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Temperature and time dependent photoluminescence of single crystalline KEu(WO4)2
- Source :
- Journal of Luminescence. 215:116653
- Publication Year :
- 2019
- Publisher :
- Elsevier BV, 2019.
-
Abstract
- This work describes the growth of crack-free single crystals of KEu(WO4)2 and their characterization with respect to spectroscopic properties. The crystal structure of KEu(WO4)2 was refined from single crystal X-ray diffractometer data at 293 (KY(WO4)2 type, C2/c, a = 1069.88(7), b = 1046.87(5), c = 760.47(5) pm, β = 130.774(4)°, wR2 = 0.0513, 1247 F2 values and 57 variables) and 90 K (a = 1067.69(4), b = 1048.45(4), c = 757.87(3) pm, β = 130.784(2)°, wR2 = 0.1078, 1237 F2 values and 57 variables). It turns out that KEu(WO4)2 is a promising material for some demanding application areas due to its excellent thermal stability. Temperature dependent spectroscopy revealed that the thermal quenching temperature T1/2 of the crystalline material is 699 K (426 °C). From time dependent emission spectra the fluorescence lifetime τr was determined to be 498 ± 2 μs at 3 K. The decay time moderately declines down to 480 μs at room temperature pointing to the presence of very little thermal quenching at ambient conditions. A strong decline of the emission integral and decay time is not observed before reaching almost 600 K. Finally, the quantum efficiency was determined to be about 64% at room temperature and the asymmetry ratio for the 5D0 -7F2 to 5D0 -7F1 emission multiplets is about 10.8, which means that the Eu3+ spectrum is dominated by the 5D0 – 7F2 transition. 151Eu Mossbauer spectroscopic and temperature dependent magnetic susceptibility data confirm stable trivalent europium.
- Subjects :
- Photoluminescence
Materials science
Biophysics
Analytical chemistry
chemistry.chemical_element
02 engineering and technology
General Chemistry
Crystal structure
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
Biochemistry
Magnetic susceptibility
Atomic and Molecular Physics, and Optics
0104 chemical sciences
chemistry
Emission spectrum
0210 nano-technology
Spectroscopy
Europium
Single crystal
Diffractometer
Subjects
Details
- ISSN :
- 00222313
- Volume :
- 215
- Database :
- OpenAIRE
- Journal :
- Journal of Luminescence
- Accession number :
- edsair.doi...........79fb9a766aafd87ac94933f214c31de6