White light emission and spectroscopic studies of dysprosium doped bismuth antimony fluoroborate glasses for optoelectronic devices

Dysprosium doped Bismuth Antimony fluoroborate (BiSFB) glasses were synthesized using conventional meltquenching method. The as prepared glasses were investigated for optical absorption photoluminescence (PL) excitation, PL emission and PL decay The amorphous nature of the titled glasses were confirmed by XRD measurement. Judd-Ofelt (J-O) parameters through optical absorption are utilized to evaluate various radiative parameters such as radiative transition probability (AR), radiative lifetime (7 R), branching ratio (beta R), peak wavelength (lambda P), effective line widths (Delta lambda p) and stimulated emission cross-section (a) for the characteristic 4F9/2 -> 6H15/2,4 F9/2 -> 6H13/2 and 4F9/2 -> 6H11/2 transitions of Dy3+ions of prepared glasses. The direct and indirect band gap energies were calculated using Tauc's plot. The PL spectra under 387 nm excitation show bright yellowblue emission at 575 nm. Experimental lifetime has been evaluated using a monoexponential decay fit of the 4F9/ 2 excited state and used to understand the non-radiative emission rates and quantum efficiency. Emission crosssection, CIE coordinates and CCT values along with quantum efficiency, and non-radiative rates reveal the grander nature of the Dy3+ions doped BiSFB glasses in photonic applications.