Title
Judd-Ofelt parametrization and radiative analysis of Dy3+ ions doped Sodium Bismuth Strontium Phosphate glasses
Author
Haruka George, Nisha Deop, Sumandeep Kaur, Aman Prasad, M. Sreenivasulu, M. Jayasimhadri, A. S. Rao
Year
2019
Journal
Journal of Luminescence
Abstract
This paper focus on spectroscopic analysis of Sodium Bismuth Strontium Phosphate (NaBiSrP) glasses doped with dysprosium (Dy3+) ions using X-ray Diffraction (XRD), Raman Spectroscopy, Fourier Transform-Infrared (FT-IR) Spectroscopy, Photoluminescence (PL) Spectroscopy and decay spectral measurements. Excitation spectra of the glasses under 575 nm emission possess a sharp band corresponding to 6H15/2 → 6P7/2 transition (350 nm). Subsequently, emission spectra recorded under 350 nm excitation exhibit sharp bands at 480 and 575 nm. The Judd-Ofelt (J-O) theory has been applied to the measured energies of the absorption bands/oscillator strengths to study various radiative parameters such as radiative and total transition probabilities (AR &AT), branching ratios (βR) and radiative lifetimes (τR) for the prominent fluorescent levels of Dy3+ doped NaBiSrP glasses. It was observed that glass D has got highest value of Ω2 signalling high symmetry of crystal field of Dy3+ ions and a maximum intensity for hypersensitive transition. PL decay analysis reveal experimental lifetimes of 4F9/2 energy level under 350 nm excitation decreases with increase in Dy3+ ion concentration indicating the energy transfer between Dy3+ ions. The Inokuti-Hirayama (I–H) curve fitting was also done for the glass with the highest Dy3+ ion concentration showing dipole-dipole interaction. From the above-mentioned results, it is apt to say that the as synthesized phosphate glasses doped with Dy3+ ions are quite suitable for designing the white light emitting diodes (wLEDs) and other optoelectronic devices.
Instrument
FP-8300
Keywords
Fluorescence, Photoluminescence, Optical properties, Materials