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Title: 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:
ORCiD logo [1];  [1];  [2];  [2]; ORCiD logo [1]; ORCiD logo [2]; ORCiD logo [1]
  1. Department of Chemistry, Emory University, Atlanta, USA
  2. 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. doi: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. doi: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 = {2019},
month = {5}
}

Journal Article:
Free Publicly Available Full Text
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DOI: 10.1039/C9SC01648A

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