Researchers from Korea's KAIST and ETRI institute developed a new metal oxide charge transfer complex that, when dispersed in the OLED stack, can improve the OLED efficiency.
The researchers have applied this material to a green and blue OLED device. The current efficiency of the green OLED was enhanced by 189%, while the external quantum efficiency of the blue OLED was improved by 17%.
The researchers used a material made from nickel oxide and molybdenum oxide nanoparticles, specifically a NiO:MoO3-complex, made from few-nm-size MoO3 domains embedded in NiO matrices. This results in a highly tunable carrier injection material. Dispersing this material improves the electroconductivity in the OLED device.