Recent Conceptual Advancements in Molecular and Device Design of Hot‐Exciton Materials

Organic light‐emitting diodes (OLEDs) have rapidly developed and demonstrate great advantages for applications as a leading display technology due to their flexibility and low power consumption. However, because long‐lived triplet (T 1 ) excitons readily trigger exciton annihilation effects and promote molecular bond dissociation, blue OLEDs still face key challenges such as efficiency roll‐off at high luminance and insufficient device operational lifetime. Emerging hot‐exciton materials, characterized by rapid high‐lying reverse intersystem crossing processes, can not only achieve nearly 100% singlet exciton yield but also effectively suppress the accumulation of T 1 excitons. Consequently, hot‐exciton‐based blue OLEDs hold great promise for achieving an optimal balance between high efficiency and operational stability. Currently, the molecular design strategies and device physics of hot‐exciton materials require systematic clarification. Herein, we discuss recent works in hot‐exciton materials, focusing on conceptual innovations in molecular design and device engineering, with the aim of providing theoretical insights and technical guidance for the development of high‐performance hot‐exciton materials and OLEDs.