Influence of 3D aggregation on the photoluminescence dynamics of CdSe quantum dot films
| Autor: | Pedro M. R. Paulo, Emilio Garcia-Fernandez, M. Mercedes Velázquez, T. Alejo, Sílvia M. B. Costa, M.D. Merchán |
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| Rok vydání: | 2017 |
| Předmět: |
Ammonium bromide
Materials science Photoluminescence Biophysics Analytical chemistry 02 engineering and technology 010402 general chemistry 01 natural sciences Biochemistry chemistry.chemical_compound Pulmonary surfactant Phenomenological model Thin film business.industry General Chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics 0104 chemical sciences Semiconductor chemistry Chemical engineering Quantum dot 0210 nano-technology business Luminescence |
| Zdroj: | Journal of Luminescence. 183:113-120 |
| ISSN: | 0022-2313 |
| Popis: | Thin films of semiconductor CdSe quantum dots, QDs, directly deposited onto quartz as well as onto a Langmuir-Blodgett film of the Gemini surfactant ethyl-bis (dimethyl octadecyl ammonium bromide have been prepared and their photoluminescence properties were characterized by confocal fluorescence lifetime microscopy. 3D aggregates of QDs were observed in QD films directly deposited onto the solid while the Gemini surfactant film avoids the 3D aggregation. The photoluminescence decay analysis was performed by a phenomenological model previously proposed by us which considers that the luminescence dynamics is affected by energy transport and trapping processes and the relative contribution of these processes depends on film morphology. Thus, in the non-aggregated and more homogeneous QD films, QDs deposited onto the surfactant, the relative contribution of the energy transport process increases with trap concentration while 3D aggregation favors the energy transport even at low density of energy traps. |
| Databáze: | OpenAIRE |
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