Specific features of photoluminescence properties of copper-doped cadmium selenide quantum dots
- Moscow State University, Faculty of Chemistry (Russian Federation)
- Moscow State University, Faculty of Physics (Russian Federation)
The effect of doping with copper on the photoluminescence properties of cadmium selenide quantum dots 4 nm in dimension is studied. The quenching of the excitonic photoluminescence band related to the quantum dots and the appearance of an impurity photoluminescence band in the near-infrared region are observed after doping of the quantum dots with copper. It is established that, on doping of the quantum dots, the photoluminescence kinetics undergoes substantial changes. The photoluminescence kinetics of the undoped quantum dots is adequately described by a sum of exponential relaxation relations, whereas the photoluminescence kinetics experimentally observed in the region of the impurity band of the copper-doped samples follows stretched exponential decay, with the average lifetimes 0.3-0.6 {mu}s at the photon energies in the range of 1.47-1.82 eV. The experimentally observed changes in the photoluminescence properties are attributed to transformation of radiative centers in the quantum dots when doped with copper atoms.
- OSTI ID:
- 22004738
- Journal Information:
- Semiconductors, Vol. 45, Issue 9; Other Information: Copyright (c) 2011 Pleiades Publishing, Ltd.; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7826
- Country of Publication:
- United States
- Language:
- English
Similar Records
Effect of cadmium-selenide quantum dots on the conductivity and photoconductivity of nanocrystalline indium oxide
Photoluminescence dynamics of direct and indirect excitons in CdTe/ZnTe superlattices with quantum dot layers