The electron absorption and emission spectra were measured for the pyramidal LnPc(OAc) complexes in the solid state and co-doped in silica glass, where Ln=Er, Eu and Ho. The theoretical electron ...spectra were determined from the quantum chemical DFT calculation using four approximations CAM-B3LYP/LANL2DZ, CAM-B3LYP/CC-PVDZ, B3LYP/LANL2DZ and B3LYP/CC-PVDZ. It was shown that the best agreement between the calculated and experimental structural parameters and spectroscopic data was reached for the CAM-B3LYP/LANL2DZ model. The emission spectra were measured using the excitations both in the ligand and lanthanide absorption ranges. The possibility of energy transfer between the phthalocyanine ligand and excited states of lanthanide ions was discussed. It was shown that the back energy transfer from metal states to phthalocyanine state is responsible for the observed emission of the studied complexes both in the polycrystalline state and silica glass.
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•Lanthanide(III) phthalocyanines of the LnPc(OAc) type were synthesized in the solid state.•Sol-gel glass doped with LnPc(OAc), Ln=Eu, Ho and Er, complexes was obtained.•The quantum chemical DFT calculations using four theoretical models have been done.•Luminescence of ligand is only visible.
Eu3+ complex with 1-(2,6-dihydroxyphenyl)ethanone in the solid state has been synthesized and characterized by elemental analysis, UV–visible, FT-IR and FT-Raman spectroscopies, powder X-ray ...diffraction, electron emission under femtosecond laser excitation. The stoichiometry and the formula of the studied complex have been proposed. Its physicochemical properties have been analyzed in terms of the structure and DFT calculations performed for the ligand. The luminescence and dynamics of the excited states depopulation have been studied using femtosecond laser excitation. Spectral and energetic transformation of femtosecond light impulses has been studied and possibility of the energy transfer between the ligand and the Eu3+ electron levels has been analyzed.
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•Eu3+ complex with 1-(2,6-dihydroxyphenyl)ethanone in the solid state has been synthesized.•DFT calculations have been performed for the DHPE ligand.•The luminescence and dynamics of the excited states depopulation have been studied using femtosecond laser excitation.•Millisecond lifetime of the 5D0 level tends to confirm that Eu/DHPE complex could be a light-conversion molecular device.
► Extremely low concentration of Nd, Yb, Er ions was introduced to KY(WO4)2 simultaneously. ► EPR spectra were analyzed to describe their local symmetry in the crystal. ► All the ions substitute for ...Y ion at C2 point symmetry as isolated entities. ► Principle values of g and A matrices from spin Hamiltonian were determined.
Well oriented KY(WO4)2 single crystal weakly doped simultaneously with Er, Yb and Nd have been investigated using EPR technique. Angular dependencies of the EPR lines clearly confirm C2 symmetry of all: Er3+, Yb3+ and Nd3+ dopants. Basic parameters of the spin Hamiltonian, including Zeeman and hyperfine terms (g and A matrices) as well the spatial orientation between principal axes system and crystallographic axes system were determined.
•Cr3+doped Na3Ce(PO4)2 crystalline powders were synthesized by Pechini method.•The optical and magnetic properties of Na3Ce(PO4)2:Cr3+ were investigated.•Cr3+ ions in the distorted octahedral ...environment replace Ce3+ in the unit cell.•EPR and magnetic data reveal two different kinds of chromium centers appear.
Micro-crystalline powders of Na3Ce(PO4)2 orthophosphate doped with Cr3+ ions were synthesized and characterised by means of X-ray diffraction, IR and Raman, electron absorption, magnetic and EPR studies. The emission and excitation spectra and fluorescence decay time were recorded in the temperature range 70–293K. The spectroscopic properties of Ce3+ and Cr3+ ions in the studied materials were discussed in terms of the structure and local symmetry of the optical ions. These data were compared to those obtained for NaCe(PO3)4 metaphosphate.
