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Intramolecular energy transfer and its influence on the overall quantum yields of Eu3+ and Tb3+ chelates with dimethyl(phenylsulfonyl)amidophosphate ligands
Autorzy
Rok wydania
2025
Czasopismo
Spectrochimica Acta Part A-Molecular and Biomolecular Spectroscopy
Numer woluminu
324
Strony
124875/1-124875/11
DOI
10.1016/j.saa.2024.124875
Kolekcja
Język
Angielski
Typ publikacji
Artykuł
Lanthanide chelates with dimethyl(phenylsulfonyl)amidophosphate (labeled as HSP) and Lewis base ligands (bpy = 2,2;-bipyridine and phen = 1,10-phenanthroline) of formula Na[Ln(SP)4] (1Ln), [Ln(SP)3bpy] (2Ln); [Ln(SP)3phen] (3Ln) (Ln = Eu3+, Gd3+, Tb3+ and Lu3+) were obtained and characterized by the X-ray, photoluminescence spectroscopy at 293 and 77 K as well as by intrinsic (�LnLn) and overall (�Ln�) luminescence quantum yields. These phosphors manifest a very strong emission after excitation in the UV range of the molecular singlet states (S1) and two of them have very high �Ln� values (Eu3+ and Tb3+ chelates of the type 2Ln and 3Ln). The dynamics of the excited states are discussed based on the intramolecular energy transfer theory, considering the dipole–dipole, the dipole-multipole and the exchange mechanisms. From the calculated energy transfer rates, a rate equation model was constructed and, thus, the theoretical �Ln� can be obtained. A good correlation between the experimentally determined and theoretically calculated �Ln� values was achieved, with the triplet state (T1) playing a predominant role in the energy transfer process for Eu3+ compounds, while the sensitization for Tb3+ compounds is dominated by the energy transfer rates from the singlet state (S1).
Słowa kluczowe
sulfonylamidophosphates, luminescence, energy transfer rates, quantum yields, theoretical calculations
Adres publiczny
http://dx.doi.org/10.1016/j.saa.2024.124875
Strona internetowa wydawcy
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