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Ho 3+ ‐doped strontium–aluminium–bismuth–borate glasses for green light emission
Author(s) -
Rajesh D.,
Dhamodhara Naidu M.,
Ratnakaram Y. C.,
Balakrishna A.
Publication year - 2014
Publication title -
luminescence
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.428
H-Index - 45
eISSN - 1522-7243
pISSN - 1522-7235
DOI - 10.1002/bio.2632
Subject(s) - chromaticity , emission spectrum , analytical chemistry (journal) , luminescence , radiative transfer , boron , materials science , absorption spectroscopy , strontium , bismuth , stimulated emission , spectral line , chemistry , optics , physics , laser , optoelectronics , organic chemistry , chromatography , astronomy , metallurgy
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 diffraction 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, Ω λ (λ = 2, 4 and 6). Using J‐O intensity parameters, radiative properties such as spontaneous transition probabilities ( A R ), branching ratios (β R ) and radiative lifetimes (τ R ) were determined. From the emission spectra, a strong green emission nearly at 549 nm corresponding to the transition, 5 S 2 ( 5 F 4 )→ 5 I 8 was observed. Emission peak positions (λ P ), effective bandwidths (Δλ eff ) and stimulated emission cross‐sections (σ p ) were calculated for the observed emission transitions, 5 F 3 → 5 I 8 , 5 S 2 ( 5 F 4 )→ 5 I 8 and 5 F 5 → 5 I 8 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 1.5 mol% of Ho 3+ has better emission properties. Copyright © 2014 John Wiley & Sons, Ltd.