Transition intensities of trivalent lanthanide ions in solids: Extending the Judd-Ofelt theory

Abstract

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Comparative analysis of lanthanide excited state quenching by electronic energy and electron transfer processes

“…Consideration was given to the utility of semi-empirical calculations of the energy of the key ligand, charge transfer and europium excited states involved in such a quenching process. However, the limited accuracy of such calculations, as exemplied in recent examples using DFT and modied Judd-Ofelt theory, 41,42 meant that such work was not undertaken for these complexes. Electronic energy transfer was examined from a Eu donor to a cyanine dye acceptor with which very good spectral overlap occurs.…”

Synthesis, Spectroscopy of New Lanthanide Complexes with Schiff Base Derived From (4-Antipyrinecarboxaldehyde with Ethylene Di-Amine) and Study the Bioactivity

“…It was noticed that the prepared complexes gave absorption packs in the range (3439 cm -1 -3439 cm -1 ), and this supports the presence of incoordination water molecules (outside the coordination sphere). It is worth noting that the prepared ligand possesses water molecules due to moisture at the (3441 cm -1 ) 40 . As shown in Table Electron transfers in lanthanides, Magnetic sensitivity and Molar Conductance of lanthanide Complexes:…”

“…The exception is the (La +3 ) ion, absorbed in the visible and nearultraviolet regions due to the absence of electrons in the (4f) orbitals of the ion (La +3 ). The colors of these ions' compounds are due to the electronic transition of the (f→f) type, and the bands of this spectrum appear in the form of sharp absorption bands, Because 4f is not an outer orbit electron, it is not impacted by the ligand or solvent, hence it is sharp and clear, and this phenomenon is the inverse of what is seen in the electronic spectrum of transition elements The transitions have been assigned to metal to ligand charge transfer (MLCT)or ligand to metal charge transfer (LMCT) 43 . The absorption spectra of all examined Ln +3 (lanthanide) complexes differ from the free Schiff base ligand in both intensity and pattern, showing that the Schiff base ligand is coordinated to Ln +3 ions.…”

Solution‐Phase Tuning of Emission of Divalent Europium

“…Photoexcitation of trivalent lanthanides involves Laporte-forbidden 4 f-4 f transitions and often requires antenna-assisted energy transfer to access excited states. [3] On the other hand, 4 f-5d transitions are prevalent in the divalent oxidation state of lanthanides. [4] Unlike, 4 f-4 f transitions, 4 f-5d transitions are Laporte-allowed, and hence, direct photoexcitation of divalent lanthanides results in luminescence.…”

“…Photophysical properties of lanthanides depend on their oxidation state. Photoexcitation of trivalent lanthanides involves Laporte‐forbidden 4 f–4 f transitions and often requires antenna‐assisted energy transfer to access excited states [3] . On the other hand, 4 f–5d transitions are prevalent in the divalent oxidation state of lanthanides [4] .…”