High Quality Factor\nin Solution-Processed Inorganic\nMicrocavities Embedding CsPbBr₃ Perovskite Nanocrystals

Abstract

Optical microcavities\ngrant manipulation over light–matter\ninteractions and light propagation, enabling the fabrication of foundational\noptical and optoelectronic components. However, the materials used\nfor high-performing systems, mostly bulk inorganics, are typically\ncostly, and their processing is hardly scalable. In this work, we\npresent an alternative way to fabricate planar optical resonators\nvia solely solution processing while approaching the performances\nof conventional systems. Here, we couple fully solution-processed\nhigh dielectric contrast inorganic Bragg mirrors obtained by sol–gel\ndeposition with the remarkable photoluminescence properties of CsPbBr₃ perovskite nanocrystals. The approach yields microcavities\nwith a quality factor of ∼220, which is a record value for\nsolution-processed inorganic structures, and a strong emission redistribution\nresulting in a 3-fold directional intensity enhancement.