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The near-infrared (NIR) light of 900-1100 nm exhibits enormous application potential in fields such as optical communication and biological detection. However, high-efficiency phosphors emitting beyond 900 nm remain extremely limited due to non-radiative deactivation. In this study, a 455 nm blue light excitable NIR phosphor that efficiently emits in the wide range of 700-1200 nm (peaking at ~960 nm) was obtained through Cr3+/La3+ codoping of Ruddlesden-Popper type Sr3Zr2O7 perovskite, whose internal/external quantum efficiencies (%) and thermal stability of luminescence (I423/I298, %) reached ~92.4/57.5 and 73, respectively. Experimental and theoretical analysis found the decisive role of the La3+ codopant in Cr3+ luminescence: it not only inhibited Cr3+ from oxidation but also attracted the Cr3+ ions to aggregate around it to form Cr3+-Cr3+ pairs for the aforesaid excellent luminescence. Combining the NIR phosphor with a Si-PIN photodetector created a highly effective blue-to-NIR conversion unit, demonstrating application potential of the phosphor for underwater wireless optical communication (UWOC).

Rights:

• Creative Commons BY Attribution 4.0 International
  

Keyword: Cr3+-pair luminescence, La3+ doping, Sr3 Zr2 O7 perovskite, Near-infrared phosphor

Date published: 2026-04-10

Publisher: Wiley

Journal:

• Laser & Photonics Reviews (ISSN: 18638899) vol. 20 issue. 15

Funding:

• National Natural Science Foundation of China 52371057

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.6466

First published URL: https://doi.org/10.1002/lpor.202503166

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Updated at: 2026-08-18 11:13:38 +0900

Published on MDR: 2026-08-18 12:27:25 +0900