Broadband Near‐Infrared Cr4+‐Doped Garnet Phosphors through Divalent Calcium Charge Compensation for Advanced Crystal Fiber Amplifiers
Journal
Advanced Optical Materials
ISSN
2195-1071
2195-1071
Date Issued
2024-08-12
Author(s)
Yu‐Hsuan Hsiao
Kuan‐Chun Chen
Chun‐Ling Chien
Wen‐Tse Huang
Mikołaj Kamiński
Natalia Majewska
Sebastian Mahlik
Grzegorz Leniec
Ewa Mijowska
Sheng‐Lung Huang
Abstract
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. © 2024 Wiley-VCH GmbH.
Subjects
broadband emission
charge compensation
crystal fiber
garnet structure
near-infrared phosphor
Publisher
Wiley
Type
journal article