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Ni2+-doped LaAlO3 perovskite ceramic samples with a charge compensator (M4+) were prepared and their luminescent properties were investigated. The LaAlO3:Ni2+–M4+ (M = Sn, Hf, Ti, Zr) perovskites show a broad near-infrared (NIR) luminescence peaking at around 1070 nm with 150 nm fwhm due to the Ni2+:3T2-3A2 transition. The Sn4+-codoped one showed the highest NIR luminescence intensity. The valence state of major Ni ions is changed from Ni3+ to Ni2+ by codoping with Sn4+ based on X-ray absorption spectroscopy. The LaAlO3:Ni2+–Sn4+ shows the shortest luminescence peak wavelength (λem = 1070 nm) at 300 K due to the strong crystal field and also shows the highest quenching temperature, T50% of 608 K in the temperature dependence of PL intensity, due to the largest activation energy among the Ni2+-doped NIR phosphors ever reported. Based on the positive trend in the plot of T50% vs PL peak energy, it is concluded that the dominant quenching process in almost all Ni2+ phosphors is the thermally activated crossover process. It is also demonstrated that the luminescence peak wavelength is shifted from 1070 to 1235 nm continuously by substituting Ga ions for the Al site.

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  This document is the Accepted Manuscript version of a Published Work that appeared in final form in Highly Thermal Stable Broadband Near-Infrared Luminescence in Ni2+-Doped LaAlO3 with Charge Compensator, copyright © 2023 American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see https://doi.org/10.1021/acsaom.3c00041

Keyword: Luminescence, NIR

Date published: 2023-06-23

Publisher: American Chemical Society (ACS)

Journal:

• ACS Applied Optical Materials (ISSN: 27719855) vol. 1 issue. 6 p. 1128-1137

Funding:

• Japan Society for the Promotion of Science 20H02438
• National Institute for Materials Science

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4558

First published URL: https://doi.org/10.1021/acsaom.3c00041

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Updated at: 2024-06-28 12:30:18 +0900

Published on MDR: 2024-06-28 12:30:18 +0900