Modulated fluorescence of colloidal quantum dots embedded in a porous alumina membrane
2013 (English)In: Journal of Physical Chemistry B, ISSN 1520-6106, E-ISSN 1520-5207, Vol. 177, no 45, 14151-14156 p.Article in journal (Refereed) Published
The fluorescence spectrum of CdSe core-CdS/ZnS shell colloidal quantum dots (QDs) embedded in porous alumina membrane was studied. Small peaks, superimposed on the principal QD fluorescence spectrum, were observed. Finite-difference time-domain simulation indicates that the QD point radiation emitting from within the membrane is strongly modulated by the photonic band structure introduced by the membrane pores, leading to the observed fine spectral features. Moreover, the principal QD fluorescence peak red-shifted when the optical excitation power was increased, which is attributed to QD material heating due to emitted phonons when the photoexcited electron and hole relax nonradiatively from high-energy states to the ground exciton state before fluorescence.
Place, publisher, year, edition, pages
2013. Vol. 177, no 45, 14151-14156 p.
Colloidal quantum dots, Finite difference time domain simulations, Fluorescence peak, Fluorescence spectra, Photoexcited electrons, Photonic band structures, Porous alumina membranes, Spectral feature
IdentifiersURN: urn:nbn:se:kth:diva-136255DOI: 10.1021/jp409132eISI: 000327111200024ScopusID: 2-s2.0-84887899102OAI: oai:DiVA.org:kth-136255DiVA: diva2:675658
FunderSwedish Research Council, 621-2011-4381 B0460801Science for Life Laboratory - a national resource center for high-throughput molecular bioscience
QC 201312172013-12-042013-12-042016-09-02Bibliographically approved