Molecular design to regulate the photophysical properties of multifunctional TADF emitters towards high-performance TADF-based OLEDs with EQEs up to 22.4% and small efficiency roll-offs†,Chemical Science

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Molecular design to regulate the photophysical properties of multifunctional TADF emitters towards high-performance TADF-based OLEDs with EQEs up to 22.4% and small efficiency roll-offs†
Chemical Science ( IF 7.6 ) Pub Date : 2017-12-13 00:00:00 , DOI: 10.1039/c7sc04669c
Ling Yu ₁ , Zhongbin Wu ₂ , Guohua Xie ₁ , Weixuan Zeng ₁ , Dongge Ma _{2,

3} , Chuluo Yang ₁

Affiliation

Simultaneously achieving high efficiency and low efficiency roll-off remains a big challenge for OLEDs based on thermally activated delayed fluorescence (TADF) emitters. To address this issue, we elaborately designed and synthesized a series of new emitters with both TADF and aggregation-induced emission (AIE) properties by introducing 9,9-dimethyl-9,10-dihydroacridine (DMAC) or 10H-phenoxazine (PXZ) as donor units into a quinoxaline framework. By tuning the electron-donating capability of the donor as well as the amount of donor unit, the photophysical properties of the TADF-AIE emitters can be systematically regulated, with emissions ranging from green to red. We demonstrated efficient doped OLEDs with a maximum EQE of 22.4%, a maximum current efficiency (CE_max) of 80.3 cd A⁻¹ and a maximum power efficiency (PE_max) of 64.1 lm W⁻¹ for the green device, and an EQE_max of 14.1%, a CE_max of 36.1 cd A⁻¹ and a PE_max of 28.1 lm W⁻¹ for the orange device. Remarkably, these orange devices rendered small roll-offs of 1.4% and 21.3% respectively at a luminance of 100 and 1000 cd m⁻². Attributed to the unique TADF and AIE features, the non-doped devices perform outstandingly with an EQE_max of 12.0%, a CE_max of 41.2 cd A⁻¹ and a PE_max of 45.4 lm W⁻¹.

中文翻译：

用于调节多功能 TADF 发射器的光物理特性的分子设计，以实现基于 TADF 的高性能 OLED，其 EQE 高达 22.4%，效率滚降较小†

同时实现高效率和低效率滚降对于基于热激活延迟荧光 (TADF) 发射器的 OLED 来说仍然是一个巨大的挑战。为了解决这个问题，我们通过引入9,9-二甲基-9,10-二氢吖啶（DMAC）或10 H-吩恶嗪（PXZ ）精心设计并合成了一系列兼具TADF和聚集诱导发射（AIE）特性的新型发射体。）作为供体单元进入喹喔啉框架。通过调节供体的电子供体能力以及供体单元的数量，可以系统地调节TADF-AIE发射体的光物理性质，发射范围从绿色到红色。我们展示了高效掺杂 OLED，绿色器件的最大 EQE 为 22.4%，最大电流效率 (CE _max ) 为 80.3 cd A ^-1，最大功率效率 (PE _max ) 为 64.1 lm W ^-1 ，以及 EQE橙色器件的_最大值为 14.1%，CE_最大值为 36.1 cd A ^-1，PE_最大值为 28.1 lm W ^{-1 。}^{值得注意的是，这些橙色器件在亮度为 100 和 1000 cd m -2}时分别呈现 1.4% 和 21.3% 的小幅衰减。由于独特的TADF和AIE特性，非掺杂器件表现出色，EQE最大值_为12.0%，CE_最大值为41.2 cd A ^-1，PE_最大值为45.4 lm W ^-1。

更新日期：2017-12-13

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