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.

Here, the authors report tunable luminescence from a single lanthanide ion upon changing excitation conditions through co-doping an energy-modulator ion, thus adjusting the photon transition process of the lanthanide activator ion. Optical encryption has also been demonstrated as an application of this universal strategy.

Details

Title
Excitation energy mediated cross-relaxation for tunable upconversion luminescence from a single lanthanide ion
Author
Fu, Xiao 1 ; Fu, Shuai 2 ; Lu, Qi 1 ; Zhang, Jing 2 ; Wan, Pingping 3 ; Liu, Jinliang 2 ; Zhang, Yong 4   VIAFID ORCID Logo  ; Chen, Chia-Hung 5   VIAFID ORCID Logo  ; Li, Wei 1 ; Wang, Huadong 6 ; Mei, Qingsong 7   VIAFID ORCID Logo 

 Jinan University, Department of Medical Biochemistry and Molecular Biology, School of Medicine, Guangzhou, China (GRID:grid.258164.c) (ISNI:0000 0004 1790 3548) 
 Shanghai University, School of Environmental and Chemical Engineering, Shanghai, China (GRID:grid.39436.3b) (ISNI:0000 0001 2323 5732) 
 Hefei University of Technology, School of Food and Biological Engineering, Hefei, China (GRID:grid.256896.6) (ISNI:0000 0001 0395 8562) 
 National University of Singapore, Department of Biomedical Engineering, College of Design and Engineering, Singapore, Singapore (GRID:grid.4280.e) (ISNI:0000 0001 2180 6431) 
 City University of Hong Kong, Department of Biomedical Engineering, Hong Kong SAR, China (GRID:grid.35030.35) (ISNI:0000 0004 1792 6846) 
 Jinan University, Key Laboratory of State Administration of Traditional Chinese Medicine of the People’s Republic of China, School of Medicine, Guangzhou, China (GRID:grid.258164.c) (ISNI:0000 0004 1790 3548) 
 Jinan University, Department of Medical Biochemistry and Molecular Biology, School of Medicine, Guangzhou, China (GRID:grid.258164.c) (ISNI:0000 0004 1790 3548); Jinan University, Key Laboratory of State Administration of Traditional Chinese Medicine of the People’s Republic of China, School of Medicine, Guangzhou, China (GRID:grid.258164.c) (ISNI:0000 0004 1790 3548) 
Publication year
2022
Publication date
2022
Publisher
Nature Publishing Group
e-ISSN
20411723
Source type
Scholarly Journal
Language of publication
English
ProQuest document ID
2701341635
Copyright
© The Author(s) 2022. This work is published under http://creativecommons.org/licenses/by/4.0/ (the “License”). Notwithstanding the ProQuest Terms and Conditions, you may use this content in accordance with the terms of the License.