Circularly Polarized Organic Light‐Emitting Diode Based on Device Functional Layer Materials

Abstract Circularly polarized light‐emitting devices have found extensive application prospects in 3D displays and optoelectronic information. Among them, circularly polarized organic light‐emitting diodes (CP‐OLED), as a rising star of circularly polarized light‐emitting devices, achieved good research results. However, the preparation of CP‐OLED with a high electroluminescence asymmetry factor and high external quantum efficiency is a hot and difficult research topic. At present, the approaches for achieving circularly polarized electroluminescence via CP‐OLED are: 1) Using chiral materials as luminescent materials, 2) Utilizing chiral functional materials. This review summarizes recent methodologies used for manufacturing CP‐OLED. It focuses on the construction strategies and applications of chiral functional materials (chiral host materials, chiral hole transport materials, and chiral electron transport materials) in CP‐OLED. While challenges such as complex chiral design and material interactions persist, advancements in material design and device architecture propel CP‐OLED forward. These developments promise to elevate CP‐OLED as a focal point in optoelectronic research, facilitating high‐performance, circularly polarized luminescence (CPL)‐capable devices for practical applications.