Quinoxaline-based thermally activated delayed fluorescence emitters for highly efficient organic light-emitting diodes,Journal of Materials Chemistry C

当前位置： X-MOL 学术 › J. Mater. Chem. C › 论文详情

Our official English website, www.x-mol.net, welcomes your feedback! (Note: you will need to create a separate account there.)

Quinoxaline-based thermally activated delayed fluorescence emitters for highly efficient organic light-emitting diodes
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2023-03-17 , DOI: 10.1039/d2tc04403j
Xiaoning Li ₁ , Yi Chen ₁ , Shuhui Li ₂ , Aisen Li ₃ , Liangjing Tu ₁ , Dongdong Zhang ₄ , Lian Duan ₄ , Yujun Xie ₁ , Ben Zhong Tang _{1,

5} , Zhen Li _{1,

2,

3,

6}

Affiliation

Thermally activated delayed fluorescence (TADF) materials are regarded as the most promising next-generation emitters in organic light-emitting diodes (OLEDs). In this work, three TADF compounds were designed and synthesized based on 1,2,3,4-tetrahydrophenazine as acceptor and 9,9-dimethyl-9,10-dihydroacridine (DMAC-TTPZ), phenoxazine (PXZ-TTPZ), and phenothiazine (PTZ-TTPZ) as donors. Wherein, cyclohexane was introduced to the acceptor segment to improve solubility and weaken the conjugate degree to realize blue-shifted emission. Due to the twisted conformation, the frontier molecular orbital (FMO) overlap was largely minimized, resulting in small singlet-triplet energy splitting (ΔE_ST) of 0.15, 0.09, and 0.07 eV for DMAC-TTPZ, PXZ-TTPZ, and PTZ-TTPZ, respectively. Taking these compounds as emitters for OLEDs, maximum brightness, power efficiency (PE), and external quantum efficiency (EQE) of up to 36 480 cd m⁻², 41.0 lm W⁻¹, and 15.3% were achieved, demonstrating their potential in OLEDs.

中文翻译：

用于高效有机发光二极管的基于喹喔啉的热激活延迟荧光发射器

热激活延迟荧光 (TADF) 材料被认为是有机发光二极管 (OLED) 中最有前途的下一代发射体。本工作以 1,2,3,4-四氢吩嗪为受体，以 9,9-二甲基-9,10-二氢吖啶 ( DMAC-TTPZ )、吩恶嗪 ( PXZ-TTPZ ) 和吩噻嗪 ( PTZ-TTPZ ) 作为供体。其中，在受体链段引入环己烷，提高溶解度，弱化共轭度，实现蓝移发光。由于扭曲的构象，前沿分子轨道 (FMO) 重叠在很大程度上被最小化，导致小的单重态-三重态能量分裂 (Δ E _ST ) 为 0.15、0.09 和 0.07 eV分别为DMAC-TTPZ、PXZ-TTPZ和PTZ-TTPZ。将这些化合物作为OLED的发射体，实现了高达36 480 cd m ^-2、41.0 lm W ^-1和15.3%的最大亮度、功率效率（PE）和外部量子效率（EQE），展示了它们在OLED。

更新日期：2023-03-17

点击分享查看原文

点击收藏

阅读更多本刊最新论文本刊介绍/投稿指南11