Efficient non-doped yellow OLEDs based on thermally activated delayed fluorescence conjugated polymers with an acridine/carbazole donor backbone and triphenyltriazine acceptor pendant†,Journal of Materials Chemistry C

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Efficient non-doped yellow OLEDs based on thermally activated delayed fluorescence conjugated polymers with an acridine/carbazole donor backbone and triphenyltriazine acceptor pendant†
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-12-18 00:00:00 , DOI: 10.1039/c7tc04994c
Yanjie Wang _{1,

2,

3,

4,

5} , Yunhui Zhu _{1,

2,

3,

4,

5} , Xingdong Lin _{1,

2,

3,

4,

5} , Yike Yang _{1,

2,

3,

4,

5} , Baohua Zhang _{1,

2,

3,

4,

5} , Hongmei Zhan _{1,

2,

3,

4,

5} , Zhiyuan Xie _{1,

2,

3,

4,

5} , Yanxiang Cheng _{1,

2,

3,

4,

5}

Affiliation

Polymers with thermally activated delayed fluorescence (TADF) are very suitable and promising emitters for use in solution-processed organic light-emitting diodes (OLEDs). However, only a few efficient TADF polymers have been reported to date. In this work, a series of polymers with acridine/carbazole donor backbones and triphenyltriazine acceptor pendant are synthesized. The polymers show remarkable TADF due to the intrinsic twisted donor/acceptor structure derived from the copolymerization monomer and have a high photoluminescence quantum yield of up to 90%, in neat films, through management of the monomer ratios. Non-doped OLEDs based on the polymers display a yellow emission and achieve maximum external quantum and power efficiencies of up to 15.5% and 50.5 lm W⁻¹. More importantly, the non-doped devices possess low turn-on and driving voltages of 2.53 V and 4.05 V (1000 cd m⁻²) with an extremely small efficiency roll-off of as low as 0.5%. Compared with doped devices, non-doped devices exhibit superior electroluminescent performances, with similar efficiencies but a lower efficiency roll-off and driving voltage, verifying that the designed conjugated polymers are superior emitters for non-doped TADF OLEDs by simple solution-processing.

中文翻译：

基于具有activated啶/咔唑供体主链和三苯基三嗪受体侧链的热活化延迟荧光共轭聚合物的高效非掺杂黄色OLED †

具有热激活延迟荧光（TADF）的聚合物非常适合用于溶液处理的有机发光二极管（OLED）中，并且很有前途。然而，迄今为止，仅报道了几种有效的TADF聚合物。在这项工作中，合成了具有with啶/咔唑供体主链和三苯基三嗪受体侧基的一系列聚合物。聚合物由于衍生自共聚单体的内在扭曲的供体/受体结构而显示出显着的TADF，并且通过管理单体比率，在纯净薄膜中具有高达90％的高光致发光量子产率。基于聚合物的非掺杂OLED显示黄色发射，并实现高达15.5％和50.5 lm W ^-1的最大外部量子效率和功率效率。更重要的是，非掺杂器件具有2.53 V和4.05 V（1000 cd m ^-2）的低导通电压和驱动电压，而效率降落非常低，仅为0.5％。与掺杂器件相比，非掺杂器件显示出优异的电致发光性能，具有相似的效率，但效率下降率和驱动电压更低，从而证明了所设计的共轭聚合物通过简单的溶液处理方法成为非掺杂TADF OLED的优异发射体。

更新日期：2017-12-18

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