123rd General Meeting of the KCS

Type Poster Presentation
Area Material Chemistry
Room No. Exhibition Hall 2
Time 4월 19일 (금요일) 11:00~12:30
Code MAT.P-472
Subject Fabrication and Characterization of CsPbBr3@SiO2 Perovskite Quantum-Dot Composites for ink-jet Printed Color Conversion Layer
Authors Sang-Yoon Lee, Sol Choi, Jun Choi*
Human Convergence Technology Group, Korea Institute of Industrial Technology, Korea
Abstract Inorganic cesium lead halide perovskites (CsPbX3, X = Cl, Br, I) have attracted enormous attention as a novel optoelectronic material with enhanced stability compared to the other perovskite materials. However, CsPbX3 perovskite quantum-dot still contains the defects that the oxygen and moisture affect their stability and luminescence performance. Therefore, we have synthesized CsPbBr3 quantum-dot/silica composites by applying silica for highly stable core-shell structures. The silica effectively passivated the perovskite quantum-dot composite surface, so it was able to maintain original high photoluminescence quantum yield in the air. We used low-speed centrifuged solution after the synthesizing process to make the printable inks. By using proper ink formulation recipe, we were able to set the suitable physical and rheological properties(viscosity, ink conductivity) of the inks for ink-jet printing process. We analyzed FT-IR, TEM image, XRD, optical properties, and color coordinates of the synthesized CsPbBr3@SiO2 particles and inks to verify their characters. The prepared CsPbBr3 quantum-dot inks were ink jet printed, and formed the coated thin film which could be used as the color conversion layer of LED display. The prepared CsPbBr3 quantum-dot inks and coated thin films exhibited excellent ambient stability and photoluminescence quantum yield with the efficient green emission.
E-mail sangyoon@kitech.re.kr