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| Content Provider | IEEE Xplore Digital Library |
|---|---|
| Author | Lunz, M. Bradley, A.L. Wei-Yu Chen Gerard, V.A. Byrne, S.J. Gun'ko, Y.K. Lesnyak, V. Gaponik, N. |
| Copyright Year | 2010 |
| Description | Author affiliation: Physical Chemistry, TU Dresden, Bergstr. 66b, 01062 Dresden, Germany (Lesnyak, V.; Gaponik, N.) || School of Chemistry, Trinity College Dublin, Dublin 2, Ireland (Wei-Yu Chen; Gerard, V.A.; Byrne, S.J.; Gun'ko, Y.K.) || Semiconductor Photonics Group, School of Physics, Trinity College Dublin, Dublin 2, Ireland (Lunz, M.; Bradley, A.L.) |
| Abstract | The impact of intra-ensemble Förster resonant energy transfer (FRET) on the optical properties of monodispersed quantum dot (QD) monolayers and a donor/acceptor FRET bilayer structure are presented. The QD structures are characterized by steady-state absorption and photoluminescence (PL) spectroscopy as well as time-resolved PL measurements. The optical properties of the monodispersed monolayers, such as peak emission wavelength and PL decays, are strongly influenced by FRET from smaller to larger QDs within the ensemble. Comparing several QD samples, the spectral overlap of the QD ensemble and the QD concentration were identified as parameters that allow for tuning of FRET in monodispersed QD structures. For the donor/acceptor QD bilayer structure an unexpected decrease of the FRET efficiency between donor and acceptor layers is observed with increasing donor QD concentration. The concentration-dependent donor lifetime and a constant donor-acceptor FRET rate can explain this decrease within the FRET rate model. Even though the donor-acceptor FRET rate is donor-concentration independent – as expected from theory – its competition with donor-donor energy transfer leads to a concentration dependence of the FRET efficiency from donors to acceptors. This shows that intra-ensemble FRET can have an important impact on device performance. |
| Starting Page | 1 |
| Ending Page | 4 |
| File Size | 161776 |
| Page Count | 4 |
| File Format | |
| ISBN | 9781424477999 |
| e-ISBN | 9781424477982 |
| e-ISBN | 9781424477975 |
| DOI | 10.1109/ICTON.2010.5549154 |
| Language | English |
| Publisher | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Publisher Date | 2010-06-27 |
| Publisher Place | Germany |
| Access Restriction | Subscribed |
| Rights Holder | Institute of Electrical and Electronics Engineers, Inc. (IEEE) |
| Subject Keyword | Energy exchange Nanocrystals Quantum dots Stimulated emission Resonance Steady-state Absorption Photoluminescence Spectroscopy Wavelength measurement spectral overlap Förster resonant energy transfer colloidal quantum dots photoluminescence spectroscopy time-resolved emission decay inhomogeneous broadening |
| Content Type | Text |
| Resource Type | Article |
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