OBJECTIVES The deposition of high-quality luminescent thin films based on rare earth doped oxide or fluoride matrixes Y2O3, TiO2, YF3. They are of interest in two types of applications:
as light amplifier media,
as up- or down conversion layer for solar cells.
NON PERMANENT STAFF
E. Payrer (PhD student)
S. Battiatto (visiting PhD student)
LPCML, Lyon (France), Prof. B. Moine
IRCP, Paris (France), Dr. A. L. Joudrier
IST Lisbonne (Portugal), Prof. R. Almeida
Univ. of Catania (Italy), Prof. G. Malandrino
Modification of the solar spectrum by photon conversion (known as up- and down- conversion) represents an attractive alternative to increase the performance of different types of solar cells. In an original approach, we have used fluoride matrixes, as opposed to the more traditional ones based on oxides, which have shown poor absorption and transfer efficiency. We have thus been the first ones to develop the synthesis of YF3 codoped with Er and Yb by MOCVD. This has led to an increase by a factor of 100 of the mean lifetime of the green or red Erbium ion transitions, as compared to Y2O3 matrix.
Up-conversion intensity,after an excitation at 972nm,of green and red emission of Er vs Yb concentration in Yb,Er:YF3 thin films.
E.L. Payrer, R.M. Almeida, C. Jiménez, P.D. Szkutnik and J.L. Deschanvres, Growth of lanthanide-doped YF3 thin films by pulsed liquid injection MOCVD: Influence of deposition parameters on film microstructure, Surface & Coatings Technology, 2013. 230: p. 22-27(10.1016/j.surfcoat.2013.06.099).
Rached Salhi and Jean-Luc. Deschanvres “Efficient upconversion in Er3+ doped Y2O3/Si thin film deposited by aerosol UV-assisted MOCVD process” Journal of Luminescence, 170 (2016) 231-239, http://dx.doi.org/10.1016/j.jlumin.2015.10.027
R. Elleuch, R. Salhi, J.-L. Deschanvres, R. Maalej “Highly efficient NIR to visible upconversion in a ZnO:Er,Yb thin film deposited by a AACVD atmospheric pressure process” RSC ADVANCES, 74 Vol 5 (2015) Pages: 60246-60253, http://dx.doi.org/10.1039/c5ra10442d