Broadband Near-Infrared Cr4+-Doped Garnet Phosphors through Divalent Calcium Charge Compensation for Advanced Crystal Fiber Amplifiers

Near-infrared-II (NIR-II) phosphors are extensively used as NIR phosphor-converted light-emitting diodes across various applications. Nonetheless, their application in fiber communication remains underexplored. Furthermore, efficiency challenges persist in developing broadband NIR crystal fiber amplifiers. A series of the Y3−yAl5−xO12:xCr,yCa2+ phosphors with boosted Cr4+ concentration via calcium charge compensation is synthesized, and the optimized sample is fabricated to crystal fibers to reveal the application of the NIR-II phosphors to fiber communication. The fabricated Cr4+-doped crystal fiber, exhibiting broadband Cr4+ emission within 1100–1600 nm, effectively covers the high-transmission loss region caused by water absorption in the telecommunication band. Comprehensive characterization and analyses of the Cr4+ are discussed. Y2.84Al4.9O12:0.1Cr,0.16Ca2+ crystal fiber, fabricated through phosphor synthesis, pellets’ production, and the laser-heated pedestal growth method, exhibits superior photoluminescence compared to the commercial Cr4+-doped Y3Al5O12 crystal fiber. Here the potential of NIR-II phosphors is highlighted in enhancing fiber communication and valuable insights for their future application are provided.
That dataset provides the raw data of room-temperature excitation and emission spectra and decay profiles, temperature-dependent photoluminescence and decay profiles, and high-pressure-dependent photoluminescence of Y3−yAl5−xO12:xCr,yCa2+.

近红外二区（Near-infrared-II, NIR-II）荧光粉作为近红外荧光转换型发光二极管，已在诸多应用场景中得到广泛使用。然而其在光纤通信领域的应用仍有待深入挖掘。此外，开发宽带近红外晶体光纤放大器仍面临效率层面的挑战。本研究通过钙离子电荷补偿策略提升Cr⁴+掺杂浓度，合成了一系列Y₃₋ᵧAl₅₋ₓO₁₂:xCr,yCa²+荧光粉；将优化后的样品制备为晶体光纤，以探究NIR-II荧光粉在光纤通信中的应用潜力。所制备的Cr⁴+掺杂晶体光纤可在1100~1600 nm波段产生宽带Cr⁴+发射，有效覆盖通信波段内由水分子吸收导致的高传输损耗区间。本文对Cr⁴+的各项表征与分析进行了详细讨论。通过荧光粉合成、坯体制备及激光加热基座法制备的Y₂.₈₄Al₄.₉O₁₂:0.1Cr,0.16Ca²+晶体光纤，其光致发光性能优于商用Cr⁴+掺杂Y₃Al₅O₁₂晶体光纤。本研究凸显了NIR-II荧光粉在光纤通信性能提升方面的应用潜力，并为其后续应用提供了具有参考价值的研究思路。
本数据集包含Y₃₋ᵧAl₅₋ₓO₁₂:xCr,yCa²+的室温激发光谱、发射光谱及衰减曲线，温变光致发光光谱与衰减曲线，以及高压依赖光致发光光谱的原始实验数据。