The Study of Silica Coated Perovskite Quantum Dot Emission Film and Diffractive Particles

• Main Authors: Jer-Shiun Yang, 楊哲勛
• Other Authors: Chia-Hua Chan
• Format: Others
• Language: zh-TW
• Published: 2019
• Online Access: http://ndltd.ncl.edu.tw/handle/ddxdgs

碩士 === 國立中央大學 === 機械工程學系 === 107 === In this paper, we use solvent supersaturation method in atmosphere to synthesize a fully inorganic perovskite quantum dot with high luminosity; and use APTES as a ligand to replace the organic long chain molecule. By replacing the ligand, we can prevent organic long chain molecules remain on the surface of device and can improve the characteristics of the device. Due to using APTES as ligand to synthesize perovskite quantum dots, we can coat silica on the surface of quantum dot as protection layer by utilize the characteristics of APTES. The protective layer can effectively prevent the quantum dots from being affected by environmental issues. In this study, we tried to find the best PLQY by trying different Pb and APTES molar ratios. We found that when the Pb and APTES molar ratio is 1:1.5, there will have the best result of PLQY 58%. In addition, by utilizing the characteristics of organic silane, we can combine quantum dot and silica nanospheres together. The silica-coated perovskite quantum dots can attach to the surface of nanospheres. Due to the optical properties of the nanospheres, we can cause UV-light scattered and increase the opportunity for quantum dots on the sphere surface to absorb photons. We add different weights of nanospheres into the solvent which contain quantum dots to find the best result. When quantum dots and nano sphere have weight ratio at 1:2.17 can form diffractive particles(DP) with high PLQY 81%. Greatly improve the luminous efficiency of quantum dots. The self-synthesized diffractive particles can be combined with polymethyl methacrylate(PMMA) to make perovskite quantum dots diffusion film. The film made by this method may be a potential candidate of next generation color filter.