Abstract
The results presented in this communication concern visible and near-IR emission of Pr3+ ions in selected inorganic glasses, i.e., borate-based glass with Ga2O3 and BaO, lead-phosphate glass with Ga2O3, gallo-germanate glass modified by BaO/BaF2, and multicomponent fluoride glass based on InF3. Glasses present several emission bands at blue, reddish orange, and near-infrared spectral ranges, which correspond to 4f–4f electronic transitions of Pr3+. The profiles of emission bands and their relative intensity ratios depend strongly on glass-host. Visible emission of Pr3+ ions is tuned from red/orange for borate-based glass to nearly white light for multicomponent fluoride glass based on InF3. The positions and spectral linewidths for near-infrared luminescence bands at the optical telecommunication window corresponding to the 1G4 → 3H5, 1D2 → 1G4, and 3H4 → 3F3,3F4 transitions of Pr3+ are dependent on glass-host matrices and excitation wavelengths. Low-phonon fluoride glasses based on InF3 and gallo-germanate glasses with BaO/BaF2 are excellent candidates for broadband near-infrared optical amplifiers. Spectroscopic properties of Pr3+-doped glasses are compared and discussed in relation to potential optical applications.
Highlights
Praseodymium-doped inorganic glasses, due to several visible and near-infrared emission transitions, are interesting from the spectroscopic point of view
Further comprehensive investigations indicate that the emission bands associated with electronic transitions of Pr3+ ions are enhanced in the presence of silver [32,33,34,35] or gold [36] nanoparticles embedded into glass matrices
We present comparative studies on selected inorganic glasses containing Pr3+, i.e., borate glass with Ga2O3 and BaO, lead-phosphate glass with Ga2O3, gallo-germanate glass modified by BaO/BaF2, and multicomponent fluoride glass based on InF3
Summary
Praseodymium-doped inorganic glasses, due to several visible and near-infrared emission transitions, are interesting from the spectroscopic point of view. The changes in luminescence decays, profiles of emission bands, and their relative intensity ratios will be stronger for glass-host matrices, including different glass-formers. These effects were examined previously for some glass systems singly doped with Tm3+ [43], Sm3+ [44], Dy3+ [45], Yb3+ [46], and glass co-doped with Yb3+/Er3+ [47]. The intention of our work is to present how kinds of glass-host matrix influence the spectral profiles of luminescence bands of Pr3+ ions and their relative intensity ratios measured in the visible and near-infrared ranges. Based on spectroscopic parameters of Pr3+ ions, the glass-host matrices are selected as promising materials for multicolor visible light sources or broadband near-infrared optical amplifiers
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