Cu掺杂ZnSe高效量子点的合成及其光学特性研究

Synthesis of Effective and Qualified Cu-doped ZnSe Quantum Dots and Their Optical Properties

采用生长掺杂方式制备了Cu掺杂ZnSe高效量子点,探索了不同Zn、Se前驱体配比对ZnSe晶核以及ZnSe:Cu量子点质量的影响,并研究了Cu离子掺杂过程中的光谱特征。研究表明,进一步通过在表面掺杂的ZnSe:Cu量子点上同质包覆ZnSe壳层,能够实现其发光效率和稳定性的有效提高;采用配体交换能够实现ZnSe:Cu量子点由油溶性到水溶性的转变。这种新型的掺杂量子点有望替代传统含Cd量子点应用于环境友好型固体发光器件和生物标记。

Effective Cu-doped ZnSe quantum dots （ZnSe：Cu d-dots） with high qualities were synthesized by a growth-doping strategy. The effect of the ratios of Zn to Se precursor within the raw materials on the quality of the ZnSe cores and ZnSe：Cu d-dots was studied. The photoluminescence （PL） properties of ZnSe：Cu d-dots in Cu doping process were investigated systematically. The results suggested that the optical performance and stability of the d-dots could be remarkably improved by further coated with a homogeneous ZnSe shell on the fabricated surface-doped ZnSe：Cu d-dots. In addition, the obtained ZnSe：Cu d-dots could be changed to be water-soluble by ligand exchange. It implied that these novel d-dots could be a promising candidate to substitute for the conventional quantum dots containing Cd elements, suggesting their potentially environment-friendly applications in the fields of solid state lighting and diagnostics.