Organic light-emitting diodes (OLEDs) are advantageous due to their flexibility; however, the use of traditional transparent anode ITO limits this flexibility. This study proposes using polybenzodifuranedione (PBFDO) as a flexible transparent anode. n-butanol was added to the PBFDO solution to reduce viscosity and freezing point. High-quality PBFDO films were obtained, and devices using a PBFDO anode and Super Yellow emitting layer showed excellent performance (2.6 V threshold voltage, 12.8 cd A−1 maximum luminous efficiency), comparable to ITO-based devices. Flexible devices on PEN substrates also achieved satisfactory performance (7.7 cd A−1).

Jin Xu, Ke Du, Feng Peng, Zhenzhong Sun, Zhiming Zhong, Weiji Feng, Lei Ying