摘要
稀土掺杂发光材料在高温下会发生热猝灭,极大地限制了其在高温区域的应用.随着温度的增加,稀土掺杂负热膨胀材料中稀土离子之间的距离减小,从而实现热增强.然而,目前的研究主要集中于负热膨胀材料在可见光区域的上转换和下转移发光,而很少关注近红外发光的热增强.本文中制备的Yb_(2)W_(3)O_(12):Er负热膨胀材料实现了上转换和近红外下转移发光热增强.当温度从293 K增加到573 K时,Er^(3+)的绿色上转换发光增加了27倍,近红外下转移发光增加了87倍.本文还制备了负热膨胀Yb_(2)W_(3)O_(12):Er荧光粉和正热膨胀CaWO_(4):Yb/Er的混合荧光粉,解决了非接触荧光强度比温度传感器热耦合能级的限制.基于荧光强度比(I860/I525,I860/I675,I1550/I525,和I1550/I675)的最大相对灵敏度分别为2.04%K^(−1),2.15%K^(−1),2.01%K^(−1)和2.09%K^(−1),表明其在温度传感器中的潜在应用.
Rare earth-doped luminescent materials suffer from thermal quenching(TQ)at high temperatures,greatly limiting their application in the high-temperature region.In this work,we prepared Yb_(2)W_(3)O_(12):Er negative thermal expansion(NTE)materials,achieving thermal enhancement of upconversion(UC)and near-infrared(NIR)downshift(DS)luminescence upon 980-nm excitation.When the temperature increased from 293 to 573 K,the green UC luminescence of Er3+increased by 27 times,and the NIR DS luminescence increased by 87 times.The in situ temperature-dependent X-ray diffraction showed that the unit cell volume of Yb_(2)W_(3)O_(12):Er^(3+)samples decreased as the temperature increased,which reduced the distance between rare earth ions and increased the energy transfer.We further prepared NTE Yb_(2)W_(3)O_(12):Er phosphor and positive thermal expansion(PTE)CaWO_(4):Yb/Er phosphor,which enhanced the relative luminescence intensity through thermal enhancement of NTE Yb_(2)W_(3)O_(12):Er phosphor and TQ of PTE CaWO_(4):Yb/Er phosphor.The mixed phosphor addresses the limitations of TQ and thermal coupling energy of temperature sensors for non-contact fluorescence intensity ratio(FIR)thermometers.The maximum relative sensitivity(Sr)was 2.04%K−1,2.15%K−1,2.01%K−1,and 2.09%K−1 in the infrared-red FIR(I860/I525,I860/I675,I1550/I525,and I1550/I675),respectively,indicating its practical application in temperature sensors.
作者
陈志浩
寸阳珂
闫世磊
字映竹
朱博坤
阮柯亮
丁伯杰
杨正猛
Asif Ali Haider
Imran Khan
Cherkasova Tatiana
邱建备
黄安君
刘月
杨正文
Zhihao Chen;Yangke Cun;Shilei Yan;Yingzhu Zi;Bokun Zhu;Keliang Ruan;Bojie Ding;Zhengmeng Yang;Asif Ali Haider;Imran Khan;Cherkasova Tatiana;Jianbei Qiu;Anjun Huang;Yue Liuand Zhengwen Yang(College of Materials Science and Engineering,Kunming University of Science and Technology,Kunming 650093,China;School of Chemistry and Oil and Gas Technology,Kuzbas National Technical University,Kemerovo 650000,Russia)
基金
supported by the National Natural Science Foundation of China (51762029 and 12204206)
Yunnan Fundamental Research Project (202101BE070001-043 and 202201AU070119)
the National Natural Science Foundation of High-end Foreign Experts Introduction Plan (G2022039008L)
the Academician Workstation of Cherkasova Tatiana in Yunnan Province (202305AF150099)
Yunnan Province Major Science and Technology Special Plan (202302AB080005)
Chuoli Chengcai Training Program of KUST Faculty of Materials Science and Engineering (CLXYCLCC2023070)
