Li_(4)SrCa(SiO_(4))_(2)∶Eu^(3+)红色荧光粉的合成及其发光性能  

Synthesis and Luminescence Properties of Li_(4)SrCa(SiO_(4))_(2)∶Eu^(3+) Red Phosphor

作　　者：樊霞霞 高志翔[1] 屈文山[2] 田翠锋[1] 李建刚[1] 李伟[1] 董丽娟[1] 石云龙[1] FAN Xia-Xia;GAO Zhi-Xiang;QU Wen-Shan;TIAN Cui-Feng;LI Jian-Gang;LI Wei;DONG Li-Juan;SHI Yun-Long(Shanxi Province Key Laboratory of Microstructure Electromagnetic Functional Materials,Shanxi Datong University,Datong,Shanxi 037009,China;School of Chemistry and Chemical Engineering,Shanxi Datong University,Datong,Shanxi 037009,China)

机构地区：[1]山西大同大学,微结构电磁功能材料省市共建山西省重点实验室,大同037009 [2]山西大同大学化学与化工学院,大同037009

出　　处：《无机化学学报》2022年第6期1016-1022,共7页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21872088);山西省高等学校科技成果转化培育项目(No.31);大同市工业攻关项目(No.2018018,2019014)资助。

摘　　要：采用硅酸盐作为基质材料,通过高温固相法合成了Li_(4)SrCa(SiO_(4))_(2)∶Eu^(3+)红色荧光粉。通过X射线粉末衍射、X射线光电子能谱、透射电镜和荧光光谱,对所得样品的物相、形貌及其发光性能进行了表征分析。结果表明,掺入Eu^(3+)后,Li_(4)SrCa(SiO_(4))_(2)的晶体结构并没有发生改变。在393 nm光激发下,荧光粉的荧光光谱中693 nm处发射峰强度最强。以693 nm作为监测波长,荧光激发峰分别为361 nm(7F0→5D4)、375 nm(7F0→5G3)、413 nm(7F0→5D3)、393 nm(7F0→5L6)和464 nm(7F0→5D2),即样品对近紫外和蓝光有较好的吸收。利用发射光谱研究了Eu^(3+)掺杂浓度(物质的量分数)对荧光粉发光强度的影响。当Eu^(3+)的掺杂浓度x=0.10时,样品发射强度最强,发射红光,其色坐标为(0.6375,0.3537)。通过Dexter强度与浓度关系分析了浓度猝灭机制。Li_(4)SrCa(SiO_(4))_(2)∶Eu^(3+)red phosphor was synthesized by a high-temperature solid-phase method using silicate as a host material.The phase,morphology,and luminescence properties of the powder were characterized by X-ray diffraction,X-ray photoelectron spectroscopy,transmission electron microscopy,and fluorescence spectroscopy.The results showed that the crystal structure does not change after the addition of the europium ion.Under the light excitation at 393 nm,the emission peak intensity of the sample was the strongest at 693 nm.With 693 nm as the monitoring wavelength,the main excitation peaks were 361 nm(7F0→5D4),375 nm(7F0→5G3),413 nm(7F0→5D3),393 nm(7F0→5L6),and 464 nm(7F0→5D2),which suggests that the phosphor has good absorption to near-ultraviolet and blue light,and has the potential to produce white light-emitting diodes.The effect of Eu^(3+)doped concentration on the luminescence intensity of phosphor was studied by emission spectroscopy.When the doped concentration of europium ion(molar fraction,x)was equal to 0.10,the emission intensity of the sample was the strongest,and the sample emitted red light.The mechanism of concentration quenching was analyzed by the relationship between Dexter strength and concentration.

关 键 词：高温固相法 Li_(4)SrCa(SiO_(4))_(2)∶Eu^(3+) 红色 发光性能 

分 类 号：O482.31[理学—固体物理] O614.338[理学—物理]