Manipulating the benzenyl π-bridge of bisanthracene derivatives (BDs) for highly efficient deep-blue OLED emitters with CIEy=0.06

作者：Jin, Pengcheng; Yang, Xilin; Yang, Ben^*; Wang, Xiao-Tian; Su, Wen-Tao; Zhan, Shu-Hang; Chen, Xiliang; Sun, Huaming; Su, Shi-Jian^*; Hu, Jian-Yong^*

来源：Journal of Materials Chemistry C, 2024, 12(3): 1069-1076.

DOI：10.1039/d3tc04056a

• LIGHT-EMITTING-DIODES
• FLUORESCENT EMITTERS
• EMISSION
• DEVICES
• DESIGN
• SINGLE
• DONOR
• HOST

Due to the difficulty in balancing high efficiency and high color purity, the development of blue luminescent materials remains a significant challenge in the fields of commercial full-color organic light emitting devices (OLEDs) and solid-state lighting. Herein, we report four deep-blue fluorescent emitters with non-donor-acceptor (non-DA)-type and DA-type structures, namely BD1-DMP (non-DA-type), BD1-DOP (non-DA-type), BD3-DMP (DA-type), and BD3-DOP (DA-type), in which molecular manipulation strategies are applied to modify the benzenyl pi-bridge of bisanthracene derivatives (BDs) with methyl or methoxy substituents. The incorporation of methyl or methoxy groups results in a large distorted configuration, reducing the degree of molecular conjugation, and the emission peak is limited in the deep-blue region, exhibiting high photoluminescence efficiency. The doped OLED device based on BD1-DMP exhibits deep-blue emission (lambda(em,max) = 415 nm), with a maximum external quantum efficiency (EQE) of 7.07% and Commission Internationale de l'Eclairage (CIE) coordinates of (0.15, 0.06), meeting high-definition television (HDTV) display standards. BD1-DMP as the host material and DSA-Ph doped sky-blue devices were further constructed, with a maximum EQE, current efficiency (CE), and luminance of 6.60%, 11.17 cd A(-1), and 16 410 cd m(-2), respectively. It is worth noting that there is only 1.5% EQE roll-off at 1000 cd m(-2). These excellent properties ensure that newly developed BDs can not only be used as doping materials to construct high-efficiency and high-standard deep-blue OLEDs but also as the host material to construct high-efficiency and extremely low roll-off sky-blue devices, which provide more selectivity for the development of deep-blue OLED emitters.