Preparation of PVA Fluorescent Gel and Luminescence of Europium Sensitized by Terbium (III)

Abstract

Polyvinyl alcohol (PVA) gel has a very wide range of applications in agriculture, military, industry, and other fields. As a widely used water-soluble polymer, PVA has good mechanical properties, excellent spinnability, good hydrophilicity, remarkable physical and chemical stability, good film formation, is non-polluting, and exhibits good natural degradation and biocompatibility. It is an ideal gel preparation material. Incorporation of rare-earth elements into PVA polymers can be used to prepare rare-earth luminescent gel materials. Results show that the luminescent efficiency of complexes is mainly related to their structure, ligand substituents, synergists, and the electronic configuration of doped rare-earth ions. Fluorescent gel films were prepared by adding europium, terbium, and europium/terbium co-doped into PVA, and their fluorescence properties were compared and analyzed. It was found that, in addition to the above factors, the sensitization of terbium to europium, and the fluorescence-quenching effect of hydroxyl groups, will influence the fluorescence properties. This has opened a new route for the application of rare-earth materials and may have value in the field of new materials.

One-Step Synthesis of Eu3+-Modified Cellulose Acetate Film and Light Conversion Mechanism

“…The peaks observed at 1367 cm −1 and 900 cm −1 are due to the characteristic absorption peaks of –CH 3 [ 16 ] and the β-linked glucan structure [ 17 ]. The new vibration peaks appeared in the light conversion films at 810 cm −1 and 737 cm −1 , which correspond to the infrared characteristic peaks of Eu–O and Tb–O [ 18 ] indicating the formation of coordination structures. Table S1 (see Supplementary Materials) summarizes the positions and changes of some absorption peaks of the films.…”

Luminescent Coatings Based on (3-Aminopropyl)triethoxysilane and Europium Complex β-Diketophosphazene

“…This excitation that also known as the "antenna effect" is possessed by coordination ligands which can transfer energy from the ligand to the metal center resulting in luminescence of lanthanide ions [9]. A large number of special ligands have been synthesized for sensitizing the luminescence of metals [10][11][12][13][14][15][16][17], in particular, europium [18][19][20]. Among them βdiketones are excellent chelating ligands used to sensitize the luminescence of the europium ion and have proven themselves well [10,21,22].…”

Pyridine-Dicarbohydrazone-Based Polyacrylate Hydrogels with Strong Mechanical Property, Tunable/Force-Induced Fluorescence, and Thermal/pH Stimuli Responsiveness

“…Lanthanide ions are usually regarded as prior metal ions to make fluorescent materials with different colors because of their excellent coordination abilities and fluorescence properties. 3,16,17 d−f transition enables intense metal-center luminescence, particularly when incorporated with sensitizing ligands in the first coordination sphere. 18−22 Based on that, Weng et al 23 have reported a multistimuli responsive fluorescent hydrogel controlled by the dynamic coordination of Eu 3+ -iminodiacetate.…”