Dual Divalent Cations-Doped Near-Infrared Garnet Phosphors with Charge Compensation and Surface Modification for Next-Generation Broadband Fiber Amplifiers

Near-infrared (NIR)-II phosphor-converted light-emitting diodes (NIR-II pc-LEDs) have been extensively developed using NIR-II phosphor with commercial LEDs. However, the application of NIR-II phosphor in optical communications remains underexplored. In this work, a phosphor series of Y3−x−yAl4.9O12:0.1Cr,xCa2+,yMg2+ is simultaneously tuned with Mg2+ and Ca2+, resulting in Y2.76Al4.9O12:0.1Cr,0.16Ca2+,0.08Mg2+ (YAG:0.1Cr,0.16Ca,0.08Mg) crystal fiber, with a length of 2.65 cm and a diameter of 216.95 µm, is grown from the optimized phosphor. The fabrication process involved phosphor synthesis, pellet production, and crystal fiber growth using the laser-heated pedestal growth method. Proposed dual cations modification allowed to i) enhance NIR-II broadband emission in 1100–1600 nm by improving the structure due to the incorporation of Mg2+ ions and ii) provide additional tetrahedral sites for Cr4+ ions via Mg2+/Ca2+ introduction. The YAG:0.1Cr,0.16Ca,0.08Mg crystal fiber exhibits promoted luminescence compared with the commercial Cr4+-doped Y3Al5O12 crystal fiber, indicating its potential as a fiber amplifier in optical communications.
That dataset provides the raw data of near-infrared room-temperature excitation and emission spectra and decay profiles, temperature-dependent photoluminescence in near-infrared range and decay profiles, and high-pressure-dependent near-infrared photoluminescence of  Y3−x−yAl4.9O12:0.1Cr,xCa2+,yMg2+
Related publication: Hsiao, Y.-H.; Chen, K.-C.; Chien, C.-L.; Majewska, N.; Kamiński, M.; Mahlik, S.; Leniec, G.; Mijowska, E.; Huang, S.-L.; Liu, R.-S. Dual Divalent Cations-Doped Near-Infrared Garnet Phosphors with Charge Compensation and Surface Modification for Next-Generation Broadband Fiber Amplifiers. Laser & Photonics Reviews n/a (n/a), e01465. https://doi.org/10.1002/lpor.202501465.
Funding: This work was financially supported by the National Science Center, Poland Grant Opus No. 2019/33/B/ST3/00406, and the National Centre for Research and Development, Poland Grant No. POLTAJ11/2023/41/IRPA/2024.