Concentration‐dependent studies of Nd³⁺‐doped zinc phosphate glasses for NIR photoluminescence at 1.05 μm

Abstract

Nd -doped lead-free zinc phosphate glasses with the chemical compositions (60-x) NH H PO + 20ZnO + 10BaF + 10NaF + xNd O (where x = 0.5, 1.0, 1.5, 2.0 and 2.5 mol%) were prepared using a melt quenching technique. Vibrational bands were assigned and clearly elucidated by Raman spectral profiles for all the glass samples. Judd-Ofelt (J-O) intensity parameters (Ω : λ = 2, 4, 6) were obtained from the spectral intensities of different absorption bands of Nd ions. Radiative properties such as radiative transition probabilities (A ), radiative lifetimes (τ ) and branching ratios (β ) for different excited states were calculated using J-O parameters. The near infrared (NIR) photoluminescence spectra exhibited three emission bands ( F level to I , I and I states) for all the concentrations of Nd ions. Various luminescence properties were studied by varying the Nd concentration for the three spectral profiles. Fluorescence decay curves of the F level were recorded. The energy transfer mechanism that leads to quenching of the F state lifetimes was discussed at higher concentration of Nd ions. These glasses are suggested as suitable hosts to produce efficient lasing action in NIR region at 1.05 μm.

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