Abstract
A novel anhydrous preparation of silica (SiO2)-encapsulated terbium (Tb3+) complex nanoparticles has been investigated. The SiO2-Tb3+ nanoparticles are incorporated in electrospun polyvinylpyrrolidone hybrid nanofibers. Transmission electron microscopy confirms that Tb3+ complexes are uniformly and stably encapsulated in or carried by nanosilica. The influence of pH on the fluorescence of Tb3+ complexes is discussed. The properties, composition, structure, and luminescence of the resulting SiO2–Tb3+ hybrid nanoparticles are investigated in detail. There is an increase in the fluorescence lifetime of SiO2–Tb3+ nanoparticles and SiO2–Tb3+/polyvinylpyrrolidone (PVP) hybrid nanofibers compared with the pure Tb3+ complexes. Due to the enhanced optical properties, the fluorescent hybrid nanofibers have potential applications as photonic and photoluminescent materials.
Highlights
Studies on rare-earth-doped polymer-based light-emitting materials are of great interest, because they have played a pivotal role in the fields of medical diagnostics, displays, and detection systems [1]
The organic light emitters based on polymer materials show very good prospects, these materials have limited color purity and low luminous efficiency [2,3]
Since the f–f transitions of rare-earth ions belong to forbidden transitions, the absorption cross section of rare-earth ions in the visible or ultraviolet region is very small
Summary
Studies on rare-earth-doped polymer-based light-emitting materials are of great interest, because they have played a pivotal role in the fields of medical diagnostics, displays, and detection systems [1]. Rino et al successfully prepared a Tb(acac)3phen complex and used it as an emissive layer in organic light Emitting diodes (OLED) [2]. The matching of energy levels between rare-earth ions and organic ligands is one of the main factors affecting the luminescent efficiency of rare-earth complexes; because of the energy levels of terbium and acetylacetone (acac), they are matched properly. Rare-earth ion complexes with organic ligands have many advantages compared to other fluorophore types, such as narrow emission bands, high quantum yields, and nontoxicity. We report a new route for anhydrous preparation of SiO2 nanoparticles containing fluorescent Tb3+ complexes with acetyl acetone (acac) and phenanthroline (phen) (SiO2–Tb3+). Polyvinylpyrrolidone (PVP) ultrafine fibers containing SiO2–Tb3+ nanoparticles were prepared by electrospinning This new method for the preparation of fluorescent hybrid nanofibers has potential applications in the field of organic light-emitting materials
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