Er3+-ions doped lithium‑bismuth-boro-phosphate glass for 1532 nm emission and efficient red emission up conversion for telecommunication and lasing applications

Abstract

Er3+-ions doped lithium‑bismuth-boro-phosphate glass samples were prepared by conventional melt quenching method and their structural, thermal, fluorescence, and decay times of the glasses were investigated. Prepared glass samples exhibits amorphous nature and shows very good thermal stability in the temperature range of RT to 500 °C. Judd-Ofelt (JO) analysis was carried out to obtain the parameters which will evidence the glass system for fibre and lasing applications. The intensity parameters Ωλ(2,4 and 6) and stimulated-emission cross-sections were estimated for present glass system. The magnitude of Ω2 confirms the covalency nature and compared with available other host. The near infrared emission spectra were measured by 980 nm excitation in which the emission intensity is found to be at 1532 nm for the 4I11/2–4I15/2 transition. The FWHM (78 nm), σ(λp) (10.11 × 10−21 cm2), ΔG (7.93 × 10−28 cm3) and G (9.1 × 10−24 cm2 s), for 4I11/2–4I15/2 transition of present glasses are compared to some of the glass systems. Furthermore, the time decay rate found to be slight decreased from 1.04 ms to 0.90 ms when the concentration increased from 0.1 to 0.5 mol% of Er3+ ions and also all follow the single exponential behaviour which is attributed to the self-quenching effect due to the cross-relaxation channels. McCumber's theory reveals peak emission cross-section value is also good agreement with σ(λp) which is 10.11×10−21cm2. The obtained gain coefficient population inversion 40% with broad band of emission proves to consider the present system for C band amplifiers. The up conversion of luminescence spectra upon 980 nm excitation exhibits red emission at 665 nm due to 4F9/2 - 4I15/2 transitions also two photon absorption was obtained for power dependence up conversion.