Sviluppo del metodo urea glass-route per la preparazione di nanoparticelle di Ce:YAG

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Abstract

[automatically translated] The materials based on yttrium aluminum garnet (YAG) doped with lanthanide ions have aroused in recent years considerable interest for their important technological applications in the field of optoelectronic devices such as lasers, LEDs, display and scintillators for X-rays In particular, the YAG doped with ions Ce (III) is used, in combination with semiconductors of gallium nitride (GaN) or indium and gallium (GaInN), for the realization of LED bianca1 light. The improved performance of these devices is constrained optimization, in terms of properties, of the materials that compose it. One of the strategies consists of preparing nanoparticles (np) of Ce: YAG laser with controlled size and morphology. It has been shown that the optical properties of such material are closely related to the size and morfologia2. In this context, the development of new synthetic strategies that lead to obtain np with the desired characteristics is of fundamental importance. The purpose of this work consists in the development of an inexpensive synthesis method, one-step and extensible large-scale leading to the formation of np isolated of Ce: YAG with size and controlled morphology. The np of Ce: YAG were prepared by urea glass-Route3, which proceeds through the gel complex formation between the metals and the urea and the calcination at the appropriate temperature. The synthesis was conducted at different molar ratios R of urea / metals. both the structure have been studied, the morphology and the optical properties of the particles obtained that the complex gel in order to understand the role of urea in the formation of the garnet phase. The results indicate that the formation of complex and temperature appropriate calcination are closely related to the relationship R. E 'it was also rediscounted a dependency between R and structure, size and morphology of the np. references 1 Tucureanu, V., Matei, A., & Avram, AM Opto-Electronics Review, 23 (4), (2015) 239-251. 2 Djaoued, Y., Ozga, K., Wojciechowski, A., Reshak, AH, Robichaud, J., Kityk, IV, Journal of Alloys and Compounds 508 (2010) 599. 3 Giordano, C., Erpen, C. , Yao, WT, Milke, B., Antonietti, M., Chemistry of Materials, 21 (21), (2009) 5136.
Original languageItalian
Number of pages2
Publication statusPublished - 2015

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