Researchers Fabricate Large-Area Sky-Blue PeLEDs

The research group led by Prof. XIAO Zhengguo from the University of Science and Technology of China (USTC) of the Chinese Academy of Sciences prepared large-area and efficient sky-blue perovskite light-emitting diodes (PeLEDs) by blade-coating supersaturated perovskite solution. This work was published in Advanced Materials. Metal halide PeLEDs can achieve high luminance at low voltage due to their high electrical conductivity, making them ideal for the next generation of energy-saving lighting. The external quantum efficiency (EQE) of red/infrared and green PeLEDs is high at present. Blue/sky-blue PeLEDs are essential for white lighting, while the EQE of blue light is relatively low. This is because the crystallization process of blue/sky-blue perovskite film is difficult to control, which results in poor film quality. Till now, there are no reports on the formation of large-area blue/sky-blue PeLEDs.