Temperature dependence of photoluminescence from CdSe nanocrystals embedded in silica matrix
| Autor: | Anabela Rolo, Adil Chahboun, Maria de Jesus de Matos Gomes, Sergey Levichev, Olinda Conde |
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| Přispěvatelé: | Universidade do Minho |
| Jazyk: | angličtina |
| Rok vydání: | 2009 |
| Předmět: |
Materials science
Photoluminescence Exciton Biophysics Mineralogy 02 engineering and technology 01 natural sciences 7. Clean energy Biochemistry CdSe Thermal expansion Matrix (mathematics) 0103 physical sciences Thermal 010306 general physics Nanocomposite Science & Technology business.industry General Chemistry Atmospheric temperature range 021001 nanoscience & nanotechnology Condensed Matter Physics Atomic and Molecular Physics and Optics Nanocrystals Nanocrystal Temperature dependence Optoelectronics 0210 nano-technology business |
| Zdroj: | Repositório Científico de Acesso Aberto de Portugal Repositório Científico de Acesso Aberto de Portugal (RCAAP) instacron:RCAAP |
| Popis: | In this work, CdSe nanocrystals (NCs) embedded in SiO(2) matrix were grown by radio frequency (RF)sputtering technique. X-ray technique was used to characterise the structural properties of the system. The NC's size was estimated to be around 4 +/- 1 nm in diameter. The temperature dependence of the photoluminescence from the CdSe/SiO(2) System showed carriers thermal exchange between the NCs and deep defects in the matrix. The evolution of the excitonic energy emission with temperature is about 10 meV in the temperature range 15-295 K. This weak shift was explained by thermal mismatch between the matrix and the NCs. Fundacao para a Ciencia e a Tecnologia (FCT) ‘‘Programa Operacional Ciencia e Inovacao 2010-POCI2010’’, SFRH/BPD/26532/2006. Fundo Comunitario Europeu (FEDER) - Projecto PTDC/ FIS/70194/200 |
| Databáze: | OpenAIRE |
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