Fluorescence Properties of Cd(OH)_2-activated CdSandCuS-coated CdSNanocry stals

• 作 者: 陈红明 黄信凡 徐岭 何勇 陈坤基
• 出 处: 半导体学报
• 发表日期: 1999年12期
• 关键词: coated Fluorescence

CdS nanocrystals with a mean diameter 5 nm have been prepared by sol|gel method. Fluorescence(FL) properties of CdS nanocrystals modified with two different methods were studied at room temperature. Activation of CdS nanocrystals by a cadmium hydroxide precipitate leads to an enhancement of FL intensity by a factor of 15 compared with the ones without activation . We have firstly chosen CuS as a shell to coat CdS nanocrystals by ion substitution reaction, and the FL of the coated CdS/CuS was also investigated. With the modification of CuS the initial surface defect states of CdS nanocrystals was passivated, which resulted in the appearance of the direct ‘band|edge’ recombination of the electron|hole pair in CdS nanocrystals. PACC:7855, 8265

CdS nanocrystals with a mean diameter of 5 nm have been prepared by sol | gel method. Fluorescence (FL) properties of CdS nanocrystals modified with two different methods were studied at room temperature. Activation of CdS nanocrystals by a cadmium hydroxide precipitate leads to an enhancement of FL intensity by a factor of 15 compared with the ones without activation. We have selected chosen CuS as a shell to coat CdS nanocrystals by ion substitution reaction, and the FL of the coated CdS / CuS was also investigated. With the modification of CuS the initial surface defect states of CdS nanocrystals was passivated, which resulted in the appearance of the direct ’band | edge’ recombination of the electron | hole pair in CdS nanocrystals. PACC: 7855, 8265