Fig. 1. TEM images of CdSxSe1-x/ZnS quantum dot in water (sample No.6). (a) Low power; (b) high power

Fig. 2. Size distribution of QD (No.6 sample)

Fig. 3. Spectrogram of No.6 sample

Fig. 4. Absorption spectra of each sample

Fig. 5. PL radiation of each sample at room temperature. (a) PL wavelength of each samples; (b) PL-peaking wavelength varying with QD size

Fig. 6. Effect of temperature on PL radiation. (a) PL spectra at different temperatures of No. 6 sample; (b) PL-peaking wavelength varying with temperature of each samples

Fig. 7. PL-peaking wavelength varying with x

Fig. 8. PL versus time and fitting results. (a) Measured luminescence decay curves of QD; (b) original life data and fitting curve of No. 6 sample

Fig. 9. Fitting results of PL lifetime. (a) Weights ?1 and ?2 of PL lifetime of QD; (b) short lifetime τ1, long lifetime τ2, and average lifetime τ

Fig. 10. PL lifetime varying with size of CdSxSe1-x/ZnS QD

Fig. 11. Effect of element component ratio on PL lifetime. (a) Measured luminescence decay curves for different x values; (b) PL lifetime varying with x

Fig. 12. Effect of temperature on PL lifetime of No. 6 sample. (a) luminescence decay curves of QD at different temperatures; (b) PL lifetime varying with temperature