Abstract
Multivariate terbium-complexes were incorporated into polyacrylonitrile (PAN) and electrospun into flexible multifunctional nanofibers with a uniform diameter of ~200 nm. Fluorescence comparison in multi-ligand-binding nanofibers under ultraviolet (UV) radiation verifies that the differentiated β-diketone ligands with dual functions are the primary cause of the spectral fluctuation, adequately illustrating the available methods for the quantification of intermolecular reciprocities between organic ligands and central Tb3+ ions. Especially under 308 nm UVB-LED pumping, the total emission spectral power of supramolecular Tb-complexes/PAN nanofibers are identified to be 2.88 µW and the total emission photon number reaches to 7.94 × 1012 cps which are nearly six times higher than those of the binary complex ones in the visible region, respectively. By modifying the sorts of organic ligands, the luminous flux and luminous efficacy of multi-ligand Tb-complexes/PAN nanofibers are up to 1553.42 μlm and 13.72 mlm/W, respectively. Efficient photon-releasing and intense green-emission demonstrate that the polymer-capped multi-component terbium-complexes fibers have potential prospects for making designable flexible optoelectronic devices.
Highlights
Multivariate terbium-complexes were incorporated into polyacrylonitrile (PAN) and electrospun into flexible multifunctional nanofibers with a uniform diameter of ~200 nm
Our work has focused on the use of multifunctional ligands to capture the energy and transfer to the rare-earth-metal-ions in PAN-capped electrospun nanofiber membranes, among which the multivariate terbium-complexes nanofibers have adopted organic ligands including acetylacetone, benzoic acid (BA) and 1,10-phenanthroline (Phen)
Spectroscopic intensity parameters of multivariate nanofibers are derived from spectral power and photon number, as well as the luminous flux is deducted under 308 nm UVB light emitting diode (UVB-LED) excitation, revealing the appropriate organic ligands are conducive to improving the efficiency of photon-conversion
Summary
Multivariate terbium-complexes were incorporated into polyacrylonitrile (PAN) and electrospun into flexible multifunctional nanofibers with a uniform diameter of ~200 nm. Efficient photon-releasing and intense green-emission demonstrate that the polymer-capped multi-component terbium-complexes fibers have potential prospects for making designable flexible optoelectronic devices. Some RE-complexes doped polymer nanofibers have been investigated[35,36,37], the systematic correlation on the fluctuation of photon-releasing with differentiated organic ligands in electrospun nanofibers is still worth exploring in making optoelectronic devices. Our work has focused on the use of multifunctional ligands to capture the energy and transfer to the rare-earth-metal-ions in PAN-capped electrospun nanofiber membranes, among which the multivariate terbium-complexes nanofibers have adopted organic ligands including acetylacetone (acac), benzoic acid (BA) and 1,10-phenanthroline (Phen). Spectroscopic intensity parameters of multivariate nanofibers are derived from spectral power and photon number, as well as the luminous flux is deducted under 308 nm UVB light emitting diode (UVB-LED) excitation, revealing the appropriate organic ligands are conducive to improving the efficiency of photon-conversion. The flexible polymeric nanofibrous membrane containing β-diketone ligands can be adopted as a developed prototype with characteristic of bending, stretching and even twisting and no negative effect on photon emission, these facilitate the development of the flexible wearable electronic devices
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