Prof. Tae-Woo Lee’s group from Pohang University of Science and Technology, Republic of Korea, made significant achievement on perovskite LEDs and published their work on Advanced Materials.
Now days many research group are focusing the organic/inorganic hybrid perovskite materials as a new type of light emitting materials. Methyl ammonium lead bromide (CH3NH3PbBr3, MAPbBr3) is one of the most common materials. Prof. Lee’s group partially substitute the methyl ammonium ion (MA) with phenylethyl ammonium ion (PEA). The ratio of the MA and PEA would affect the crystal structure of the materials and these structures are called quasi-2D perovskite structure. With these materials, they got uniform morphology with small particle size. By substituting the organic ammonium cation, they achived higher luminance and current efficiency perovskite light emitting diodes(PeLEDs) compared to MAPbBr3 PeLEDs. The optimum device showed the highest luminance and current efficiency; 2935 cd m-2 and 4.90 cd A-1, respectively. This work is the first visible PeLEDs based on quasi-2D perovskite materials.