With the development of nanometer synthesis technology, cadmium-based quantum dots have been widely synthesized. Organic and aqueous synthesis methods are the most widely reported methods. Cadmium based quantum dots have become the most widely studied photoactive materials due to their narrow band gap, high luminous efficiency, absorption of visible light and convenient preparation.
Fig.1 Cadmium-based quantum dots
Cadmium-based quantum dots mainly include CdS, CdSe, CdTe quantum dots and their composites. Due to their unique photoelectric properties and excellent stability, they have been widely used in photoelectric sensors, light-emitting devices and other fields.
- Photoelectric sensor: Cadmium-based quantum dots mainly include CdS, CdSe, CdTe quantum dots and their composites. Due to their unique photoelectric properties and excellent stability, cadmium-based quantum dots have been widely used in optoelectronic biosensors, mainly used in enzyme sensing, immune analysis, DNA detection and cell-related analysis. Photoelectric chemical biosensors developed based on the properties of cadmium-based quantum dots are increasingly playing an important role in clinical and environmental fields because of their remarkable advantages of sensitivity, efficiency and convenience.
Fig.2 Schematic representation of (A) the synthesis of the CdTe/ZnO nanohybrids, and (B) the construction and photoelectrochemical strategy of the DNA biosensor 
- Light emitting devices: Cadmium based quantum dots have the advantages of high fluorescence efficiency, high fluorescence purity and adjustable luminous wavelength in visible region. As a new nanomaterial with unique photoelectric characteristics, it can accurately and efficiently convert high energy blue light into red or green light. Therefore, it is widely used in display devices. For example, oil-soluble CdSe, CdSe/ZnS, CdSe/CdS/ZnS, and CdSe/CdS/ZnS have been applied in the preparation of displays.
Fig.3 Schematic preparation of CdTe/CdS@ZnS−SiO2QDs and their applications in WLEDs .
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- Wang W J.; et al, Quantum dot-functionalized porous ZnO nanosheets as a visible light induced photoelectrochemical platform for DNA detection. Nanoscale, 2014, 6, 2710-2717.
- Li-Hua Mao.; et al, Construction of highly luminescent CdTe/CdS@ZnS−SiO2 quantum dots as conversion materials toward excellent color-rendering white-light-emitting diodes. Industrial & Engineering Chemistry Research, 2014, 53(43): 16763-16770.