首页|High-sensitive nonthermally coupled upconversion for ultralow temperature sensing

High-sensitive nonthermally coupled upconversion for ultralow temperature sensing

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Upconversion based nanothermometry has received much attention due to its merits of stability,narrow band emission and rich emission peaks.However,the previous works are mainly focused on the emis-sions from thermally coupled energy levels which is theoretically limited by Boltzmann distribution theory with resultant low temperature sensitivity in particular at ultralow temperatures.Here we report a LiYF4∶Yb/Ho@LiYF4 core-shell nanostructure to improve the sensitivity at low temperatures by taking advantage of non-thermally coupled energy levels of Ho3+.In detail,the green upconversion emission of Ho3+shows an increase with reducing temperature while its red upconversion emission presents a decline during the same process.This is primarily due to the suppression of the non-radiative multi-phonon relaxation occurred at the green emitting levels(5F4,5S2)and the intermediate level(5I6)at low temperatures.Such a feature contributes to a high relative sensitivity of 7.17％/K at 11 K,much higher than reported values.Our results provide a promising candidate for the development of nano-thermometer with high-sensitive low-temperature sensing performance.

UpconversionNanothermometryUltralow temperatureNonthermally coupled emissionsRare earths

Zhiyuan Cai、Zhengce An、Haozhang Huang、Yu Zhao、Bo Zhou

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State Key Laboratory of Luminescent Materials and Devices,Guangdong Provincial Key Laboratory of Fiber Laser Materials and Applied Techniques,and Institute of Optical Communication Materials,South China University of Technology,Guangzhou,510641,China

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaFundamental Research Funds for the Central UniversitiesLocal Innovative and Research Teams Project of Guangdong Pearl River Talents Program

51972119522721512022ZYGXZR0152017BT01X137

2024

10.1016/j.jre.2023.10.019

稀土学报(英文版)
中国稀土学会

稀土学报(英文版)

CSTPCDEI
影响因子：1.3
ISSN：1002-0721
年,卷(期)：2024.42(11)