Highly luminescent europium(III) complexes with naphtoiltrifluoroacetone and dimethyl sulphoxide
authors Carlos, LD; Donega, CD; Albuquerque, RQ; Alves, S; Menezes, JFS; Malta, OL
nationality International
journal MOLECULAR PHYSICS
keywords EMISSION QUANTUM YIELD; ION ENERGY-TRANSFER; SPECTROSCOPIC PROPERTIES; COORDINATION-COMPOUNDS; MIXED COMPLEXES; LIGAND; DEPENDENCE; SULFOXIDE); INTENSITY; GLASS
abstract The synthesis, luminescence properties, experimental determination and theoretical calculation of the emission quantum yield of Eu(NTA)(3).2L complexes, where NTA is naphtoiltrifluroacetone and L denotes H2O or DMSO (dimethyl sulphoxide), were reported. The compounds were characterized by elemental analysis (carbon, hydrogen and europium), thermal analysis, UV-visible absorption and photoluminescence spectroscopies. The experimental quantum yields were determined based on a method previously proposed by Bril and collaborators. The Eu(NTA)(3).2DMSO compound shows a high value for the 02 intensity parameter (35.8 x 10(-20) cm(2)), reflecting the hypersensitive nature of the D-5(0) --> F-7(2) transition and indicating that the lanthanide ion is in a highly polarizable chemical environment. The experimental quantum yield measured for that compound, 0.75, is one of the highest so far reported for solid-state europium complexes. The theoretical calculations of the quantum yield were carried out by solving an appropriate set of rate equations and by using empirical spectroscopic parameters and energy transfer rates. The theoretical results agree well with the experimental data for both complexes. The photostability of Eu(NTA)(3).2DMSO at 358 K was evaluated in order to verify whether this complex can be applied as a phosphor for blue light emitting devices.
publisher TAYLOR & FRANCIS LTD
issn 0026-8976
year published 2003
volume 101
issue 7
beginning page 1037
ending page 1045
digital object identifier (doi) 10.1080/0026897021000046898
web of science category Chemistry, Physical; Physics, Atomic, Molecular & Chemical
subject category Chemistry; Physics
unique article identifier WOS:000182471900023
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