Structural and optical characterization of Tm3+-doped apatite related NaLa9(GeO4)6O2 phosphors
| Autor: | Ludmila L. Surat, A.P. Tyutyunnik, M. A. Melkozerova, A. Yu. Chufarov, Ya. V. Baklanova, Olga A. Lipina, Vladimir G. Zubkov |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
010302 applied physics
education.field_of_study Photoluminescence Materials science Dopant Infrared Process Chemistry and Technology Population Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences Spectral line Surfaces Coatings and Films Electronic Optical and Magnetic Materials Excited state 0103 physical sciences Materials Chemistry Ceramics and Composites Diffuse reflection 0210 nano-technology Spectroscopy education |
| Zdroj: | Ceramics International. 46:26416-26424 |
| ISSN: | 0272-8842 |
| Popis: | New apatite-type NaLa9-xTmx(GeO4)6O2 (x = 0.025–0.8) germanates (space group P63/m, Z = 1) have been prepared using both the citrate technique and the conventional solid state method. The samples were characterized by powder X-ray diffraction, scanning electron microscopy, diffuse reflectance and photoluminescence spectroscopy. Photoluminescence measurements of NaLa9-xTmx(GeO4)6O2 compounds were carried out both in the 425–850 nm range under 356 nm excitation and in the infrared region under 808 nm excitation. The most intensive lines at 453 nm, 478 nm and in 625–850 nm wavelength range are associated with the 1D2 → 3F4, 1G4 → 3H6 and a series of 1G4 → 3F4, 3F2 → 3H6, 3H4 → 3H6 transitions in Tm3+ ions. The spectra measured in the infrared spectral range consist of two broad emission bands centered at 1440 nm and 1810 nm, which correspond to the cascade 3H4°→°3F4 and 3F4°→°3H6 transitions in Tm3+. The influence of dopant content and temperature on possible mechanisms promoting the population of Tm3+ excited states has been studied. |
| Databáze: | OpenAIRE |
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