Xu Ting, Fu Jianhui, Wang Xinzhong, Lu Guanhua, Liu Baiquan
Institute of Information Technology, Shenzhen Institute of Information Technology, Shenzhen, China.
School of Advanced Materials, Peking University Shenzhen Graduate School, Peking University, Shenzhen, China.
Front Chem. 2022 Apr 12;10:887900. doi: 10.3389/fchem.2022.887900. eCollection 2022.
Organic light-emitting diodes (OLEDs) have great potential for display, lighting, and near-infrared (NIR) applications due to their outstanding advantages such as high efficiency, low power consumption, and flexibility. Recently, it has been found that the ultrathin emitting nanolayer technology plays a key role in OLEDs with simplified structures through the undoped fabricated process, and exciplex-forming hosts can enhance the efficiency and stability of OLEDs. However, the elementary structure and mechanism of the energy transfer process of ultrathin emitting nanolayers within interface exciplexes are still unclear. Therefore, it is imminently needed to explore the origin of ultrathin emitting nanolayers and their energy process within exciplexes. Herein, the mechanism of films growing to set ultrathin emitting nanolayers (<1 nm) and their energy transfer process within interface exciplexes are reviewed and researched. The UEML phosphorescence dye plays a key role in determining the lifetime of excitons between exciplex and non-exciplex interfaces. The exciplex between TCTA and Bphen has longer lifetime decay than the non-exciplex between TCTA and TAPC, facilitating exciton harvesting. The findings will be beneficial not only to the further development of OLEDs but also to other related organic optoelectronic technologies.
有机发光二极管（OLED）因其具有高效率、低功耗和柔韧性等突出优点，在显示、照明及近红外（NIR）应用方面具有巨大潜力。最近发现，超薄发光纳米层技术通过无掺杂制造工艺在结构简化的OLED中起着关键作用，且形成激基复合物的主体可以提高OLED的效率和稳定性。然而，界面激基复合物中超薄发光纳米层能量转移过程的基本结构和机制仍不清楚。因此，迫切需要探究超薄发光纳米层的起源及其在激基复合物中的能量过程。在此，对形成超薄发光纳米层（<1 nm）的薄膜生长机制及其在界面激基复合物中的能量转移过程进行了综述和研究。UEML磷光染料在决定激基复合物与非激基复合物界面间激子寿命方面起着关键作用。TCTA与Bphen之间的激基复合物比TCTA与TAPC之间的非激基复合物具有更长的寿命衰减，有利于激子俘获。这些发现不仅将有益于OLED的进一步发展，也将有益于其他相关的有机光电子技术。
