Ga^(3+)对Mg_(14)Ge_(5)O_(24):Cr近红外发光材料的影响  

Effect of Ga^(3+)on the luminescence property of Mg_(14)Ge_(5)O_(24):Cr near infrared material

作　　者：徐艳梅[1] 秦晓东 梁绍龙 王嘉瑞 王雪骄 王志军[2] XU Yanmei;QIN Xiaodong;LIANG Shaolong;WANG Jiarui;WANG Xuejiao;WANG Zhijun(Department of Mathematics and Physics,North China Electric Power Unversity,Baoding 071003,China;College of Physics Science and Technology,Hebei University,Baoding 071002,China)

机构地区：[1]华北电力大学数理系,河北保定071003 [2]河北大学物理科学与技术学院,河北保定071002

出　　处：《河北大学学报（自然科学版）》2023年第5期463-469,共7页Journal of Hebei University(Natural Science Edition)

基　　金：国家自然科学基金资助项目(51902080,2018MS133);华北电力大学中央高校基金资助项目(2018MS133)。

摘　　要：利用高温固相法合成了Mg_(14)Ge_(5)O_(24):Cr近红外荧光粉,实现了Cr^(3+)和Cr^(4+)价态共存发光.利用XRD和GASA精修软件分析了样品的晶相.该材料存在2个发光中心,一个来自占据八面体Ge^(4+)位置的Cr^(3+),发射带位于近红外一区,半峰宽可达256 nm;另一个源于占据四面体Ge^(4+)位置的Cr^(4+),发射带位于近红外二区,半峰宽可达266 nm.通过低温光谱和寿命衰减曲线分析了材料的发光特性.利用Ga^(3+)代替Ge^(4+)可以实现对Cr^(3+)和Cr^(4+)发光的调控,大半径Ga^(3+)的加入产生了新的格位,从而影响了整体的晶体场强度,获得了近红外一区发光更强烈的荧光粉.Mg_(14)Ge_(5)O_(24):Cr near-infrared(NIR)phosphors were synthesized by the high-temperature solid-phase method to achieve the coexistence of Cr^(3+)and Cr^(4+)valence luminescence.The crystalline phases of the samples were analyzed using XRD and GASA refinement software.The material has two luminescence centers,one from Cr^(3+)occupying the octahedral Ge^(4+)position with an emission band in the NIR I region and a half-peak width up to 256 nm,and the other from Cr^(4+)occupying the tetrahedral Ge^(4+)position with an emission band in the NIR II region and a half-peak width up to 266 nm.The luminescence properties of the material were analyzed by low-temperature spectra and lifetime decay curves.The modulation of Cr^(3+)and Cr^(4+)luminescence can be achieved by using Ga^(3+)instead of Ge^(4+).The addition of large radius Ga^(3+)ions generates new lattice sites,which affects the overall crystal field intensity,and a phosphor with more intense luminescence in the NIR I region is obtained.

关 键 词：发光 近红外 Mg_(14)Ge_(5)O_(24):Cr Ga^(3+) 

分 类 号：O782.31[理学—晶体学]