1. Importance of the Hierarchical Core@Multishell Nanostructure in Obtaining White Light Emission in Ln(III)-Doped ZrO2 Nanoparticles
- Author
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Italo Odone Mazali, Cristine Santos de Oliveira, Jefferson Bettini, and Fernando Aparecido Sigoli
- Subjects
Nanostructure ,Materials science ,Photoluminescence ,business.industry ,Doping ,Analytical chemistry ,Nanoparticle ,02 engineering and technology ,General Chemistry ,010402 general chemistry ,021001 nanoscience & nanotechnology ,Condensed Matter Physics ,01 natural sciences ,Emission intensity ,0104 chemical sciences ,Ion ,Optoelectronics ,General Materials Science ,Emission spectrum ,0210 nano-technology ,business ,Excitation - Abstract
The design of the hierarchically tailored 4.4 nm nanoparticles was based on the alternation between un-doped and Ln(III)-doped layers (Ln(III) = Eu(III), Tb(III)), ensuring the isolation of different Ln(III) ions in order to prevent energy transfers between them, which may lead to long term loss of quality of the emission due to one-sided cascading of the excitation energy to a single emitter. Photoluminescence emission and excitation spectra have shown the importance of this design in obtaining white light: for the alternating layer design there are no energy transfer between Tb(III) and Eu(III) ions, and emission spectra with exc = 260 nm of Tb(III),Eu(III)-codoped ZrO2 nanoparticles over a ZnO-coated silica host show a combination of Tb(III) green, Eu(III) red, and silica defects blue emissions resulting in pure white emission, and warm white with an additional Eu(III)-doped layer. While the ZnO coating layer was vital in improving Eu(III) emission intensity by suppresion of SiO2 surface (-OH) oscilla...
- Published
- 2017