Affiliation:
1. Key Laboratory of Flexible Electronics (KLoFE) School of Flexible Electronics (Future Technologies) Nanjing Tech University (NanjingTech) Nanjing 211816 China
2. State Key Laboratory of Organic Electronics and Information Displays Nanjing University of Posts and Telecommunications Nanjing 210023 China
Abstract
AbstractEmerging 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 cm2, 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.
Funder
National Key Research and Development Program of China
National Natural Science Foundation of China
Natural Science Foundation of Jiangsu Province