Near infrared (NIR) light sources play vital roles in bioimaging, medical treatments, food analysis and machine vision. Herein, we report unusual broadband NIR emission in BaMgAl₁₀O₁₇:Cr³⁺ (BAM:Cr³⁺) via site engineering. Both the emission maximum and spectral bandwidth of BAM:Cr³⁺ can be tailored by controlling the site occupancy of Cr³⁺ on two different Al sites. The optimal BAM:0.2Cr³⁺ phosphor exhibits both a sharp line spectrum (λ_em = 696 nm) and a broadband emission centered at 762 nm, having an internal quantum efficiency (IQE) of ~ 94%. A prototype NIR light source was demonstrated by combining a blue laser diode with BAM:Cr³⁺ phosphor-in-glass (PiG) and revealed an NIR light output power of 3.4 mW when driven by a 100 mW blue laser diode.

近红外（NIR）光源在生物成像，医学治疗，食品分析和机器视觉中起着至关重要的作用。本文中，我们通过现场工程报告了BaMgAl ₁₀ O ₁₇：Cr ³⁺（BAM：Cr ³⁺）中异常宽带NIR发射。BAM：Cr ^3+的最大发射和光谱带宽都可以通过控制Cr ³⁺在两个不同Al位置上的位点占有率来调整。最佳的BAM：0.2Cr ³⁺荧光粉同时具有清晰的线谱（_λem = 696 nm）和以762 nm为中心的宽带发射，内部量子效率（IQE）为〜94％。通过将蓝色激光二极管与BAM：Cr ³⁺玻璃中荧光粉（PiG）组合在一起，展示了一种近红外光源的原型，并在由100 mW蓝色激光二极管驱动时显示出3.4 mW的NIR光输出功率。