Green photoluminescence efficiency and free-carrier density in ZnO phosphor powders prepared by spray pyrolysis
| Autor: | William L. Warren, J. Caruso, David R. Tallant, M. J. Hampden-Smith, Karel Vanheusden, T. T. Kodas, Carleton H. Seager |
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| Rok vydání: | 1997 |
| Předmět: |
Photoluminescence
Materials science Biophysics Analytical chemistry chemistry.chemical_element Phosphor General Chemistry Condensed Matter Physics Biochemistry Oxygen Atomic and Molecular Physics and Optics law.invention Paramagnetism chemistry law Luminescence Electron paramagnetic resonance Spectroscopy Absorption (electromagnetic radiation) |
| Zdroj: | Journal of Luminescence. 75:11-16 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/s0022-2313(96)00096-8 |
| Popis: | Electron paramagnetic resonance, optical absorption, and photoluminescence spectroscopy have been combined to characterize ZnO powders that were prepared by spray pyrolysis. We generally observe a good correlation between the 510 nm green emission intensity and the density of paramagnetic isolated oxygen vacancies. In addition, both quantities increase with free-carrier concentration n e , as long as n e 18 cm −3 . At higher free-carrier concentrations, both quantities decrease. A model is proposed involving the isolated oxygen vacancy as the luminescence center. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
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