Luminescence properties of Dy3+ doped zinc–aluminum–sodium–phosphate (ZANP) glasses for white light applications.

The structural and optical properties of trivalent dysprosium (Dy 3+ )-doped zinc– aluminum–sodium–phosphate (ZANP) glasses have been investigated using XRD, FTIR, absorption, emission spectra and decay curve. The XRD profiles and SEM images confirm the glassy nature of the investigated glass samples. FTIR spectra reveal the presence of PO 4 units along with OH − groups in the glasses. The absorption spectra of Dy 3+ showed eight absorption bands with hypersensitive at 1272 nm ( 6 H 15/2 → 6 F 11/2 ) and three PL emission bands at 485 nm ( 4 F 9/2 → 6 H 15/2 ), 576 nm, ( 4 F 9/2 → 6 H 13/2 ) and 665 nm ( 4 F 9/2 → 6 F 11/2 ). The luminescence intensity ratio of 4 F 9/2 → 6 H 13/2 to 4 F 9/2 → 6 H 15/2 transitions of Dy 3+ in ZANP glasses gives feasibility of extracting white light. The experimental branching ratios and stimulated emission cross-sections are higher for 4 F 9/2 → 6 H 13/2 transition. The lifetime of the decay is obtained by taking the first e-folding times of the decay curves and is found to decrease with increase of Dy 3+ ions concentration. The decay curves are found to be perfectly single exponential for samples upto1.5 mol% Dy 3+ ion concentrations. The non-exponential curve is obtained at 2.0 mol% of Dy 3+ ion concentration, which indicates the energy transfer between the donor and acceptor. [ABSTRACT FROM AUTHOR]