Choi Minseok, Jung Woon Ho, Lee Jaeyeop, Bae Yeyun, Lee Kyoungeun, Oh Jiyoon, Lim Jaehoon, Rhee Seunghyun, Roh Jeongkyun
Dept. of Electrical Engineering, Pusan National University Busan 46241 Republic of Korea
Dept. of Energy Science and Center for Artificial Atoms, Sungkyunkwan University Suwon Gyeonggi-do 16419 Republic of Korea.
Nanoscale Adv. 2024 Jun 18;6(17):4369-4375. doi: 10.1039/d4na00348a. eCollection 2024 Aug 20.
Charge imbalance within the emissive layer (EML) has been identified as a major obstacle to achieving high-performance quantum dot light-emitting diodes (QD-LEDs). To address this issue, we propose the use of a compact diamino-based ligand as a universal approach to improve the charge balance within the QD EML. Specifically, we treat QDs symmetrically with 1,4-diaminobutane (DAB) on both the bottom and top sides. This treatment simultaneously modulates the injection properties of electrons and holes, effectively suppressing electron injection into QDs while facilitating hole injection. As a result, QD-LEDs with symmetrical DAB treatment exhibit a 1.5-fold increase in external quantum efficiency and a remarkable 4.5-fold increase in device lifetime. These results highlight the role of the compact diamine-based ligands as highly efficient charge balancers to realize high-performance and highly stable QD-LEDs.
发光层（EML）内的电荷不平衡已被认为是实现高性能量子点发光二极管（QD-LED）的主要障碍。为了解决这个问题，我们提出使用一种紧凑的二氨基配体作为改善量子点EML内电荷平衡的通用方法。具体来说，我们在底部和顶部两侧用1,4-二氨基丁烷（DAB）对称处理量子点。这种处理同时调节电子和空穴的注入特性，有效抑制电子注入量子点，同时促进空穴注入。结果，经过对称DAB处理的QD-LED的外量子效率提高了1.5倍，器件寿命显著提高了4.5倍。这些结果突出了紧凑的二胺基配体作为高效电荷平衡剂在实现高性能和高稳定性QD-LED方面的作用。
