Broadband NIR phosphors are urgently needed in NIR-LED and medical imaging. In this paper, a new type of near-infrared phosphor Li₂Mg_1-0.5xZr_1-0.5xO₄: xCr³⁺(0.6% ≤ x ≤ 1.6%) was synthesized by high temperature solid phase method. The optimal doping concentration of the phosphor is x = 1.0%, which exhibits broadband emission in the range of 600–1200 nm, and reaches the full width at half maximum (FWHM) of 205 nm under 462 nm blue excitation. The X-ray diffraction characterization results of the Li₂Mg_1-0.5xZr_1-0.5xO₄: xCr³⁺(0.6% ≤ x ≤ 1.6%) sample are refined and analyzed, and the doped sample is basically consistent with the pure phase. The sample was characterized by diffuse emission, and it was found that the sample matrix had intrinsic absorption. The thermal stability of Li₂Mg_0.995Zr_0.995O₄:1.0%Cr³⁺ phosphor was studied, and its relative intensity was 51.3% of room temperature at 100 °C. The results show that this new type of ultra-wide near-infrared emitting phosphor has application potential in medical imaging and PC-LED directions.

在NIR-LED和医学成像中迫切需要宽带NIR荧光粉。本文采用高温固相法合成了新型近红外荧光粉Li ₂ Mg _1-0.5x Zr _1-0.5x O ₄：xCr ³⁺（0.6％≤x≤1.6 ％）。磷光体的最佳掺杂浓度为x = 1.0％，在600-1200 nm范围内表现出宽带发射，并在462 nm蓝色激发下达到205 nm的半峰全宽（FWHM）。Li ₂ Mg _1-0.5x Zr _1-0.5x O ₄：xCr ³⁺的X射线衍射表征结果（0.6％≤x≤1.6％）样品经过精制和分析，掺杂样品与纯相基本一致。样品的特征在于扩散发射，并且发现样品基质具有固有吸收。研究了Li ₂ Mg _0.995 Zr _0.995 O ₄：1.0％Cr ³⁺荧光粉的热稳定性，其相对强度为100°C室温的51.3％。结果表明，这种新型的超宽近红外发射荧光粉在医学成像和PC-LED方向上具有应用潜力。