abstract
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] 4 ] (1Ln), 1Ln ), [Ln(SP)3bpy] 3 bpy] (2Ln); 2Ln ); [Ln (SP)3phen] 3 phen] (3Ln) 3Ln ) (Ln = Eu3+, 3 + , Gd3+, 3 + , Tb3+ 3 + and Lu3+) 3 + ) were obtained and characterized by the X-ray, photoluminescence spectroscopy at 293 and 77 K as well as by intrinsic ( Q Ln Ln ) and overall ( Q L Ln ) luminescence quantum yields. These phosphors manifest a very strong emission after excitation in the UV range of the molecular singlet states (S1) 1 ) and two of them have very high Q L Ln values (Eu3+ 3 + and Tb3+ 3 + 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 Q L Ln can be obtained. A good correlation between the experimentally determined and theoretically calculated Q L Ln values was achieved, with the triplet state (T1) 1 ) playing a predominant role in the energy transfer process for Eu3+ 3+ compounds, while the sensitization for Tb3+ 3+ compounds is dominated by the energy transfer rates from the singlet state (S1). 1 ).
keywords
YB(III) MONO-PHTHALOCYANINES; SPECTROSCOPIC BEHAVIOR; PHOTOPHYSICAL PROPERTIES; TRIPLET-STATE; SOLID-STATE; COMPLEXES; EMISSION; FIELD; LUMINESCENCE; MODEL
subject category
Science Citation Index Expanded (SCI-EXPANDED)
authors
Neto, ANC; Nasalska, J; Gawryszewska, P; Trush, VA; Sokolnicki, J; Malta, OL; Legendziewicz, J
our authors
Albano Neto Carneiro Neto
Junior ResearcherProjects
CICECO - Aveiro Institute of Materials (UIDB/50011/2020)
CICECO - Aveiro Institute of Materials (UIDP/50011/2020)
Associated Laboratory CICECO-Aveiro Institute of Materials (LA/P/0006/2020)
acknowledgements
University of Wroclaw [UIDB/50011/2020, UIDP/50011/2020, LA/P/0006/2020, PTDC/CTMCTM/0340/2021]; Portuguese funds through the FCT/MEC (PIDDAC)