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Tailoring Transition Dipole Moment in Colloidal Nanocrystal Thin Film on Nanocomposite Materials

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Title
Tailoring Transition Dipole Moment in Colloidal Nanocrystal Thin Film on Nanocomposite Materials
Author(s)
Kwang Jin Lee; Kim, Gahyeon; Joonhyung Lim; Nah, Sanghee; Kwang Seob Jeong; Minhaeng Cho
Publication Date
2022-02
Journal
Advanced Optical Materials, v.10, no.4
Publisher
John Wiley and Sons Inc.
Abstract
Controlling the transition dipole moment is extremely important for various photophysical characteristics in semiconductors. Especially, suppression of Auger recombination in quantum dots (QDs) is essential for the development of novel applications, including bioimaging, lasing, and optoelectronic devices. To date, most of the studies on the Auger process are conducted on the basis of manipulating the material property such as wavefunction of electron and hole, energy band, and confinement potential. However, a new way of tuning the Auger process using nanocomposite materials is not reported. In this work, the biexciton Auger recombination (BAR) process in CdSe/CdS(1 ML) nanocrystal thin-film is successfully controlled by introducing nanocomposite materials. Performing pump intensity-dependent transient absorption experiments, a significant reduction (up to 30%) of BAR rate is observed in the presence of nanocomposite structures. This notable suppression effect is attributed to the modulation of the net transition dipole moment. These findings will provide further insight into the rational design of QDs combining with a nanostructure that efficiently suppresses Auger recombination rates.
URI
https://pr.ibs.re.kr/handle/8788114/11607
DOI
10.1002/adom.202102050
ISSN
2195-1071
Appears in Collections:
Center for Molecular Spectroscopy and Dynamics(분자 분광학 및 동력학 연구단) > 1. Journal Papers (저널논문)
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