+,Nd3+, RE3+紫色长余辉发光材料。实验结果表明,掺杂辅助激活剂Pr3+和Ce3+对CaAl2O4:Eu2+,Nd3+磷光体发光性能有明显影响。掺杂Pr3+的CaAl2O4:Eu2+,Nd3+样品的发射峰蓝移；掺杂Ce3的CaAl2O4:Eu2+,Nd3+样品的发射峰红移。Pr3+或Ce3+掺杂,可以提高CaAl2O4:Eu2+,Nd3+磷光体的初始亮度,Pr3+或Ce3+在其中起到增加陷阱密度,提高发光亮度的作用。 Long-lasting phosphorescence SrAl2O4:Eu2+,Dy3+nanoparticles were synthesized through Sol-Gel method,and their optimal technological condition were determined by orthogonal experiments.Effects of sintering temperatures. Al//Sr ratio and H3BO3mole fraction, on host crystalline phases were researched.The structure and properties of samples were analyzed by XRD,Excitation spectrum, Emission spectrum. Eu2+and Nd3+activated SrAl2O4nano phosphors with long persistence has been synthesized by combustion method,and the best preparation conditions were obtained.The effects of Al//Sr ratio and H3BO3content on the sample crystalline were discussed. At the same time,the afterglow property and the mechanism of emission spectra blue shift were investigated. Influences of various auxiliary activator RE3+on the luminescence property of SrAl2O4: Eu2+were researched. The results revealed that the blue shift of emission spectra of the samples was different by changes of assistant activator, and the initial brightness of samples showed also graded law. The change of Eu2+concentration entering the lattice arouses the obvious change of luminescence intensity of the phosphor. Because of the different of RE3+ionic radius, the lattice shrinkage degree was different, therefore blue shift of the peak position in emission spectra was also different. Due to the difference of assistant activator, the densities and depth of electrons traps or holes one was diverse, making the initial brightness of samples changing. The traps density of the phosphor affected its afterglow properties for the same auxiliary activator. Eu2+、Nd3+and RE3+doped calcium aluminate phosphors with high brightness and purple long afterglow arc synthesized by combustion method. The experimental results showed that assistant activator Pr3+and Ce3+dopant has significant effect on the persistent luminesce CaAl2O4:Eu2+,Nd3+phosphors.The emission peaks of CaAl2O4:Eu2+,Nd3+samples doping Pr3+were blue-shifted,and ones of CaAl2O4:Eu2+,Nd3+samples doping Ce3+red shifted. Pr3+or Ce3+dopant could increase the initial brightness of CaAl2O4:Eu2+,Nd3+phosphors,and they may play the role of enhancing the trap density and improving luminescent strength in it.

关 键 词： 铝酸盐 长余辉发光 溶胶 凝胶法 燃烧法 激活剂

分 类 号： [TQ422]

领　　域： [化学工程]