光学性能对粒子尺寸的依赖性是量子点独特的和最具吸引力的功能。例如，通过控制粒子的大小，CdSe量子点的发射光波长在整个可见光范围内连续可调。然而，二元素量子点，如CdSe量子点，有两个缺点。，其表面缺陷形成表面陷阱态，使发光效率和稳定性降低。通过在量子点表面包附ZnS，形成Core-shell结构可以降低面缺陷，但CdSe和ZnS晶格失配，在很大程度上影响其发光效率和光学稳定性。第二，量子点的消光系数同粒子的体积成正比例关系。标记6nm（红光）CdSe量子点的物质发射光强度是2nm（绿光）量子点的三十倍，这会引起检测灵敏度的差异。
不同于二元素量子点，星烁纳米研发的梯度合金CdS/ZnS量子点， 在发光核和ZnS壳中加入三元合金过渡组分，因而带来了以下几个优点：
1、通过调整合金元素组成控制其光学性能，制备体积一致但发光频率不同的量子点，从而降低由于应用不同颜色量子点引起的检测灵敏度上的差异；
2、合金量子点晶格力度强，性能稳定；
3、实现晶格的逐步过渡，有效降低量子点晶格缺陷造成的内部压力，从而使量子点具有较高的发光效率和稳定性。
Size-dependent fluorescence property is probably the most unique and attractive feature of QDs. For instance, through controlling the particle size from 2-6 nm, the emission from CdSe QDs can be continuously tuned to from green to red that covers entire visible wavelength range. However, there are two issues associated with the fabrication and application of binary QDs such as CdSe. First, the formation of defects and surface-trap states results in the low luminescence efficiency and stability deficits. Although this problem can be minimized through nanocrystal surface-passivation with high bandgap inorganic material such as the most commonly used ZnS, the largely lattice mismatch between the core nanocrystal and passivation shell layer usually degrade the optical properties. Second, the extinction coefficient of QDs is also size-dependent – proportional to the volume of the particle. This means species labeled with 6 nm CdSe QDs will emit red light that is ~30 times stronger than the green light from a species that labeled with 2 nm green emitting QDs.
Unlike binary QDs, the GA_CdS/ZnS QDs we developed are tuned to have different emissions by changing their composition in both CdS core and ZnS shells. This allows the preparation of GA QDs with the approximately the same particle sizes (hence the same absorption and emission intensity) but different emission wavelength. Subsequently, this will enable the measurement of each of the species with the equal sensitivity. Our GA_QDs possess higher and more stable PL emission due to larger particle size, higher crystalline, hardened lattice structure, lower inter-diffusion, and spatial compositional fluctuation.
技术参数 Technical Specifications
发射峰 Emission Peak：
400-460 nm
量子产率 Quantum Yield：
50-90%
表面基团 Surface Group：
十八胺（或客户指定配体）Octadecylamine (or customer required ligands)
溶剂 Solvent：
甲苯（或客户指定溶剂）Toluene (or customer required solvents)
关键字： CdS/ZnS量子点 CdS/ZnS QDs
苏州星烁纳米科技有限公司是一家中美合资企业，2012年成立于世界上最大的纳米技术产业综合社区——苏州纳米城（www.nanopolis.cn），公司专注于荧光纳米粒子（量子点）的研发和产业化生产。我们为客户提供精益求精的量子点以及相关服务。
以美国分公司Mesolight Inc. (www.mesolight.com) 的多年研发成果为基础，星烁纳米拥有国际领先的量子点技术，其中包括：梯度合金量子点，无镉环保量子点，上转换量子点，量子点/高分子复合材料，量子点发光二极管，和闪烁量子点的制备，以及量子点在高清显示器，光电子器件，太阳能电池，荧光生物成像，核辐射成像，防伪涂层等多项领域的应用。
星烁纳米研发的系列量子点具有发光效率高，制造成本