吡啶类双偶极主体材料及有机电致磷光器件

doi:10.6023/A25080281

研究论文

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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1. Supporting Information-A25080281.pdf(3470KB)

摘要/Abstract

在平板显示和白光照明领域,同时具有高效率和低效率滚降仍然是有机电致发光器件(OLED)必须满足的关键要求。因此以咔唑为空穴传输单元(p-型基团),亚苯基作为连接单元,将吡啶引入分子结构中作为电子传输单元（n-型基团）,通过邻位和间位的连接形式设计并制备了两种双偶极主体材料o-2CzPy和m-2CzPy。这两种主体材料具有良好的热稳定性和双偶极电荷传输能力,掺杂FIrpic和Ir(ppy)₃的蓝色和绿色磷光器件获得了高色纯度、高效率和低效率滚降。其中,基于o-2CzPy的蓝光器件最大外量子效率和电流效率分别达到了24.44%和45.16 cd A^-1,接近于目前文献报道的掺杂FIrpic蓝色磷光器件中的最佳数据。此外,基于o-2CzPy的绿光器件也获得了较高的外量子效率和电流效率,分别为28.58%和96.91 cd A^-1;稳定的发光颜色,CIEy变化不超过0.0001。这些结果表明这些主体材料有望在高效率且稳定的OLED显示领域中得到实际应用。

关键词: 磷光有机电致发光器件(PhOLEDs), 双偶极主体材料, 吡啶, 低效率滚降, 咔唑

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

引用此文

徐冬青, 童海姗, 史路延, 张婷. 吡啶类双偶极主体材料及有机电致磷光器件[J]. 化学学报, doi: 10.6023/A25080281.

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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