Photoluminescence properties of eight coordinated terbium(III) complexes
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Eight coordinated terbium(III) complexes, tris (2-pyrazinecarboxylato)(phenanthroline) terbium(III)[Tb (pzc)3(phen)], tris (5-methyl-2-pyrazinecarboxylato) (phenanthroline) terbium(III) [Tb(mpzc)3(phen)] and tris(2-picolinato) (phenanthroline) terbium(III) [Tb(pic)3(phen)], have been synthesized and characterized by Fourier transform infrared (FT-IR), UV-Visible and X-ray photoelectron spectroscopy. Photoluminescence (PL)spectroscopy shows that these complexes emitted strong green luminescence. When powder samples of the Tb3+complexes are examined using time-resolved spectroscopic analysis, the luminescence lifetimes are found to be 0.87 ms and 1.0 ms, respectively. Thermogravimetric analysis reveals the terbium complexes to have good thermal stability up to 333-379 °C. Cyclic voltammetry shows that HOMO-LUMO energy gap of the Tb^(3+)complexes ranges from 4.26~4.41 eV. These values are similar to those obtained from the UV-visible spectra. Overall, the synthesized Tb^(3+) complexes may be useful advanced materials for green light emitting devices.
Abstract
Eight coordinated terbium(III) complexes, tris (2-pyrazinecarboxylato)(phenanthroline) terbium(III)[Tb (pzc)3(phen)], tris (5-methyl-2-pyrazinecarboxylato) (phenanthroline) terbium(III) [Tb(mpzc)3(phen)] and tris(2-picolinato) (phenanthroline) terbium(III) [Tb(pic)3(phen)], have been synthesized and characterized by Fourier transform infrared (FT-IR), UV-Visible and X-ray photoelectron spectroscopy. Photoluminescence (PL)spectroscopy shows that these complexes emitted strong green luminescence. When powder samples of the Tb3+complexes are examined using time-resolved spectroscopic analysis, the luminescence lifetimes are found to be 0.87 ms and 1.0 ms, respectively. Thermogravimetric analysis reveals the terbium complexes to have good thermal stability up to 333-379 °C. Cyclic voltammetry shows that HOMO-LUMO energy gap of the Tb^(3+)complexes ranges from 4.26~4.41 eV. These values are similar to those obtained from the UV-visible spectra. Overall, the synthesized Tb^(3+) complexes may be useful advanced materials for green light emitting devices.
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