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dc.contributor.authorGuzelturk, B.en_US
dc.contributor.authorKanibolotsky, A.L.en_US
dc.contributor.authorOrofino-Pena, C.en_US
dc.contributor.authorLaurand, N.en_US
dc.contributor.authorDawson, M.D.en_US
dc.contributor.authorSkabara P.J.en_US
dc.contributor.authorDemir, H. V.en_US
dc.date.accessioned2016-02-08T10:19:24Z
dc.date.available2016-02-08T10:19:24Z
dc.date.issued2015en_US
dc.identifier.issn20507534
dc.identifier.urihttp://hdl.handle.net/11693/23802
dc.description.abstractNonlinear optical response in organic semiconductors has been an attractive property for many practical applications. For frequency up-converted lasers, to date, conjugated polymers, fluorescent dyes and small organic molecules have been proposed but their performances have been severely limited due to the difficulty in simultaneously achieving strong nonlinear optical response and high performance optical gain. In this work, we show that structurally designed truxene-based star-shaped oligofluorenes exhibit strong structure-property relationships enabling enhanced nonlinear optical response with favorable optical gain performance. As the number of fluorene repeat units in each arm is increased from 3 to 6, these molecules demonstrate a two-photon absorption cross-section as high as 2200 GM, which is comparable to that of linear conjugated polymers. Tailored truxene oligomers with six fluorene units in each arm (T6) show two-photon absorption pumped amplified spontaneous emission with a threshold as low as 2.43 mJ cm-2, which is better than that of the lowest reported threshold in organic semiconductors. Furthermore, we show a frequency up-converted laser using the newly designed and synthesized star-shaped oligomer T6 with a threshold as low as 3.1 mJ cm-2, which is more than an order of magnitude lower than that of any conjugated polymer. Thus, these oligomers with enhanced nonlinear optical properties are highly attractive for bio-integrated applications such as photodynamic therapy and in vivo bio-sensing. © The Royal Society of Chemistry 2015.en_US
dc.language.isoEnglishen_US
dc.source.titleJournal of Materials Chemistry Cen_US
dc.relation.isversionofhttp://dx.doi.org/10.1039/c5tc02247aen_US
dc.subjectConjugated polymersen_US
dc.subjectMoleculesen_US
dc.subjectOligomersen_US
dc.subjectOptical gainen_US
dc.subjectOptical propertiesen_US
dc.subjectOrganic lasersen_US
dc.subjectOrganic polymersen_US
dc.subjectPhotodynamic therapyen_US
dc.subjectPhotonsen_US
dc.subjectSemiconductor lasersen_US
dc.subjectStarsen_US
dc.subjectTwo photon processesen_US
dc.subjectAmplified spontaneous emissionsen_US
dc.subjectIntegrated applicationsen_US
dc.subjectNon-linear optical propertiesen_US
dc.subjectNonlinear absorptionsen_US
dc.subjectNonlinear optical responseen_US
dc.subjectSmall organic moleculesen_US
dc.subjectStructure property relationshipsen_US
dc.subjectTwo-photon absorption cross sectionen_US
dc.subjectNonlinear opticsen_US
dc.titleUltralow-threshold up-converted lasing in oligofluorenes with tailored strong nonlinear absorptionen_US
dc.typeArticleen_US
dc.departmentDepartment of Electrical and Electronics Engineering
dc.citation.spage12018en_US
dc.citation.epage12025en_US
dc.citation.volumeNumber3en_US
dc.citation.issueNumber46en_US
dc.identifier.doi10.1039/c5tc02247aen_US
dc.publisherRoyal Society of Chemistryen_US


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