Direct triplet sensitization of oligothiophene by quantum dots
Abstract
Effective sensitization of triplet states is essential to many applications, including triplet–triplet annihilation based photon upconversion schemes. This work demonstrates successful triplet sensitization of a CdSe quantum dot (QD)–bound oligothiophene carboxylic acid (T6). Transient absorption spectroscopy provides direct evidence of Dexter-type triplet energy transfer from the QD to the acceptor without populating the singlet excited state or charge transfer intermediates. Analysis of T6 concentration dependent triplet formation kinetics shows that the intrinsic triplet energy transfer rate in 1 : 1 QD–T6 complexes is 0.077 ns-1 and the apparent transfer rate and efficiency can be improved by increasing the acceptor binding strength. This work demonstrates a new class of triplet acceptor molecules for QD-based upconversion systems that are more stable and tunable than the extensively studied polyacenes.
- Authors:
-
[1];
[1];
[2];
[1]
- Department of Chemistry, Emory University, Atlanta, USA
- Department of Materials Science and NanoEngineering, Department of Chemical and Biomolecular Engineering, Rice University, Houston, USA
- Publication Date:
- Research Org.:
- Emory Univ., Atlanta, GA (United States)
- Sponsoring Org.:
- USDOE Office of Science (SC); National Science Foundation (NSF); Camille and Henry Dreyfus Foundation; Alfred P. Sloan Foundation
- OSTI Identifier:
- 1514725
- Alternate Identifier(s):
- OSTI ID: 1612368
- Grant/Contract Number:
- SC0016004; CHE-1709182; CHE-1821863; TC-18-045; FG_20166748
- Resource Type:
- Published Article
- Journal Name:
- Chemical Science
- Additional Journal Information:
- Journal Name: Chemical Science Journal Volume: 10 Journal Issue: 24; Journal ID: ISSN 2041-6520
- Publisher:
- Royal Society of Chemistry
- Country of Publication:
- United Kingdom
- Language:
- English
- Subject:
- 37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY; Chemistry
Citation Formats
Xu, Zihao, Jin, Tao, Huang, Yiming, Mulla, Karimulla, Evangelista, Francesco A., Egap, Eilaf, and Lian, Tianquan. Direct triplet sensitization of oligothiophene by quantum dots. United Kingdom: N. p., 2019.
Web. doi:10.1039/C9SC01648A.
Xu, Zihao, Jin, Tao, Huang, Yiming, Mulla, Karimulla, Evangelista, Francesco A., Egap, Eilaf, & Lian, Tianquan. Direct triplet sensitization of oligothiophene by quantum dots. United Kingdom. https://doi.org/10.1039/C9SC01648A
Xu, Zihao, Jin, Tao, Huang, Yiming, Mulla, Karimulla, Evangelista, Francesco A., Egap, Eilaf, and Lian, Tianquan. Mon .
"Direct triplet sensitization of oligothiophene by quantum dots". United Kingdom. https://doi.org/10.1039/C9SC01648A.
@article{osti_1514725,
title = {Direct triplet sensitization of oligothiophene by quantum dots},
author = {Xu, Zihao and Jin, Tao and Huang, Yiming and Mulla, Karimulla and Evangelista, Francesco A. and Egap, Eilaf and Lian, Tianquan},
abstractNote = {Effective sensitization of triplet states is essential to many applications, including triplet–triplet annihilation based photon upconversion schemes. This work demonstrates successful triplet sensitization of a CdSe quantum dot (QD)–bound oligothiophene carboxylic acid (T6). Transient absorption spectroscopy provides direct evidence of Dexter-type triplet energy transfer from the QD to the acceptor without populating the singlet excited state or charge transfer intermediates. Analysis of T6 concentration dependent triplet formation kinetics shows that the intrinsic triplet energy transfer rate in 1 : 1 QD–T6 complexes is 0.077 ns-1 and the apparent transfer rate and efficiency can be improved by increasing the acceptor binding strength. This work demonstrates a new class of triplet acceptor molecules for QD-based upconversion systems that are more stable and tunable than the extensively studied polyacenes.},
doi = {10.1039/C9SC01648A},
journal = {Chemical Science},
number = 24,
volume = 10,
place = {United Kingdom},
year = {Mon May 13 00:00:00 EDT 2019},
month = {Mon May 13 00:00:00 EDT 2019}
}
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