General Scientific Meeting 2016 of the Belgian Physical Society

YAGG:Cr$^{3+}$ luminescence : influence of synthesis on luminescent properties

May 18, 2016, 2:45 PM

8h 15m

Pand

Poster Session

Speakers

Mr Jesse BOUMAN (Lumilab, Dept. Solid State Sciences, Ghent University, Ghent, Belgium)Ms Marta TIBERI (Nanomaterials and Interfaces Group (NIG), Chemistry Dept., University of Milan, Milan, Italy)Mr Olivier Q DE CLERCQ (Lumilab, Dept. Solid State Sciences, Ghent University, Ghent, Belgium)

Description

YAGG:Cr3+ luminescence : influence of synthesis on luminescent properties

J.H. Bouman 1, M.Tiberi 2, O.Q. De Clercq 1, K. Korthout1, P.F. Smet 1 and D. Poelman 1

1 Lumilab, Dept. Solid State Sciences, Ghent University, Ghent, Belgium

2 Nanomaterials and Interfaces Group (NIG), Chemistry Dept., University of Milan, Milan, Italy

Synthetic Yttrium Aluminium Garnet (Y$3Al_5O{12},YAG)hasbeenwidelystudiedasahostmaterialforlasingandw−LEDphosphorapplications.Inthiswork,wefocusonCr^{3+}−dopedYAG,whichisanear−infraredemitterandapromisingcandidateforapplicationsinmedicalimaging.ThedevelopedYAG:Cr^{3+}phosphorshowsbrightnear−infraredemission,peakingat690nmandhasahighinternalquantumefficiencyof87^{3+}byGa^{3+}inthehost,resultingintheformationofaY3Al{5-x}GaxO{12}$ (YAGG) host structure, allows for band gap tuning and modification of the luminescent behavior of the phosphor.

We performed characterization of the optical properties of the Cr3+ ion in YAGG via steady-state and time-resolved photoluminescence, cathodoluminescence and thermal quenching experiments. The influence of the preparation method is checked, as we compare the luminescent properties of YAGG:Cr3+ synthesized via solid state synthesis and wet-chemical methods such as coprecipitation. The latter allows for more rigorous control of the grain size and the distribution of Cr-dopants in the host.