Gupta, Gaurav and Balaji, Sathravada and Biswas, Kaushik and Annapurna, K (2019) Enhanced luminescence at 2.88 and 2.04 mu m from Ho3+/Yb3+ codoped low phonon energy TeO2-TiO2-La2O3 glass. AIP Advances, 9 (4). Art No-045201. ISSN 2158-3226

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Abstract

The high phonon energy and short infrared cut-off wavelength of conventional oxide glass (or crystal) hosts are the limitations to achieve mid-infrared (MIR, ?=2.5 mu m) luminescence. In present study, the luminescence performance of low phonon and non-conventional TeO2-TiO2-La2O3-based glass (TTL) host doped with Ho3+ and Ho3+/Yb3+ has been investigated, for visible to MIR range. The MIR emission band with peak at 2.88 mu m (Ho3+:I-5(6)-> I-5(7)) and NIR band at 2.04 mu m (Ho3+:I-5(7)-> I-5(8)) has been realized from Ho3+ singly doped TTL glass due to low phonon energy and extended transmission window of the host. Intensity of MIR and NIR emission bands have enhanced significantly in Ho3+/Yb3+: TTL glass under Yb3+ excitation, signifying an efficient Yb3+?Ho3+ energy transfer. The Judd-Ofelt analysis, on Ho3+ absorption characteristics reveals relatively better radiative transition probability (34.4s(-1)) and branching ratio (10.5%), which is associated to Ho3+:I-5(6)-> I-5(7) transition. The effective bandwidth of 2.88 mu m emission band is 180nm, with stimulated emission cross-section is 4.26x10-21cm(2) and its gain bandwidth has been evaluated as 7.67x10-26cm(.) For 2.04 mu m (Ho3+:5I7?5I8) emission band, the effective bandwidth of 160.5nm and gain bandwidth of 7.26x10-26cm3 have been accomplished. The non-resonant Forster-Dexter method has been applied to Ho3+/Yb3+: TTL glass on emission (donor, Yb3+) and absorption (acceptor, Ho3+) cross sections. The evaluated donor-donor (CDD) and donor-acceptor (CDA) energy transfer micro-parameters are 1.02x10-38 and 5.88x10-41cm6/s respectively while, maximum energy transfer efficiency has been 80%. In concise, Ho3+/Yb3+ codoped TeO2-TiO2-La2O3 glass host has revealed its potential for MIR to NIR photonic applications. (C) 2019 Author(s). All article content, except where otherwise noted, is licensed under a Creative Commons Attribution (CC BY) license (http://creativecommons.org/licenses/by/4.0/).

Item Type:	Article
Subjects:	Glass
Divisions:	Glass
Depositing User:	Bidhan Chaudhuri
Date Deposited:	14 Nov 2019 09:36
Last Modified:	14 Nov 2019 09:36
URI:	http://cgcri.csircentral.net/id/eprint/4599

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