Attractive versus repulsive excitonic interactions of colloidal quantum dots control blue-to red-shifting (and non-shifting) amplified spontaneous emission

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage4152en_US
dc.citation.issueNumber23en_US
dc.citation.spage4146en_US
dc.citation.volumeNumber4en_US
dc.contributor.authorCihan, A. F.en_US
dc.contributor.authorKelestemur, Y.en_US
dc.contributor.authorGuzelturk, B.en_US
dc.contributor.authorYerli, O.en_US
dc.contributor.authorKurum, U.en_US
dc.contributor.authorYaglioglu, H. G.en_US
dc.contributor.authorElmali, A.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.date.accessioned2015-07-28T12:01:13Z
dc.date.available2015-07-28T12:01:13Z
dc.date.issued2013-11-21en_US
dc.departmentDepartment of Physicsen_US
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractTunable, high-performance, two-photon absorption (TPA)-based amplified spontaneous emission (ASE) from near-unity quantum efficiency colloidal quantum dots (CQDs) is reported. Besides the absolute spectral tuning of ASE, the relative spectral tuning of ASE peak with respect to spontaneous emission was shown through engineering excitonic interactions in quasi-type-II CdSe/CdS core/shell CQDs. With core shell size adjustments, it was revealed that Coulombic exciton-exciton interactions can be tuned to be attractive (type-I-like) or repulsive (type-II-like) leading to red- or blue-shifted ASE peak, respectively, and that nonshifting ASE can be achieved with the right core shell combinations. The possibility of obtaining ASE at a specific wavelength from both type-I-like and type-II-like CQDs was also demonstrated. The experimental observations were supported by parametric quantum-mechanical modeling, shedding light on the type-tunability. These excitonically engineered CQD-solids exhibited TPA-based ASE threshold as low as 6.5 mJ/cm(2) under 800 nm excitation, displaying one of the highest values of TPA cross-section of 44 660 GM.en_US
dc.description.provenanceMade available in DSpace on 2015-07-28T12:01:13Z (GMT). No. of bitstreams: 1 10.1021-jz402211m.pdf: 3686575 bytes, checksum: 748ea5fd144e3baf31e740913a831021 (MD5)en
dc.identifier.doi10.1021/jz402211men_US
dc.identifier.issn1948-7185
dc.identifier.urihttp://hdl.handle.net/11693/12383
dc.language.isoEnglishen_US
dc.publisherAmerican Chemical Societyen_US
dc.relation.isversionofhttp://dx.doi.org/10.1021/jz402211men_US
dc.source.titleThe Journal of Physical Chemistry Lettersen_US
dc.subjectInverted Core/shell Nanocrystalsen_US
dc.subjectSemiconductor Nanocrystalsen_US
dc.subjectStimulated-emissionen_US
dc.subjectLight Amplificationen_US
dc.subjectOptical Gainen_US
dc.subjectWave-guidesen_US
dc.subjectConfinementen_US
dc.subjectEnergyen_US
dc.subjectDynamicsen_US
dc.subjectRegimeen_US
dc.titleAttractive versus repulsive excitonic interactions of colloidal quantum dots control blue-to red-shifting (and non-shifting) amplified spontaneous emissionen_US
dc.typeArticleen_US

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