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Combining Benzotriazole and Benzodithiophene Host Units in Host-Guest Polymers for Efficient and Stable Near-Infrared Emission from Light-Emitting Electrochemical Cells
Umeå University, Faculty of Science and Technology, Department of Physics.ORCID iD: 0000-0003-1274-5918
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2019 (English)In: Advanced Optical Materials, ISSN 2162-7568, E-ISSN 2195-1071, Vol. 7, no 15, article id 1900280Article in journal (Refereed) Published
Abstract [en]

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 mu W 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.

Place, publisher, year, edition, pages
2019. Vol. 7, no 15, article id 1900280
Keywords [en]
conjugated polymers, host-guest copolymers, near-infrared emission light-emitting electrochemical cells
National Category
Polymer Chemistry
Identifiers
URN: urn:nbn:se:umu:diva-162672DOI: 10.1002/adom.201900280ISI: 000478735800007OAI: oai:DiVA.org:umu-162672DiVA, id: diva2:1347007
Available from: 2019-08-29 Created: 2019-08-29 Last updated: 2019-08-29Bibliographically approved

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Tang, ShiEdman, Ludvig

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