Pyridine-Based Bipolar Host Materials for Phosphorescent OLEDs

doi:10.6023/A25080281

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吡啶类双偶极主体材料及有机电致磷光器件

徐冬青^a, 童海姗^a, 史路延^a, 张婷^*,b

^a安徽科技学院生物医学与健康学院安徽凤阳 233100
^b安徽科技学院化学与材料工程学院安徽蚌埠 233030

投稿日期:2025-08-17
基金资助:
安徽省教育厅自然科学基金重点项目(2023AH051883);省级大学生创新课题(S202410879200);上海勍臻检测技术有限公司的企业横向项目(880772).

Pyridine-Based Bipolar Host Materials for Phosphorescent OLEDs

Xu Dongqing^a, Dong Haishan^a, Shi Luyan^a, Zhang Ting^*,b

^aCollege of Biomedical and Health Institution, Anhui Science and Technology University, Fengyang, Anhui 233100, China
^bSchool of Chemistry and Material Engineering, Anhui Science and Technology University, Bengbu, Anhui 233030, China

Received:2025-08-17
Contact: * E-mail: zhangt@ahstu.edu.cn
Supported by:
Key Research Funds of Anhui Province (2023AH051883), the Student's Platform for Innovation and Entrepre neurship Training Program of Anhui Province (S202410879200) and Shanghai Qing Zhen Test Technology Co., Ltd., China (880772).

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Abstract

Achieving an excellent device performance with slow roll-off efficiency is still a crucial requirement for organic light-emitting diodes (OLED) in displays and white lighting applications. Therefore, we selected carbazole as the hole transporting group (p-type unit), phenylene as the linkage unit and pyridine as the electron transporting unit (n-type unit), to construct two bipolar host materials o-2CzPy and m-2CzPy, by varying the ortho- and meta-linking modes.Their chemical structures were confirmed by mass spectrometry (TOF-MS-EI), ¹H and ¹³C NMR spectroscopy, and elemental analysis. These two materials have good thermal stability with the thermal decomposition temperatures of than 360 ℃ and efficient hole- and electron-transporting properties. FIrpic and Ir(ppy)₃ based blue and green PhOLEDs incorporating o-2CzPy and m-2CzPy as hosts show pretty color purity, good high efficiencies and slow efficiency roll-off. Among them, the maximum current efficiency of 45.16 cd A^-1 and external quantum efficiency of 24.44% were achieved for o-2CzPy based blue device, which are close to the best values for FIrpic-based blue PhOLEDs with single bipolar host reported in recent literatures. Furthermore, the o-2CzPy based green device achieved the high efficiencies of 28.58% and 96.91 cd A^-1, and stable emission color of ΔCIEy≤0.0001. Even at the practical brightness of 1000 cd m^-2 and 6000 cd m^-2, the external quantum efficiencies of o-2CzPy hosted green device still keep as high as 28.03% and 24.70%, with the slight efficiency reduction of 1.9% and 13.6%. These excellent results indicate that these bipolar host materials may find practical applications in highly efficient and stable OLED displays.

Key words: phosphorescent organic light-emitting diodes (PhOLEDs), bipolar host materials, pyridine, low roll-off, carbazole

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Xu Dongqing, Dong Haishan, Shi Luyan, Zhang Ting. Pyridine-Based Bipolar Host Materials for Phosphorescent OLEDs[J]. Acta Chimica Sinica, doi: 10.6023/A25080281.

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吡啶类双偶极主体材料及有机电致磷光器件

Pyridine-Based Bipolar Host Materials for Phosphorescent OLEDs

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