Towards highly efficient NIR II response up-conversion phosphor enabled by long lifetimes of Er3+

Xiumei Yin, Wen Xu, Ge Zhu, Yanan Ji, Qi Xiao, Xinyao Dong, Ming He, Baosheng Cao, Na Zhou, Xixian Luo (), Lin Guo () and Bin Dong ()
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Xiumei Yin: Dalian Minzu University
Wen Xu: Dalian Minzu University
Yanan Ji: Dalian Minzu University
Qi Xiao: Dalian Minzu University
Xinyao Dong: Dalian Minzu University
Ming He: Dalian Minzu University
Baosheng Cao: Dalian Minzu University
Na Zhou: Dalian Minzu University
Xixian Luo: Dalian Minzu University
Lin Guo: Beijing University of Aeronautics & Astronautics
Bin Dong: Dalian Minzu University

Nature Communications, 2022, vol. 13, issue 1, 1-10

Abstract: Abstract The second near-infrared (NIR II) response photon up-conversion (UC) materials show great application prospects in the fields of biology and optical communication. However, it is still an enormous challenge to obtain efficient NIR II response materials. Herein, we develop a series of Er3+ doped ternary sulfides phosphors with highly efficient UC emissions under 1532 nm irradiation. β-NaYS2:Er3+ achieves a visible UC efficiency as high as 2.6%, along with high brightness, spectral stability of lights illumination and temperature. Such efficient UC is dominated by excited state absorption, accompanied by the advantage of long lifetimes (4I9/2, 9.24 ms; 4I13/2, 30.27 ms) of excited state levels of Er3+, instead of the well-recognized energy transfer UC between sensitizer and activator. NaYS2:Er3+ phosphors are further developed for high-performance underwater communication and narrowband NIR photodetectors. Our findings suggest a novel approach for developing NIR II response UC materials, and simulate new applications, eg., simultaneous NIR and visible optical communication.

Date: 2022
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DOI: 10.1038/s41467-022-34350-1

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