Ho3+‐doped strontium–aluminium–bismuth–borate glasses for green light emission

Strontium-aluminium-bismuth-borate glasses (SAlBiB) doped with different concentrations of Ho 3+ were prepared using conventional melt quenching technique and their structural and optical properties investigated. X-ray diffrac- tion and scanning electron microscopy analysis were used to study the structural properties. Optical properties were studied by measuring the optical absorption and visible luminescence spectra. The Judd-Ofelt (J-O) theory was applied to evaluate J-O intensity parameters, Ωλ (λ=2, 4 and 6). Using J-O intensity parameters, radiative properties such as spontaneous transition probabilities (AR), branching ratios (βR) and radiative lifetimes (τR) were determined. From the emission spectra, a strong green emission nearly at 549nm corresponding to the transition, 5 S2( 5 F4)→ 5 I8 was observed. Emission peak posi- tions (λP), effective bandwidths (Δλeff) and stimulated emission cross-sections (σp) were calculated for the observed emission transitions, 5 F3→ 5 I8, 5 S2( 5 F4)→ 5 I8 and 5 F5→ 5 I8 of Ho 3+ in all the glass matrices. Chromaticity color coordinates were calculated using the emission spectra. The experimental results suggest that SAlBiB glass matrix with 1.5mol% of Ho 3+ has better emis-