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dc.contributor.authorDelikanli, Savasen_US
dc.contributor.authorErdem, Onuren_US
dc.contributor.authorIsik, Furkanen_US
dc.contributor.authorDehghanpour Baruj, Hameden_US
dc.contributor.authorShabani, Farzanen_US
dc.contributor.authorYagci, Huseyin Bilgeen_US
dc.contributor.authorDurmusoglu, Emek Goksuen_US
dc.contributor.authorDemir, Hilmi Volkanen_US
dc.identifier.citationDelikanli, S., Erdem, O., Isik, F., Dehghanpour Baruj, H., Shabani, F., Yagci, H. B., Durmusoglu, E. G. & Demir, H. V. (2021). Ultrahigh green and red optical gain cross sections from solutions of colloidal quantum well heterostructures. Journal of Physical Chemistry Letters, 12(9), 2177-2182.
dc.description.abstractWe demonstrate amplified spontaneous emission (ASE) in solution with ultralow thresholds of 30 μJ/cm2 in red and of 44 μJ/cm2 in green from engineered colloidal quantum well (CQW) heterostructures. For this purpose, CdSe/CdS core/crown CQWs, designed to hit the green region, and CdSe/CdS@CdxZn1–xS core/crown@gradient-alloyed shell CQWs, further tuned to reach the red region by shell alloying, were employed to achieve high-performance ASE in the visible range. The net modal gain of these CQWs reaches 530 cm–1 for the green and 201 cm–1 for the red, 2–3 orders of magnitude larger than those of colloidal quantum dots (QDs) in solution. To explain the root cause for ultrahigh gain coefficient in solution, we show for the first time that the gain cross sections of these CQWs is ≥3.3 × 10–14 cm2 in the green and ≥1.3 × 10–14 cm2 in the red, which are two orders of magnitude larger compared to those of CQDs.en_US
dc.description.sponsorshipAgency for Science, Technology and Research (A*STAR)en_US
dc.description.sponsorshipNational Research Foundation (NRF)en_US
dc.relation.ispartofJournal of Physical Chemistry Lettersen_US
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of Physical Chemistry Letters, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see
dc.titleUltrahigh green and red optical gain cross sections from solutions of colloidal quantum well heterostructuresen_US
dc.typeJournal Articleen
dc.contributor.schoolSchool of Electrical and Electronic Engineeringen_US
dc.contributor.schoolSchool of Materials Science and Engineeringen_US
dc.contributor.schoolSchool of Physical and Mathematical Sciencesen_US
dc.contributor.researchLUMINOUS! Centre of Excellence for Semiconductor Lighting & Displaysen_US
dc.description.versionAccepted versionen_US
dc.subject.keywordsQuantum Dotsen_US
dc.description.acknowledgementThe authors gratefully acknowledge the financial support in part from Singapore National Research Foundation under the programs of NRF-NRFI2016-08, NRF-CRP14-2014-03 and the Science and the Singapore Agency for Science, Technology and Research (A*STAR) SERC Pharos Program under Grant No. 152-73-00025 and in part from TUBITAK 115F297, 117E713, and 119N343. H.V.D. also gratefully acknowledges support from TUBA. O.E. acknowledges support from TUBITAK BIDEB. S.D. and O.E contributed equally. The authors declare no competing financial interest.en_US
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