Na＋,Li＋,Bi3＋掺杂CaWO4∶Eu3＋荧光粉的制备及发光特性  

Preparation and Luminescence Properties of Na^+,Li^+,Bi^(3+) Doped CaWO_4∶ Eu^(3+) Phosphors

作　　者：王林香[1,2,3] 

机构地区：[1]新疆师范大学物理与电子工程学院,乌鲁木齐830054 [2]新疆矿物发光及其微结构重点实验室,乌鲁木齐830054 [3]新型光源与微纳光学重点实验室,乌鲁木齐830054

出　　处：《高等学校化学学报》2018年第1期25-31,共7页Chemical Journal of Chinese Universities

基　　金：新疆维吾尔自治区自然科学基金(批准号：2017D01A60); 新疆师范大学新型光源与微纳光学重点实验室项目(批准号：XJNUSYS092017B04)资助~~

摘　　要：采用微波辅助加热法合成了Na^+,Li^+,Bi^(3+)掺杂的CaWO_4∶Eu^(3+)荧光粉.利用X射线衍射仪和扫描电子显微镜对样品的微观结构进行了表征,利用荧光分光光度仪对样品的激发光谱、发射光谱和能级寿命进行了测试和分析.结果表明,掺杂浓度(摩尔分数)均为3.75%的Eu^(3+),Na^+,Li^+,Bi^(3+)掺杂的CaWO_4均保持了基质的四方晶相结构.Na^+,Li^+,Bi^(3+)单掺杂或共掺杂后的样品比CaWO_4∶Eu^(3+)样品颗粒度分别有不同程度的增加.在393 nm光激发下,掺杂Eu^(3+),Na^+及掺杂Eu^(3+),Li^+样品的发光强度比CaWO_4∶Eu^(3+)的发光强度分别提高了1.8倍和1.2倍,共掺杂Eu^(3+),Li^+,Na^+及Eu^(3+),Li^+,Bi^(3+)的样品发光均有所减弱.在254和393 nm光激发下,掺杂Li^+的CaWO_4∶Eu^(3+)样品的荧光寿命最短.同一样品在393 nm光激发下的荧光寿命短于254nm光激发下的荧光寿命.Na~＋,Li~＋,Bi^（3＋）doped CaWO_4∶ Eu^（3＋）phosphors were synthesized by microwave-assisted heating solid state reaction method. The microstructures of the sampless were characterized by XRD and SEM. The excitation spectra, emission spectra and energy levels of the samples were detected and analyzed by fluorescence spectrophotometer. The results showed that the samples all kept the tetragonal matrix. Compared with the particle size of CaWO_4∶ Eu^（3＋）phosphor,the size of Na~＋,Li~＋,Bi^（3＋）doped or codoped CaWO_4∶ Eu^（3＋）phosphors all increased. Under 393 nm excitation,the luminescence intensities of samples doped with Na~＋and Li~＋are 1. 8 and 1. 2 times that of undoped these ions,and the luminescence intensities all decreased for the sample codoped with Li~＋,Na~＋and the sample codoped with Li~＋,Bi^（3＋）. Under 254 and 393 nm excitation,the lifetime of the sample doped with Li~＋was the shortest in all samples. For the same sample,the energy level lifetime under the 393 nm excitation was shorter than that under the 254 nm excitation.

关 键 词：微波辅助加热法 CaWO4∶Eu3+ 发光特性 能级寿命 

分 类 号：O611.4[理学—无机化学]