abstract |
This invention provides a middle-sized quantum dot, which comprises a single crystal consisted of a formula of Zn0.5-xCdxS0.5-ySey. Said single crystal has a size ranging from 7 nm to 20 nm, wherein 0 < x < 0.2, 0.005 ≤ y < 0.2, and the distribution of Zn, Cd, S, and Se in the single crystal exhibited non-uniformly. |