The University of Durham has made a significant breakthrough in OLED technology that could lead to brighter, more efficient and longer-lasting blue light-emitting diodes. Researchers at the university have discovered a new approach to OLED displays that utilizes “hyperfluorescent” molecules, which offer more stable and efficient blue emission than previously thought possible.
The researchers successfully transferred energy from a ‘sensitizer’ molecule to a separate ’emitter’ molecule, resulting in highly effective hyperfluorescent OLEDs. Previously dismissed molecules were found to be particularly effective when used as sensitizers in these OLEDs. Specifically, the molecule ACRSA was found to significantly improve OLED efficiency when used as a sensitizer in hyperfluorescence OLEDs due to its rigid molecular structure and long-lived excited states.
By using a greenish sensitizer like ACRSA, deep blue light emission can be achieved by transferring its energy to a blue terminal emitter. This approach reduces exciton energy compared to direct blue emission, resulting in more stable and longer-lasting blue OLEDs.
This new strategy identified by the researchers provides a new molecular design paradigm for stable and highly efficient displays, which could lead to significant reductions in electricity consumption for future display technologies. The researchers at Durham University plan to further develop hyperfluorescent OLEDs with industrial partners for commercial applications.