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Projeto de investigação
Decorative Applications for Self-Organized Molecular Electrochromic Systems
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Screen printing and in situ electropolymerization as a simple manufacturing method to produce long cycling lifetime electrochromic indicators
Publication . Leite, Fábio A.S.; Howard, Elin L.; Pinheiro, Carlos; Parola, A. Jorge; Maggini, Laura; Laia, Cesar; DQ - Departamento de Química; LAQV@REQUIMTE; IOP Publishing
Successful commercialization of electrochromic technologies into smart labels necessitates that they can be produced in high-volumes and at a low cost. Herein we present a simple method to produce poly(3,4-ethylenedioxythiophene) electrochromic indicators via screen printing and charge controlled in situ electropolymerization. This method reduces the number of printed layers, thus lowering the overall time and cost of production. The optical contrast and visual homogeneity of the indicators can be tuned by modifying the electropolymerization voltage and limiting the charge. Due to the opaque nature of the printed electrolyte, the switching speed can be increased, and the operating voltage can be lowered by electropolymerizing an electrochromic film onto the counter electrode to act as a charge storage material. The best performing indicators exhibit a contrast of 31.1%R (600 nm), with a 1 s switching speed. The CIELAB color co-ordinates of the indicators were measured over 100 k cycles. During this period, the indicators showed an overall increase in contrast. The long cycling lifetime of the indicators makes them promising candidates for applications where frequent switching is required.
Study of Perovskite Quantum Dots for Super-resolution Microscopy Applications
Publication . Meixeiro, Ana Carolina Espada Antunes e Natal; Laia, César; Pereira, Luís
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.
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Entidade financiadora
European Commission
Programa de financiamento
H2020
Número da atribuição
760973