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• W4313429742 abstract "Near-infrared (NIR) phosphor-converted light-emitting diodes (pc-LEDs) are newly emerging broadband NIR light sources. However, the lack of high-performance NIR-emitting materials limits their popularization. Herein, an anionic F-substitution strategy is presented to regulate the light absorption and emission of MgGa2O4:Cr3+ phosphors. Accordingly, absorption enhancement as well as emission redshift and broadening are achieved for F-substituted MgGa2O4:Cr3+ (MGOF:Cr3+) phosphors, simultaneously with high efficiency and excellent thermal stability. Upon blue light excitation, the MGOF:0.02Cr3+ phosphor exhibits a broadband NIR emission (650–1200 nm) with a peak wavelength (λmax) of 835 nm and a full width at half maximum of ≈250 nm. Furthermore, MGOF:0.02Cr3+ has a near-unity internal quantum efficiency and its emission intensity at 150 °C maintains 94% of the initial value. A record external quantum efficiency of 60.6% is further achieved for MGOF:0.08Cr3+ with a redshifted λmax of 870 nm. The Cr3+ local structural alteration with F-substitution is revealed to account for the outstanding NIR luminescence characteristics of MGOF:Cr3+ in view of systematic structural characterization and spectroscopic analysis. A broadband NIR pc-LED device with good optical performance is fabricated and its application in semiconductor wafer inspection is demonstrated. This study initiates a new way to design high-performance NIR phosphors." @default.
• W4313429742 created "2023-01-06" @default.
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• W4313429742 date "2022-12-19" @default.
• W4313429742 modified "2023-10-02" @default.
• W4313429742 title "Simultaneous Absorption and Near‐Infrared Emission Enhancement of Cr ³⁺ Ions in MgGa ₂ O ₄ Spinel Oxide via Anionic F‐Substitution" @default.
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• W4313429742 doi "https://doi.org/10.1002/adom.202202458" @default.
• W4313429742 hasPublicationYear "2022" @default.
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