Researchers from the University of Michigan have identified nanoscale hotspots in OLED devices that may limit their operational lifetimes.
In amorphous organic materials, charge carriers travel through uneven energy landscapes, forming concentrated “rivers” of current. Where these pathways intersect, localized hotspots of light emission are created, some of which flicker due to temporarily trapped charges.
These high-current regions may degrade faster over time, reducing overall device stability. The team suggests that crystalline materials, with more uniform energy landscapes, could enable more even charge transport and longer-lasting OLED performance.
