Probing the exciton density of states in semiconductor nanocrystals using integrated photoluminiscence spectroscopy
| Autor: | Anabela G. Rolo, Dmitrii V. Talapin, Mikhail Vasilevskiy, Mikhail Artemyev, M. J. M. Gomes, Yury P. Rakovich, S. A. Filonovich, Andrey L. Rogach |
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| Přispěvatelé: | Universidade do Minho |
| Jazyk: | angličtina |
| Rok vydání: | 2002 |
| Předmět: |
Photoluminescence
Nanostructure Absorption spectroscopy Exciton 02 engineering and technology 010402 general chemistry 01 natural sciences CdSe Absorption Condensed Matter::Materials Science Ultraviolet visible spectroscopy Photoluminescence excitation UV/Vis spectroscopy Absorption (electromagnetic radiation) Spectroscopy Computer Science::Data Structures and Algorithms Science & Technology business.industry Chemistry Condensed Matter::Other General Chemistry Semiconductor CdTe 021001 nanoscience & nanotechnology Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 0104 chemical sciences Nanocrystals Nanostmcture CdSe/ZnS core-shell nanocrystals Optoelectronics business 0210 nano-technology |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP Nanostructured Materials ISBN: 9783709173985 |
| Popis: | We present the results of a comparative analysis of the absorption and photoluminescence excitation (PLE) spectra vs. integrated photoluminescence (IPL) measured as a function of the excitation wavelength for a number of samples containing II–VI semiconductor nanocrystals (NCs) produced by different techniques. The structure of the absorption and PL spectra due to excitons confined in NCs and difficulties with the correct interpretation of the transmittance and PLE results are discussed. It is shown that, compared to the conventional PLE, the IPL intensity plotted against the excitation wavelength (IPLE spectra) reproduce better the structure of the absorption spectra. Therefore, IPLE spectroscopy can be successfully used for probing the quantized electron-hole (e-h) transitions in semiconductor nanocrystals. Fundação para a Ciência e Tecnologia (FCT, Portugal) through project PRAXIS/C/FIS/10128/1998 Project SFB508 (Germany) YPR and SAF wish to acknowledge fellowships from PRAXIS XXI (FCT). |
| Databáze: | OpenAIRE |
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