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Structural elucidation by Raman spectroscopy and analysis of luminescence quenching by the Inokuti-Hirayama model in the Pr3+ doped multi-component silicate photonic films

2023; Elsevier BV; Volume: 171; Linguagem: Inglês

10.1016/j.optlastec.2023.110406

1879-2545

P J Gracie, D. Geetha, H. A. Wahab, I. K. Battisha,

Photonic and Optical Devices

• Multi-component Pr 3+ doped silicate glass films fabricated by the spin coating technique demonstrate textural homogeneity. • Prominent UV absorption between 250 nm and 340 nm exhibits the potentiality of the glasses as UV shielding films. • The increase in band gap energy with Pr 3+ doping is due to the Burstein-Moss shift. • The I-H model predicts a significant dipole-quadrupole interaction for the observed luminescence quenching in the highly doped film. • The NIR emission due to the transition: 3 P 0 → 3 F 4 suggests the suitability of the glass films as telecommunication waveguide lasers . Thin films of multi-component silica glasses doped with Ca 2+ and Pr 3+ modifiers were fabricated by the spin coating technique. Surface micrographic images extracted by the Field Emission Scanning Electron Microscope revealed a homogeneous texture of the films. Detailed structural analysis by Fourier Transform Raman spectroscopy confirmed the existence of Si-O-Si and polyphosphate groups in the glass matrix. The Burstein-Moss shift was evidenced with doping, by an increase in the band gap of the glass films, evaluated by Tauc's plots. The films exhibit red and near infra-red emissions (NIR), corresponding to the transitions: 3 P 0 → 3 F 2 and 3 P 0 → 3 F 4 respectively. The decay analysis by the Inokuti-Hirayama (I-H) model validated the contributions of multi-polar interactions particularly that of dipole-quadrupole mechanisms, leading to significant quenching in the highly doped film. The energy transfer efficiency between the sensitizer and activator ions, determined by the formulations of the model was 51.8 %. The decreasing lifetime of the metastable state observed in the glass films could be considered to be prospective for NIR waveguide lasers and red laser sources for optical display screens.