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- Cadmium-free Quantum Dots
It is well known that cadmium-based quantum dots will hinder their eventual research transformation and commercialization due to the inherent toxicity of cadmium. Therefore, less toxic semiconductor quantum dots, such as CuInS2/ZnS and transition metal (Mn, Cu) doped, have gained increasing attention. The luminescence size and composition of these cadmium-free quantum dots are adjustable, and the luminescence efficiency can reach 70-85%, which is suitable for illumination and display and have good application prospects in solar cells, biological detection and imaging.
Fig.1 Photoluminescence spectra of CuInS2/ZnS quantum dots with different sizes
Due to avoiding the negative effects of heavy metal cadmium, cadmium-free green environmental protection quantum dots with good luminescence efficiency and stability have been applied to display and biological imaging.
Fig.2 Quantum dot display
Fig.3 In vivo fluorescence imaging of the nude mouse bearing a sub-cutaneous tumor [1]
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