Sr_(2)MgSi_(2)O_(7)∶Eu^(2+),Eu^(3+)发光性能及颜色调控  

Luminescence Performance and Color Control of Sr_(2)MgSi_(2)O_(7)∶Eu^(2+),Eu^(3+)

作　　者：何玲[1,2] 温顺 孙卫民[1,2] 董其铮[1,2] 徐仰涛[1,2] 杨小凤 HE Ling;WEN Shun;SUN Weimin;DONG Qizheng;XU Yangtao;YANG Xiaofeng(School of Material Science Engineering,Lanzhou University of Technology,Lanzhou 730050,China;State Key Laboratory of Advanced Processing and Recycling of Nonferrous Metals,Lanzhou University of Technology,Lanzhou 730050,China;Gansu Rare Earth New Materials Co.,Ltd,Baiyin 730922,China)

机构地区：[1]兰州理工大学材料科学与工程学院,甘肃兰州730050 [2]兰州理工大学有色金属先进加工与回收国家重点实验室,甘肃兰州730050 [3]甘肃稀土新材料股份有限公司,甘肃白银730922

出　　处：《发光学报》2023年第12期2202-2210,共9页Chinese Journal of Luminescence

基　　金：甘肃省重点研发项目(20YF8WA063);中央领导地方科技发展资金项目(2023‐0401‐0076)。

摘　　要：采用静电纺丝法在不同气氛下制备了Sr_(2)MgSi_(2)O_(7)∶Eu^(2+),Eu^(3+)纤维,研究其晶体结构和形貌;将纤维与聚二甲基硅氧烷(PDMS)复合后获得Sr_(2)MgSi_(2)O_(7)∶Eu^(2+),Eu^(3+)‐PDMS复合材料,研究其光致发光和应力发光性能。研究结果显示,氮气、空气下制备样品的XPS图谱同时出现Eu^(2+)和Eu^(3+)结合能特征峰;在360 nm和395 nm激发下复合材料的光致发光光谱中,不但有Eu^(2+)位于469 nm处的蓝色宽带发射,还包含Eu^(3+)位于615 nm的多个红色窄带发射。因为Eu^(3+)在电荷补偿下还原成Eu^(2+)并在刚性结构保护下不被氧化,证实了Eu^(3+)在Sr_(2)MgSi_(2)O_(7)中的自还原现象。随着Eu^(3+)的掺杂浓度增大,光致发光和应力发光强度都先增大后减小,Eu^(2+)和Eu^(3+)的发射分别在5%和10%时达到最强。应力发光强度与应力的增长是线性关系,Eu^(2+)的发射增长量大于Eu^(3+)。在实物照片和CIE坐标中观测到光致发光颜色从蓝色逐渐接近红色,应力发光颜色在应力增大时逐渐从粉红色变为紫粉色。该材料的研究将为发光调控提供参考,在应力传感和防伪等领域有着潜在的使用价值。Sr_(2)MgSi_(2)O_(7)∶Eu^(2+),Eu^(3+)fibers were prepared by electrospinning under different atmospheres,and their crystal structure and morphology were studied.Composite materials of Sr_(2)MgSi_(2)O_(7)∶Eu^(2+),Eu^(3+)-PDMS were obtained by combining fibers with polydimethylsiloxane(PDMS),and their photoluminescence and mechanoluminescence properties were studied.The research results show that the XPS spectrum exhibits characteristic peaks of binding energy of Eu^(2+)and Eu^(3+)under nitrogen or air conditions.In the photoluminescence spectra of composite materials excited at 360 nm and 395 nm,there are not only blue broadband emissions of Eu^(2+)at 469 nm,but also multiple red narrowband emissions of Eu3+at 615 nm.Because Eu^(3+)is reduced to Eu^(2+)under charge compensation and is not oxidized under the protection of a rigid structure,it confirms the self reduction phenomenon of Eu^(3+)in Sr_(2)MgSi_(2)O_(7).As the doping concentration of Eu increases,the photoluminescence and mechanoluminescence intensities first increase and then decrease.The emission of Eu^(2+)and Eu^(3+)reaches their strongest at 5%and 10%,respectively.The intensity of mechanoluminescence is linearly related to the growth of stress,and the emission growth of Eu^(2+)is greater than that of Eu3+.In physical photos and CIE coordinates,it was observed that the photoluminescence color gradually approached red from blue,and the mechanoluminescence color gradually changed from pink to purple pink as the stress in‐creased.The study of this material will provide reference for luminescence regulation,and has potential usage value in fields such as stress sensing and anti-counterfeiting.

关 键 词：Sr_(2)MgSi_(2)O_(7)∶Eu^(2+) Eu^(3+) 纤维 自还原 应力发光 发光调控 

分 类 号：O482.31[理学—固体物理]