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Photon Upconversion Afterglow material toward Visual Information Coding/Decoding

Abstract

The development of luminescent material with visual afterglow plays a crucial role in information security. Herein, a long-lived phosphor KCaF3:Yb3+,Mn2+ with visualized photon upconversion (UC) afterglow is presented. The UC emission spectrum consists of a high color purity (~99.33%) yellow emission band peaking at ~570 nm, and the UC afterglow signal can be observed by naked eye in both bright and dark fields even at a high temperature of 200℃. Moreover, the demonstration background and pigments have little influence on the UC afterglow identification. The density functional theory (DFT) calculations and the up-/down-conversion luminescence characteristics suggest that the UC afterglow is originated from the long-lived exchange coupled Yb3+-Mn2+ dimers formed in KCaF3:Yb3+,Mn2+, which is independent on the conventional “afterglow trap”. The random distribution characteristics of Mn2+, and the oxygen ion (O2-) introduced by Yb3+ non-equivalent doping are the key factors for forming the efficient UC emission center in this system. Using the photon UC afterglow phosphor in screen printing ink, a visualized information encoding/decoding prototype suitable for both human and machine fast identification is demonstrated.

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Supplementary files

Article information


Submitted
12 Dec 2019
Accepted
02 Feb 2020
First published
03 Feb 2020

J. Mater. Chem. C, 2020, Accepted Manuscript
Article type
Paper

Photon Upconversion Afterglow material toward Visual Information Coding/Decoding

X. X. Han, E. Song, Y. Zhou, T. Hu, Z. Xia and Q. Zhang, J. Mater. Chem. C, 2020, Accepted Manuscript , DOI: 10.1039/C9TC06785J

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