Optics & Laser Technology· 2026Q1
Broadband and tunable near-infrared emission of CaMg2Al16O27:Fe3+ with multi-site engineering
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- 2026year
Short summary
CaMg2Al16O27:Fe3+ phosphors exhibit broadband near-infrared (NIR) emission from 650-890 nm, with peaks at ~750 nm and 808 nm, due to Fe3+ ions occupying tetrahedral and octahedral sites.
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Key points
- CaMg2Al16O27:Fe3+ phosphors show broadband NIR emission between 650-890 nm.
- Two distinct emission peaks at ~750 nm and 808 nm arise from Fe3+ ions in tetrahedral ([FeO4]) and octahedral ([FeO6]) coordination, respectively.
- The material has a hexagonal structure with space group P-6 m2(187).
- A CaMg2Al16O27:Fe3+@PDMS film combined with a ~262 nm LED chip demonstrates NIR illumination.
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Abstract
Near-infrared (NIR) light has low scattering coefficient, strong penetration capability, and selective absorption by specific molecular features, causing that the developing broadband and high-efficiency NIR source is very important. Fe 3+ as a promising NIR activator ion have garnered increasing attention due to its broad spectral characteristics, environmental benignity, tunable emission, and non-toxicity. In this work, CaMg 2 Al 16 O 27 :Fe 3+ with hexagonal structure and P-6 m2(187) space group is selected as the research system. A broadband NIR emission in the range of 650 – 890 nm is observed because of the transition 4 T 1 ( 4 G) → 6 A 1 ( 6 S) of Fe 3+ ion, containing two PL peaks at ∼ 750 and 808 nm derived from Fe 3+ ions in [FeO 4 ] tetrahedron and [FeO 6 ] octahedron, respectively. CaMg 2 Al 16 O 27 :Fe 3+ @PDMS film is prepared and NIR illumination by combining the CaMg 2 Al 16 O 27 :Fe 3+ @PDMS film with a ∼ 262 nm LED chip is investigated. This study confirms the potential applications of CaMg 2 Al 16 O 27 :Fe 3+ in non-invasive detection technologies, night vision, and biological imaging and provides important insights for the design and development of Fe 3+ -doped NIR phosphors.
The authors' abstract, as published at the source. Optics & Laser Technology, 2026 · DOI ↗
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