Excitonic Enhancement Of Nonradiative Energy Transfer From A Quantum Well In The Optical Near Field Of Energy Gradient Quantum Dots
| Autor: | Sedat Nizamoglu, Pedro Ludwig Hernandez-Martinez, Hilmi Volkan Demir, Evren Mutlugun, Durmus U. Karatay |
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| Přispěvatelé: | Demir, Hilmi Volkan, School of Electrical and Electronic Engineering |
| Rok vydání: | 2012 |
| Předmět: |
Nonradiative energy transfer
Density matrix Materials science Physics and Astronomy (miscellaneous) Near field interactions Exciton Population Exciton migration Mono-dispersed Condensed Matter::Materials Science Semiconductor quantum dots Nanocrystal structures education Semiconductor quantum wells Biexciton Quantum well Room temperature Nanocrystal quantum dots education.field_of_study Condensed matter physics Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Nanocrystal Energy transfer Quantum dot Engineering::Electrical and electronic engineering [DRNTU] Quasiparticle Optical near field Excitons Energy gradients Exciton transfer |
| Zdroj: | Applied Physics Letters |
| Popis: | We report strong exciton migration with an efficiency of 83.3% from a violet-emitting epitaxial quantum well (QW) to an energy gradient colloidal construct of layered green-and red-emitting nanocrystal quantum dots (NQDs) at room temperature, enabled by the interplay between the exciton population and the depopulation of states in the optical near field. Based on the density matrix formalization of near-field interactions, we theoretically model and demonstrate that the energy gradient significantly boosts the QW-NQDs exciton transfer rate compared to using mono-dispersed NQDs, which is in agreement with the observed experimental results. (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4724109] |
| Databáze: | OpenAIRE |
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