Silica-coating of nano-Y3Al5O12:Ce3+ synthesized by self-combustion - Archive ouverte HAL Accéder directement au contenu
Article Dans Une Revue Bulletin of Materials Science Année : 2019

Silica-coating of nano-Y3Al5O12:Ce3+ synthesized by self-combustion

Résumé

Y2.91Ce0.09Al5O12 is obtained by self-combustion, grinding and sol–gel coating. X-ray diffraction, transmission electron microscopy, photoluminescence and absorption measurements were used to identify the structural and optical properties of each step of the process. The process is composed of a combination of chemical and physico-chemical processesincluding combustion and thermal steps, followed by grinding, powder dispersion by acidic passivation, stabilization of particle dispersions with citrate ligands and embedding of yttrium aluminium garnet (YAG) particles into SiO2 shells usinga seeded growth process before drying. The initial state of the obtained powder is composed of 35 nm crystallites, sintered and agglomerated. The grinding step breaks the sintered bridge, while the passivation and citrate adsorption steps separate the particles by electrostatic repulsion before the silica coating. The optical characterizations are performed and compared separately for the powdered samples that represent the initial and final states of our process, and the dispersion sample represents the intermediate state of our process. The optical measurement revealed an important amount of optical defectsat the surface of the particles, compared with micrometric commercial particles. The grinding, nitric acid and citrate steps remove some of these defects. The final state of the sample still possesses lower quantum efficiency than that of a micrometric sample, but the SiO2 coating allows for a perfect separation of the particle, suitable for implementation in small devices.

Domaines

Matériaux
Fichier principal
Vignette du fichier
2019-032.pdf (1.61 Mo) Télécharger le fichier
Origine : Fichiers éditeurs autorisés sur une archive ouverte
Loading...

Dates et versions

hal-02048749 , version 1 (25-02-2019)

Identifiants

Citer

Robin Malo, Benoit Glorieux, Stéphane Mornet, Brice Mutelet, Laurence Vignau, et al.. Silica-coating of nano-Y3Al5O12:Ce3+ synthesized by self-combustion. Bulletin of Materials Science, 2019, 42 (1), 6 (7 p.). ⟨10.1007/s12034-018-1701-4⟩. ⟨hal-02048749⟩
105 Consultations
39 Téléchargements

Altmetric

Partager

Gmail Facebook X LinkedIn More