The Effect of Size and Thermal Treatment on the Photoluminescent Properties of Europium-Doped SiO2 Nanoparticles Prepared in One Pot by Sol-Gel

Materials

Hussein Fneich¹  Ahmad Mehdi¹  Wilfried Blanc²  Nathalie Gaumer³  Stéphane Chaussedent³ 

[1] ICGM, CNRS, ENSCM, University Montpellier, 34095 Montpellier, France;INPHYNY, Université Côte d’Azur, CNRS UMR 7010, Parc Valrose, 06108 Nice, France;LPHIA, SFR MATRIX, University of Angers, 49000 Angers, France;

关键词: luminescent materials;    silica nanoparticles;    rare-earth ions;    europium;    sol-gel;    photoluminescence;   

DOI  :  10.3390/ma14071607

来源: DOAJ

【 摘 要 】

Europium (Eu)-doped silica nanoparticles have attracted great interest for different applications, in particular in biomedicine as biosensors or for tissue regeneration. Sol-gel is the most common process used to prepare those particles, with size varying from tens to hundreds of nanometers. In this article, we focus our attention on the comparison between two commonly used sol-gel derived methods: reverse microemulsion (for particles smaller than 100 nm) and Stöber method (for particles larger than 100 nm). Europium concentration was varied between 0.2 and 1 mol%, and the nanoparticle diameters were 10, 50 and 100 nm. The link between the local environment of europium ions and their optical properties was investigated and discussed. Using Transmission Electron Microscopy, nitrogen sorption, X-ray diffraction, Fourier-Transform Infra-Red and pulsed doubled Nd:YAG laser, we confirmed that fluorescence lifetime was improved by thermal treatment at 900 °C due to the elimination of aqueous environment and modification of structure disorder. The size of nanoparticles, the amount of europium and the thermal treatment of obtained materials influence the emission spectra and the decay curves of Eu³⁺.

【 授权许可】

Unknown