In Situ Fabricated Perovskite Nanocrystals: A Revolution in Optical Materials

Abstract After over 30 years of development, colloidal quantum dots have now become mature luminescent materials in photonic and optoelectronic operations and start to hit the market. The emerging perovskite nanocrystals are expected to promote large‐scale commercialization due to their superior optical properties as well as low cost and easy fabrication. This progress report is focused on the developments of in situ fabricated perovskite nanocrystals with attractive features of excellent superior photoluminescence and electroluminescence performance, as well as the solution processability, easy integration, and scale‐up fabrication. These advantages make them suitable candidates as down‐shifting materials for photonics or emissive component for optoelectronics. Recently, the first television demons using composite films based on in situ fabricated perovskite nanocrystals were demonstrated at CES 2018 exhibition, and the performance of electroluminescence devices based on in situ fabricated perovskite nanocrystals is leading the study. It is believed that the in situ fabricated perovskite nanocrystrals will bring a revolution in the field of optical materials after further developments.