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

Jackson

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.

Citation

Jackson. (2020). Site-selective laser spectroscopy and defect configurations of the Nd3+-Li+ centres in ZnO powders. Journal of Alloys and Compounds, 153306 - 153306. https://doi.org/10.1016/j.jallcom.2019.153306

• 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