Investigations on the physical, structural, optical and photoluminescence behavior of Er 3+ ions in lithium zinc fluoroborate glass system

Nimitha S. Prabhu, Vinod Hegde, M. I. Sayyed, E. Şakar, Sudha D. Kamath

Research output: Contribution to journalArticle

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Abstract

Family of lithium zinc fluoroborate glasses with 15ZnF 2 -10BaO-8Al 2 O 3 –12Li 2 O-(55-x) B 2 O 3 -xEr 2 O 3 (x = 0.5, 0.7, 1.1, 1.3 and 1.5 mol%) composition were prepared by conventional melt-quench method. The glasses were characterized to study their structural, physical, optical and radiative properties. The amorphous characteristic of glass was noticed in X-Ray Diffraction pattern. A modification in structure was observed as density values increased with Er 2 O 3 content. UV–Vis–NIR transitions of Er 3+ in the host matrix were identified through absorption spectra. Covalent nature of bonding between Er 3+ ions and their surrounding ligands was observed through bonding parameter and Judd-Ofelt parameters. Red shift of the fundamental absorption edge in the absorption spectra and decreasing indirect and direct band gaps with increasing Er 3+ concentration jointly confirmed the role of Er 3+ ions as network modifier. Hypersensitive transitions of Er 3+ ion namely 4 I 15/22 H 11/2 & 4 I 15/24 G 11/2 were interpreted through their higher oscillator strengths when compared to other transitions. Emission spectra recorded at 980 nm excitation showed a peak corresponding to 4 I 13/24 I 15/2 NIR transition of erbium ion. Stimulated emission cross section of Er0.5 sample, gain bandwidth and Figure of Merit were found to be 16.79 × 10 −21 cm 2 , 1225.83 × 10 −28 cm 3 and 37.36 × 10 −24 cm 2 s respectively. Photoluminescence decay curve of Er0.5 sample was well-fitted to single exponential first order function. The experimental decay lifetime τ exp for the 4 I 13/2 level was measured to be 0.34 ms. The wide frequency range of FWHM (1.02–1.67 × 10 13 Hz) and high values of radiative parameters make the glass a suitable candidate as optical amplifier and NIR laser material.

Original languageEnglish
Pages (from-to)7-15
Number of pages9
JournalInfrared Physics and Technology
Volume98
DOIs
Publication statusPublished - 01-05-2019

Fingerprint

Lithium
Zinc
Photoluminescence
lithium
zinc
Ions
photoluminescence
Glass
glass
Absorption spectra
ions
Erbium
absorption spectra
Stimulated emission
Light amplifiers
laser materials
decay
Electron transitions
Full width at half maximum
stimulated emission

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

Cite this

@article{329370e4b9c245ec9eae855bd6ca56e9,
title = "Investigations on the physical, structural, optical and photoluminescence behavior of Er 3+ ions in lithium zinc fluoroborate glass system",
abstract = "Family of lithium zinc fluoroborate glasses with 15ZnF 2 -10BaO-8Al 2 O 3 –12Li 2 O-(55-x) B 2 O 3 -xEr 2 O 3 (x = 0.5, 0.7, 1.1, 1.3 and 1.5 mol{\%}) composition were prepared by conventional melt-quench method. The glasses were characterized to study their structural, physical, optical and radiative properties. The amorphous characteristic of glass was noticed in X-Ray Diffraction pattern. A modification in structure was observed as density values increased with Er 2 O 3 content. UV–Vis–NIR transitions of Er 3+ in the host matrix were identified through absorption spectra. Covalent nature of bonding between Er 3+ ions and their surrounding ligands was observed through bonding parameter and Judd-Ofelt parameters. Red shift of the fundamental absorption edge in the absorption spectra and decreasing indirect and direct band gaps with increasing Er 3+ concentration jointly confirmed the role of Er 3+ ions as network modifier. Hypersensitive transitions of Er 3+ ion namely 4 I 15/2 → 2 H 11/2 & 4 I 15/2 → 4 G 11/2 were interpreted through their higher oscillator strengths when compared to other transitions. Emission spectra recorded at 980 nm excitation showed a peak corresponding to 4 I 13/2 → 4 I 15/2 NIR transition of erbium ion. Stimulated emission cross section of Er0.5 sample, gain bandwidth and Figure of Merit were found to be 16.79 × 10 −21 cm 2 , 1225.83 × 10 −28 cm 3 and 37.36 × 10 −24 cm 2 s respectively. Photoluminescence decay curve of Er0.5 sample was well-fitted to single exponential first order function. The experimental decay lifetime τ exp for the 4 I 13/2 level was measured to be 0.34 ms. The wide frequency range of FWHM (1.02–1.67 × 10 13 Hz) and high values of radiative parameters make the glass a suitable candidate as optical amplifier and NIR laser material.",
author = "Prabhu, {Nimitha S.} and Vinod Hegde and Sayyed, {M. I.} and E. Şakar and Kamath, {Sudha D.}",
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Investigations on the physical, structural, optical and photoluminescence behavior of Er 3+ ions in lithium zinc fluoroborate glass system. / Prabhu, Nimitha S.; Hegde, Vinod; Sayyed, M. I.; Şakar, E.; Kamath, Sudha D.

In: Infrared Physics and Technology, Vol. 98, 01.05.2019, p. 7-15.

Research output: Contribution to journalArticle

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T1 - Investigations on the physical, structural, optical and photoluminescence behavior of Er 3+ ions in lithium zinc fluoroborate glass system

AU - Prabhu, Nimitha S.

AU - Hegde, Vinod

AU - Sayyed, M. I.

AU - Şakar, E.

AU - Kamath, Sudha D.

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