Researchers from Seoul National University developed a flexible green OLED device that uses 2D titanium carbide MXene as a flexible and transparent electrode. The display achieved an efficiency of 100 cd/A, comparable to ITO-based devices, while showing good bending stability.

The researchers say that the MXene electrodes are much more flexible than ITO electrodes and this material could hold the key towards highly flexible transparent conductive display electrodes.

MXenes, a new class of two-dimensional materials discovered at Drexel University in 2011, consist of few-atoms-thick layers of transition metal carbides or nitrides. They have shown impressive properties such as metal-like electrical conductivity and tunable surface and electronic properties.

Conventional MXene films do not meet the requirements of work function and conductivity required in displays and PV applications and degrade when exposed to acidic water-based hole injection layer (HIL). This new research tuned the MXene film to achieve a high work function using low-temperature vacuum annealing. The also design the HIL to be pH-neutral and be diluted with alcohol.

Atomic Force Microscopy for next-gen OLED processesAtomic Force Microscopy for next-gen OLED processes