Oxide phosphors for efficient light upconversion: Yb3+ and Er3+ co-doped Ln2BaZnO5 (Ln = Y, Gd)

Isabelle Etchart; Arnaud Huignard; Mathieu Bérard; Muhammad N. Nordin; Ignacio Hernández; Richard J. Curry; William P. Gillin; Anthony K. Cheetham

doi:10.1039/C000127A

Oxide phosphors for efficient light upconversion: Yb³⁺ and Er³⁺ co-doped Ln₂BaZnO₅ (Ln = Y, Gd)†

Isabelle Etchart,^ab Arnaud Huignard,^b Mathieu Bérard,^b Muhammad N. Nordin,^c Ignacio Hernández,^d Richard J. Curry,^c William P. Gillin^d and Anthony K. Cheetham*^a

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* Corresponding authors

^a Materials Science and Metallurgy Department, University of Cambridge, Pembroke Street, UK
E-mail: akc30@cam.ac.uk

^b Saint-Gobain Recherche, 39 quai Lucien Lefranc, Aubervilliers, France

^c Advanced Technology Institute, University of Surrey, Guildford, Surrey, UK

^d Department of Physics, Queen Mary University of London, Mile End Road, London, UK

Abstract

The optical properties of Yb³⁺ and Er³⁺ co-doped Ln₂BaZnO₅ (Ln = Y or Gd), synthesized by solid-state reaction, are investigated in detail. Two main emission bands centered around 548 nm (green) and 673 nm (red) are observed under 977 nm laser excitation via an upconversion process. Studies of the behavior as a function of dopant concentration are described and relatively high infrared to visible upconversion efficiencies of ∼5% are obtained at room temperature. Under modulated 977 nm excitation and for fixed dopant concentrations, the upconverted emission chromaticity can be varied by changing the excitation duration. The results of power dependence studies and lifetime measurements are presented. This detailed study of the upconversion processes allows us to identify the dominant upconversion mechanisms in Yb³⁺,Er³⁺ co-doped Ln₂BaZnO₅ oxides.

This article is part of the themed collection: In celebration of Tony Cheetham’s 70th birthday

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Article information

DOI: https://doi.org/10.1039/C000127A
Article type: Paper
Submitted: 06 Jan 2010
Accepted: 19 Feb 2010
First published: 18 Mar 2010

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J. Mater. Chem., 2010,20, 3989-3994

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Oxide phosphors for efficient light upconversion: Yb³⁺ and Er³⁺ co-doped Ln₂BaZnO₅ (Ln = Y, Gd)

I. Etchart, A. Huignard, M. Bérard, M. N. Nordin, I. Hernández, R. J. Curry, W. P. Gillin and A. K. Cheetham, J. Mater. Chem., 2010, 20, 3989 DOI: 10.1039/C000127A

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Journal of Materials Chemistry