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Title: Organic materials for photonics : properties and applications
Author: Carnicella, Giuseppe
ISNI:       0000 0004 8508 2120
Awarding Body: UCL (University College London)
Current Institution: University College London (University of London)
Date of Award: 2019
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Photonics will play a key-role for the future development of ICT and healthcare and organic semiconductors are promising candidates to fulfil the capacity of photonics and deliver on its promises. This "photonics revolution" relies on novel and more performing materials, tailored for the specific requirements of real-world applications, and on reliable and cheap technologies, which can attract investments to address the transition from academia to industry. In this dissertation, I will report my findings on conjugated polymers suitable for photonic applications and demonstrate their use into low-cost photonic structures, as proof of concept. The first part is dedicated to the study of an aggregation-induced emission polymer, whose fluorescence is enhanced in the aggregated solid-state thanks to the restrictions of intramolecular rotations in contrast to typical planar conjugated polymers. I will show its exceptional fundamental photophysical properties which enable the reduction of non-radiative pathways and makes it attractive for its use in organic light-emitting diodes. In the second part, I will present the application of conjugated polymers into flexible all-polymer microcavities fabricated through a low-cost process based on spin coating. The incorporation of functional defects in periodic dielectric structures with optical feedback will enable the change in the photonic density of states. I will report the investigation on photonic resonators embedding an aggregation-induced polymer emitting in the visible and a novel near-infrared oligomer, assessing high quality factors and tuning of their radiative rates to achieve low threshold optically pumped lasers. In the last part, I will show the infiltration of conjugated engineered materials into porous silicon microcavities to enable a novel class of photonically-enhanced chips for communications and sensing. A cheap electrochemical technique has been employed to fabricate one-dimensional resonators, which I characterized fully to demonstrate the variation of the photonic density of states and an efficient approach to novel hybrid photonic devices.
Supervisor: Cacialli, F. Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID:  DOI: Not available