Asymmetry is key to stable blue perovskite LEDs

The study, conducted at Okinawa Institute of Science and Technology Graduate University (OIST) and published in the Journal of the American Chemical Society, could bring perovskite LEDs one step closer to commercialisation.

“Perovskites have the potential to be a real game-changer in the lighting industry,” said first author Dr. Yuqiang Liu, a former post-doctoral researcher in the OIST Energy Materials and Surface Sciences Unit and currently a professor at Qingdao University, China. “In only a few short years, the efficiency of perovskite LEDs – how well they can transfer electrical energy into light energy – has shot up to a level that rivals traditional LEDs, and soon will surpass them.”

Perovskite LEDs also have the potential to produce brighter, purer colours at a fraction of the production cost.

However, the stability of perovskite LEDs remains a huge barrier, with the operational lifetime of even the most stable LEDs lasting only a few hundred hours. Blue LEDs have lagged behind red and green-coloured LEDs with a lifetime of under two hours and around half the level of efficiency.