Controlling the visible luminescence in hydrothermal ZnO
| Autor: | Cuong Ton-That, L. L. C. Lem, Matthew R. Phillips |
|---|---|
| Rok vydání: | 2014 |
| Předmět: |
Materials science
Hydrogen Condensed Matter::Other Doping Biophysics Analytical chemistry chemistry.chemical_element Cathodoluminescence General Chemistry Condensed Matter Physics Photochemistry Biochemistry Atomic and Molecular Physics and Optics Spectral line Hydrothermal circulation Condensed Matter::Materials Science chemistry Physics::Atomic and Molecular Clusters Cathode ray Luminescence Excitation |
| Zdroj: | Journal of Luminescence. 154:387-391 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2014.05.014 |
| Popis: | Cathodoluminescence spectra have been measured in hydrothermal and hydrogen-doped ZnO at different excitation densities and temperatures to investigate the emission efficiencies of near-band-edge (NBE), green and yellow luminescence bands. The NBE intensity depends linearly on the electron beam excitation as expected for excitonic recombination character. The intensities of the green and yellow bands are highly dependent not only on the excitation density but also on temperature. At high excitation densities ZnO exhibits dominant green emission at room temperature; the intensity of the green band can be further controlled by doping ZnO with hydrogen, which passivates green luminescence centers. Conversely at small excitation densities ( |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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