Issue 24, 2019
From the journal:

Chemical Science

Direct triplet sensitization of oligothiophene by quantum dots†

Zihao Xu, ORCID logo a   Tao Jin,a   Yiming Huang,b   Karimulla Mulla,b   Francesco A. Evangelista, ORCID logo *a   Eilaf Egap ORCID logo *b  and  Tianquan Lian ORCID logo *a  

* Corresponding authors

a Department of Chemistry, Emory University, 1515 Dickey Dr, Atlanta, GA, USA
E-mail: francesco.evangelista@emory.edu, tlian@emory.edu

b Department of Materials Science and NanoEngineering, Department of Chemical and Biomolecular Engineering, Rice University, 6100 Main St, Houston, TX, USA
E-mail: ee30@rice.edu

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.

Graphical abstract: Direct triplet sensitization of oligothiophene by quantum dots

About
Cited by
Related
Download options Please wait...

Supplementary files

Article information

DOI
https://doi.org/10.1039/C9SC01648A
Article type
Edge Article
Submitted
03 Apr 2019
Accepted
12 May 2019
First published
13 May 2019
This article is Open Access

All publication charges for this article have been paid for by the Royal Society of Chemistry
Creative Commons BY-NC license

Chem. Sci., 2019,10, 6120-6124

Permissions

Request permissions

Direct triplet sensitization of oligothiophene by quantum dots

Z. Xu, T. Jin, Y. Huang, K. Mulla, F. A. Evangelista, E. Egap and T. Lian, Chem. Sci., 2019, 10, 6120 DOI: 10.1039/C9SC01648A

This article is licensed under a Creative Commons Attribution-NonCommercial 3.0 Unported Licence. You can use material from this article in other publications, without requesting further permission from the RSC, provided that the correct acknowledgement is given and it is not used for commercial purposes.

To request permission to reproduce material from this article in a commercial publication, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party commercial publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements