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Thermally stable near-infrared emission from a double perovskite K2LiScF6:Cr3+ phosphor for light-emitting diodes.
- Source :
-
Journal of Alloys & Compounds . Nov2023, Vol. 965, pN.PAG-N.PAG. 1p. - Publication Year :
- 2023
-
Abstract
- The exploration of Cr3+-doped near-infrared (NIR) phosphors for light-emitting diodes has attracted widespread attention. In this work, we present a fluoride double perovskite K 2 LiScF 6 :Cr3+ NIR-emitting phosphor through a co-precipitation method. It was found that the Cr3+ activators undergo a weak crystal field and present a NIR emission band peaking at 768 nm under blue light excitation (430 nm). Meanwhile, the K 2 LiScF 6 :Cr3+ exhibits a high activation energy (0.537 eV), a weak electron-phonon coupling (EPC) effect and a remarkable photoluminescence thermal stability at 423 K, with an intensity of 95.1% of that at room temperature. Profiting from the luminescent properties, clear night vision images and human palm vein photographs were realized by coating the K 2 LiScF 6 :Cr3+ phosphor on a blue InGaN chip and using it as a lighting source, suggesting its applicability in light-emitting diodes for NIR spectroscopy applications. • A novel near-infrared phosphor of K 2 LiScF 6 :Cr3+ has been synthesized. • The low thermal quenching behavior of Cr3+ in K 2 LiScF 6 host was verified. • The applications of K 2 LiScF 6 :Cr3+ for night vision and vein imaging were evaluated. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09258388
- Volume :
- 965
- Database :
- Academic Search Index
- Journal :
- Journal of Alloys & Compounds
- Publication Type :
- Academic Journal
- Accession number :
- 169752114
- Full Text :
- https://doi.org/10.1016/j.jallcom.2023.171336