| Autor: |
Konrad, A., Herr, U., Tidecks, R., Kummer, F., Samwer, K. |
| Předmět: |
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| Zdroj: |
Journal of Applied Physics; 10/1/2001, Vol. 90 Issue 7, p3516, 8p, 2 Charts, 12 Graphs |
| Abstrakt: |
The luminescence of nanocrystalline cubic yttria has been measured for 300 and 80 K. A blueshift and a broadening of the absorption edge, both depending on the particle size were found. The energy of the radiation emitted due to the recombination of a bound exciton does not depend on particle size. The observations are not caused by quantum or phonon confinement. Using a quantum mechanical configurational coordinate diagram an explanation can be given. Hydrostatic pressure increasing the phonon energy of the excited state of the bound exciton, or an increase of the exciton-phonon coupling may generate the size dependent optical properties of nanocrystalline yttria. © 2001 American Institute of Physics. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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