Excimer like Photoluminescence Spectra of CdSe/ZnS Quantum Dots
A. Hamdan1, Saradh Prasad1, M. S. Alsalhi1, V. Masilamani1,
M. R. Karim 2, K. H. Ibnaouf3,
and
M. B. Zaman4
1. Research Chair for Laser Diagnosis of Cancer, King Saud University. Riyadh, KSA
2. CEREM, College of Engineering - King Saud University. King Saud University. Riyadh, KSA
3. Physics Department, Al-Imam Muhammad Ibn Saud Islamic University, Riyadh, KSA
4. Advanced Medical Research Institute of Canada, Sudbury, Canada
2. CEREM, College of Engineering - King Saud University. King Saud University. Riyadh, KSA
3. Physics Department, Al-Imam Muhammad Ibn Saud Islamic University, Riyadh, KSA
4. Advanced Medical Research Institute of Canada, Sudbury, Canada
Abstract—The spectral properties of CdSe/ZnS core-shell quantum dots (QDs) have been studied under different organic solvents, concentrations and temperatures. Our results showed that the absorption spectra of CdSe/ZnS in benzene have only one peak around 280 nm under wide range of concentrations, and the shape of the absorption remained unchanged. On the other hand, the photoluminescence (PL) spectra of CdSe/ZnS in benzene showed two peaks one around 375nm and the other around 550nm. The effects of concentration and the temperature on CdSe/ZnS in benzene, under same conditions, were studied. The photoluminescence at 550nm became increasingly stronger for higher concentration and lower temperature. These are analogues to the excimeric behavior of organic molecules. To the best of our knowledge, this is the first report with convincing evidences for the excimer – like behavior of CdSe/ZnS core/shell QDs.
Index Terms—photoluminescence spectra, quantum dots, excimer, solvent influence
Cite: A. Hamdan, Saradh Prasad, M. S. Alsalhi, V. Masilamani, M. R. Karim, K. H. Ibnaouf, and M. B. Zaman, "Excimer like Photoluminescence Spectra of CdSe/ZnS Quantum Dots," Lecture Notes on Photonics and Optoelectronics, Vol.1, No.1, pp.18-22, June 2013. doi: 10.12720/lnpo.1.1.18-22
Index Terms—photoluminescence spectra, quantum dots, excimer, solvent influence
Cite: A. Hamdan, Saradh Prasad, M. S. Alsalhi, V. Masilamani, M. R. Karim, K. H. Ibnaouf, and M. B. Zaman, "Excimer like Photoluminescence Spectra of CdSe/ZnS Quantum Dots," Lecture Notes on Photonics and Optoelectronics, Vol.1, No.1, pp.18-22, June 2013. doi: 10.12720/lnpo.1.1.18-22
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