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Description:

Persistent luminescent phosphors of ZnGa2O4:xNi2+ (x = 0-0.01) were synthesized via
a traditional high-temperature solid-state reaction, which feature a broad emission band
in the second near-infrared (NIR-II) window. Ni2+ tends to occupy Ga3+ site in ZnGa2O4,
which results in the formation of oxygen vacancy. Upon ultraviolet (UV) or orange-red
lights excitation, the phosphors exhibit a broad NIR emission at about 1300 nm, arising
from the 3T2(3F)→3A2(3F) transition of Ni2+. Removing the light source yields intense
NIR afterglow, with the duration longer than 500 s. Strongest NIR emission and best
persistent luminescence are found for the x = 0.005 sample, which is excited by 254-
nm UV light. The ZnGa2O4:Ni2+ persistent phosphors have potential application in vivo
imaging, because of their charming emissions and afterglows with the wavelength
locating in NIR-II window.

Rights:

• Creative Commons BY-NC-ND Attribution-NonCommercial-NoDerivs 4.0 International
  

Keyword: Biological window, Ni2+, Near-infrared persistent phosphors, ZnGa2O4

Date published: 2022-10-13

Publisher: Elsevier BV

Journal:

• JOURNAL OF ALLOYS AND COMPOUNDS (ISSN: 09258388) vol. 931 p. 167491-167491

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4356

First published URL: https://doi.org/10.1016/j.jallcom.2022.167491

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Updated at: 2024-10-13 12:30:19 +0900

Published on MDR: 2024-10-13 12:30:21 +0900