OLEDs use Förster Resonance Energy Transfer (FRET) and Reverse Intersystem Crossing (RISC) to improve efficiency and brightness. FRET moves singlet excitons over long distances between molecules, while RISC converts triplet excitons into singlet excitons, allowing more light emission. Our research focuses on optimizing these processes in solution-processed OLEDs. By combining phosphorescent platinum (Pt) sensitizers with multi-resonance TADF emitters, we have developed ultrapure blue OLEDs with sharper colors, higher efficiency, and reduced efficiency roll-off. These advancements bring us closer to next-generation high-performance OLED displays. 

Suppression of Initial Degradation via an Interfacial Charge-Induced Overshooting Effect in Solution-Processed Organic Light-Emitting Diodes | ACS Applied Materials & Interfaces

In OLEDs, molecular structure significantly affects performance. DMAC-DPS, with a twisted donor–acceptor–donor (D–A–D) structure, prevents molecular aggregation and maintains high efficiency even at high concentrations. In contrast, Ph-OBNA, with a rigid and planar multi-resonance (MR) structure, enhances color purity but suffers from aggregation-induced quenching (ACQ) at high concentrations.

Our research investigates how these moiety differences impact exciton behavior and energy transfer in hyperfluorescent OLEDs. By optimizing TADF sensitizers, we have developed devices with improved stability, reduced exciton quenching, and enhanced external quantum efficiency (EQE), contributing to the advancement of next-generation high-performance OLEDs.

https://pubs.rsc.org/en/content/articlelanding/2021/tc/d1tc04712d/unauth