Development and design of perovskite LEDs
Researchers from the Department of NMR Spectroscopy (IMC) in cooperation with the Department of Biomolecular and Organic Electronics of the University of Linköping have advanced in the development and design of PeLED diodes.
An international scientific team has described how to significantly improve the operational stability of PeLED diodes by treating a perovskite precursor with dicarboxylic acids. Perovskite-based light emitting diodes (LEDs) are promising candidates for more affordable and high-performance light-emitting diodes. However, scientists have struggled with their poor chemical stability. An international team of researchers has found an active substance that prevents the degradation of the perovskite precursor in PeLED diodes.
The publication recently appeared Joule, a scientific journal focused on solving problems with sustainable energy. Perovskite LED research is one of the scientific topics addressed within the platform of the Academy of Sciences Strategy AV 21, which aims to solve the problems and challenges of today's society.
"We have found that dicarboxylic acids effectively eliminate reactive organic additives in perovskite emission layers to produce stable organic products. These products subsequently prevent further undesired interfacial reactions, which significantly increases the operational stability of the resulting PeLED diodes,” explains Dr. Libor Kobera from the Department of NMR Spectroscopy. "Thanks to the optimization of this reaction in the emission layers of perovskite, we achieved a high efficiency (18.6%) and at the same time a long life of PeLED diodes (682 h)," adds Dr. Jiří Brus, head of the department and coordinator of the AV21 Strategy scientific program "Molecules and Materials for Life".