Widely Tunable Emissions of Colloidal ZnxCd1-xSe Alloy Quantum Dots Using a Constant Zn/Cd Precursor Ratio
- Widely Tunable Emissions of Colloidal ZnxCd1-xSe Alloy Quantum Dots Using a Constant Zn/Cd Precursor Ratio
- 김종욱; 이종진; 장호성; 전덕영; 양희선
- ZnxCd1-xSe; quantum dots; luminescence; Tunable Emissions; Constant Precursor Ratio
- Issue Date
- Journal of nanoscience and nanotechnology
- VOL 11, NO 1, 725-729
- The widely tunable emissions of ZnxCd1−xSe alloy quantum dots (QDs), which emit green to red
wavelengths from 534 to 620 nm, are reported. Green-, yellow-, orange-, and red-emitting QDs
were synthesized by varying a point of time for oleylamine (as a co-surfactant) addition and a Se
precursor amount, and keeping a constant Zn/Cd precursor ratio. With reaction time the alloying and
particle growth of the alloy QDs progressed simultaneously in the opposite direction in the variation
of their band gap. However, the band gap energies of all QDs were observed to be gradually blueshifted
due to the slight dominance of alloying over the particle growth effect. The compositions
of alloy QDs were estimated based on their sizes and band gap energies. ZnxCd1−xSe core QDs
were also overcoated with a ZnSe shell with a higher band gap to enhance their quantum yields.
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