Abstract
Different concentrations of Ho 3+-doped lead borate titanate aluminum fluoride (LBTAFHo) glasses with chemical composition of PbO–H 3BO 3–TiO 2–AlF 3–Ho 2O 3 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 ( Ω λ=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 3+ ion concentration. To investigate the luminescence potentiality of 5F 4→ 5I 8 emission level, the effective bandwidth and the stimulated emission cross-section were determined. The quenching in experimental decay time is attributed to the resonance energy transfer among the excited Ho 3+ ions.
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