An investigation on visible luminescence of Ho3+ activated LBTAF glasses

Different concentrations of Ho 3 þ -doped lead borate titanate aluminum fluoride (LBTAFHo) glasses with chemical composition of PbO–H3BO3–TiO2–AlF3–Ho2O3 were prepared by the melt quenching method. The spectral properties were investigated using the absorption, emission and decay measurements. The experimental oscillator strengths were calculated from the area under the absorption bands. Applying Judd–Ofelt theory, the intensity parameters (Ol ¼ 2, 4, 6) were calculated, by the least square fit approach from which the radiative transition rates, luminescence branching ratios and radiative decay times were determined. The photoluminescence spectra revealed the quenching of luminescence intensity beyond 1.0 mol% of Ho