Sub-single exciton optical gain threshold in colloidal semiconductor quantum wells with gradient alloy shelling

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buir.contributor.authorTaghipour, Nima
buir.contributor.authorDelikanlı, Savaş
buir.contributor.authorSak, Mustafa
buir.contributor.authorIşık, Furkan
buir.contributor.authorTanrıöver, İbrahim
buir.contributor.authorDemir, Hilmi Volkan
buir.contributor.orcidDemir, Hilmi Volkan|0000-0003-1793-112X
dc.citation.epage8en_US
dc.citation.issueNumber1en_US
dc.citation.spage1en_US
dc.citation.volumeNumber11en_US
dc.contributor.authorTaghipour, Nima
dc.contributor.authorDelikanlı, Savaş
dc.contributor.authorShendre, S.
dc.contributor.authorSak, Mustafa
dc.contributor.authorLi, M.
dc.contributor.authorIşık, Furkan
dc.contributor.authorTanrıöver, İbrahim
dc.contributor.authorGüzeltürk, B.
dc.contributor.authorSum, T. C.
dc.contributor.authorDemir, Hilmi Volkan
dc.date.accessioned2021-03-01T13:08:01Z
dc.date.available2021-03-01T13:08:01Z
dc.date.issued2020
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 semiconductor quantum wells have emerged as a promising material platform for use in solution-processable lasers. However, applications relying on their optical gain suffer from nonradiative Auger decay due to multi-excitonic nature of light amplification in II-VI semiconductor nanocrystals. Here, we show sub-single exciton level of optical gain threshold in specially engineered CdSe/CdS@CdZnS core/crown@gradient-alloyed shell quantum wells. This sub-single exciton ensemble-averaged gain threshold of (Ng)≈ 0.84 (per particle) resulting from impeded Auger recombination, along with a large absorption cross-section of quantum wells, enables us to observe the amplified spontaneous emission starting at an ultralow pump fluence of ~ 800 nJ cm−2, at least three-folds better than previously reported values among all colloidal nanocrystals. Finally, using these gradient shelled quantum wells, we demonstrate a vertical cavity surface-emitting laser operating at a low lasing threshold of 7.5 μJ cm−2. These results represent a significant step towards the realization of solution-processable electrically-driven colloidal lasers.en_US
dc.identifier.doi10.1038/s41467-020-17032-8en_US
dc.identifier.issn2041-1723
dc.identifier.urihttp://hdl.handle.net/11693/75684
dc.language.isoEnglishen_US
dc.publisherNature Researchen_US
dc.relation.isversionofhttps://dx.doi.org/10.1038/s41467-020-17032-8en_US
dc.source.titleNature Communicationsen_US
dc.subjectColloidal semiconductor quantum wellsen_US
dc.subjectSub-single exciton optical gain thresholden_US
dc.subjectGradient alloy shellingen_US
dc.titleSub-single exciton optical gain threshold in colloidal semiconductor quantum wells with gradient alloy shellingen_US
dc.typeArticleen_US

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Department of Electrical and Electronics Engineering
Department of Physics
Institute of Materials Science and Nanotechnology (UNAM)