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Título: | Energy transfer via exciton transport in quantum dot based self-assembled superstructures |
Autor: | Bernardo, C.; Belsley, M.; Coutinho, Paulo; Schellenberg, Peter; Moura, I.; Núñez Fernández, Yuriel; Stauber, Tobias CSIC ORCID; Vasilevskiy, Mikhail | Fecha de publicación: | 2016 | Citación: | Ciência 2016 (2016) | Resumen: | Quantum dots (QDs) of II-VI semiconductors are known for their excellent luminescent properties related to quantum-confined exciton states. A relatively recent developments is the fabrication of QD-based self-assembled polycrystallytes which aggregate to shapes ranging from nearly-1D nanowires to 2D and 3D dendrite like structures. Such structures may be employed for energy harvesting, where non-radiactive excition transport competes with exciton recombination, providing a mechanism for energy transfer in a desired direction. We fabricated dendrite-type superstructures of fractal dimension consisting of CdSe/ZnS & CdTe capped nanodots. These structures were studied using microscopic fluorescence intensity imaging as well as spectral and lifetime mapping. The analysis of these maps points to a temporal behaviour which indicates Förster type energy transfer as a result of the inter-QD dipolar coupling within the superstructure. The transfer is directed from the ends to the center of the dendrite. | Descripción: | Poster presented at encontro Ciência 2016, which took place in Academia de Ciências de Lisboa (Portugal) during 4-6th July 2016. | URI: | http://hdl.handle.net/10261/179913 |
Aparece en las colecciones: | (ICMM) Comunicaciones congresos |
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