Optical and thermal properties of luminescent Er3+-doped lithium tellurite glasses. (2nd November 2021)

• Record Type: Journal Article
• Authors: Hirdesh, ; Khanna, Atul
• Is Part Of: Phase transitions. Volume 94:Number 11(2021)
• Page Start: 856
• Page End: 870
• Publication Date: 2021-11-02
• Subjects: Tellurite glasses -- Structural and thermal properties -- UV–visible spectra -- Er3+ downconversion -- Raman and photoluminescence spectroscopy; Phase transformations (Statistical physics) -- Periodicals; 530.47405
• DOI: 10.1080/01411594.2021.1979548
• Languages: English
• ISSNs: 0141-1594

Abstract

ABSTRACT: The effects of Er 3+ concentration on the short-range order, thermal and luminescence properties of lithium tellurite glasses (xEr2 O3 -24Li2 O-(75-x)TeO2, x = 1–5 mol%) were studied by X-ray diffraction, density measurements, differential scanning calorimetry, UV–visible, Raman and photoluminescence spectroscopic techniques. The incorporation of 1–5 mol% Er2 O3 in the lithium tellurite glass system increases density steadily from 4.97 to 5.21 g cm −3, it decreases the average Te-O co-ordination number from 3.51 to 3.44 due to short-range structural transformation: TeO4 → TeO3 units, and it enhances the glass transition temperature from 264°C to 298°C. The glass sample with 1 mol% Er2 O3 produces maximum green light emission with 89% color purity and fluorescence quantum yield of 3.05%. On increasing the Er2 O3 concentration from 1 to 5 mol%, very strong concentration quenching effects on the luminescence intensity are found.