Abstract
New Er3+-doped gadolinium borogermanate glasses were synthesized to investigate their physical, structural, optical, and luminescence properties in this work. The influence of Er2O3 concentration on those properties were studied to determine the optimum glass composition for photonics material. Glass density, molar volume, refractive index, polarizability, and field strength increase, while Er3+ inter-ionic distance decreases via adding Er2O3 concentration. From XRD and FTIR results, the tetrahedral BO4 and trigonal BO3 borates are the main structural units those connect in amorphous nature to form as a glass network. Glasses absorb the photons in ultraviolet, visible light and near-infrared region under Er3+ transitions. Glasses generate the strong infrared emission around 1.5 μm under the 4I13/2 → 4I15/2 transition of Er3+ ion. The 3.0 mol%-Er2O3 doped glass performs the highest emission intensity due to the concentration quenching effect. The luminescence decay time is shortened from ∼0.8 to ∼0.4 ms by adding Er2O3 content. Judd-Ofelt and MacCumber analysis indicate high potential of glass for using as an optical amplifier in telecommunication applications, due to its large luminescence bandwidth.
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