ZnS:Cu^(2+)(1%)Cd^(2+)(x%)量子点的制备及光学性质研究

Synthesis and optical properties of the ZnS:Cu^(2+)(1%)Cd^(2+)(x%) quantum dots

利用水热法制备纤锌矿结构Zn0. 99-xCu0. 01CdxS量子点.实验结果表明:Cu^(2+)和Cd^(2+)均取代了Zn2+的位置掺入到Zn S的晶格中,且其尺寸约为(4. 0±1. 0) nm. Zn S:Cu^(2+)(1%) Cd^(2+)(x%)量子点光学性质研究表明,量子点具有来自于Cu^(2+)离子3d轨道以及深能级Cd^(2+)空位的跃迁发射峰,且随着Cd^(2+)离子掺杂浓度的增加其发光强度降低.这可能因为随着Cd^(2+)掺杂浓度的增加,缺陷中心增加,非辐射复合过程增加,致使发射峰强度降低.

The wurtzite-type Cd/Cu co-doped ZnS quantum dots （QDs） were prepared by a simple hydrothermal method at 180 ℃ without any surface-active agent. The results showed that both the Cd2＋ and Cu2＋ ions were incorporated into the ZnS host and the average diameter of the QDs were （4.0 ± 1.0） nm. Alter adding Cd2＋ ions into the ZnS：Cu2＋ （ 1% ） QDs, the broad emission in the range of 565--600 nm was clue to the transition from conduction band to the Cu-d states;the broad emission in the range of 635--675 nm was clue to the cadmium vacancies. As the Cd2＋ doped ratio increased, the concentration quenching effect could be obsmwed for all the peaks.