Publication: Estudio de nanomateriales luminiscentes basados en matrices tipo zircón y nasicon
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2017-05-18
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Universidad Complutense de Madrid
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Abstract
El estudio de nanomateriales luminiscentes constituye una línea de investigación de gran interés para la comunidad científica que, a día de hoy, se encuentra en estado de desarrollo. Este interés está basado en sus interesantes propiedades ópticas y, por tanto, en su amplio potencial de aplicación. En la actualidad, algunos científicos trabajan en la búsqueda de materiales luminiscentes que puedan ofrecer mejores prestaciones. Entre estos beneficios se pueden citar: la posibilidad de generar diferentes emisiones luminiscentes en todo el rango del espectro visible o el deseo de introducir una gran mejora en la eficiencia energética del dispositivo en el que se inserten. En materiales basados en matrices anfitrión, un incremento de la eficiencia energética se logra por medio de la energía transferida de forma eficaz desde la matriz anfitrión a los iones activadores que están contenidos dentro de esa matriz. Las estructuras tipo zircón y NASICON reúnen las características idóneas (buenas propiedades mecánicas y alta estabilidad química) para ejercer como redes anfitrión de ciertos iones luminiscentes. El ortovanadato de itrio de fórmula YVO4 de estructura tipo zircón se ha estudiado ampliamente como matriz láser de estado sólido. Su estructura, constituida por cadenas de bisdisfenoides [YO8] que comparten aristas y que se conectan mediante tetraedros [VO4] aislados, ofrece la posibilidad de albergar en su interior iones activadores de la luminiscencia. Desde hace años se viene investigando en compuestos sintetizados dentro del sistema Ln3+:YVO4, con Ln = iones lantánidos, donde se ha observado que la morfología de las muestras obtenidas influye en la intensidad de las emisiones luminiscentes...
The study of luminescent nanomaterials is an issue of great interest to the scientific community that, at present, is in a state of development. This interest is based on the interesting optical properties and therefore, in its extensive application potential. Currently, some scientists are working on finding luminescent materials that can offer better performance. These benefits may include: the ability to generate different luminescent emissions across the range of the visible spectrum or the desire to introduce a great improvement in energy efficiency of the device in which it is inserted. In materials based on host networks, an increase in energy efficiency is achieved through the energy transferred efficiently from the host matrix to the activator ions. The zircon and NASICON structures meet the ideal characteristics (good mechanical properties and high chemical stability) to act as host networks of certain luminescent ions. Yttrium orthovanadate YVO4 with zircon-type structure has been widely studied as solid state laser array. Its structure, consisting of chains of bidisphenoids [YO8] sharing edges which are connected by isolated tetrahedra [VO4], provides the possibility of trapping ion activators of luminescence. In samples synthesized in the Ln3+:YVO4 system with Ln = lanthanide ions, it has been observed that particle shape and size affects the intensity of the luminescent emissions...
The study of luminescent nanomaterials is an issue of great interest to the scientific community that, at present, is in a state of development. This interest is based on the interesting optical properties and therefore, in its extensive application potential. Currently, some scientists are working on finding luminescent materials that can offer better performance. These benefits may include: the ability to generate different luminescent emissions across the range of the visible spectrum or the desire to introduce a great improvement in energy efficiency of the device in which it is inserted. In materials based on host networks, an increase in energy efficiency is achieved through the energy transferred efficiently from the host matrix to the activator ions. The zircon and NASICON structures meet the ideal characteristics (good mechanical properties and high chemical stability) to act as host networks of certain luminescent ions. Yttrium orthovanadate YVO4 with zircon-type structure has been widely studied as solid state laser array. Its structure, consisting of chains of bidisphenoids [YO8] sharing edges which are connected by isolated tetrahedra [VO4], provides the possibility of trapping ion activators of luminescence. In samples synthesized in the Ln3+:YVO4 system with Ln = lanthanide ions, it has been observed that particle shape and size affects the intensity of the luminescent emissions...
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Tesis inédita de la Universidad Complutense de Madrid, Facultad de Ciencias Químicas, Departamento de Química Inorgánica I, leída el 22-04-2016