Optical absorption and emission spectra of Er3+ ions in Bi 2TeO5 single crystals have been studied at room temperature. Besides the 2H11/12 → 4I 15/2, 4S3/2 → 4I 15/2, and 4F9/2 → 4I 15/2, emission, that were typically strong under excitation to higher energy manifolds than the actual emission, the 4S 3/2 → 4I3/2 luminescence was also intense. The visible transitions were assigned, and Judd-Ofelt calculation was performed by fitting the experimental data set. The calculated Ω t, Judd-Ofelt intensity parameters (Ω2 = 6.98 ± 0.57 × 10-21cm2; Ω4 = 1. 74 ± 0.05 × 10-21 cm2; Ω6 = 1.23 ± 0.12 × 10-21 cm2) were consistent with the Bi2TeO5 crystal structure and the Er 3+ substitution for Bi sites. The radiative transition probabilities, the branching ratios and the radiative lifetime of the transitions of Er 3+ ions in bismuth tellurite were also calculated. The results are analyzed for potential application of Bi2TeO5:Er 3+ as a new laser material.
- Judd-Ofelt Theory
- Laser material
ASJC Scopus subject areas
- Atomic and Molecular Physics, and Optics
- Condensed Matter Physics