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Resonant Energy Transfer can Trigger Multiexciton Recombination in Dense Quantum Dot Ensembles
Author(s) -
Rafipoor Mona,
Koll Rieke,
Merkl JanPhilip,
Fruhner Lisa Sarah,
Weller Horst,
Lange Holger
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201803798
Subject(s) - quantum dot , excited state , photoluminescence , förster resonance energy transfer , exciton , ultrafast laser spectroscopy , photoexcitation , nanocrystal , chemical physics , resonant inductive coupling , materials science , auger effect , molecular physics , atomic physics , physics , nanotechnology , energy transfer , optoelectronics , condensed matter physics , auger , spectroscopy , quantum mechanics , fluorescence
Core/shell quantum dots/quantum rods are nanocrystals with typical application scenarios as ensembles. Resonance energy transfer is a possible process between adjacent nanocrystals. Highly excited nanocrystals can also relax energy by multiexciton recombination, competing against the energy transfer. The two processes have different dependencies and can be convolved, resulting in collective properties different from the superposition of the individual nanocrystals. A platform to study the interplay of energy transfer and multiexciton recombination is presented. CdSe/CdS quantum dot/quantum rods encapsulated in amphiphilic micelles with an interparticle distance control by spacer ligands are used for time‐resolved photoluminescence and transient absorption experiments. At exciton populations around one, the ensemble starts to be in a state where energy transfer can trigger multiexciton Auger recombination, altering the collective dynamics.