Broadband photoluminescence toward the NIR II region and stable green ceramic pigments based on a novel NaBaScSi2O7:xCr silicate phosphor

Xuejiao Wang; Sihan Yang; Feng Jiang; Jiantong Wang; Changshuai Gong; Ji-Guang Li

doi:10.1039/D4TC05115G

Article Broadband photoluminescence toward the NIR II region and stable green ceramic pigments based on a novel NaBaScSi2O7:xCr silicate phosphor

Xuejiao Wang (Bohai University) ; Sihan Yang (Bohai University) ; Feng Jiang (Jingdezhen Ceramic University) ; Jiantong Wang (Bohai University) ; Changshuai Gong (Bohai University) ; Ji-Guang Li (Research Center for Electronic and Optical Materials/Optical Materials Field/Polycrystalline Optical Material Group, National Institute for Materials Science)

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Xuejiao Wang, Sihan Yang, Feng Jiang, Jiantong Wang, Changshuai Gong, Ji-Guang Li. Broadband photoluminescence toward the NIR II region and stable green ceramic pigments based on a novel NaBaScSi2O7:xCr silicate phosphor. JOURNAL OF MATERIALS CHEMISTRY C. 2025, 13 (12), 6364-6374. https://doi.org/10.1039/D4TC05115G

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Cr3+-activated near-infrared (NIR) phosphors are the most promising materials for commercialization.
However, the emission of most Cr3+-activated phosphors is typically located in the NIR-I region and
achieving luminescence towards the NIR-II region (4900 nm) via Cr3+ doping remains challenging. This study reports a novel Cr3+-activated NaBaScSi2O7 phosphor that exhibits broadband NIR emission centred at 974 nm with a full width at half maximum of 140 nm under 493 nm blue light excitation. The emission wavelength exceeds that of most Cr3+-activated NIR phosphors. The underlying mechanism for the encouraging phenomenon is attributed to the strong charge polarisation arising from the intrinsic local coordination environment of the Cr3+ ions, as confirmed by charge differential density (CDD) and the electron localization function (ELF) analyses. The photoluminescence properties of phosphors were systematically investigated, and the performance of the fabricated NIR pc-LED device was evaluated for night vision and non-invasive imaging. Notably, the NaBaScSi2O7 phosphor displayed a bright green colour with excellent colour properties and its potential as a stable green ceramic pigment was explored.

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