A strategy to construct multifunctional TADF materials for deep blue and high efficiency yellow fluorescent devices,Journal of Materials Chemistry C

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A strategy to construct multifunctional TADF materials for deep blue and high efficiency yellow fluorescent devices
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020/02/21 , DOI: 10.1039/d0tc00039f
Xialei Lv _{1,

2,

3,

4} , Shuaiqiang Sun _{1,

2,

3,

4} , Qing Zhang _{1,

2,

3,

4} , Shaofeng Ye _{1,

2,

3,

4} , Wei Liu _{1,

2,

3,

4} , Yaxiong Wang _{1,

2,

3,

4} , Runda Guo _{1,

2,

3,

4} , Lei Wang _{1,

2,

3,

4}

Affiliation

Three deep blue thermally activated delayed fluorescence (TADF) molecules are designed by connecting three different sterically hindered electron-donating groups with 2,6-diphenylpyrimidine acceptors. The rigid structures based on carbazole derivatives endow them with excellent thermal stability and high photoluminescence quantum yields (PLQYs) of about 0.72–0.74. A deep blue doped device based on SFI34pPM with a CIE_y of 0.09 and a high external quantum efficiency (EQE) of 8.2% is achieved. Also, 3CzPhpPM realizes a maximum EQE of 4.9% with a CIE_x,y of (0.15, 0.06). The high PLQY and triplet energy (∼2.84 eV) allow the three deep blue compounds to be used as hosts for yellow TADF emitters, which realized high-performance yellow devices (EQE_max = 18.6%) with alleviated efficiency roll-off. What's more, 3CzPhpPM combined with the TADF sensitizer and the fluorescent material TBRb achieves a high EQE of 19.1%, which is among the best for yellow fluorescent devices. The bipolar transporting ability and the harvesting of triplet excitons together ensure highly efficient yellow devices. Accordingly, these results shed light on the development of designing multifunctional deep blue TADF materials, particularly offering a smart way to construct high efficiency yellow fluorescent devices.

中文翻译：

构建用于深蓝色和高效黄色荧光设备的多功能TADF材料的策略

通过将三个不同的空间受阻电子给体与2,6-二苯基嘧啶受体连接，设计了三个深蓝色的热激活延迟荧光（TADF）分子。基于咔唑衍生物的刚性结构使它们具有出色的热稳定性和大约0.72-0.74的高光致发光量子产率（PLQYs）。实现了基于SFI34pPM的深蓝色掺杂器件，其CIE _y为0.09，外部量子效率（EQE）为8.2％。此外，3CzPhpPM通过CIE _x，y实现最大4.9％的EQE。（0.15，0.06）。高PLQY和三重态能量（〜2.84 eV）允许将三种深蓝色化合物用作黄色TADF发射体的主体，从而实现了高性能的黄色器件（_最大EQE = 18.6％），并降低了效率衰减。更重要的是，3CzPhpPM结合TADF增敏剂和荧光材料TBRb实现了19.1％的高EQE，这是名列前茅的黄色荧光设备。双极迁移能力和三重态激子的收获共同确保了高效的黄色器件。因此，这些结果为设计多功能深蓝色TADF材料的发展提供了亮点，特别是为构建高效的黄色荧光器件提供了一种明智的方法。

更新日期：2020-04-09

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