Study of Perovskite Quantum Dots for Super-resolution Microscopy Applications

• Autor(a) principal: Meixeiro, Ana Carolina Espada Antunes e Natal
• Data de Publicação: 2019
• Tipo de documento: Dissertação
• Idioma: eng
• Título da fonte: Repositório Científico de Acesso Aberto de Portugal (Repositórios Cientìficos)
• Texto Completo: http://hdl.handle.net/10362/104481
• topic: Quantum Dots; Iodine Perovskite; Photophysical properties; NIR; dSTORM; Confocal; Domínio/Área Científica::Engenharia e Tecnologia::Nanotecnologia

Quantum Dots (QDs) are known for their remarkable optical properties, such as, high photoluminescent quantum yields (PLQY), large absorption spectra, narrow emission spectra, excellent photostability and the possibility to shift the fluorescence emission in a wide spectrum of colours through QD synthesis conditions [1–4]. When compared with conventional fluorophores, QDs show many advantages, like resistance to photobleaching, enhanced photostability and brightness [5]. In this work Iodine Perovskite Quantum Dots (CsP bI3) were used, since this type of QDs show great photophysical properties and nearinfrared (NIR) emission. Nevertheless, their structural stability and shelf life needed improvement, so a doping system based on cadmium was developed, and alterations in the synthesis were studied to fulfil the needs without causing any kind of drawback. An extensive optical, chemical and morphological characterisation was carried out to fully understand the influence of the developed particle engineering. It was proven that the doping system and synthesis modifications increase the stability of the nanocrystal, without pitfalls. Finally, different Super Resolution Microscopy techniques were used to investigate the performance of the PQDs, the possibility of using them as fluorescent dyes and a possible resolution enhancement.