Laser In Situ Synthesis of Wide Bandgap Tunable Perovskite and Its Application in Micro‐LEDs

Abstract Laser patterning of perovskite is a novel technology with the advantages of high speed, programmability, and maskless, which is ideal for fabricating micro light‐emitting diodes (micro‐LED) color conversion layers (CCL). This work reports a method for laser in situ synthesis of wide bandgap tunable perovskite with an emission spectrum from 475 to 667 nm. Based on the photonic effect of continuous wave (CW) laser and the thermal quenching phenomenon of perovskite, ultra‐high precision patterning with a minimum linewidth of 750 nm and a maximum dot‐pixel per inch (PPI) of 5684 is achieved. More importantly, significant improvements in perovskite stability and integration of red‐green dual‐color dot arrays are achieved through in‐depth studies of polymer matrices and precursor solvents. The red‐green dual‐color integrated dot arrays using blue micro‐LED chips, which is a great impetus to the research of micro‐LED full‐color displays, are also successfully excited.