Diphenylamine/triazine hybrids as bipolar hosts for phosphorescent organic light-emitting diodes,Journal of Materials Chemistry C

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Diphenylamine/triazine hybrids as bipolar hosts for phosphorescent organic light-emitting diodes
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020/02/22 , DOI: 10.1039/c9tc06731k
Yaxing Zhang _{1,

2,

3,

4,

5} , Yuanyuan Zheng _{1,

2,

3,

4,

5} , Binyan Wang _{1,

2,

3,

4,

5} , Huijuan Ran _{1,

2,

3,

4,

5} , Xiaoli Wang _{6,

7,

8,

9,

10} , Jian-Yong Hu _{1,

2,

3,

4,

5} , Qiang Wang _{1,

2,

3,

4,

5}

Affiliation

Bipolar host materials employing diphenylamine (DPA) as a donor unit and triazine (TRZ) as an acceptor unit could achieve suitable energy levels and balanced charge transporting properties, which are necessary for high performance organic light-emitting diodes (OLEDs). In this work, three DPA/TRZ based host materials, named 2-(4-(N,N-diphenylamino)phenyl)-4,6-diphenyl-1,3,5-triazine (DPA–TRZ), 2,4-bis(4-(N,N-diphenylamino)phenyl)-6-phenyl-1,3,5-triazine (DDPA–TRZ), and 2,4,6-tris(4-(N,N-diphenylamino)phenyl)-1,3,5-triazine (TDPA–TRZ), were designed and synthesized. Their thermal, photophysical, electrochemical, and carrier transporting properties were investigated to reveal the relationship between their molecular structure and properties. The number of DPA units could regularly tune the optical and electrical properties of the hybrids. The triplet excited state energy (E_T) values of DPA–TRZ, DDPA–TRZ, and TDPA–TRZ are 2.38, 2.51, and 2.73 eV, respectively. To evaluate the electroluminescence properties of the three host materials, blue, green, red, and white phosphorescent OLEDs (PhOLEDs) were fabricated and characterized. With the highest E_T value, TDPA–TRZ can afford from blue to red phosphorescent emitters. All these devices exhibited EQEs of over 20% with relatively low efficiency roll-offs. The single-host white PhOLEDs based on TDPA–TRZ showed impressive color stability and superior color rendition. These results demonstrate that the combination of DPA and TRZ is an effective way to construct highly efficient bipolar host materials.

中文翻译：

二苯胺/三嗪杂化物作为磷光有机发光二极管的双极性主体

使用二苯胺（DPA）作为施主单元和三嗪（TRZ）作为受主单元的双极性主体材料可以实现合适的能级和平衡的电荷传输特性，这对于高性能有机发光二极管（OLED）而言是必需的。在这项工作中，三种基于DPA / TRZ的基质材料被称为2-（4-（N，N - N-二苯氨基）苯基）-4,6-二苯基-1,3,5-三嗪（DPA–TRZ），2,4 -双（4-（N，N-二苯氨基）苯基）-6-苯基-1,3,5-三嗪（DDPA-TRZ）和2,4,6-tris（4-（N，N-diphenylamino）phenyl）-1,3,5-triazine（TDPA–TRZ），被设计和合成。研究了它们的热，光物理，电化学和载流子传输性质，以揭示它们的分子结构与性质之间的关系。DPA单元的数量可以定期调整杂化体的光学和电学性质。DPA–TRZ，DDPA–TRZ和TDPA–TRZ的三重态激发态能量（E _T）分别为2.38、2.51和2.73 eV。为了评估三种主体材料的电致发光特性，制造并表征了蓝色，绿色，红色和白色磷光OLED（PhOLED）。E _T最高值，TDPA–TRZ可以提供从蓝色到红色的磷光发射器。所有这些器件均表现出超过20％的EQE，并且效率下降幅度相对较低。基于TDPA-TRZ的单基质白色PhOLED表现出令人印象深刻的色彩稳定性和出色的色彩再现性。这些结果表明，DPA和TRZ的组合是构建高效双极基质材料的有效方法。

更新日期：2020-04-03

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