The hottest perovskite light-emitting diode was bo

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Perovskite led was born! The external quantum efficiency reached a record of 21.6%

a laboratory at Lin Xueping university has produced efficient perovskite near infrared (NIR) light-emitting diodes. The external quantum efficiency is 21.6%, which is a record. The research results published in nature photonics can be installed with different fixtures. This work was led by Liu scientist Feng Gao, who worked closely with colleagues in China, Italy, Singapore and Switzerland

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perovskite is a group determined by its crystal structure. We believe that this is the most interested and sought performance enhancing material in the composite material market. It has been the focus of research in the past 10 years. It was initially used in solar cells, but the new research is also used in light-emitting diodes, which has good light-emitting performance and is easy to manufacture

Boke Park - Science Popularization: so far, the external quantum efficiency (the proportion of carriers emitted in the form of light) based on perovskite light-emitting diodes has been limited by defects in materials during the manufacturing process, which act as traps for carriers, resulting in energy loss. One way to deal with defects is to add materials called "passivating molecules", which are combined with atoms that cause defects. Researchers have previously found a molecule with amino group at the end. This molecule has certain changes in properties. The system uses computers to set experimental items and parameters

the external quantum efficiency of perovskite light-emitting diodes reached a record 21.6%. Picture: Thor balkhed

however, this effect is significantly enhanced when they choose a molecule that also contains oxygen atoms. Feng Gao, senior lecturer in biomolecule and organic electronics at linxueping University, said: we now know that it is the hydrogen bond between passivated molecules and perovskite materials that causes the problem. They found that there are two amino groups at the end of the molecule, and the oxygen atom is at an appropriate distance between them. Oxygen atoms reduce the hydrogen bonding ability of amino groups, thereby increasing the possibility of their interaction with defects. The number of charge carrier traps in perovskite is significantly reduced, so that charge carriers can effectively recombine and emit light

Xu Weidong, a researcher in the laboratory of Lin Xueping University. Picture: Thor balkhed

this special perovskite material provides efficient light-emitting diodes in the near-infrared region. Near infrared light emitting diodes are particularly useful in medical and telecommunications applications. It is believed that the new discovery can also be applied to perovskite light-emitting diodes of other colors. The external quantum efficiency reached a record 21.6%. Xuweidong, a postdoctoral fellow in the Department of biomolecules and organic electronics, said: we have developed the best light-emitting diodes in perovskite materials, which can also compete with light-emitting diodes based on organic materials

Science Park - science popularization | research/from: Lin Xueping University

reference journal literature: this time, the full-color plastic 3D printing material "nature photonics" is launched

doi: 10.1038/s-x

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