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EPR, optical, and dielectric spectroscopy of Er‐doped cerium dioxide nanoparticles
Author(s) -
Rakhmatullin R. M.,
Kurkin I. N.,
Pavlov V. V.,
Semashko V. V.
Publication year - 2014
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.201451116
Subject(s) - dopant , materials science , cerium , ion , electron paramagnetic resonance , analytical chemistry (journal) , nanoparticle , doping , thermoluminescence , dielectric , luminescence , spectroscopy , nuclear magnetic resonance , optoelectronics , chemistry , nanotechnology , physics , organic chemistry , chromatography , metallurgy , quantum mechanics
Abstractauthoren Abstractauthoren The cerium dioxide nanoparticles doped at low level with Er ions and with grain sizes of about 22 and 300 nm were comprehensively studied using EPR, optical and microwave dielectric spectroscopy. The EPR observation of mainly cubic sites of Er3 +dopant in CeO2 reveals that vacancies are located more distant than the nearest neighbor position. This finding does not agree with recently published results based on density functional theory calculations. Time and spectral dependences of the permittivity of Er:CeO2 nanoparticles under UV laser excitation were studied by a Q‐band microwave resonance technique at the room temperature. The photoconductivity threshold for cerium dioxide nanoparticles has been estimated. The luminescence spectra for the nanocrystals in wide spectral range ( λ = 240–1000 nm) were investigated. The anti‐Stokes emission of Er3 +ions under irradiation in 545–562 nm spectral range, stipulated by the thermally coupled2 H11 / 2and4 S3 / 2levels of Er3 +ions, has been observed. The UV irradiation (240–370 nm), which is not resonant with the 4f–4f transitions of Er3 +ions, excites emission of Er3 +ions due to the charge transfer from O2 −to Ce4 +host ions and the subsequent energy transfer to Er3 +dopant ions.