Wavelength dependent loading of traps in the persistent phosphor SrAl2O4:Eu2+, Dy3+
| Autor: | Bernhard Walfort, Simone Pokrant, Jakob Bierwagen, Hans-Rudolf Hagemann, Dominique Lovy, Nando Gartmann, Seock Jun Yoon |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
010302 applied physics
education.field_of_study Materials science Population Biophysics Analytical chemistry Phosphor 02 engineering and technology General Chemistry Trapping 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Molecular physics Thermoluminescence Atomic and Molecular Physics and Optics Wavelength ddc:540 0103 physical sciences 0210 nano-technology education Phosphorescence Excitation Intensity (heat transfer) |
| Zdroj: | Journal of Luminescence Journal of Luminescence, Vol. 170 (2016) pp. 299-304 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2015.10.035 |
| Popis: | The persistent phosphorescence and thermoluminescence of SrAl2O4:Eu2+:Dy3+ is reported for a variety of different excitation wavelengths and excitation temperatures, to provide new insights in the mechanism of the trapping and detrapping. These measurements reveal that the trapping is strongly dependent on the wavelength and temperature. First, with increasing loading temperature, the thermoluminescence peak shifts to lower temperatures which corresponds to a change of trap population. Secondly, the integrated thermoluminescent intensity increases with increasing loading temperature. All wavelength and temperature dependent experiments indicate that the loading of the traps is a thermally activated processes. Utilizing different wavelengths for loading, this effect can be enhanced or reduced. Furthermore excitation with UV-B-light reveals a tendency for detrapping the phosphor, reducing the resulting thermoluminescent intensity and changing the population of the traps. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect