Aggregation-induced emission polymers for high performance PLEDs with low efficiency roll-off,Materials Chemistry Frontiers

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Aggregation-induced emission polymers for high performance PLEDs with low efficiency roll-off
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2020-02-17 , DOI: 10.1039/d0qm00012d
Jiabao Gu _{1,

2,

3,

4,

5} , Zeng Xu _{1,

2,

3,

4,

5} , Dongge Ma _{1,

2,

3,

4,

5} , Anjun Qin _{1,

2,

3,

4,

5} , Ben Zhong Tang _{1,

2,

3,

4,

5}

Affiliation

As the congener of organic light-emitting diodes, polymeric light-emitting diodes (PLEDs) possess a number of distinct merits, such as a low-cost wet fabrication process, which make them applicable in large-area flexible display and lighting fields. However, most emissive polymers used in PLEDs suffer from the aggregation-caused quenching (ACQ) effect, which makes the device show large efficiency roll-off. In this work, two polymers, pTPE-DPA-Cz and pTPE-DPA-Flu, featuring aggregation-induced emission (AIE) characteristics were facilely synthesized through Suzuki–Miyaura polycoupling reaction by incorporating the AIE unit of TPE-DPA in their main chains. The resultant polymers possess good film-forming ability, excellent thermal stability and high photoluminescence quantum yields (PLQYs) in their film states, facilitating the fabrication of PLEDs through a solution process. Indeed, the PLEDs using pTPE-DPA-Cz and pTPE-DPA-Flu as emitting layers (EMLs) could achieve a maximum external quantum efficiency (EQE) of 3.26% (doped EML) and current efficiency of 3.69 cd A⁻¹ (non-doped EML). Notably, all the devices exhibit a quite low efficiency roll-off. This work indicates that AIE polymers are ideal candidates for the construction of high performance PLEDs with low efficiency roll-off.

中文翻译：

聚集诱导的发射聚合物，用于具有低效率滚降的高性能PLED

作为有机发光二极管的同类产品，聚合物发光二极管（PLED）具有许多独特的优点，例如低成本的湿法制造工艺，使其可应用于大面积的柔性显示和照明领域。然而，大多数用于PLED的发光聚合物会遭受聚集引起的猝灭（ACQ）效应，这使该器件显示出较大的效率滚降。在这项工作中，通过将TPE-DPA的AIE单元结合到Suzuki-Miyaura的多偶联反应中，轻松合成了具有聚集诱导发射（AIE）特征的两种聚合物pTPE-DPA-Cz和pTPE-DPA-Flu。。所得聚合物在其薄膜状态下具有良好的成膜能力，出色的热稳定性和高的光致发光量子产率（PLQYs），通过解决方案简化了PLED的制造。实际上，使用pTPE-DPA-Cz和pTPE-DPA-Flu作为发光层（EML）的PLED可以实现3.26％的最大外部量子效率（EQE）（掺杂的EML）和3.69 cd A的电流效率^-1（非掺杂的EML）。值得注意的是，所有器件的效率下降都很低。这项工作表明，AIE聚合物是构建低效率滚降的高性能PLED的理想选择。

更新日期：2020-02-17

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