Durham University Research Findings to Make Display Technologies Brighter, More Efficient, and More Stable
A new research from scientists at Durham University has uncovered an unexpected pathway towards brighter, more efficient, and more stable blue organic light-emitting diodes (OLEDs). The findings, published in the journal Nature Photonics, could contribute to the next generation of energy-saving display technologies.
OLEDs used in most modern smartphones and TVs rely on light emission from specialized organic molecules. However, obtaining stable, efficient blue emission suitable for displays is a significant challenge. To address this, Durham University researchers have unlocked a new design strategy using “hyperfluorescent” OLEDs, where energy is transferred from a ‘sensitizer’ molecule to a separate ‘emitter’ molecule.
Surprisingly, the team found that sensitizer molecules previously dismissed as poor emitters actually perform remarkably well in hyperfluorescent OLEDs. Particularly, the molecule ACRSA was found to triple the OLED efficiency when used as a sensitizer in hyperfluorescence OLEDs.
The researchers attribute this to ACRSA’s rigid molecular structure and long-lived excited states. Additionally, using a greenish sensitizer like ACRSA, deep blue light emission can be achieved by transferring ACRSA’s energy to a blue terminal emitter. This approach reduces exciton energy compared to direct blue emission in devices, allowing more stable, longer-lasting blue OLEDs.
Overall, the strategy provides a new molecular design paradigm for stable and highly efficient displays. The findings have revealed unexplored territory for hyperfluorescent OLEDs that could significantly increase material choices for the next generation of displays. The researchers plan to further develop hyperfluorescent OLEDs, with industrial partners, for commercial applications. The new OLEDs are also expected to consume up to 30% less electricity.