Simple and Fast Patterning Process by Laser Direct Writing for Perovskite Quantum Dots

Abstract

AbstractFor the application of quantum dots (QDs) on next‐generation displays, it is of significant importance to improve QDs patterning technology. Here, this paper reports a simple and fast approach of perovskite QDs patterning based on laser direct writing (LDW). It is a mask‐free and programmable method, including three steps: spin‐coating perovskite QDs, laser writing, and solvent washing. The LDW patterning on QDs relies on the removal of surfactant around the QDs by laser scanning. Macroscopic QD patterns are composed of many microscale QD lines formed via laser scanning. The width and morphology of QD lines can be controlled by varying LDW parameters, including the laser spot size, scanning speed, and laser energy, which also leads to the variation of QDs brightness. Moreover, a large‐scale (100 mm × 100 mm) patterning is demonstrated by LDW, which implies its great potential for large area display application.