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ZnGa2O4:Cr3+ persistent luminescent phosphors (PLPs) have been widely applied in bioimaging and photonics due to their ultra-long near-infrared (NIR) afterglow. However, UV and visible excitation currently in use have shallow penetration depth or harmful effect on organism, which limits the long-term bioimaging. Therefore, developing NIR PLPs excited by NIR light is urgent for bioimaging. Here, Zn1-x(Li/Ga)xGa2O4:Cr3+ (x=0-1) NIR PLPs were synthesized. All the newly introduced Ga3+ ions occupy the tetrahedral sites. However, with increasing Li+/Ga3+ content, Li+ ions firstly occupy the tetrahedral position, then partially enter octahedral sites, and completely occupy the octahedral sites at x=1. Incorporation of Li+
/Ga3+ contributes to the weakened crystal field strength, which leads to a deeper trap depth and a wider
trap energy level. A complete replacement of Zn2+ by Li+/Ga3+ ions leads to the splitting of the trap energy level into two-divided ones, which reduces the electron transfer between deep/shallow traps and makes the deep trap energy level be near to the 2E energy level of Cr3+. Therefore, an enhanced NIR afterglow excited by the lowenergy NIR light is found for the Li+ /Ga3+ doped sample. This work provides a new category for the NIR-absorptive-NIR-emissive PLPs and proposes a new application for long-term bioimaging.

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• In Copyright
  

Keyword: Cr3+, NIR luminescence, Persistent luminescence

Date published: 2023-03-16

Publisher: Royal Society of Chemistry (RSC)

Journal:

• Inorganic Chemistry Frontiers (ISSN: 20521553) vol. 10 issue. 7 p. 2174-2188

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4335

First published URL: https://doi.org/10.1039/d3qi00184a

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Updated at: 2024-03-19 12:30:28 +0900

Published on MDR: 2024-03-19 12:30:28 +0900