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

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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
Advanced Optical Materials ( IF 8.0 ) Pub Date : 2019-05-16 , DOI: 10.1002/adom.201900280
Wenjing Xiong _{1,

2,

3} , Shi Tang ₄ , Petri Murto ₂ , Weiguo Zhu _{1,

3} , Ludvig Edman ₄ , Ergang Wang ₂

Affiliation

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.

中文翻译：

结合主体-来宾聚合物中的苯并三唑和苯并二噻吩主体单元，以实现高效，稳定的发光电化学电池近红外发射

一组以交替的苯并二噻吩和苯并三唑（BTz）衍生物为主体和4,7-双（5-溴噻吩-2-基）-苯并[ c ] [1,2,5]噻二唑为主体的主体-客体共聚物对来宾进行综合，表征和评估以进行应用。包含这种主体-客体共聚物的发光电化学电池（LEC）可在723 nm处达到峰值的快速响应近红外（NIR）发射，并具有169 µW cm ^-2的高辐射度在3.6 V的低驱动电压下，NIR-LEC也具有良好的稳定性，因为连续运行350小时后，峰值NIR输出仅下降了8％。但是，发现LEC性能对宿主主链的详细化学结构高度敏感，并且在BTz单元上添加给电子噻吩桥接单元是高度正向的，而包含氟原子则导致大大降低了性能，大概是由于活性材料中出现了氢键。

更新日期：2019-05-16

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