The effects of temperature and impurity phases on the luminescent properties of Ce 3+ -doped Ca 3 Sc 2 Si 3 O 12 garnet
| Autor: | N. P. Efryushina, S. S. Smola, A. S. Voloshinovskii, V. P. Dotsenko, Z.A. Khapko, I. V. Berezovskaya |
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| Rok vydání: | 2018 |
| Předmět: |
Materials science
Doping Biophysics Analytical chemistry Mineralogy 02 engineering and technology General Chemistry Atmospheric temperature range 010402 general chemistry 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences Biochemistry Atomic and Molecular Physics and Optics Spectral line 0104 chemical sciences Ion Impurity 0210 nano-technology Luminescence Absorption (electromagnetic radiation) Excitation |
| Zdroj: | Journal of Luminescence. 195:24-30 |
| ISSN: | 0022-2313 |
| DOI: | 10.1016/j.jlumin.2017.11.002 |
| Popis: | The luminescent properties of Ce3+ ions in Ca3Sc2Si3O12 were studied in the temperature range of 77–800 K. It was found, for the first time, that at 77 K zero-phonon lines of 5d↔4f transitions and vibronic structure are distinctly observed in the Ce3+ emission and excitation spectra. The decay time of the Ce3+ emission in Ca3Sc2Si3O12 was found to be nearly constant (~ 71 ns) up to 700 K. This indicates that the thermal quenching of the Ce3+ emission in Ca3Sc2Si3O12 starts at high temperatures (≥ 750 K). The decrease of the Ce3+ integrated emission intensity (upon direct excitation of the lowest-energy Ce3+ 5d1 state) with increasing temperature in the range of 350–700 K, often attributed to the thermal quenching, probably arises from temperature changes of 4f→5d1 transition absorption strength. It was shown that typical impurity phases (β-Ca2SiO4, CaSiO3, CeO2) can cause competing "parasitic" absorption in the 250–380 nm range and they are expected to be responsible for variations in the luminescence excitation and diffuse-reflection spectra reported in the literature for Ce3+-doped Ca3Sc2Si3O12. A comparison with literature data on Ce3+-doped aluminum garnets (Y3Al5O12 and Lu3Al5O12) is also made. |
| Databáze: | OpenAIRE |
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