authors |
Francis, B; Nolasco, MM; Brandao, P; Ferreira, RAS; Carvalho, RS; Cremona, M; Carlos, LD |
nationality |
International |
journal |
EUROPEAN JOURNAL OF INORGANIC CHEMISTRY |
author keywords |
Luminescence; Europium; Photophysics; Visible-light excitation; LUMPAC; OLEDs |
keywords |
BETA-DIKETONATE COMPLEXES; LUMINESCENT LANTHANIDE COMPLEXES; INTRAMOLECULAR ENERGY-TRANSFER; EMISSION QUANTUM YIELD; RADIATIVE LIFETIME; INORGANIC HYBRIDS; LIGAND; EUROPIUM(III); SENSITIZATION; OXIDE |
abstract |
Visible-light-excited Eu3+ complexes have received much attention in the last years due to the rapidly increasing demand for less-harmful biomarkers and low-voltage driven emitters in optoelectronics. Nevertheless, these complexes usually exhibit poor emission quantum yields, contrarily to the ones excited in the ultraviolet spectral region. To address this challenge, a series of complexes based on trivalent lanthanide ions, [Eu(bpyO2)(CH3OH)(2)(H2O)(NO3)(2)](NO3) (1), [Gd(bpyO2)(H2O)(4)(Cl)(2)]Cl (4), Ln(tta)(3)(H2O)(C2H5OH) {Ln = Eu (2), Gd (5)} and Ln(tta)(3)(bpyO2) {Ln = Eu (3), Gd (6)}, were synthesized using 2-thenoyltrifluoroacetone (Htta) as primary ligand and 2,2'-dipyridyl N,N'-dioxide (bpyO2) as neutral donor, and characterized, with special emphasis on their crystal structures and luminescence properties. Single crystal X-ray diffraction revealed that the central metal ion has a coordination number of 9 in 1, and 8 in all other complexes. Complex 3 exhibited a broad excitation spectrum ranging from 250 to 480 nm, exhibiting, when compared to 1 and 2, higher absolute emission quantum yields of 0.46, 0.36 and 0.33, for excitation at 400, 425, and 450 nm, respectively. The theoretical intensity parameters, radiative and non-radiative decay rates, and intrinsic and absolute emission quantum yields were assessed using the LUMPAC software displaying a very good accord with the experimental values. Moreover, organic light-emitting diodes with a maximum efficiency of 5.7 x 10(-2) cd A(-1) at 14 V were fabricated using 3 as an emitting layer. |
publisher |
WILEY-V C H VERLAG GMBH |
issn |
1434-1948 |
isbn |
1099-0682 |
year published |
2020 |
volume |
2020 |
issue |
14 |
beginning page |
1260 |
ending page |
1270 |
digital object identifier (doi) |
10.1002/ejic.202000027 |
web of science category |
Chemistry, Inorganic & Nuclear |
subject category |
Chemistry |
unique article identifier |
WOS:000516636800001
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ciceco authors
impact metrics
journal analysis (jcr 2019):
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journal impact factor |
2.529 |
5 year journal impact factor |
2.284 |
category normalized journal impact factor percentile |
65.556 |
dimensions (citation analysis):
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altmetrics (social interaction):
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