Interplay of defect levels and rare earth emission centers in multimode luminescent phosphors

Xinquan Zhou, Lixin Ning (), Jianwei Qiao, Yifei Zhao, Puxian Xiong and Zhiguo Xia ()
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Xinquan Zhou: South China University of Technology
Lixin Ning: Anhui Normal University
Jianwei Qiao: South China University of Technology
Yifei Zhao: South China University of Technology
Puxian Xiong: South China University of Technology
Zhiguo Xia: South China University of Technology

Nature Communications, 2022, vol. 13, issue 1, 1-9

Abstract: Abstract Multimode luminescence generally involves tunable photon emissions in response to various excitation or stimuli channels, which demonstrates high coding capacity and confidentiality abilities for anti-counterfeiting and encryption technologies. Integrating multimode luminescence into a single stable material is a promising strategy but remains a challenge. Here, we realize distinct long persistent luminescence, short-lived down/upconversion emissions in NaGdTi2O6:Pr3+, Er3+ phosphor by emloying interplay of defect levels and rare earth emission centers. The materials show intense colorful luminescence statically and dynamically, which responds to a wide spectrum ranging from X-ray to sunlight, thermal disturbance, and mechanical force, further allowing the emission colors manipulable in space and time dimensions. Experimental and theoretical approaches reveal that the Pr3+ ↔ Pr4+ valence change, oxygen vacancies and anti-site TiGd defects in this disordered structure contributes to the multimode luminescence. We present a facile and nondestructive demo whose emission color and fade intensity can be controlled via external manipulation, indicating promise in high-capacity information encryption applications.

Date: 2022
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DOI: 10.1038/s41467-022-35366-3

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