Quinoline-based TADF emitters exhibiting aggregation-induced emission for efficient non-doped organic light-emitting diodes,Materials Chemistry Frontiers

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Quinoline-based TADF emitters exhibiting aggregation-induced emission for efficient non-doped organic light-emitting diodes
Materials Chemistry Frontiers ( IF 6.0 ) Pub Date : 2020-10-29 , DOI: 10.1039/d0qm00628a
Yi-Fan Shen _{1,

2,

3} , Meng Li _{3,

4,

5} , Wen-Long Zhao _{1,

2,

3} , Yin-Feng Wang _{1,

2,

3,

4,

5} , Hai-Yan Lu _{1,

2,

3} , Chuan-Feng Chen _{1,

2,

3,

4,

5}

Affiliation

The thermally activated delayed fluorescence (TADF) materials with aggregation-induced emission (AIE) properties have attracted increasing interest for their applications as the emitters in non-doped organic light-emitting diodes (OLEDs). In this work, three quinoline-based TADF molecules 9,9-dimethyl-10-(quinolin-2-yl)-9,10-dihydroacridine (DMAC-QL), 10-(quinolin-2-yl)-10H-phenoxazine (PXZ-QL) and 10-(quinolin-2-yl)-10H-phenothiazine (PTZ-QL) were conveniently synthesized by a one-step reaction starting from commercially available materials. The twisted conformation was confirmed by single crystal analysis, and all the compounds exhibited high thermal stability. Moreover, the ΔE_ST values of DMAC-QL, PXZ-QL and PTZ-QL were 0.06, 0.10 and 0.04 eV, and their delay lifetimes were 2.15, 1.86 and 15.76 μs, respectively, indicating their excellent TADF properties. They also exhibited typical AIE and aggregation-induced delayed fluorescence (AIDF) properties in THF/H₂O solution. The non-doped OLEDs based on the emitters DMAC-QL, PXZ-QL and PTZ-QL were fabricated, and the maximal EQEs of the devices were 7.7, 17.3 and 14.8%, respectively, along with turn-on voltages of 3.2, 2.6 and 2.8 eV. It was further found that the efficiency roll-off of the non-doped device based on PXZ-QL was very small due to its short delay lifetime and excellent AIE and AIDF properties.

中文翻译：

喹啉基TADF发射体表现出聚集诱导的发射效率，用于高效的非掺杂有机发光二极管

作为未掺杂有机发光二极管（OLED）中的发射器，具有聚集诱导发射（AIE）特性的热活化延迟荧光（TADF）材料已引起越来越多的关注。在这项工作中，三个基于喹啉TADF分子9,9-二甲基-10-（喹啉-2-基）-9,10-二氢吖啶（DMAC-QL），10-（喹啉-2-基）-10 ħ -苯恶嗪（PXZ-QL）和10-（喹啉-2-基）-10 H-吩噻嗪（PTZ-QL）可以方便地通过一步反应从市售材料开始合成。通过单晶分析证实了扭曲的构象，并且所有化合物均显示出高的热稳定性。此外，ΔE _STDMAC-QL，PXZ-QL和PTZ-QL的值分别为0.06、0.10和0.04 eV，它们的延迟寿命分别为2.15、1.86和15.76μs，表明它们具有出色的TADF特性。它们在THF / H ₂ O溶液中还表现出典型的AIE和聚集诱导的延迟荧光（AIDF）特性。制作了基于发射极DMAC-QL，PXZ-QL和PTZ-QL的非掺杂OLED ，器件的最大EQE分别为7.7、17.3和14.8％，并且开启电压为3.2、2.6和2.8 eV。进一步发现，基于PXZ-QL的非掺杂器件的效率下降由于其短的延迟寿命以及出色的AIE和AIDF特性，因此尺寸非常小。

更新日期：2020-12-10

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