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Photoluminescence from quasi-type-II spherical CdSe-CdS core-shell quantum dots
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
KTH, School of Information and Communication Technology (ICT), Material Physics, Functional Materials, FNM.
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
KTH, School of Information and Communication Technology (ICT), Optics and Photonics, Optics.
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2013 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 52, no 1, 105-109 p.Article in journal (Refereed) Published
Abstract [en]

Spherical CdSe-CdS core-shell quantum dots (QDs) are found to be flexible in the transition between the type-I regime and the type-II regime with different core/shell dimensions. The quasi-type-II feature of the colloidal dots is confirmed with time-resolved photoluminescence (PL) measurements. Two recombination paths of the excitons with significantly different decay rates are observed and analyzed. The spherical CdSe-CdS core-shell QDs are numerically simulated to investigate the carrier separation. A relatively long radiative lifetime and high degree of spatial carrier separation provide good potential to achieve lasing under continuous-wave excitation. Amplified spontaneous emission at room temperature is detected from the QDs embedded in the polymer matrix. It is shown that a larger shell thickness results in a lower pumping threshold, while a smaller shell thickness leads to higher PL efficiency.

Place, publisher, year, edition, pages
2013. Vol. 52, no 1, 105-109 p.
Keyword [en]
Amplified spontaneous emissions, Carrier separation, Colloidal dots, Continuous waves, Core-shell quantum dots, Core/shell, Decay rate, PL efficiency, Pumping threshold, Radiative lifetime, Room temperature, Shell thickness, Time-resolved photoluminescence
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-103439DOI: 10.1364/AO.52.000105ISI: 000313745800061Scopus ID: 2-s2.0-84871949571OAI: oai:DiVA.org:kth-103439DiVA: diva2:560159
Funder
Knut and Alice Wallenberg Foundation, UAW2004.0224
Note

QC 20130205

Available from: 2012-10-12 Created: 2012-10-12 Last updated: 2017-12-07Bibliographically approved

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Toprak, Muhammet S.

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