A rare earth-containing curdlan flexible luminescent film and preparation method thereof

Abstract

The invention discloses a gel polysaccharide flexible luminescence film containing rare earth, and a preparation method thereof. The gel polysaccharide flexible luminescence film comprises a rare earth luminescent material and an organic ligand modified gel polysaccharide derivative (as a second ligand) at a mass ratio of 1:50; the a rare earth luminescent material comprises an organic ligand andclay; the rare earth ion exchange capacity of the clay is about 0.3 to 1.1 / unit; the rare earth element is one or a plurality of elements selected from Ln series luminescent elements, the organic ligand is alpha-thenoyltrifluoroacetone, 1,10-Phenanthroline monohydrate and a terpyridyl are taken as first ligands, the gel polysaccharide derivative comprises a gel polysaccharide and a carboxyl functionalized organic ligand at a molar ratio of 1:5. The invention also discloses a modification method of the gel polysaccharide derivative, a preparation method of the luminescent material, and the preparation method of the gel polysaccharide flexible luminescence film containing rare earth. The product performance is excellent; the preparation method is green, and is friendly to the environment; and the light transmittance performance is excellent.

Description

technical field [0001] The invention belongs to the field of rare earth luminescent materials, and relates to a transparent luminescent film and a preparation method thereof, in particular to a flexible rare earth transparent luminescent film based on modified natural polysaccharides, nanoclay and rare earth complexes and a preparation method thereof. Background technique [0002] The unique luminescent properties of rare earth complexes such as large Stokes shift, sharp emission distribution and long-lived excited state have long fluorescence lifetime, good luminous monochromaticity, strong light absorption ability, rich emission spectral lines, and luminous coverage. They have potential applications in the fields of lighting, display, bioluminescent labeling, etc. However, the defects of pure complexes limit their practical applications, such as poor light and thermal stability and mechanical properties, Poor film-forming properties and easy agglomeration, etc., many resea...

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Problems solved by technology

[0004] Thin-filming of luminescent materials is an important prerequisite for realizing their devices. Combining luminescent materials with polymer materials to prepare transparent films can broaden the application of luminescent materials in flexible and foldable light-emitting devices. However, in the preparation of traditional luminescent films The polymer materials used are petroleum cracking products such as PVA, PMMA, and PAS. Due to the non-renewability of raw materials based on the traditional petroleum industry and coal industry, people urgently need to develop new materials from renewable resources through green processes. To meet the needs of society, therefore, the search for natural polymer materials to replace synthetic polymer materials in the petrochemical industry chain has aroused great concern. Curdlan is the most characteristic of the β-1,3-glucan family It is a new type of microbial exopolysaccharide with branched chains on its main chain. It has been determined by chemical and enzymatic analysis that the polysaccharide is composed of glucose in C 1 and C 3 It is an unbranched polysaccharide polymer connected by β-1,3-glycosidic bonds. This macromolecular β-1,3-glucan is composed of about 300-500 glucose residues, and its average polymerization The degree is 450, the relative molecular weight is about 74,000, and it mainly exists in a long chain structure. However, due to the interaction within the molecule and the hydrogen bonding between the molecules, it can form a more complex three-dimensional structure. In the natural state, it is Existing in the form of circular small particles, similar to the structure of starch, curdlan is insoluble in water, which limits its wide application, but there are a large number of hydroxyl groups in the curdlan molecule, which can be repeated through chemical modification. On the one hand, the introduction of these groups can improve its solubility. In recent years, many researchers have modified it to greatly improve its water solubility, which has laid a good foundation for the next work. good foundation

[0005] In summary, the traditional luminescent film preparation process is not environmentally friendly. Curdlan can be used as a substitute for traditional synthetic polymer materials to improve the environmental protection of the film preparation process, but it is difficult to dissolve in water and conventional organic solvents, which limits Therefore, it is necessary to find an effective solvent to promote its dissolution without affecting the luminescent properties of the film.

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