| Autor: |
M. G. Nikolić, Vesna Đorđević, M. D. Dramićanin, Ž. Antić |
| Rok vydání: |
2013 |
| Předmět: |
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| Zdroj: |
Journal of Research in Physics. 37:47-54 |
| ISSN: |
2217-933X |
| DOI: |
10.2478/jrp-2013-0005 |
| Popis: |
This work explores the influence of dopant concentration on photoluminescent emission and kinetics of Eu3+-doped (0.2−10 at.%) nanocrystalline lanthanumoxide powders. The X-ray diffraction analysis confirmed that all samples crystallize in La2O3 hexagonal phase with space group P3¯ m1. Transmission electron microscopy showed particles with non-uniform shape and diverse size distribution with an average particle size of (95 ± 5) nm. The room temperature photoluminescence spectra of all samples contain characteristic Eu3+ luminescence lines with the most pronounced red 5D0 →7F2 emission at about 626 nm. The maximum intensity of red emission is observed for the sample containing 5at.% of Eu3+ ions. The emission kinetics was recorded in the temperature range from 10K to 300 K. The maximum lifetime value of 0.98 ms obtained for the sample with 0.5at.% Eu3+ at room temperature increases up to 1.3ms at 10 K. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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