Excitation energy mediated cross-relaxation for tunable upconversion luminescence from a single lanthanide ion

Xiao Fu, Shuai Fu, Qi Lu, Jing Zhang, Pingping Wan, Jinliang Liu, Yong Zhang (), Chia-Hung Chen, Wei Li, Huadong Wang and Qingsong Mei ()
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Xiao Fu: Jinan University
Shuai Fu: Shanghai University
Qi Lu: Jinan University
Jing Zhang: Shanghai University
Pingping Wan: Hefei University of Technology
Jinliang Liu: Shanghai University
Yong Zhang: National University of Singapore
Chia-Hung Chen: City University of Hong Kong
Wei Li: Jinan University
Huadong Wang: Jinan University
Qingsong Mei: Jinan University

Nature Communications, 2022, vol. 13, issue 1, 1-8

Abstract: Abstract Precise control of energy migration between sensitizer ions and activator ions in lanthanide-doped upconversion nanoparticles (UCNPs) nowadays has been extensively investigated to achieve efficient photon upconversion. However, these UCNPs generally emit blue, green or red light only under fixed excitation conditions. In this work, regulation of the photon transition process between different energy levels of a single activator ion to obtain tunable upconversion fluorescence under different excitation conditions is achieved by introducing a modulator ion. The cross-relaxation process between modulator ion and activator ion can be controlled to generate tunable luminescence from the same lanthanide activator ion under excitation at different wavelengths or with different laser power density and pulse frequency. This strategy has been tested and proven effective in two different nanocrystal systems and its usefulness has been demonstrated for high-level optical encryption.

Date: 2022
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DOI: 10.1038/s41467-022-32498-4

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