Luminescence dynamics of Te doped CdS quantum dots at different doping levels.
We have examined steady-state and time-resolved luminescence properties of CdS:Te quantum dots (QDs). The transient emission spectra have a red shift along the emission process. Using singular value decomposition and multiexponential decay analysis, the luminescence is found to originate from two distinct and parallel channels: band-edge excitonic emission and trapping state emission. With increasing amount of Te, the emission peaks of the QDs show an obvious red shift. Our experimental results suggest that CdS:Te quantum dots have tunable emission spectra and luminescence lifetimes which may have applications in chemical sensing, high throughput screening and other biotechnological applications.
School of Mechanical Engineering, Birck Nanotechnology Center, Purdue University, West Lafayette, IN 47907-2088, USA.
Wenzhi
W
Wu
Hongan
H
Ye
Xiulin
X
Ruan