LANTHANIDE – DEFECTS INTERACTIONS IN CERIA PROBED BY LUMINESCENCE SPECTROSCOPY
WG3 members: Carmen Tiseanu, Daniel Avram
homepage: nanolumin.inflpr.ro
The broad aim of our research is to investigate the structure – luminescence relationships occurring in lanthanide doped CeO2 materials. Our approach is based on the unitary investigation of their luminescence and structural properties. We use a broad range of experimental techniques based on room and low temperature luminescence with spectral and temporal resolution, excited state dynamics and excitation spectra. In collaboration with University of Bucharest and several international groups, we correlate the luminescence properties with the structural data obtained by use of in situ / ex situ X-ray diffraction and Raman spectroscopy, DRIFTS, HRTEM, etc.
Emission and excitation spectra of 10% Eu3+ – CeO2 – ZrO2 calcined at 750 (Left, CZE – 750) and 1000 °C (Right, CZE – 1000) show that, the addition of 10% Eu3+ via wet impregnation on prefomed CeO2 – ZrO2 followed by calcination at 1000 °C is leading to a highly homogenous solid solution of pseudo – cubic phase. “Exceptional capability of CeO2– ZrO2 to “dissolve” europium oxide established by time-resolved luminescence spectroscopy” Dalton Trans. DOI:10.1039/C3DT53254B (2014).
