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4f^n-4f^n-1d-transitions in the optical spectra of tris (1,2,4-triphenylcyclopentadienyl) complexes of the lanthanide ions

Russian version

DOI: 10.61011/EOS.2023.04.56361.78-22

Puntus L. N. ¹, Varaksina E. A.², Lyssenko K.A. ^3,4, Roitershtein D.M.^5,6

¹Fryazino Branch, Kotel’nikov Institute of Radio Engineering and Electronics, Russian Academy of Sciences, Fryazino, Moscow oblast, Russia
²Lebedev Physical Institute, Russian Academy of Sciences, Moscow, Russia
³Department of Chemistry, Lomonosov Moscow State University, Moscow, Russia
⁴Plekhanov Russian University of Economic, Moscow, Russia
⁵National Research University Higher School of Economics, Moscow, Russia
⁶Topchiev Institute of Petrochemical Synthesis, Russian Academy of Sciences, Moscow, Russia

Email: ladapuntus@gmail.com, janiy92@yandex.ru, klyssenko@gmail.com, roiter@yandex.ru

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Abstract
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Tris complexes of Ln³⁺ ions (Ln = La, Ce, Pr), with triphenyl-substituted cyclopentadienyl ligands were studied by optical spectroscopy. Emission of both 5d-4f and 4f-4f transitions was observed for Pr³⁺ complex. It was found that the strength of the crystal field formed by triphenyl-substituted cyclopentadienyl ligands in tris complexes is comparable to the case of sulfides, and as a result, red luminescence is observed for the Ce³⁺ compound. The quantum yield of photoluminescence is 20% for the latter. Keywords: 5d-4f-luminescence, ligand field, quantum yield of photoluminescence, Ln³⁺ ions, cyclopentadienyl ligand. DOI: 10.61011/EOS.2023.04.56361.78-22

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