Sr_(2)LiSiO_(4)F的晶格位点工程调控实现混合价态Eu^(2+/3+)应用于比例型温度传感  

Crystal Site Engineering in Sr_(2)LiSiO_(4)F Enabling Mixed-valent Europium Toward Ratiometric Temperature Sensing

作　　者：黄帅 王金迪 颜雨 尚蒙蒙 HUANG Shuai;WANG Jin-di;YAN Yu;SHANG Meng-meng(Key Laboratory for Liquid-solid Structural Evolution and Processing of Materials(Ministry of Education), School of Material Science and Engineering, Shandong University, Jinan 250061, China;College of Materials Science and Engineering, Nanchang University, Nanchang 330031, China)

机构地区：[1]山东大学材料科学与工程学院材料液固结构演变与加工教育部重点实验室,山东济南250061 [2]南昌大学材料科学与工程学院,江西南昌330031

出　　处：《发光学报》2021年第12期1829-1836,共8页Chinese Journal of Luminescence

基　　金：国家自然科学基金(51672265);山东省自然科学基金(ZR2018JL016);山东大学齐鲁青年学者资助项目。

摘　　要：通过高温固相法制备了一系列Eu掺杂的Sr_(1.95+x)Li_(1-x)Si_(1-x)Al_(x)O_(4)F(0≤x≤0.25)发光材料,并详细研究了所制备Sr_(2)LiSiO_(4)F化合物的晶体结构及相组成。利用Al^(3+)-Sr^(2+)离子对取代Si^(4+)-Li^(+)离子对的晶体位点工程,对Eu^(2+)占据的Sr多面体位点进行调控,实现单相Sr_(1.95+x)Li_(1-x)Si_(1-x)Al_(x)O_(4)F(0≤x≤0.25)材料中Eu^(2+)和Eu^(3+)的共存,获得了Sr_(1.95+x)Li_(1-x)Si_(1-x)Al_(x)O_(4)F∶Eu体系从绿光到红光的发光调谐。通过对Sr_(1.95+x)Li_(1-x)Si_(1-x)-Al_(x)O_(4)F∶Eu材料中的Eu^(2+)和Eu^(3+)离子在25~300℃范围内温度依赖性光谱的研究发现Eu^(2+)和Eu^(3+)呈现不同的温度敏感特性。经计算,Sr_(1.95+x)Li_(1-x)Si_(1-x)Al_(x)O_(4)F∶0.05Eu发光材料的温度传感绝对灵敏度和相对灵敏度可分别达到2.83%·K^(-1)与0.66%·K^(-1),进一步证实了所制备发光材料在温度传感方面的应用潜力。Eu-doped Sr_(1.95+x)Li_(1-x)Si_(1-x)Al_(x)O_(4)F(0≤x≤0.25)phosphors were prepared by solid-state method.The Sr polyhedron sites occupied by Eu^(2+)in the Sr_(2)LiSiO_(4)F matrix lattice were adjusted via crystal site engineering method which is implemented by replacing Si^(4+)-Li^(+)with Al3+-Sr2+ion pairs.The co-existence of Eu^(2+)and Eu^(3+)in single-phase Sr_(1.95+x)Li_(1-x)Si_(1-x)Al_(x)O_(4)F∶0.05Eu(0≤x≤0.25)phosphors was achieved,and the luminescence was tuned from green to red light.The temperature-dependent spectra(25-300℃)of Eu^(2+)and Eu^(3+)ions in Sr_(1.95+x)Li_(1-x)Si_(1-x)-Al_(x)O_(4)F∶0.05Eu were studied.It was found that Eu^(2+)and Eu^(3+)have different temperature sensitivities.The absolute sensitivity and relative sensitivity of temperature sensing of the Sr_(1.95+x)Li_(1-x)Si_(1-x)-Al_(x)O_(4)F∶0.05Eu phosphor reach 2.83%·K^(-1) and 0.66%·K^(-1),respectively,which further confirms the application potential of the prepared phosphors in temperature sensing.

关 键 词：晶格位点工程 混合价态Eu 温度传感 

分 类 号：O482.31[理学—固体物理]