Band gap engineering of quaternary-alloyed ZnCdSSe quantum dots via a facile phosphine-free colloidal method.
We demonstrate the synthesis of quaternary-alloyed Zn(x)Cd(1-x)S(y)Se(1-y) quantum dots (ZnCdSSe QQDs) across the entire composition range (x, y) = 0 to 1 with a size tunable from 4.0 to 10.0 nm by a facile, "green", phosphine-free, low-cost colloidal method. The ZnCdSSe QQDs have both composition- and size-dependent band gaps, which can be hybrid-engineered to span the entire visible spectrum. The new ZnCdSSe QQDs are easy to synthesize and have high quantum yields (up to 65%) without the necessity of overcoating a shell. These new quantum dots may find broad uses in biolabeling, biosensing, light-emitting diodes, and other nanodevice applications.
Deng
Zhengtao
Z
The Biodesign Institute and Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona 85287, USA. Zhengtao.Deng@asu.edu
Yan
Hao
H
Liu
Yan
Y
D002104:Cadmium / Q000737:chemistry*; D003102:Colloids / Q000138:chemical synthesis / Q000737:chemistry; D010316:Particle Size; D045663:Quantum Dots; D012643:Selenium / Q000737:chemistry*; D012666:Semiconductors; D013440:Sulfides / Q000737:chemistry*; D013499:Surface Properties; D015032:Zinc / Q000737:chemistry*
D003102:Colloids; D013440:Sulfides; D002104:Cadmium; D012643:Selenium; D015032:Zinc