Exciton trapping in LaPO4doped with trivalent cerium and/or terbium ions
| Autor: | P.-H. Meunier-Beillard, Christophe Dujardin, X. Cieren, V. Archambault, Bernard Moine, C. Pedrini, D. Huguenin |
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| Rok vydání: | 1999 |
| Předmět: |
Nuclear and High Energy Physics
Radiation Materials science Exciton Doping chemistry.chemical_element Terbium Condensed Matter Physics Photochemistry Ion Cerium chemistry Absorption band Excited state Radiative transfer Physical chemistry Condensed Matter::Strongly Correlated Electrons General Materials Science |
| Zdroj: | Radiation Effects and Defects in Solids. 149:25-30 |
| ISSN: | 1029-4953 1042-0150 |
| DOI: | 10.1080/10420159908230127 |
| Popis: | Here, we present a study of exciton behaviour in LaPO4 doped with trivalent cerium and/or terbium ions. In undoped LaPO4 excited at 155 nm a weak emission is observed at 260 nm. The same emission is also detected in the weakly cerium or terbium doped samples. This emission is probably due to self-trapped exciton (STE). It matches exactly the 4f → 5d absorption band of cerium ions leading to an efficient energy transfer. The nature of this transfer, radiative and/or non-radiative, is analysed. In terbium doped sample the energy transfer from the STE exists but seems to be less efficient. This is essentially due to the fact that the STE emission overlaps terbium 4f → 4f transitions, the oscillator strengths of which are much weaker. |
| Databáze: | OpenAIRE |
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