1550 nm激发层状BiOCl:Er3+上转换发光及温度传感特性  

Upconversion Luminescence and Temperature Sensing Properties of Layered BiOCl: Er under 1550 nm Excitation

作　　者：彭跃红 任韦舟 邱建备[1] 韩缙[1] 杨正文[1] 宋志国[1] PENG Yuehong;REN Weizhou;QIU Jianbei;HAN Jin;YANG Zhengwen;SONG Zhiguo(School of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;School of Physics and Electronical Science,Chuxiong Normal University,Chuxiong 675000,China)

机构地区：[1]昆明理工大学材料科学与工程学院,昆明650093 [2]楚雄师范学院物理与电子科学学院,楚雄675000

出　　处：《无机材料学报》2020年第8期902-908,共7页Journal of Inorganic Materials

基　　金：国家自然科学基金(11874186);云南省应用基础研究计划项目(2017FB079);云南省中青年学术与技术带头人后备人才项目(2015HB013);云南省教育厅科研基金(2018JS452)。

摘　　要：由于热耦合能级(TCLs)差的影响,传统稀土上转换(UC)光学温度传感技术的灵敏度受到了极大限制,探索超灵敏温度特性上转换发光材料具有重要的理论和技术价值。本工作研究了1550nm激光激发下Er3+单掺BiOCl的上转换发光及温度传感性能。在近红外激发下, BiOCl:Er3+展现出强烈的670 nm红光发射、弱的525和542 nm绿光发射、微弱的406 nm紫光发射以及983 nm近红外发光。该上转换材料体系的红绿光发射表现出强烈的温度依赖性,在300~563K温度范围内, 4F9/2/4S3/2非热耦合能级绝对灵敏度(SA)达到95.3×10–3K-1,是2H11/2/4S3/2热耦合能级的22倍;同时相对灵敏度(SR)达到了1.19%K-1。1550 nm激发下BiOCl:Er3+的强烈红色上转换发光和高灵敏温度传感特性在显示及光学温度传感方面具有良好的应用前景。The sensitivity of optical temperature sensing based on the conventional rare-earth ion doped upconversion(UC) materials is limited by the energy gap between thermally coupled levels(TCLs) of rare-earth ions. Therefore, it is of great theoretical and technical interest to explore UC luminescent materials for optical temperature sensing with ultra-sensitive temperature characteristic. In this work, the UC luminescence properties and temperature sensing characteristics were studied for Er3+ single-doped BiOCl excited by 1550 nm laser. Under near-infrared(NIR) excitation, BiOCl:Er3+ exhibits strong red emission at 670 nm, weak green emissions at 525 and 542 nm, extremely weak violet emission at 406 nm, and near-infrared emission at 983 nm. Red and green emissions of the UC system exhibit strong temperature dependence, and in the temperature range of 300-563 K, the maximum absolute sensitivity(SA) obtained by employing the non-thermally coupled levels(NTCLs, 4F9/2/4S3/2) is 95.3×10–3K-1, which is 21 times more than that obtained by employing the thermally coupled levels(TCLs,2H11/2/4S3/2), and the maximum relative sensitivity(SR) is as high as 1.19% K-1. The results show that the intense red UC luminescence and temperature sensing with ultra-high sensitivity in BiOCl:Er3+ under 1550 nm excitation may have potential application prospect in display and optical temperature sensing.

关 键 词：上转换发光 温度传感 BiOCl 1550 nm激发层 

分 类 号：TQ174[化学工程—陶瓷工业]