Citation: KONG Yi, ZENG Zi-Hui, HUANG Ping, LUO Ye-Lin, ZHANG Bao-Hua, CHEN Li-Juan, ZHANG Yu-Wei, HAN Dong-Xue, CHENG Yan-Xiang, NIU Li. Multiple Modes of Electrochemiluminescence Using Thermally Activated Delayed Fluorescent Polymer[J]. Chinese Journal of Analytical Chemistry, ;2021, 49(6): 1015-1024. doi: 10.19756/j.issn.0253-3820.210424 shu

Multiple Modes of Electrochemiluminescence Using Thermally Activated Delayed Fluorescent Polymer

KONG Yi ¹ ,
ZENG Zi-Hui ¹ ,
HUANG Ping ¹ ,
LUO Ye-Lin ¹ ,
ZHANG Bao-Hua ^1,, ,
CHEN Li-Juan ¹ ,
ZHANG Yu-Wei ¹ ,
HAN Dong-Xue ^1,, ,
CHENG Yan-Xiang ² ,
NIU Li ^1,,

1.
Centre for Advanced Analytical Science, c/o School of Chemistry and Chemical Engineering, Guangzhou University, Guangzhou 510006, China;
2.
State Key Laboratory of Polymer Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China

Corresponding author: ZHANG Bao-Hua, HAN Dong-Xue, NIU Li,
Received Date: 9 April 2021
Revised Date: 24 April 2021

Fund Project: Supported by the Natural Science Foundation of Guangdong Province, China (Nos.2019B010933001, 2021A1515010510) and the National Natural Science Foundation of China (No.51773195).

Thermally activated delayed fluorescent (TADF) emitter is becoming one promising candidate as efficient electrochemiluminescence (ECL) chromophore. Compared to other types of purely organic ECL emitter, TADF emitters possess efficient triplet-to-singlet up-conversion capability via thermal activation, which can be more efficient for ECL emission since the dominant triplets (-75% in total under electrochemical excitation) can be harvested in this case. Previously, restricted by electrochemical stability of TADF emitters, various typical ECL modes, especially for reductive-oxidation co-reactant ECL mode, were not fully realized for TADF-type ECL system. In this work, one backbone-donor/pendant-acceptor type TADF conjugated polymer (named as PFSOTT5) was used to evaluate its potential in ECL topic. Impressively, such polymer displayed good electrochemical behaviors, which rendered the successful realization of all typical ECL mode including annihilation ECL, oxidative-reduction co-reactant ECL, reductive-oxidation co-reactant ECL with good stability. Systematic photophysics, electrochemical and ECL characterization and discussion were performed for PFSOTT5 in this work. Especially, for reductive-oxidation ECL using BPO as co-reactant, PFSOTT5-based ECL displayed stable and efficient ECL emission. The ECL efficiency of PFSOTT5-based ECL was even 5.79 times as compared to the typical fluorescent polymer counterpart. Accordingly, it is anticipated that such TADF polymer ECL has the application potentials in different ECL modes.
- Electrochemiluminescence,
- Thermally activated delayed fluorescence,
- Co-reactant electrochemiluminescence,
- Electrochemistry,
- Triplet excitons
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