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Issue 30, 2018
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A new up-conversion charging concept for effectively charging persistent phosphors using low-energy visible-light laser diodes

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Abstract

It is general knowledge in persistent luminescence that high-energy illumination, mostly ultraviolet light, is usually necessary in order to effectively charge persistent phosphors. However, the need for high-energy ultraviolet light excitation compromises some applications. In his pioneering work on ruby (Al2O3:Cr3+) laser materials in 1960, Theodore Maiman observed an excited-state absorption phenomenon under the excitation of a high-intensity green-light flash tube. Inspired by Maiman's observation, here we propose a new two-photon up-conversion charging (UCC) concept to effectively charge Cr3+-activated near-infrared persistent phosphors using low-energy, high-intensity visible-light laser diodes. As an example, we demonstrate that a low-energy 635 nm laser diode can produce persistent luminescence in the LiGa5O8:Cr3+ persistent phosphor at the same magnitude as that produced by high-energy 335 nm ultraviolet light from a xenon arc lamp. Moreover, the UCC appears to be a common phenomenon in persistent phosphors containing other UCC-enabling activators such as rare-earth Pr3+ ions and transition metal Mn2+ ions. The UCC technique offers a new way to study persistent luminescence and utilize persistent phosphors; for instance, in bioimaging it makes effective in vivo charging persistent optical probes using tissue-friendly visible light possible.

Graphical abstract: A new up-conversion charging concept for effectively charging persistent phosphors using low-energy visible-light laser diodes

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Publication details

The article was received on 18 May 2018, accepted on 16 Jun 2018 and first published on 18 Jun 2018


Article type: Paper
DOI: 10.1039/C8TC02419G
Citation: J. Mater. Chem. C, 2018,6, 8003-8010

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    A new up-conversion charging concept for effectively charging persistent phosphors using low-energy visible-light laser diodes

    Y. Chen, F. Liu, Y. Liang, X. Wang, J. Bi, X. Wang and Z. Pan, J. Mater. Chem. C, 2018, 6, 8003
    DOI: 10.1039/C8TC02419G

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