Ultrapure Blue Thermally Activated Delayed Fluorescence (TADF) Emitters Based on Rigid Sulfur/Oxygen-Bridged Triarylboron Acceptor: MR TADF and D–A TADF,The Journal of Physical Chemistry Letters

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Ultrapure Blue Thermally Activated Delayed Fluorescence (TADF) Emitters Based on Rigid Sulfur/Oxygen-Bridged Triarylboron Acceptor: MR TADF and D–A TADF
The Journal of Physical Chemistry Letters ( IF 4.8 ) Pub Date : 2022-08-10 , DOI: 10.1021/acs.jpclett.2c01745
Honglei Gao _{1,

2} , Shaogang Shen _{1,

2} , Yuanyuan Qin _{1,

2} , Guanhao Liu _{1,

2} , Teng Gao _{1,

2} , Xiangyu Dong _{1,

2} , Zhi Pang _{1,

2} , Xin Xie _{1,

2} , Pengfei Wang _{1,

2} , Ying Wang _{1,

2}

Affiliation

Organic light-emitting diodes (OLEDs) still face a significant challenge in finding blue thermally activated delayed fluorescence (TADF) emitters that can achieve narrowband emission and high efficiency. In this work, we successfully design and synthesize a novel kind of TADF emitters based on rigid sulfur/oxygen-bridged triarylboron acceptor for ultrapure blue with narrowband electroluminescence. Time-dependent density functional theory (TD-DFT) calculations and photophysical results indicate the different intramolecular charge-transfer (ICT) character of two emitters. Benefiting from the rigid aromatic framework, both emitters exhibited deep-blue emission at 444 and 447 nm with a small full-width at half-maximum (fwhm) of about 33 nm, and a small singlet (S₁)–triplet (T₁) energy gap (ΔE_ST) of 0.23 and 0.36 eV. Consequently, OLEDs based on PhCz-TOSBA and TPA-TOSBA exhibit deep blue electroluminescence at 456 nm with fwhm of about 55 nm, affording high external quantum efficiencies (EQEs) of 16.69% with CIE coordinates of (0.14, 0.15) and 16.65% with CIE coordinates of (0.14, 0.12), respectively. These findings show that PhCz-TOSBA and TPA-TOSBA are superior emitters in ultrapure blue TADF devices.

中文翻译：

基于刚性硫/氧桥接三芳基硼受体的超纯蓝色热激活延迟荧光 (TADF) 发射器：MR TADF 和 D-A TADF

有机发光二极管 (OLED) 在寻找可实现窄带发射和高效率的蓝色热激活延迟荧光 (TADF) 发射器方面仍面临重大挑战。在这项工作中，我们成功地设计并合成了一种基于刚性硫/氧桥接三芳基硼受体的新型 TADF 发射器，用于具有窄带电致发光的超纯蓝色。时间相关密度泛函理论 (TD-DFT) 计算和光物理结果表明两种发射器的不同分子内电荷转移 (ICT) 特性。受益于刚性芳香骨架，两种发射器均在 444 和 447 nm 处呈现深蓝色发射，半峰全宽 (fwhm) 约为 33 nm，小单线态 (S ₁ )-三线态 (T _{1 )}) 能隙 (Δ E _ST ) 为 0.23 和 0.36 eV。因此，基于PhCz-TOSBA和TPA-TOSBA的 OLED在 456 nm 处表现出深蓝色电致发光，fwhm 约为 55 nm，具有 16.69% 的高外部量子效率 (EQE)，CIE 坐标为 (0.14, 0.15) 和 16.65% CIE 坐标分别为 (0.14, 0.12)。这些发现表明，PhCz-TOSBA和TPA-TOSBA在超纯蓝色 TADF 器件中是优异的发射体。

更新日期：2022-08-10

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