Synthesis, Coating, and Application of a Novel Cadmium-Free Red Perovskite Quantum Dot for Micro Led Technology

Abstract

This study successfully creats cadmium-free red perovskite QDs through a chemical solution method. The CsPb(Br0.2/I0.8)3 QDs were synthesized by adjusting the bromine-to-iodine ratio and was customized for red emission wavelengths. The QDs were coated with silicon dioxide (SiO2) using a sol-gel method to protect their luminescent characteristics from moisture and oxygen and enhancing interface modification. Finally, pixelated red perovskite QDs were applied to a blue light display as a color conversion layer. The excess blue light penetration was addressed using a 23-layer distributed Bragg reflector (DBR), which redirected surplus blue light back to the QDs, amplifying red light by 30% with a reduced blue light penetration rate of 0.5%. Future research may involve achieving a regionally colored display by precisely aligning and bonding pixelated perovskite QDs, processed for red and previously studied green quantum dots, onto a pre-prepared blue light display.

Keywords: Perovskite Quantum Dot, Micro-LED display, Photolithography process, Distributed Bragg Reflector, SiO2