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Quantum Dots is a kind of semiconduct nanopatical(or nanopowder or nanocluster or nanocrystal) with quantum property.It is made from two or more semiconduct materials in II-IV elements with core-shell structure or colloidal structure.Its size can be as small as 2 to 10 nanometers,corresponding to 10 to 50 atoms in diameter and a total of 100 to 100,000 atoms within the quantum dot volume.
CdS, ZnSe,CdSe/ZnS,CdTe/ZnS and CdSeTe/ZnS are most typically Quantum Dots.
Due to its quantum property, the quantum dots excited by exterior energy can emit light from blue to near infrared(400-850nm) depending on size.
As excitable fluoresence materials,QDs has some outstanding characteristics as compared with organic dye. A)Higher Quantum yield; B)Emission wavelength can be tuned by size; C)Narrow Full width at half maximum (FWHM) of emission PL spectrum; and D)Excellent photo-oxide resistance.
