Novel synthetic approach to YbPO₄:Eu³⁺ and luminescence of light-emitting YbPO₄: Eu³⁺@SiO₂ hybrid nanostructure

17^th International Conference on Emerging Materials and Nanotechnolgy

March 07-08, 2019 | Berlin, Germany

Tamara Gavrilovic, Ivita Bite, Jurgis Grube, Katrina Laganovska, Krisjanis Smits, Dragana Jovanovic and Miroslav Dramicanin

Institute of Solid State Physics - University of Latvia, Latvia
Vinca Institute of Nuclear Sciences - University of Belgrade, Serbia

Posters & Accepted Abstracts: J Material Sci Eng

Abstract :

YbPO₄:Eu³⁺ and YbPO₄:Eu³⁺ @SiO₂ are developed to investigate Yb3+ sensitized up-/down-conversion luminescence of Eu3+ ions. New tetragonal light-emitting photonic materials YbPO4:Eu3+ were synthesized for the first time via sol-gel route. Optical properties of as obtained YbPO₄:Eu³⁺ and YbPO₄:Eu³⁺ :Eu3+@SiO₂ hybrid nanomaterials were investigated by varying the dopant concentration. The structural examination of YbPO₄revealed single phase tetragonal, I41/amd, zircon type structure. XRD data showed uniform morphology and extremely high crystallinity of all synthesized samples with an average particle size around 21.5 nm. Emission spectra showed intense typical transitions of Eu3+ ions. Emission spectra recorded under 320 nm; excitation demonstrated dominant 5D0â??7F1, 5D0â??7F2, 5D0â??7F4 Eu3+ transitions, which indicate that Eu3+ is not at a site with a center of symmetry. With increasing of Eu3+ doping concentration emission intensity increased. Emission spectra recorded less than 978 nm; excitation exhibited an increase of dominant emissions with doping concentration and possibility of color tuning. These insights are highly important in emerging applications of YbPO₄:Eu3+ doped nanocrystals. All emission spectra displayed high energy transitions in the 450-570 nm region characteristic of Eu3+ ions which are rarely observed. This unusual result shows that the phonon energies are low enough to lead to the observation of high energy lines in this region, which are comparable with fluoride, germanate and tellurite glasses. The influence of SiO₂ shell on up-/down-conversion emission ofYbPO₄:Eu3+ showed significant suppression of the UC/DC emission with SiO₂ protection due to light-scattering effect caused by the amorphous silica layer. The presence of free silanol groups on the surface not only results in high solubility in water, but also allows further conjugation with various biomolecules, which opens the possibility of distinct bio-applications. We obtained novel up-/down shifting material which, among distinct applications should enhance the rational design of rare-earth spectral converters.

Recent Publication

1. T V Gavrilovic, D J Jovanovic, V Lojpur and M D Dramicanin (2014) Multifuctional Eu3+ and Er3+/Yb3+-doped GdVO4 nanoparticles synthesized by reverse micelle method. Scientific Reports 4:4209-4217.

2. Tamara V Gavrilovic, Dragana J Jovanovic, Krisjanis Smits and Miroslav D Dramicanin (2016) Multicolor upconversion luminescence of GdVO4:Ln3+/Yb3+ (Ln3+ = Ho3+, Er3+, Tm3+, Ho3+/Er3+/Tm3+) nanorods. Dyes and Pigments 126:1â??7.

3. Tamara Gavrilovic, Jovana Perisa, Jelena Papa, Katarina Vukovic, Krisjanis Smits, Dragana J Jovanovic and Miroslav D Dramicanin (2018) Particle size effects on the structure and emission of Eu3+:LaPO4 and EuPO4 phosphors. Journal of Luminescence 195:420â??429.

4. Tamara V Gavrilovic, Dragana J Jovanovic, Lidija V Trandafilovc and Miroslav D Dramicanin (2015) Effects of Ho3+ and Yb3+ doping concentrations and Li+ co-doping on the luminescence of GdVO4 powders. Optical Materials 45:76â??81.

5. Tamara Gavrilovic, KatrÄ«na Laganovska, Aleksejs Zolotarjovs, Krisjanis Smits, Dragana J Jovanovic and Miroslav D Dramicanin (2018) High resolution luminescence spectroscopy and thermoluminescence of different size LaPO4:Eu3+ nanoparticles. Optical Materials 82:39â??46

Biography :

Tamara Gavrilovic has completed her PhD from Belgrade University, Serbia. She is the Lead Researcher of the Department of Institute of Solid State Physics, University of Latvia, a premier research organization. She has published more than 10 papers in reputed journals, book chapter and has been serving as an outstanding review member. She is the winner of Individual Marie Sklodowska-Curie postdoc fellowship. She has an expertise in synthetic chemistry of innovative optical materials, examination and enhancement of their properties.

E-mail: tashichica@gmail.com