Spectroscopic study of Er3+ doped borate glass system for green emission device, NIR laser, and optical amplifier applications

Nimitha S. Prabhu, A. N. Meza-Rocha, O. Soriano-Romero, U. Caldiño, E. F. Huerta, C. Falcony, M. I. Sayyed, Hanan Al-Ghamdi, Aljawhara H. Almuqrin, Sudha D. Kamath

Research output: Contribution to journalArticlepeer-review

Abstract

The 10BaO–20ZnO–20LiF-(50-x)B2O3-xEr2O3 (x = 0, 0.1, 0.5, 0.7, and 1.0 mol %) glass system was studied for green emission device, NIR laser, and optical amplifier applications. The impact of Er3+ doping was assessed through structural, optical, and thermal properties. The Er3+ ions behaved as network modifiers and decreased the network rigidity by the transformation of [BO4]→[BO3] and Non-Bridging Oxygens. This was consistent with the decrease in the glass transition temperature. Ten absorption peaks of Er3+ ion equivalent to transitions from 4I15/2 to various excited levels were quantified through their oscillator strengths. Through broadband impedance spectroscopy, the insulating property of the glass system was authenticated by the persistence of dc-conductivity in the order of 10−10 Scm−1 up to 523 K. With 378 nm excitation, a violet emission (2H9/24I15/2) and two intense green emissions (2H11/24I15/2, 4S3/24I15/2) were noticed. The NIR emission (4I13/24I15/2) was observed at 1531 nm with 378 and 980 nm excitations and the corresponding decay curves were recorded. The Inokuti-Hirayama model indicated the increase in the energy transfer and reduction in critical distance amid the Er3+ ions with doping leading to energy migration through cross-relaxations and lifetime quenching. The laser parameters were determined from Fuchtbauer-Ladenburg theory. The color coordinates of the samples were lying in the green region, with purity >89% and CCT >6000 K. The gain coefficient from McCumber theory was positive for a population inversion >50%, with a wide gain between 1460 and 1565 nm, extending the application of the glass system as an optical amplifier in the S + C communication window.

Original languageEnglish
Article number118216
JournalJournal of Luminescence
Volume238
DOIs
Publication statusPublished - 10-2021

All Science Journal Classification (ASJC) codes

  • Biophysics
  • Atomic and Molecular Physics, and Optics
  • Chemistry(all)
  • Biochemistry
  • Condensed Matter Physics

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