Bismuth‐doped glasses and fibers with broadband near‐infrared (NIR) emission have garnered much attention on account of their potential applications in new fiber lasers and broadband amplifiers. Yet the realization of high gain from Bi‐doped fibers and highly efficient NIR emission from Bi‐doped glasses are still a stubborn puzzle. The enhancement of Bi NIR emission is normally based on modifying the glass composition and topology, which will change the structure of the glass over a wide range and alter the thermal or mechanical properties of the glass simultaneously, making it more complicated for the designing and fabricating of Bi fibers with good performance. Here, we find that a trace addition of Si₃N₄ can efficiently enhance the Bi NIR emission without changing the glass structure significantly, right followed by spectral and structural analysis. ²⁷Al NMR measurement reveals that the short‐ to medium‐range order of this glass is unchanged. The EPMA measurement confirms the homogeneity of fabricated glass. The great enhancement and red‐shift under blue light excitation may originate from the conversion of Bi active centers to low valence. Our results indicate that the trace addition of nitride could be a facile and maneuverable way to control the valence of active ions in glasses, which may contribute to improving the performance of photonic glasses.

中文翻译：

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增强铋掺杂激光眼镜的宽带近红外发射的新策略

宽带近红外（NIR）发射的掺铋玻璃和光纤因其在新型光纤激光器和宽带放大器中的潜在应用而备受关注。然而，从双掺杂光纤获得高增益和从双掺杂玻璃获得高效的近红外发射仍然是一个顽固的难题。Bi NIR发射的增强通常是基于改变玻璃的成分和拓扑结构，这将在很大范围内改变玻璃的结构并同时改变玻璃的热或机械性能，从而使其设计和制造更加复杂Bi纤维具有良好的性能。在这里，我们发现微量的Si ₃ N ₄可以有效地提高Bi NIR发射，而不会显着改变玻璃结构，随后进行光谱和结构分析。²⁷ Al NMR测量表明，该玻璃的短至中阶顺序没有变化。EPMA测量证实了人造玻璃的均质性。蓝光激发下的极大增强和红移可能源于Bi活性中心向低价态的转化。我们的结果表明，微量添加氮化物可能是控制玻璃中活性离子的价态的便捷方法，这可能有助于提高光子玻璃的性能。