Quantum dot (QD) sensitized triplet exciton generation has demonstrated promising applications in various fields such as photon up-conversion through triplet–triplet annihilation. However, how direct triplet energy transfer from the QD to the acceptor through Dexter energy transfer (DET) competes with other processes, including Förster resonance energy transfer (FRET) and charge transfer, remains poorly understood. Herein, the competition of these pathways for QD-sensitized triplet excited state generation in CdSe QD-modified boron dipyrromethene (BODIPY) complexes is studied using transient absorption spectroscopy. After excitation of the CdSe QD with 500 nm pulses, the BODIPY triplet excited state is generated through charge recombination in a charge separated intermediate state (QD−·–BODIPY+·). This intermediate state is populated either through FRET from the excited QD to BODIPY followed by electron transfer from the singlet excited state of BODIPY to the QD or through hole transfer from the excited QD to BODIPY. The triplet excited state generation efficiencies from the FRET and hole transfer pathways are estimated to be (6.18 ± 1.39)% and (13.5 ± 3.1)%, respectively. Compared to these indirect pathways, direct DET from the QD to the BODIPY triplet state is kinetically not competitive. These results demonstrate that sequential charge transfer can be an efficient pathway for triplet excited state generation in QD–acceptor complexes.
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7 June 2020
Research Article|
June 01 2020
Competition of Dexter, Förster, and charge transfer pathways for quantum dot sensitized triplet generation
Special Collection:
Up- and Down-Conversion in Molecules and Materials
Tao Jin
;
Tao Jin
1
Department of Chemistry, Emory University
, 1515 Dickey Dr., Atlanta, Georgia 30322, USA
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Natalie Uhlikova;
Natalie Uhlikova
1
Department of Chemistry, Emory University
, 1515 Dickey Dr., Atlanta, Georgia 30322, USA
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Zihao Xu
;
Zihao Xu
1
Department of Chemistry, Emory University
, 1515 Dickey Dr., Atlanta, Georgia 30322, USA
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Yifan Zhu
;
Yifan Zhu
2
Department of Materials Science and NanoEngineering, Rice University
, 6100 Main St., Houston, Texas 77005, USA
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Yiming Huang;
Yiming Huang
2
Department of Materials Science and NanoEngineering, Rice University
, 6100 Main St., Houston, Texas 77005, USA
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Eilaf Egap
;
Eilaf Egap
a)
2
Department of Materials Science and NanoEngineering, Rice University
, 6100 Main St., Houston, Texas 77005, USA
3
Department of Chemical and Biomolecular Engineering, Rice University
, 6100 Main St., Houston, Texas 77005, USA
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Tianquan Lian
Tianquan Lian
a)
1
Department of Chemistry, Emory University
, 1515 Dickey Dr., Atlanta, Georgia 30322, USA
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Note: This paper is part of the JCP Special Topic on Up- and Down-Conversion in Molecules and Materials.
J. Chem. Phys. 152, 214702 (2020)
Article history
Received:
April 07 2020
Accepted:
May 06 2020
Citation
Tao Jin, Natalie Uhlikova, Zihao Xu, Yifan Zhu, Yiming Huang, Eilaf Egap, Tianquan Lian; Competition of Dexter, Förster, and charge transfer pathways for quantum dot sensitized triplet generation. J. Chem. Phys. 7 June 2020; 152 (21): 214702. https://doi.org/10.1063/5.0009833
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