Improved Luminescence Properties and Thermal Stability of ZnS Quantum Dots by Organic and Inorganic Passivation

• 来源期刊: 中国物理快报（英文版）
• 学科: 物理学
• 年，卷（期）: 2002,（7）
• 页码范围: 967-969
• 页数: 3页
• 分类号: O4
• 语种: 英文

摘要

ZnS quantum dots (QDs) synthesized in water and ethanol solutions were coated with polystyrene (PS) and SiO2shells, respectively. The band edge emission was enhanced by nearly five times after PS coating and by aboutthirteen times after SiO2 coating, because the surface trap states were removed. From the photoluminescenceproperties of ZnS QDs coated with PS and SiO2 shells we have detected the improvement of thermal stability.This is due to the fact that the surface passivation can prevent the further growth of the ZnS QDs and thediffusion of oxygen on the surface of ZnS QDs during thermal oxidation.