Lanthanide-based dielectric nanoparticles for upconversion luminescence
Nowadays special attention has been given to materials capable of generating visible light by conversion of near infrared photons (upconversion) for save-energy technologies and reduction of photodegradation caused by UV high energy photons. Nanoparticles using optically active trivalent lanthanide...
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| Tipo de recurso: | tesis doctoral |
| Fecha de publicación: | 2013 |
| País: | España |
| Institución: | Consejo Superior de Investigaciones Científicas (CSIC) |
| Repositorio: | DIGITAL.CSIC. Repositorio Institucional del CSIC |
| OAI Identifier: | oai:digital.csic.es:10261/67198 |
| Acceso en línea: | http://hdl.handle.net/10261/67198 |
| Access Level: | acceso abierto |
| Palabra clave: | Nanoparticles Upconversion |
| Sumario: | Nowadays special attention has been given to materials capable of generating visible light by conversion of near infrared photons (upconversion) for save-energy technologies and reduction of photodegradation caused by UV high energy photons. Nanoparticles using optically active trivalent lanthanide ions (Ln3+) have shown great potential for use as upconverting luminescent materials in bio-analysis applications, improvement of solar cells efficiency, fight of counterfeit in printed documents and back-lighting in liquid crystal displays. However materials with nanometer dimensions may affect the luminescence dynamics of the Ln3+ ion modifying the emission lifetime, quantum yield, and concentration quenching. This thesis discusses the synthesis and upconversion emission of Ln3+-doped nanostructures with Lu2O3 and KLu(WO4)2 as hosts because they possess high chemical stability and they offer favorable incorporation of Ln3+ ions and high absorption and emission cross sections. Three kinds of nanostructures are discussed: nanocrystals, nanorods and core-shell particles. Er3+, Ho3+ and Tm3+ are used as emitting ions and Yb3+ as sensitizer. Luminescence dynamics of these ions into the above nanostructures, and the generation of white light emission in KLu(WO4)2 nanocrystals are discussed. |
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