Li Mengyuan, Zhang Yahui, Yu Ningning, Chen Wenyu, Gong Huaqiang, Zheng Yingying, Ni Mingjian, Han Yamin, Sun Ning, Bai Lubing, An Xiang, Yang Jing, Lin Yingru, Huang Wenxin, Zhuo Zhiqiang, Liang Xinyu, Wang Lizhi, Sun Lili, Xu Man, Lin Jinyi, Huang Wei
Key Laboratory of Flexible Electronics (KLoFE), School of Flexible Electronics (Future Technologies), Nanjing Tech University (NanjingTech), Nanjing, 211816, China.
State Key Laboratory of Organic Electronics and Information Displays, Nanjing University of Posts and Telecommunications, Nanjing, 210023, China.
Adv Mater. 2024 May;36(19):e2307605. doi: 10.1002/adma.202307605. Epub 2024 Feb 23.
Emerging printed large-area polymer light-emitting diodes (PLEDs) are essential for manufacturing flat-panel displays and solid lighting devices. However, it is challenging to obtain large-area and stable ultradeep-blue PLEDs because of the lack of light-emitting conjugated polymers (LCPs) with robust deep-blue emissions, excellent morphological stabilities, and high charging abilities. Here, a novel unsymmetrically substituted polydiarylfluorene (POPSAF) is obtained with stable narrowband emission for large-area printed displays via triphenylamine (TPA) spirofunctionalization of LCPs. POPSAF films show narrowband and stable ultradeep-blue emission with a full width at half maximum (FWHM) of 36 nm, associated with their intrachain excitonic behavior without obvious polaron formation. Compared to controlled poly[4-(octyloxy)-9,9-diphenylfluoren-2,7-diyl]-co-[5-(octyloxy)-9,9-diphenylfluoren-2,7-diyl] (PODPF), excellent charge transport is observed in the POPSAF films because of the intrinsic hole transport ability of the TPA units. Large-area PLEDs are fabricated via blade-coating with an emission area of 9 cm, which exhibit uniform ultradeep-blue emission with an FWHM of 36 nm and corresponding Commission internationale de l'éclairage (CIE) coordinates of (0.155, 0.072). These findings are attributed to the synergistic effects of robust emission, stable morphology, and printing capacity. Finally, preliminary printed passive matrix (PM) PLED displays with 20 × 20 pixels monochromes are fabricated, confirmed the effectiveness of spirofunctionalization in optoelectronics.
新兴的印刷大面积聚合物发光二极管（PLED）对于制造平板显示器和固态照明设备至关重要。然而，由于缺乏具有强大深蓝色发射、优异形态稳定性和高充电能力的发光共轭聚合物（LCP），获得大面积且稳定的超深蓝色PLED具有挑战性。在此，通过LCP的三苯胺（TPA）螺官能化获得了一种新型的不对称取代聚二芳基芴（POPSAF），用于大面积印刷显示器，具有稳定的窄带发射。POPSAF薄膜显示出窄带且稳定的超深蓝色发射，半高宽（FWHM）为36nm，这与其链内激子行为相关，且无明显极化子形成。与对照的聚[4 - （辛氧基） - 9,9 - 二苯基芴 - 2,7 - 二基] - 共 - [5 - （辛氧基） - 9,9 - 二苯基芴 - 2,7 - 二基]（PODPF）相比，由于TPA单元的固有空穴传输能力，在POPSAF薄膜中观察到了优异的电荷传输。通过刮涂制备了发射面积为9平方厘米的大面积PLED，其呈现出均匀的超深蓝色发射，FWHM为36nm，相应的国际照明委员会（CIE）坐标为（0.155, 0.072）。这些发现归因于强大发射、稳定形态和印刷能力的协同效应。最后，制备了具有20×20像素单色的初步印刷无源矩阵（PM）PLED显示器，证实了螺官能化在光电子学中的有效性。
