Broadband near-infrared (NIR)-emitting materials are crucial components of the next generation of smart NIR light sources based on blue light-emitting diodes (LEDs). Here, we report a Te cluster-doped borate glass, which exhibits ultra-broadband emission around 980 nm with a full-width at half-maximum (FWHM) of 306 nm under blue light excitation. We propose adjustments of glass chemistry and processing condition as a means for topo-chemical tailoring of the NIR photoemission characteristics in such materials. Through implementing strongly reducing conditions during glass melting, Te clusters with broad NIR photoluminescence can be generated and stabilized once the melt is vitrified to the glassy state. Tunability of the NIR emission peak over the wavelength range of 904 to 1026 nm is possible in this way, allowing for fine adjustments of spectral properties relative to the stretching vibrations of common chemical bonds, for example, in water, proteins, and fats. This potentially enables high sensitivity in NIR spectroscopy. We further demonstrate potential application of glass-converted LEDs in night vision.

中文翻译：

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用于夜视和 NIR 光谱应用的智能光源的宽带 NIR 发射 Te 簇掺杂玻璃

宽带近红外 (NIR) 发射材料是基于蓝色发光二极管 (LED) 的下一代智能近红外光源的重要组成部分。在这里，我们报告了一种掺 Te 簇的硼酸盐玻璃，它在蓝光激发下表现出约 980 nm 的超宽带发射，半峰全宽 (FWHM) 为 306 nm。我们建议调整玻璃化学和加工条件，作为对此类材料的近红外光发射特性进行拓扑化学调整的一种手段。通过在玻璃熔化过程中实施强还原条件，一旦熔体玻璃化至玻璃态，就可以产生并稳定具有宽 NIR 光致发光的 Te 簇。通过这种方式，可以在 904 到 1026 nm 的波长范围内调节近红外发射峰，允许相对于常见化学键的伸缩振动对光谱特性进行微调，例如在水、蛋白质和脂肪中。这可能使近红外光谱具有高灵敏度。我们进一步展示了玻璃转换 LED 在夜视中的潜在应用。