Enhancing Luminescent Properties of Vapor-Deposited Perovskite Films Through Vapor Exposure

The industry of perovskite materials has been highly sought out for next generation technology and devices. Perovskite thin films have been used in a large array of applications including light-emitting diodes (LEDs), solar cells, lasers and photodetectors. However, within recent years the widely existing defects (from significant intrinsic point defects to a mass of surface imperfections introduced during the fabrication process) in the metal halide perovskites have limited photoluminescence efficiency and stability.

 

Professor Jian Li at Arizona State University has developed a method to enhance vapor-deposited perovskite films by exposing them to specific organic or air-based vapors that chemically bind and suppress vacancy defects, resulting in highly stable, defect-free films with dramatically improved photoluminescence efficiency. This process utilizes exposure to various organic solvents and controlled air conditions, achieving up to a tenfold increase in light emission efficiency. Additionally, the technology enables the fabrication of full-color OLED displays by integrating doped perovskite films as color converters, reducing reliance on costly manufacturing components like shadow masks and enabling high-resolution, cost-effective display production.

 

This novel and robust approach enables the production of high-quality, defect-free perovskites with excellent photoluminescence efficiency, color purity and long-term stability.

 

Potential Applications

Benefits and Advantages