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Vladimir Bulović. Cao, Yumeng Melody Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science. Massachusetts Institute of Technology. Department of Electrical Engineering and Computer Science 2018-09-17T15:55:47Z 2018-09-17T15:55:47Z 2018 2018 http://hdl.handle.net/1721.1/118061 1051460484 Thesis: S.M., Massachusetts Institute of Technology, Department of Electrical Engineering and Computer Science, 2018. Cataloged from PDF version of thesis. Includes bibliographical references (pages 67-69). Organic molecules are becoming a commonly used material in strongly coupled systems as they possess large exciton binding energies and huge oscillator strengths that have allowed for the creation of room temperature polariton condensates, superfluids, and other exotic phenomena. Using J-aggregates, the aggregated form of cyanine organic dyes, we have previously fabricated light-emitting devices that demonstrated the first ever electrically pumped polariton emission, as well as critically coupled resonators with record high effective absorption constants. Although there are many promising applications for organic exciton-polariton devices, state-of-the- art devices suffer from rapid photodegradation at higher photon densities, which presently limits their eventual implementation into a viable technology. To achieve stable devices, we need to isolate the causes of photodegradation. Specifically, we studied the photoluminescence stability of J-aggregate thin films under different atmospheric conditions. Our results indicated that J-aggregates maintain both better emission and stability in high humidity environments in comparison to oxygen-rich atmospheres. Furthermore, we show an order of magnitude improvement in the photostability via encapsulation of the film with a hygroscopic sugar encapsulant. These results are highly promising and suggest future pathways for the realization of functional and stable polariton-based devices which we will explore in this thesis. by Yumeng Melody Cao. S.M. 69 pages eng Massachusetts Institute of Technology MIT theses are protected by copyright. They may be viewed, downloaded, or printed from this source but further reproduction or distribution in any format is prohibited without written permission. http://dspace.mit.edu/handle/1721.1/7582 Electrical Engineering and Computer Science. Photostabilization of J-aggregate cyanine dyes for exciton-polariton based devices Thesis application/pdf Publication unknown unknown <Publication xmlns="https://www.openaire.eu/cerif-profile/1.1/" id="9e21ee81-4f82-4bde-9918-9ed16d503a39"> <Type xmlns="https://www.openaire.eu/cerif-profile/vocab/COAR_Publication_Types">http://purl.org/coar/resource_type/c_1843</Type> <Language>eng</Language> <Title>Photostabilization of J-aggregate cyanine dyes for exciton-polariton based devices</Title> <PublishedIn> <Publication> </Publication> </PublishedIn> <PublicationDate>2018</PublicationDate> <Authors> <Author> <DisplayName>Cao, Yumeng Melody</DisplayName> <Affiliation> <OrgUnit> </OrgUnit> </Affiliation> </Author> </Authors> <Editors> </Editors> <Publishers> <Publisher> <DisplayName>Massachusetts Institute of Technology</DisplayName> <OrgUnit /> </Publisher> </Publishers> <License>http://dspace.mit.edu/handle/1721.1/7582</License> <Keyword>Electrical Engineering and Computer Science.</Keyword> <Abstract>Organic molecules are becoming a commonly used material in strongly coupled systems as they possess large exciton binding energies and huge oscillator strengths that have allowed for the creation of room temperature polariton condensates, superfluids, and other exotic phenomena. Using J-aggregates, the aggregated form of cyanine organic dyes, we have previously fabricated light-emitting devices that demonstrated the first ever electrically pumped polariton emission, as well as critically coupled resonators with record high effective absorption constants. Although there are many promising applications for organic exciton-polariton devices, state-of-the- art devices suffer from rapid photodegradation at higher photon densities, which presently limits their eventual implementation into a viable technology. To achieve stable devices, we need to isolate the causes of photodegradation. Specifically, we studied the photoluminescence stability of J-aggregate thin films under different atmospheric conditions. Our results indicated that J-aggregates maintain both better emission and stability in high humidity environments in comparison to oxygen-rich atmospheres. Furthermore, we show an order of magnitude improvement in the photostability via encapsulation of the film with a hygroscopic sugar encapsulant. These results are highly promising and suggest future pathways for the realization of functional and stable polariton-based devices which we will explore in this thesis.</Abstract> <Access xmlns="http://purl.org/coar/access_right" > </Access> </Publication>