Up-Conversion Luminescence in Colloidal CdTe Nanocrystals
| Autor: | M. J. M. Gomes, Alexander Eychmüller, Andrey L. Rogach, Dmitri V. Talapin, John F. Donegan, Nikolai Gaponik, Yury P. Rakovich, S. A. Filonovich |
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| Rok vydání: | 2002 |
| Předmět: |
Photoluminescence
Materials science business.industry 02 engineering and technology Photon energy 021001 nanoscience & nanotechnology 01 natural sciences Molecular physics Auger Colloid Nanocrystal 0103 physical sciences Optoelectronics 010306 general physics 0210 nano-technology business Luminescence Absorption (electromagnetic radiation) Excitation |
| Zdroj: | MRS Proceedings. 737 |
| ISSN: | 1946-4274 0272-9172 |
| DOI: | 10.1557/proc-737-e13.12 |
| Popis: | We report on the efficient photoluminescence up-conversion in colloidally synthesized CdTe nanocrystals. We demonstrate that the efficiency of photon energy up-conversion and magnitude of spectral shift can be controlled: (i) by the size of the nanocrystals; (ii) by the temperature dependence of the excited state absorption coefficient; (iii) by the dependence on excitation intensity. From the analysis of the experimental data we can suggest that intrinsic gap states are involved as intermediate states in the photoluminescence up-conversion rather than nonlinear two-photon absorption or Auger processes. |
| Databáze: | OpenAIRE |
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