College of Rare Earths, Jiangxi University of Science and Technology, Ganzhou 341000, PR China.
Dalton Trans. 2021 Jun 22;50(24):8446-8456. doi: 10.1039/d1dt01195b.
Near-infrared (NIR) phosphor-converted light emitting diode (pc-LED) light sources have broad application prospects in environmental science, biomedical and plant growth fields. However, NIR phosphors still suffer from narrowband emission and low thermal stability. Here, we prepared a novel Lu2CaMg2-xSi3O12:xCr3+ (LCMS:xCr3+, x = 0.005-0.06) phosphor with broadband emission by a high-temperature solid state reaction. Under excitation at 450 nm, the emission spectrum of the LCMS:0.05Cr3+ phosphor shows a broadband emission in the range of 650-1000 nm with a large full width at half maximum (FWHM) of 125 nm and an R-line emission of 692 nm. In addition, the LCMS:0.05Cr3+ phosphor has good thermal stability and can maintain 70% emission intensity at 150 °C relative to that at room temperature. The LCMS:0.05Cr3+ phosphor exhibits a high internal quantum efficiency (IQE) of ∼76%. Using this phosphor, a NIR pc-LED with photoelectric efficiencies of 14.8% at 100 mA and 6.0% at 320 mA and NIR output powers of 59.5 mW at 100 mA and 181.0 mW at 320 mA was obtained. The broadband LCMS:0.05Cr3+ phosphor with a NIR emission peaked at 750 nm can serve as a light source for plant cultivation and has superior application prospects in the agriculture field.
近红外（NIR）荧光粉转换发光二极管（pc-LED）光源在环境科学、生物医学和植物生长领域具有广阔的应用前景。然而，NIR 荧光粉仍然存在发射谱线窄和热稳定性差的问题。在这里，我们通过高温固相反应制备了一种新型的 Lu2CaMg2-xSi3O12:xCr3+（LCMS:xCr3+，x = 0.005-0.06）荧光粉，具有宽带发射。在 450nm 激发下，LCMS:0.05Cr3+荧光粉的发射光谱在 650-1000nm 范围内呈现宽带发射，半峰全宽（FWHM）为 125nm，R 线发射为 692nm。此外，LCMS:0.05Cr3+荧光粉具有良好的热稳定性，在 150°C 时相对于室温可保持 70%的发射强度。LCMS:0.05Cr3+荧光粉表现出约 76%的高光致发光量子效率（IQE）。使用该荧光粉，获得了光电效率分别为 100mA 时 14.8%和 320mA 时 6.0%、100mA 时 NIR 输出功率为 59.5mW 和 320mA 时 181.0mW 的 NIR pc-LED。峰值位于 750nm 的宽带 LCMS:0.05Cr3+荧光粉可用作植物栽培的光源，在农业领域具有优越的应用前景。
