Preparation of Quantum Dots by Ultrasound-assisted Beads Milling Method

Abstract

Perovskite quantum dots have excellent luminescence properties and are expected to be used as phosphors for wide color gamut displays. However, the development of an industrially practical synthesis method for quantum dots remains challenges. Although a proven pulverization method is promising for the synthesis of fine particles, it is difficult to achieve monodispersion of quantum dots due to aggregation and fusion of particles during the pulverization process. In this study, we apply the “ultrasound bead milling method,” which is a combination of “ultrasound” and “bead milling” originally devised by the authors. Ultrasound irradiation suppresses aggregation and fusion of the particles, allowing the particles to be milled while maintaining their dispersed state. This enables the synthesis of size monodisperse perovskite quantum dots, which can be further developed into light-emitting devices. In this study, the high superiority of the ultrasound bead milling was clarified by improving optical properties by evaluating the milling conditions, clarifying the milling mechanism through simulation, and fabricating and evaluating luminescent devices in a consistent manner.