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Broadband Near‐Infrared Garnet Phosphors with Near‐Unity Internal Quantum Efficiency
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-04-20 , DOI: 10.1002/adom.202000296 Endale T. Basore 1 , Wenge Xiao 1 , Xiaofeng Liu 2 , Jianhong Wu 1 , Jianrong Qiu 1
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2020-04-20 , DOI: 10.1002/adom.202000296 Endale T. Basore 1 , Wenge Xiao 1 , Xiaofeng Liu 2 , Jianhong Wu 1 , Jianrong Qiu 1
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Compact near‐infrared (NIR) light sources with broad emission band are essential to enable NIR spectroscopy compatible with portable devices, and phosphor‐converted light emitting diodes (pc‐LEDs) are efficient, low‐cost, and compact light sources. However, it is more challenging to develop highly efficient and thermally stable broadband NIR phosphors than conventional phosphors for white LEDs. Here, a series of solid solution phosphors with broadband NIR emission designed by cationic substitution in Cr3+ activated garnet Gd3Sc2Ga3O12 are reported. The internal quantum efficiency of Cr3+ emission can be significantly improved to nearly 100% via the substitution of ScO6 with smaller AlO6 octahedrons, which is attributed to the reduction of antisite defects. Moreover, the phosphor with optimized composition shows highly thermally stable emission, which renders the as‐fabricated pc‐LED with high‐power (750.8 mW) NIR emission covering the wavelength range of 700–1000 nm. The results could advance the development of NIR pc‐LEDs as high‐performance light sources for miniature NIR spectrometers.
中文翻译：
具有近统一内部量子效率的宽带近红外石榴石荧光粉
紧凑的，具有宽发射带的近红外（NIR）光源对于使NIR光谱与便携式设备兼容至关重要，磷光转换的发光二极管（pc-LED）是高效，低成本且紧凑的光源。然而，与用于白色LED的常规磷光体相比，开发高效且热稳定的宽带NIR磷光体更具挑战性。在此，报道了通过在Cr 3+活性石榴石Gd 3 Sc 2 Ga 3 O 12中进行阳离子取代而设计的一系列具有宽带NIR发射的固溶磷光体。通过取代ScO 6可以将Cr 3+发射的内部量子效率显着提高到近100％具有较小的AlO 6八面体，这归因于反位缺陷的减少。此外，具有优化成分的磷光体显示出高度热稳定的发射，这使得制成的pc-LED具有覆盖700-1000 nm波长范围的大功率（750.8 mW）NIR发射。这些结果可能会促进NIR pc-LED作为微型NIR光谱仪的高性能光源的开发。
更新日期：2020-06-19
中文翻译：
具有近统一内部量子效率的宽带近红外石榴石荧光粉
紧凑的，具有宽发射带的近红外（NIR）光源对于使NIR光谱与便携式设备兼容至关重要，磷光转换的发光二极管（pc-LED）是高效，低成本且紧凑的光源。然而，与用于白色LED的常规磷光体相比，开发高效且热稳定的宽带NIR磷光体更具挑战性。在此，报道了通过在Cr 3+活性石榴石Gd 3 Sc 2 Ga 3 O 12中进行阳离子取代而设计的一系列具有宽带NIR发射的固溶磷光体。通过取代ScO 6可以将Cr 3+发射的内部量子效率显着提高到近100％具有较小的AlO 6八面体，这归因于反位缺陷的减少。此外，具有优化成分的磷光体显示出高度热稳定的发射，这使得制成的pc-LED具有覆盖700-1000 nm波长范围的大功率（750.8 mW）NIR发射。这些结果可能会促进NIR pc-LED作为微型NIR光谱仪的高性能光源的开发。
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