Room-Temperature, Homogeneous, Single-Step, and Large-Scale Synthesis of Perovskite Nanoplatelets for Blue Light-Emitting Diodes

Abstract

Inorganic perovskite nanocrystals(IPNCs) have attractedconsiderableattention due to their excellent optoelectronic properties. However,problems arise from anion migration during the preparation of a bluelight-emitting diode (LED), and only small-scale syntheses have beenconducted on a laboratory scale. By using only Br as the anion here,CsPbBr3 was synthesized in the form of nanoplatelets toeliminate the effects of anion migration and to prepare an inorganicperovskite nanoplatelet (IPNPL) emitting blue light. In addition,the synthesis was performed under ambient conditions at room temperature,and the synthetic process was shortened to enable large-scale synthesis.We used a 1 L bottle for large-scale synthesis, and a photoluminescencequantum yield (PLQY) of 78% was observed at 460 nm. We fabricatedLEDs by using IPNPLs, and we observed an electroluminescence peakat 461 nm. The developed synthetic method is expected to pave theway for commercialization of IPNCs and the next-generation displaymarket.