Tunable luminescence modulation and warm light emission of Zn-MOF (4,4 `-bipyridyl and zinc acetate) doped with Eu3+ and Tb3+
Por:
Peña-Rodríguez R., Molina-González J.A., Desirena-Enrriquez H., Rivera-Villanueva J.M., Castillo-Blum S.E.
Publicada:
1 feb 2019
Resumen:
Herein, we describe the synthesis and doping of Zn-MOF (4,4'-bipyridyl
and zinc acetate), crystallographic structure, optical properties of
heteronuclear coordination polymers with emission in the visible
(Eu3+/Tb3+ and Zn-MOF). The MOF presents a linear structure in the form
of a nanotube. Density functional theory (DFT) and time dependent-DFT
calculations were performed on the ground and excited states of Zn-MOF
to provide insight of geometries, frontier molecular orbitals, and
singlet and triplet state energies of the polymer. The metal-organic
framework was doped with Eu3+ or Tb3+ in different proportions
(Eu0.5-nTbn@Zn-MOF, when n = 0.00, 0.05, 0.10, 0.15, ..., 0.5). The
doped Zn-MOFs exhibit the typical red and green emission corresponding
to Eu3+ and Tb3+ ions, respectively, energy transfer from MOF to metal
ions takes place (''antenna effect''). It is noteworthy that the
emission color of the lanthanides doped Zn-MOFs changes from red to
orange-yellow-green depending on the proportion between Eu3+ and Tb3+.
These compounds presented a tau ranging from 1.29 to 1.62 and 1.06-1.56
ms for Eu3+ and Tb3+, respectively, and the corresponding absolute
quantum yields values range from 38 to 61%.
Filiaciones:
Peña-Rodríguez R.:
Facultad de Química, Universidad Nacional Autónoma de México, CDMX, Mexico
Molina-González J.A.:
Centro de Investigaciones en Óptica, León, Gto., Mexico
Desirena-Enrriquez H.:
Centro de Investigaciones en Óptica, León, Gto., Mexico
Rivera-Villanueva J.M.:
Facultad de Ciencias Químicas, Universidad Veracruzana, Orizaba, Ver., Mexico
Castillo-Blum S.E.:
Facultad de Química, Universidad Nacional Autónoma de México, CDMX, Mexico
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