Site-selective laser spectroscopy and defect configurations of the Nd3+-Li+ centres in ZnO powders

Jackson

doi:10.1016/j.jallcom.2019.153306

Site-selective laser spectroscopy and defect configurations of the Nd3+-Li+ centres in ZnO powders

Jackson

Authors

Robert Jackson r.a.jackson@keele.ac.uk

Abstract

Near-infrared emission in the 885–915?nm region was observed for two distinct Nd3+ centres that co-exist in hexagonal wurtzite ZnO:1?mol%Nd3+:10?mol%Li+ powders. The powder samples were prepared by sintering in air at 950?°C and the emission, attributed to the 4F3/2???4I9/2 transitions of Nd3+ ions, was measured in the 10–75?K temperature range. The sharp and well-resolved Nd3+ emission transitions are present in Nd3+-Li+ co-doped samples only, and the intensity increases with Li+ concentration. X-ray diffraction, scanning electron microscopy and energy dispersive spectroscopy were used for structural, morphology and compositional assessments of the samples. Atomistic modelling using GULP shows two favourable Nd3+-Li+ substitutional positions, in consistence with the experimental findings.

Acceptance Date	Dec 5, 2019
Publication Date	Mar 1, 2020
Journal	Journal of Alloys and Compounds
Print ISSN	0925-8388
Publisher	Elsevier
Pages	153306 - 153306
DOI	https://doi.org/10.1016/j.jallcom.2019.153306
Keywords	Site-selective spectroscopy; Nd3+-Li+; ZnO powders; Modelling; Defect configurations; Crystal-field levels
Publisher URL	https://doi.org/10.1016/j.jallcom.2019.153306