Combining Benzotriazole and Benzodithiophene Host Units in Host–Guest Polymers for Efficient and Stable Near‐Infrared Emission from Light‐Emitting Electrochemical Cells

Wenjing Xiong, Weiguo Zhu*, Petri Murto, Ludvig Edman*, Ergang Wang*

*Corresponding author for this work

Research output: Contribution to journalArticleScientificpeer-review

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.
Original languageEnglish
Article number1900280
JournalADVANCED OPTICAL MATERIALS
Volume7
Issue number15
DOIs
Publication statusPublished - 5 Aug 2019
MoE publication typeA1 Journal article-refereed

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