Synthesis and luminescence of CdS quantum dots capped with a silica precursor

2019-07-18 09:14:59

MPS particle synthesis CdS luminescence

责任者: Wuister, Sander F.;Meijerink, Andries 单位: Phys./Chemistry of Condensed Matter, Debye Institute, Utrecht University, Utrecht, TA 3508, Netherlands 来源出处: Journal of Luminescence,2003,105(1):35-43 摘要: A novel synthesis method for efficiently luminescing CdS nanocrystals is reported using (3-mercaptopropyl)-trimethoxysilane (MPS) as a capping agent in THF or MeOH. The synthesis yields particles capped with a precursor for coating the particle with a silica shell and offers control over a wide range of particle sizes (2-6 nm) by varying the MPS concentration. The temperature dependence of the luminescence and the luminescence life time was studied and explained in terms of a donor-acceptor recombination process in which both electron and hole are trapped at low temperature. In addition to varying the emission color by controlling the particle size, nanocrystals were doped with Zn or Cu resulting in a blue shift or a red shift of the emission. © 2003 Elsevier B.V. All rights reserved. 关键词: Luminescence;Semiconductor quantum dots;Synthesis (chemical);Nanostructured materials;Electron traps;Precursors