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Article Dans Une Revue RSC Advances Année : 2018

A new solvothermal method for the synthesis of size-controlled YAG:Ce single-nanocrystals

Résumé

Ce 3+-doped Y 3 Al 5 O 12 (YAG:Ce) nanocrystals were synthesized by a unique solvothermal method, under sub-critical conditions. A home-made autoclave was used, operating in a larger pressure and temperature range than that with conventional commercial equipment and allowing direct in situ photoluminescence (PL) and X-ray absorption characterizations. The study of various synthesis conditions (pressure, temperature, precursor concentration, reaction time) allowed the best reaction conditions to be pinpointed to control YAG:Ce nanocrystal size, as well as crystal quality, and to get efficient optical properties. Without any post thermal treatment, we succeeded in obtaining well-crystallized YAG:Ce nanocrystals (30-200 nm), displaying typical PL properties of YAG:Ce with a maximal emission at 550 nm. The pristine 100 nm-sized YAG:Ce nanoparticles present an internal quantum yield of about 40 AE 5%. In situ X-ray absorption near edge spectroscopy demonstrates the presence of Ce 4+ in nanocrystals elaborated at high temperature, resulting from the oxidation of Ce 3+ during the crystallization process.

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Chimie
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Dates et versions

hal-01971891 , version 1 (07-01-2019)

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Géraldine Dantelle, Denis Testemale, Estelle Homeyer, Alexandra Cantarano, Stéphanie Kodjikian, et al.. A new solvothermal method for the synthesis of size-controlled YAG:Ce single-nanocrystals. RSC Advances, 2018, 8 (47), pp.26857-26870. ⟨10.1039/c8ra05914d⟩. ⟨hal-01971891⟩
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