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Phosphors-converted near-infrared LED (pc-NIR LED) is finding applications in various fields including food quality analysis, night vision, biomedical imaging, and biomedicine. The design and development of broadband NIR phosphors with desired properties are decisive for pc-NIR LED devices. Cr3+ doped phosphors are considered to be the most promising near-infrared materials for commercialization. Broadband near-infrared luminescent materials doped with Cr3+ have attracted more and more attention due to their potential applications in near-infrared light sources. However, the emission wavelength of Cr3+ doped phosphors is generally located in the NIR I region of less than 850 nm, and achieving NIR II region emission is still a challenge. In this paper, a series of Cr3+ doped Na3YSi3O9 new silicate phosphors were prepared by solid-state method at 1150 ℃ for 8 h in N2 atmosphere. We take advantages of the silicate nature and the multi octahedral sites suitable for Cr3+ in the studied Na3YSi3O9 materials to redshift and broaden the spectrum. The phase, crystal structure, microstructure, photoluminescence, main emission peak decay and thermal stability of the samples were systematically studied. The results show that the prepared samples are pure phases, with uneven morphology and slight agglomeration, and the size is in the order of microns. Cr3+ is located in the weak crystal field environment in the Na3YSi3O9 lattice, the Dq/B value is 2.29. Under the excitation of 485 nm blue light, the strongest emission peak of Na3Y1-xSi3O9: xCr3+ phosphors are located at 984 nm (NIR II region), which is longer than most Cr3+ activated phosphors. Due to the multi-site occupation of Cr3+ in the lattice, the full width at half maximum (FWHM) of the emission spectrum is as high as 183 nm. The optimum doping concentration of Na3Y1-xSi3O9: xCr3+ is 3%, and the quenching mechanism is the dipole-dipole interaction between Cr3+ ions. Fluorescence decay curves show that the luminescence lifetime of Na3Y0.97Si3O9: 0.03Cr3+ sample gradually decreases with the increase of doping concentration and temperature. The results of the temperature-dependent spectra show that the emission intensity decreased in the temperature range of 298 K to 423 K, and the activation energy ΔE of Cr3+ is 0.157 eV.
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Keywords:
- silicate /
- Cr3+ /
- broadband near-Infrared /
- multi-sites
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