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A series of CaGdAlO4-type layered perovskite phosphors showing deep red luminescence (λem = 711 nm, λex = 338 nm) were synthesized via solid reaction. A comprehensive analysis via photoluminescence, X-ray photoelectron spectroscopy, thermoluminescence, and fluorescence decay revealed that the deep red luminescence is related to oxygen defects and particularly oxygen interstitials. The defects related luminescence was effectively regulated through partial substitution of multi-cationic sites (the Ca2+ site with Mg2+, Sr2+, Ba2+; the Gd3+ site with La3+, Y3+, Lu3+) and full substitution of the Gd3+ with Y3+. Remarkably, a 383.3% stronger luminescence was obtained through partial substitution with Lu3+, and the quantum yield of luminescence reached 28.74% which is higher than those of the most previously reported self-luminescence systems. A pc-LED device was fabricated with the phosphor, and the device was showed to have potential application in indoor plant cultivation.

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• In Copyright
  

Keyword: CaGdAlO4 perovskite, Defect luminescence, Cation substitution, NIR-LED

Date published: 2023-10-21

Publisher: Royal Society of Chemistry (RSC)

Journal:

• DALTON TRANSACTIONS (ISSN: 14779226) vol. 52 issue. 45 p. 16780-16790

Funding:

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.4282

First published URL: https://doi.org/10.1039/D3DT02805D

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Updated at: 2024-10-21 12:30:33 +0900

Published on MDR: 2024-10-21 12:30:33 +0900