Effect of the Ce3+ concentration on laser-sintered YAG ceramics for white LEDs applications

This paper describes the laser sintering and luminescence properties of Y3Al5O12 (YAG) phosphors doped with different concentrations of Ce3+ and synthesized using the polymeric precursor method. The ceramics were sintered by a new laser sintering technique in which a CO2 laser is employed as the hea...

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Bibliographic Details
Published in:Journal of the European Ceramic Society 2020-08, Vol.40 (10), p.3673-3678
Main Authors: Santos, J.C.A., Silva, E.P., Sampaio, D.V., Silva, D.C., Souza, N.R.S., Kucera, C., Ballato, J., Silva, R.S.
Format: Article
Language:English
Subjects:
Ceramics
Laser sintering
LED
Photoluminescence
YAG
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Summary:This paper describes the laser sintering and luminescence properties of Y3Al5O12 (YAG) phosphors doped with different concentrations of Ce3+ and synthesized using the polymeric precursor method. The ceramics were sintered by a new laser sintering technique in which a CO2 laser is employed as the heating source. The resultant ceramics exhibited a homogeneous microstructure with narrow grain size distribution and high relative density. The introduction of Ce3+ ions led to luminescence quenching at a concentration above 0.5 mol% and a redshift of the emission spectrum band with increasing cerium concentration. The excitation spectrum showed two characteristic bands centered at 340 nm and 460 nm and a relative change in their intensity by change the Ce3+ concentration. The presence of a single valence (Ce3+) of cerium was determined by X-ray absorption near edge structure measurements.
ISSN:0955-2219
1873-619X
DOI:10.1016/j.jeurceramsoc.2020.03.069