6533b861fe1ef96bd12c5a5b
RESEARCH PRODUCT
Optical properties of nanocrystalline-coatedY2O3:Er3+, Yb3+ obtained by mechano-chemical and combustion synthesis.
Fernando GonzálezValérie PotinRafael ValienteC. BlancoCarmen PesqueraM.c. Marco De LucasRosa Martín-rodríguezsubject
Materials sciencePhotoluminescenceBiophysicsAnalytical chemistryMineralogyNanoparticle02 engineering and technology010402 general chemistry01 natural sciencesBiochemistryCoatingMicroscopyDopantOptical propertiesGeneral Chemistry021001 nanoscience & nanotechnologyCondensed Matter PhysicsAtomic and Molecular Physics and OpticsNanocrystalline materialPhoton upconversion0104 chemical sciencesTransmission electron microscopyEnergy transferNanoparticles0210 nano-technologyLuminescenceUpconversiondescription
International audience; Y2O3:Er3+, Yb3+ nanocrystals have been obtained by ball milling and using a combustion synthesis procedure. In both cases the nanocrystals have been successfully coated with SiO2 following the Stöber method. The average size of the as-synthesized nanoparticles has been estimated from X-ray diffraction patterns and transmission electron microscopy images. The dependence of the optical properties of these samples on synthesis procedure or dopant concentration has been investigated. Emission, excitation and lifetime measurements have been carried out. Upconversion luminescence has been detected in all samples and an enhancement of the red to green emission ratio has been observed in all samples after infrared compared to visible excitation. The mechanisms responsible for the upconversion phenomena have been discussed.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2009-09-01 |