Thursday, May 2025

05:00 PM - 08:00 PM

Room: 220A

Session: OLED Posters

The Energy Transfer and Utilization Mechanisms of Dual-EML Blue OLEDs

Late-News

Description:

In current commercializing OLED panels? blue devices still mainly utilize traditional fluorescent emission mechanisms due to the shorter lifetime and low color purity of blue PH-OLEDs and TADF-OLEDs. Despite the internal quantum efficiency (IQE) can be achieved 62.5% by using commercial blue host materials with Triplet-Triplet Fusion (TTF) characteristics, the external quantum efficiency (EQE ) of blue fluorescent devices doesn't look respectable on account of incomplete utilization of triplet excitons, such as aggregation-caused quenching (ACQ) and triplet-polaron quenching (TPQ). In recent years, the dual-EML blue devices were developed to improve efficiencies of fluorescence OLEDs. However, the energy transfer and utilization mechanisms are still unclear understanding. To accelerating the commercialization of Dual-EML blue devices, our team present a novel device structure system to analysis the different energy utilization mechanisms between EML1 and EML2. The blue device exhibits high efficiency~300 BI and great improvement of lifetime ~80%, and providing valuable insights in both selecting well-matched BH materials and optimizing device structure.