Structural, luminescence and NMR studies on Nd3+-doped sodium–calcium-borate glasses for lasing applications. Issue 17 (1st December 2020)

• Record Type: Journal Article
• Authors: James, Jaimson T.; Jose, Jephin K.; Manjunatha, M.; Suresh, Keenatampalle; Madhu, A.
• Is Part Of: Ceramics international. Volume 46:Issue 17(2020)
• Page Start: 27099
• Page End: 27109
• Publication Date: 2020-12-01
• Subjects: Neodymium ions -- Borate glasses -- XRD -- NMR -- Raman -- Lasers; Ceramics -- Periodicals; Céramique industrielle -- Périodiques; Ceramics; Periodicals; Electronic journals; 666
• DOI: 10.1016/j.ceramint.2020.07.187
• Languages: English
• ISSNs: 0272-8842

Abstract

Abstract: In this work, Neodymium (Nd 3+ ) -doped borate glasses were synthesised by melt-quenching method and their structural as well as optical properties were analysed through XRD, Raman, NMR, DSC, UV–Visible, luminescence and decay studies for the possible application as laser gain medium. DSC and XRD results revealed that the glasses have high transition temperature and are in amorphous nature, respectively. The vibrational characteristics of the host matrices as well as the effect of Nd 3+ incorporation were analysed by using Raman spectra, which exhibit majorly borate groups as supported by NMR results. The band gap energy of the glasses decreases with an increase in Nd 3+ concentration. Using Judd-Oflet theory the characteristic intensity parameters (Ωλ, λ = 2, 4 and 6) were calculated and further used for calculating the various radiative parameters from the emission spectra. The emission cross-section (σem ) was estimated as high as 1.15 × 10 −20 cm 2 from the Füchtbauer–Landenburg (FL) equation for the dominant 4 F3/2 → 4 I11/2 (1056 nm) transition. The effect of Nd 3+ concentration on the lifetime of the 4 F3/2 luminescent level was analysed from the decay curve analyses. From which, the corresponding quantum efficiency (η) was estimated and found as high as 54%. The investigated result suggests the prepared glasses can be utilized as gain medium to generate laser at around 1.05 μm. Graphical abstract: Image 1