【摘要】 近年来，近红外荧光粉转换发光二极管（NIR pc-LED）在夜视、生物成像和无损检测等领域引起了广泛关注。然而，获得兼具高量子效率和优异热稳定性的近红外荧光粉仍然是一个巨大挑战。本文利用高温固相法合成了一种新型近红外荧光粉Ba Y₂Al₂Ga₂SiO₁₂:Cr³⁺(BYAGSO:Cr³⁺)，并系统研究了材料的结构和发光性质。在440 nm蓝光激发下，BYAGSO:Cr³⁺荧光粉的发射光谱在650～850 nm范围内呈现锐线和宽带的混合发射，源于Cr³⁺:²E→⁴A₂自旋禁戒跃迁和⁴T₂→⁴A₂自旋允许跃迁发射。该近红外发光表现出可观的量子效率和良好的热稳定性，最优化样品的外量子效率可达30.3%，在200℃时样品的发光强度可保持其在室温时强度的99%。通过将BYAGSO:Cr³⁺荧光粉与450 nm蓝光LED芯片结合，我们封装了一个NIR pc‐LED器件。该器件在300m A驱动电流下，输出功率为70.83 mW；在20m A驱动电流下，光电转换效率为11.20%。研究结果表明，BY-AGSO:Cr³⁺在NIR pc-LED领域具有良好的应用前景。更多还原

【Abstract】 In recent years, near-infrared phosphor-converted light-emitting diode（NIR pc-LED） has attracted widespread attention in the fields of night vision, bioimaging and non-destructive testing. However, obtaining NIR phosphors with both high quantum efficiency and excellent thermal stability remains a great challenge. In this work, we synthesized a novel NIR phosphor BYAGSO∶Cr³⁺. Under 440 nm excitation, BYAGSO∶Cr³⁺ shows a broad band emission peaked at 690 nm, which originates from the combination of the spin-forbidden ²E→⁴A₂ transition and spinallowed ⁴T₂→⁴A₂ transition of Cr³⁺ in a medium octahedral crystal field environment. Interestingly, this phosphor exhibits excellent thermal stability, and the optimal BYAGSO∶0. 06 Cr³⁺ remains at 99% of its initial intensity at 200 ℃. Meanwhile, this phosphor also has considerable quantum efficiency of 30. 3%. A NIR pc-LED device was fabricated by combining BYAGSO∶0. 06 Cr³⁺ with a 450 nm blue LED chip, which exhibited the output power of 70. 83 mW at the driving current of 300 mA, and the photovoltaic conversion efficiency of 11. 20% at the driving current of 20 mA. The results indicates that BYAGSO∶0. 06Cr³⁺ is a promising phosphor for NIR pc-LED applications.更多还原