Combining Benzotriazole and Benzodithiophene Host Units in Host–Guest Polymers for Efficient and Stable Near‐Infrared Emission from Light‐Emitting Electrochemical Cells
Source abstract
Abstract
Abstract A set of host–guest copolymers with alternating benzodithiophene and benzotriazole (BTz) derivatives as host units and 4,7‐bis(5‐bromothiophen‐2‐yl)‐benzo[c][1,2,5]thiadiazole as the minority guest are synthesized, characterized, and evaluated for applications. A light‐emitting electrochemical cell (LEC) comprising such a host–guest copolymer delivers fast‐response near‐infrared (NIR) emission peaked at 723 nm with a high radiance of 169 µW cm−2 at a low drive voltage of 3.6 V. The NIR‐LEC also features good stability, as the peak NIR output only drops by 8% after 350 h of continuous operation. It is, however, found that the LEC performance is highly sensitive to the detailed chemical structure of the host backbone, and that the addition of electron‐donating thiophene bridging units onto the BTz unit is highly positive while the inclusion of fluorine atoms results in a drastically lowered performance, presumably because of the emergence of hydrogen bonding within the active material.
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Research context
OpenAlex topics: Organic Light-Emitting Diodes Research · Organic Electronics and Photovoltaics · Conducting polymers and applications
SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.
Affiliations
School of Materials Science and Engineering Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials Jiangsu Engineering Laboratory of Light‐Electricity‐Heat Energy‐Converting Materials and Applications Changzhou University Changzhou 213164 China
Department of Chemistry and Chemical Engineering Chalmers University of Technology SE‐412 96 Göteborg Sweden
College of Chemistry Xiangtan University Xiangtan 411105 China
The Organic Photonics and Electronics Group Umeå University SE‐90187 Umea Sweden
Funding
Vetenskapsrådet · Svenska Forskningsrådet Formas · Stiftelsen för Strategisk Forskning · Energimyndigheten · National Natural Science Foundation of China · Stiftelsen Olle Engkvist Byggmästare · Bertil and Britt Svenssons Stiftelse för Belysningsteknik
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