Electrically control amplified spontaneous emission in colloidal quantum dots

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buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage10en_US
dc.citation.issueNumber10en_US
dc.citation.spage1en_US
dc.citation.volumeNumber5en_US
dc.contributor.authorYu, J.en_US
dc.contributor.authorShendre, S.en_US
dc.contributor.authorKoh, W.en_US
dc.contributor.authorLiu, B.en_US
dc.contributor.authorLi, M.en_US
dc.contributor.authorHou, S.en_US
dc.contributor.authorHettiarachchi, C.en_US
dc.contributor.authorDelikanlı, S.en_US
dc.contributor.authorHernandez-Martinez, P.en_US
dc.contributor.authorBirowosuto, M. D.en_US
dc.contributor.authorWang, H.en_US
dc.contributor.authorSum, T.en_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.contributor.authorDang, C.en_US
dc.date.accessioned2020-02-14T08:03:19Z
dc.date.available2020-02-14T08:03:19Z
dc.date.issued2019
dc.departmentDepartment of Electrical and Electronics Engineeringen_US
dc.departmentDepartment of Physicsen_US
dc.departmentInstitute of Materials Science and Nanotechnology (UNAM)en_US
dc.description.abstractColloidal quantum dots (CQDs) are highly promising materials for light amplification thanks to their efficient photoluminescence, tunable emission wavelength and low-cost synthesis. Unfortunately, CQDs are suffering from band-edge state degeneracy which demands multiple excitons to achieve population inversion. As a result, non-radiative Auger recombination increases the lasing threshold and limits the gain lifetime. Here, benefiting from the negative charging, we demonstrate that the amplified spontaneous emission (ASE) threshold is controllable in a device where CQD film is exposed to an external electric field. Specifically, singly charged CQDs lower the threshold due to the preexisting electron in the conduction band, while strongly enhanced Auger recombination in doubly charged CQDs stymies the ASE. Experimental results and kinetic equation model show that ASE threshold reduces 10% even if our device only charges ~17% of the CQD population. Our results open new possibilities for controlling exciton recombination dynamics and achieving electrically pumped CQD lasers.en_US
dc.identifier.doi10.1126/sciadv.aav3140en_US
dc.identifier.issn2375-2548
dc.identifier.urihttp://hdl.handle.net/11693/53354
dc.language.isoEnglishen_US
dc.publisherAmerican Association for the Advancement of Scienceen_US
dc.relation.isversionofhttps://dx.doi.org/10.1126/sciadv.aav3140en_US
dc.source.titleScience Advancesen_US
dc.subjectQuantum dotsen_US
dc.subjectColloidal quantum dotsen_US
dc.subjectAuger recombinationen_US
dc.titleElectrically control amplified spontaneous emission in colloidal quantum dotsen_US
dc.typeArticleen_US
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Department of Electrical and Electronics Engineering
Department of Physics
Institute of Materials Science and Nanotechnology (UNAM)