材料科学
掺杂剂
钙钛矿(结构)
电致发光
光电子学
咔唑
共轭体系
二极管
量子效率
有机发光二极管
发光二极管
聚合物
纳米技术
兴奋剂
光化学
化学
复合材料
有机化学
图层(电子)
作者
Fangju Tao,Ying Wei,Jian Chen,Jing Wang,Yongxia Wang,Zheng Zhang,Yueting Pu,Kai Wang,Hao Li,Xiaoyan Li,Quanyou Feng,Shufen Chen,Tonglin Yang,Lihui Liu,Linghai Xie,Wei Huang
出处
期刊:Small
[Wiley]
日期:2024-12-15
标识
DOI:10.1002/smll.202406628
摘要
Abstract Despite the remarkable advancements in perovskite light‐emitting diode (PeLED) technology, the development of blue PeLEDs has lagged. The primary bottleneck lies in the difficulty of finding hole transport materials (HTMs) that can both match the energy levels of blue perovskite materials and exhibit efficient hole transport performance. Herein, a novel non‐conjugated polyethylene carbazole‐based polymer (P‐AGCz) is developed that has excellent solution processability and serves as an efficient dopant‐free HTM for PeLEDs. The flexible non‐conjugated polyethylene backbone of P‐AGCz provides exceptional film‐forming capabilities. Moreover, the A‐shaped carbazole‐based side chains deepen the HOMO energy level and minimize the recombination energy, enhancing its ability to inject and transport holes within PeLEDs. The PeLEDs employing P‐AGCz as a low‐cost, dopant‐free polymer HTM have attained an external quantum efficiency (EQE) of 3.26%, which is 1.54 times greater than poly(N‐vinylcarbazole) (PVK)‐based devices, with a brightness enhancement of 584 cd m − 2 over the PVK‐based devices. Furthermore, the P‐AGCz‐based devices exhibit higher current efficiency at lower driving voltages, indicating reduced energy consumption and expanded potential for future applications.
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