Efficient near-infrared (NIR) light-emitting diodes of perovskite have been produced in a laboratory at Linköping University.
The results have been published in Nature Photonics.
The work is led by LiU scientist Feng Gao, in close collaboration with colleagues in China, Italy, Singapore and Switzerland.
The external quantum efficiency (the ratio of charge carriers emitted as light over all of those fed into the materials) of light-emitting diodes based on perovskites has until now been limited by defects that arise in the material during manufacture.
This allowed us to search for a molecule that was perfect for passivation", says Feng Gao, senior lecturer in the Division of Biomolecular and Organic Electronics at Linköping University.
The molecule they found has two amino groups at its ends, with oxygen atoms at suitable distances between them.