摘要
采用溶胶-凝胶燃烧法合成了不同Sr2+掺杂浓度的Ca0.5-xWO4∶Eu3+0.25Li+0.25Sr2+x(x=0,0.05,0.10,0.15,0.20,0.25)红色荧光粉,分别采用X射线衍射(XRD)、扫描电镜(SEM)和荧光分光光度计对荧光粉的结构、微观形貌和发光特性进行表征。结果表明,在500℃低温下煅烧4 h可得到纯白钨矿结构的Ca0.5WO4∶Eu3+0.25Li+0.25荧光粉,且荧光粉的颗粒随着煅烧温度的升高而增大,800℃合成的晶粒尺寸比较均匀,平均粒径在1~2μm左右。Ca0.5-x WO4∶Eu3+0.25Li+0.25Sr2+x系列荧光粉均可以被393 nm和464 nm有效激发,其发射主峰值位于615 nm,属于Eu3+的5D0→7F2跃迁。同时还系统研究了Sr2+的不同掺杂浓度对荧光粉发光性能的影响。Ca0.5-xWO4∶Eu3+0.25Li+0.25Sr2+x荧光粉中Sr2+的最佳掺杂浓度为x取0.15。
A series of Ca0. 5- xWO4∶ Eu3 ＋0. 25Li＋0. 25Sr2 ＋x（ x = 0,0. 05,0. 10,0. 15,0. 20,0. 25） red phosphors for white LEDs were synthesized by sol-gel combustion method. The crystal structure,microstructure and luminescence properties of the samples were characterized by X-ray diffraction（ XRD）,scanning electron microscopy（ SEM） and photoluminescence（ PL）,respectively. The results of XRD and SEM show that the pure phase Ca0. 5WO4∶ Eu3 ＋0. 25Li＋0. 25 with sheelite structure can be obtained at 500 ℃ for 4 h. The radius of particles increases as the temperature increasing. Uniform particle size can be obtained at 800 ℃ and the average particle size is about 1-2 μm. The phosphors can be effectively excited by near-UV（ 393 nm） and blue light（ 464 nm）. The major peak is located at 615 nm attributing to the5D0→7F2transition of Eu3 ＋. In addition,the influence on the luminescence of Sr2 ＋ion doped in Ca0. 5- xWO4∶ Eu3 ＋0. 25Li＋0. 25Sr2 ＋xphosphors was systematically studied. The results show that the optimum doping concentration of Sr2 ＋in Ca0. 5- xWO4∶ Eu3 ＋0. 25Li＋0. 25Sr2 ＋xis equal to 0. 15.
出处
《人工晶体学报》
EI
CAS
CSCD
北大核心
2014年第11期2780-2785,2810,共7页
Journal of Synthetic Crystals
基金
中央高校基本科研业务费专项资金(JB141402)
作者简介
贺文文（1987-），女，陕西省人，硕士。E-mail：wulixihewenwen@163．com
通讯作者：李桂芳，博士，副教授。E-mail：gfli@mail．xidian．edu．cn
