| Autor: |
Flatae AM; Laboratory of Nano-Optics and Cμ , University of Siegen , 57072 Siegen , Germany., Tantussi F; Istituto Italiano di Tecnologia , 16163 Genova , Italy., Messina GC; Istituto Italiano di Tecnologia , 16163 Genova , Italy., De Angelis F; Istituto Italiano di Tecnologia , 16163 Genova , Italy., Agio M; Laboratory of Nano-Optics and Cμ , University of Siegen , 57072 Siegen , Germany.; National Institute of Optics (INO-CNR) , 50125 Florence , Italy. |
| Jazyk: |
angličtina |
| Zdroj: |
The journal of physical chemistry letters [J Phys Chem Lett] 2019 Jun 06; Vol. 10 (11), pp. 2874-2878. Date of Electronic Publication: 2019 May 16. |
| DOI: |
10.1021/acs.jpclett.9b01083 |
| Abstrakt: |
Colloidal quantum dots have emerged as a versatile photoluminescent and optoelectronic material. Limitations like fluorescence intermittency, nonradiative Auger recombination, and surface traps are commonly addressed by growing a wide-band-gap shell. However, the shell isolates the excitonic wave function and reduces its interaction with the external environment necessary for different applications. Furthermore, their long emission lifetime hinders their use in high-speed optoelectronics. Here, we demonstrate a high degree of control on the photophysics of a bare core CdTe quantum dot solely by plasmon coupling, showing that more than 99% of the surface defect-state emission from a trap-rich quantum dot can be quenched. Moreover, the band-edge state excitonic and biexcitonic emission rates are Purcell enhanced by 1460- and 613-fold, respectively. Our findings show how plasmon coupling on bare quantum dots could make chemical approaches developed for improving their optical properties unnecessary, with implications for nanoscale lasers, light-emitting devices, solar cells, and ultrafast single-photon sources. |
| Databáze: |
MEDLINE |
| Externí odkaz: |
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