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This subproject aims to conduct experimental studies on crystalline nanoparticles based on perovskites (oxides and fluorides) doped with luminescent rare-earth ions (TR3+) and transition metals (MT). Their structural, vibrational, and optical properties will be analyzed under ambient and extreme pressure (P) and temperature (T) conditions. All these measurements are available in our laboratory. Due to their multiple properties, perovskite nanoparticles have applications in diverse technological fields, such as those related to photovoltaic solar energy, gas sensors, and the development of luminescent materials for use in active media for lasers, infrared-to-visible converters, optical amplifiers, or in biomedicine for in vivo or in vitro imaging applications. Nanocrystals are characterized by possessing unique properties not found in their bulk analogs. From a luminescence perspective, the quantum efficiency of these materials in the study range—UV-Vis-NIR—is a decisive factor for their potential applicability. This parameter depends on many factors, such as composition, nanocrystal size, location and distribution of dopant ions, matrix defects, etc. Therefore, a rigorous study is required that encompasses not only optical properties but also structural properties, as measured by X-ray diffraction (XRD), and vibrational properties, as measured by Raman and infrared spectroscopy (Raman and FTIR). High-pressure techniques, applied to luminescence, XRD, and Raman techniques, allow for the continuous modulation of luminescent, structural, and vibrational properties, respectively, thus providing a greater understanding of the correlation between structure and luminescent properties. The work plan can be described in the following points:
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This project is based on experimental studies on crystalline perovskite-based nanoparticles (oxides and fluorides) doped with luminescent rare earth ions (TR3+) and transition metals (MT). Its structural, vibrational and optical properties will be analyzed under ambient and extreme conditions of pressure (P) and temperature (T). All these measures are available in our laboratory. Because of their many properties, nanoparticles perovskites are used in a wide range of technological fields, such as those related to solar photovoltaic energy, gas sensors or in the development of luminescent materials used in active media for lasers, infrared to visible upconverters, optical amplifiers or in biomedicine for application in images ""in vivo"" or ""in vitro"". Nanocrystals are characterized by unique properties which are not found in their bulk counterparts. From the viewpoint of the luminescence, quantum efficiency in the optical interval, ie the UV-Vis-NIR, it is a decisive factor for their possible applicability. This parameter depends on many factors such as composition, size of the nanocrystals, location and distribution of dopant ions, defects in the matrix, etc. therefore requires a rigorous study covering not only the optical properties but also the structural properties by X-ray diffraction (XRD) and vibrational Raman spectroscopy measures and infrared (FTIR and Raman). The high pressure technique, applied both luminescence techniques, XRD and Raman allow to continuously tune both luminescent properties as the structural and vibrational respectively, thus obtaining a further understanding into the correlation between structure and luminescences properties. The work plan can be described in the following points:
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