Super broadband near‐infrared (NIR) phosphor converted light‐emitting diodes (pc‐LEDs) are future light sources in NIR spectroscopy applications such as food testing. At present, a few blue LED excitable super broadband NIR phosphors (bandwidth > 300 nm) have been developed producing the NIR output powers below 26 mW at 100 mA input current after LED packaging. Here, an efficient super broadband NIR phosphor achieved by doping Yb³⁺ is reported in the NIR Ca₂LuZr₂Al₃O₁₂:Cr³⁺ (CLZA:Cr³⁺) garnet phosphor developed previously. Benefited from the superposition of Cr³⁺ emission and highly efficient Yb³⁺ emission excited by energy transfer from Cr³⁺, the codoped CLZA:Cr³⁺,Yb³⁺ phosphor shows a bandwidth of 320 nm and an internal quantum efficiency of 77.2% both higher than that (150 nm and 69.1%) of singly doped CLZA:Cr³⁺ phosphor. The codoped phosphor converts LED produced 41.8 mW NIR output at 100 mA input current. The pc‐LED as a light source is also well applied to the NIR transmission spectra measurement of water. The results indicate the great potential of CLZA:Cr³⁺,Yb³⁺ phosphor in super broadband NIR pc‐LED applications.

中文翻译：

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高效的超宽带NIR Ca2LuZr2Al3O12：Cr3 +，Yb3 +石榴石荧光粉，用于PC-LED光源，用于近红外光谱应用

超宽带近红外（NIR）荧光粉转换的发光二极管（pc-LED）是近红外光谱应用（例如食品测试）中的未来光源。目前，已经开发出了几种蓝色LED可激发的超宽带NIR荧光粉（带宽> 300 nm），在LED封装后，在100 mA输入电流下产生的NIR输出功率低于26 mW。在此，先前开发的NIR Ca ₂ LuZr ₂ Al ₃ O ₁₂：Cr ³⁺（CLZA：Cr ³⁺）石榴石荧光粉中报道了通过掺杂Yb ³⁺而获得的高效超宽带NIR荧光粉。得益于Cr ³⁺排放和高效Yb ³⁺的叠加Cr ³⁺，共掺杂的CLZA：Cr ³⁺，Yb ³⁺荧光粉因能量转移而激发发射，其带宽为320 nm，内部量子效率分别比单掺杂的150 nm和69.1％高77.2％。 CLZA：Cr ³⁺荧光粉。共掺杂磷光体可在100 mA输入电流下转换LED产生的41.8 mW NIR输出。pc-LED作为光源也很好地应用于水的近红外透射光谱测量。结果表明，CLZA：Cr ³⁺，Yb ³⁺荧光粉在超宽带NIR pc-LED应用中具有巨大的潜力。