Intense and Stable Near-Infrared Emission from Light-Emitting Electrochemical Cells Comprising a Metal-Free Indacenodithieno[3,2-b]thiophene-Based Copolymer as the Single Emitter,Chemistry of Materials

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Intense and Stable Near-Infrared Emission from Light-Emitting Electrochemical Cells Comprising a Metal-Free Indacenodithieno[3,2-b]thiophene-Based Copolymer as the Single Emitter
Chemistry of Materials ( IF 7.2 ) Pub Date : 2017-09-05 00:00:00 , DOI: 10.1021/acs.chemmater.7b02049
Shi Tang _{1,

2} , Petri Murto ₃ , Xiaofeng Xu ₃ , Christian Larsen _{1,

2} , Ergang Wang ₃ , Ludvig Edman _{1,

2}

Affiliation

We report on the synthesis, characterization, and application of a series of metal-free near-infrared (NIR) emitting alternating donor/acceptor copolymers based on indacenodithieno[3,2-b]thiophene (IDTT) as the donor unit. A light-emitting electrochemical cell (LEC), comprising a blend of the copolymer poly[indacenodithieno[3,2-b]thiophene-2,8-diyl-alt-2,3-diphenyl-5,8-di(thiophen-2-yl)quinoxaline-5,5′-diyl] and an ionic liquid as the single-layer active material sandwiched between two air-stable electrodes, delivered NIR emission (λ_peak = 705 nm) with a high radiance of 129 μW/cm² when driven by a low voltage of 3.4 V. The NIR-LEC also featured good stress stability, as manifested in that the peak NIR output from a nonencapsulated device after 24 h of continuous operation only had dropped by 3% under N₂ atmosphere and by 27% under ambient air. This work accordingly introduces IDTT-based donor/acceptor copolymers as functional metal-free electroluminescent materials in NIR-emitting devices and also provides guidelines for how future NIR emitters should be designed for further improved performance.

中文翻译：

包含无金属茚满二噻吩并[3,2 - b ]噻吩基共聚物的发光电化学电池发出的强烈而稳定的近红外发射作为单个发射体

我们报告了合成，表征和应用的一系列无金属近红外（NIR）发射交替的基于indacenodithieno [3,2- b ]噻吩（IDTT）作为供体单元的供体/受体共聚物。一种发光电化学电池（LEC），包含该共聚物的聚的共混物[indacenodithieno并[3,2- b ]噻吩-2,8-二基ALT -2,3-二苯基-5,8-二（噻吩[2-yl）quinoxaline-5,5'-diyl]和一种离子液体作为夹在两个空气稳定电极之间的单层活性材料，可提供NIR发射（λ_峰值= 705 nm），并具有129μW/ W的高辐射度厘米²当由3.4 V的低压驱动时，NIR-LEC还具有良好的应力稳定性，这一点表现为：在N ₂气氛下，连续运行24小时后，非封装设备的峰值NIR输出仅下降了3％。在环境空气下为27％。因此，这项工作引入了基于IDTT的供体/受体共聚物作为近红外发射器件中的功能性无金属电致发光材料，并为未来的近红外发射器应如何设计以进一步提高性能提供了指导。

更新日期：2017-09-06

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