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Photoactive Semiconductor Nanocrystal Quantum Dots
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Article 1: Interfacing Luminescent Quantum Dots with Functional Molecules for Optical Sensing Applications
by Serena Silvi, Massimo Baroncini, Marcello La Rosa, Alberto Credi
Semiconductor quantum dots possess unique size-dependent electronic properties and are of high potential interest for the construction of functional nanodevices. Photoinduced electron- and energy-transfer processes between quantum dots and surface-bound molecular species open up attractive routes to implement chemical switching of luminescence, which is at the basis of luminescence sensing. In this article, we discuss the general principles underlying the rational design of this kind of multicomponent species. Successively, we illustrate a few prominent examples, taken from the recent literature, of luminescent chemosensors constructed by attaching molecular species to the surface of quantum dots.
by Liang Su, Xiaoyu Zhang, Yu Zhang, Andrey L. Rogach
Colloidal semiconductor quantum dots (QDs) have been widely employed as components of white light-emitting diodes (WLEDs) due to their excellent optical properties (highly saturated emission color, high luminescence quantum yield) as well as thermal and chemical stability. Much effort has been devoted to realize efficient QD-based WLEDs, including the synthesis of superior luminescent nanomaterials with excellent stabilities, and the design of advanced devices structures. In this paper, after introducing photometric parameters of the contemporary QD-based WLEDs, we highlight the recent progress in these devices grouped according to three main mechanisms for white light generation: optical excitation, direct charge carrier injection, and Förster resonance energy transfer. The methods to generate white light, the design of QD emitters and QD-based devices, as well as their fabrication techniques are considered, and the key scientific and technological challenges in the QD-based WLEDs are highlighted. Novel light-emitting materials for WLEDs such as carbon-based nanoparticles are also considered.
Alberto Credi is Professor of Chemistry at the Università di Bologna and Associate Research Director at the National Research Council, working in the areas of supramolecular chemistry and photochemistry, materials science and nanoscience. His interests are focused on the development of molecular systems and materials controlled by light; in particular, his contribution to the realization of logic devices, machines and motors of nanometer size is internationally recognized. He is involved in several research projects and he collaborates with laboratories and institutes in Italy and abroad. He has authored books and over 260 scientific publications (h-index = 62), he received several prestigious awards, including an ERC Advanced Grant, and he has been invited to speak at more than 100 national and international conferences. Since the beginning of his career he is engaged in the popularization of chemistry disciplines and scientific culture in general.