Effect of heat treatment temperature on the morphology and upconversion properties of LaF3:Yb,Er nanoparticles

Author:

Tegze Borbála,Tolnai Gyula,Hessz Dóra,Kubinyi Miklós,Madarász János,Sáfrán György,Hórvölgyi ZoltánORCID

Abstract

AbstractLaF3:5%Yb3+,0.5%Er3+ upconverting nanoparticles were synthesized with co-precipitation method and heat treated at temperatures 300–600 °C. The morphology of the particles was characterized by high-resolution transmission electron microscopy coupled with energy-dispersive spectrometry and dynamic light scattering. Crystal structure was studied by X-ray diffraction (XRD), and thermal behaviour was investigated by simultaneous thermogravimetry and differential thermal analysis (TG/DTA). Upconversion behaviour was studied in detail by fluorescence spectroscopy, with 980 nm excitation. Particle sizes increased with increasing heat treatment temperature, and samples showed significant aggregation above 500 °C. Hexagonal LaF3 crystal structure was identified for all samples, with increased crystallinity after heat treatment at 400 °C, which was corroborated with TG/DTA results. XRD and energy-dispersive spectrometry results revealed that at higher temperatures new crystal phases formed, as some Yb3+ and Er3+ dopant ions segregated into new nanocrystals, made of, for example, YbOF and YbOOH, which caused a significant decrease in the upconversion emission of the samples. The highest upconversion emission was achieved after heat treatment at 400 °C.

Funder

Nemzeti Kutatási Fejlesztési és Innovációs Hivatal

Ministry of Culture and Innovation

Budapest University of Technology and Economics

Publisher

Springer Science and Business Media LLC

Subject

Physical and Theoretical Chemistry,Condensed Matter Physics,Polymers and Plastics,Materials Chemistry

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