Proceedings of nanoGe Fall Meeting 2018 (NFM18)
DOI: https://doi.org/10.29363/nanoge.nfm.2018.195
Publication date: 6th July 2018
Delayed exciton emission has been extensively studied in several types of low dimensional semiconductors but is still not fully understood. The photon energy of delayed emission is identical to that of the spontaneous exciton emission, but it occurs on an extended time scale, from the life time for spontaneous emission (typical 20 ns) to the microsecond and even millisecond regime. In a heuristic way, we might say that the exciton is stored as non-radiative state in the nanocrystal for a variable time without (much) energy loss. The stored energy finally returns to the radiative state and emission can occur.
I will review our work on the characterization of delayed emission of low dimensional CdSe systems (core-shell quantum dots, rods, and platelets) which was performed on the ensemble level as well as on the single-dot level. I will also relate the phenomenon of delayed emission to another extensively studied phenomenon in these systems, namely blinking. In another contribution from our group the interplay between spontaneous emission, delayed emission and energy transfer as observed in QD supraparticles will be presented.
Reduced Auger Recombination in Single CdSe/CdS Nanorods by One-Dimensional Electron Delocalization." Nano Letters 13(10): 4884-4892.
Delayed Exciton Emission and Its Relation to Blinking in CdSe Quantum Dots." Nano Letters 15(11): 7718-7725.
Dynamics of Intraband and Interband Auger Processes in Colloidal Core-Shell Quantum Dots." Acs Nano 9(10): 10366-10376.
Temporary Charge Carrier Separation Dominates the Photoluminescence Decay Dynamics of Colloidal CdSe Nanoplatelets." Nano Letters 16(3): 2047-2053.
Composite Supraparticles with Tunable Light Emission." Acs Nano 11(9): 9136-9142.
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