Synthesis, Characterization and Application of CdSeZnS Semiconductor Nanoparticles

• Main Authors: Yu-Xuan Lin, 林鈺璇
• Other Authors: Pi-Tai Chou
• Format: Others
• Language: zh-TW
• Published: 2013
• Online Access: http://ndltd.ncl.edu.tw/handle/50941020802270972333

碩士 === 國立臺灣大學 === 化學研究所 === 101 === In recent years, nanotechnology has received much attention. When length of the material is less than 100 nanometers (nm), the quantum-confinement effect and unique quantum properties were exhibited. The zero-dimensional semiconductor nanomaterials (quantum dots) have an unique optical properties i.e. high quantum yield and narrow full-width at half-maximum. By a variety of quantum dots composition and size, the responding emission wavelengths of them are different. The light stability of sample shows better performance than conventional phosphors. Herein, the main goal of our study is to focus within two parts as follows. First, the Cd1-xZnxSe1-ySy quantum dots were synthesized via hot-injection approach. The reactants of Cadmium, Selenium, Zinc and Sulfur are being activated and then form metal-complexes, easily to react with following reactant. Then, the reaction maintains at high temperature lasting proper reaction time. After completion of reaction, high brightness CdSeZnS nanoparticles are successfully prepared. With different reacted composition, we can repeatedly obtain blue to red QDs, of which quantum yield (QY) and full width at half maximum (fwhm) of a composition-tunable Cd1-xZnxSe1-ySy quantum dots are up to 70-95% and 30-50 nm, respectively. The diameter of QDs are 7-10 nm. Thus, we attempt to produce large-scale QDs and reduce production cost. Second, the CdSeZnS QDs mixed with thio-modified monomer and then by adding other monomer and photo initiator for the photopolymerization of a thio crosslinker-encapsulated QDs and acrylate derivatives. After above-mentioned reaction, the thermal initiator reasonably replaces photo initiator and can slightly increase the concentration of QDs embedded in the resulting polymer. Finally, their latent potential as packaging materials for solid state light-emitting diode (LED) has preliminarily demonstrated.