热塑性聚氨酯衬底表面改性及其在柔性OLED 中的应用

打开文本图片集

中图分类号：TN312. 8；O482. 31 文献标识码： ADOI：10. 37188/CJL. 20240352 CSTR：32170. 14. CJL. 20240352

Surface Modification of Thermoplastic Polyurethane Substrate and Its Application in Flexible OLEDs

LI Xinyi1，WU Lishuang2，YANG Huishan2，ZHANG Letian1，XIE Wenfa 1 ，LIU Shihao1*

State Key Laboratory of Integrated Optoelectronics，Jilin University Region，College of Electronic Science and Engineering， Jilin University，Changchun ，China； 2. College of Physics and Information Engineering，Quanzhou Normal University，Quanzhou ，China） ∗ Corresponding Author，E-mail：liushihao@jlu. edu. cn

Abstract：The development of flexible OLEDs relies on high-performance flexible substrates. Thermoplastic poly⁃ urethane（TPU），a polymer material with alternating soft and hard segments in its molecular chains，combines flexi⁃ bility with high strength，making it a promising candidate for flexible OLED substrates. However，commercial TPU surfaces often exhibit microscopic irregularities，such as waviness or roughness，which adversely affect the fabrica⁃ tion of high-precision flexible OLEDs，potentially leading to reduced optical and electrical performance. To address this issue，this study employs solution processing to deposit a poly（ 3，4 -ethylenedioxythiophene）-polystyrene sulfo⁃ nate（PEDOT ∵ PSS）coating on the TPU surface to improve surface quality. Results show that the PEDOT ∵ PSS coat⁃ ing significantly reduced the surface roughness of TPU from 7. 05 nm to 2. 19 nm，enhan cing the uniformity of subse⁃ quent functional layers（e. g. ，emitting layers and electrodes）. Using the modified TPU substrate，top-emitting and bottom-emitting flexible OLEDs were successfully fabricated，achieving maximum external quantum efficiencies of 16. 0% and 15.2% ，respectively，while demonstrating excellent flexibility. This study provides new insights and the⁃ oretical support for the application of TPU in flexible OLEDs and other flexible electronic devices，offering signifi⁃ cant potential for future advancements.

Key words：organic light-emitting device；flexible substrate；thermoplastic urethanes；surface modification

1 引 言

有机发光二极管（Organic light-emitting diode，OLED）因其对比度高、视角广、响应速度快、能耗低等优点，近年来在智能手机、平板电脑、电视、可穿戴设备等领域得到广泛应用，逐渐成为下一代显示技术的重要代表[1-4]。（剩余12441字）