Polycarboxylic acid and europium complex luminescent material and preparation method thereof

Abstract

The invention discloses a polycarboxylic acid and europium complex luminescent material and a preparation method thereof. The complex luminescent material is a three-dimensional coordination polymer containing two types of organic polycarboxylic acid anion ligand, and the general formula of the three-dimensional coordination polymer is [Eu2(1, 2-bdc)2(3, 5-pdc) (H2O)4]n, wherein 1, 2-bdc is phthalic acid di-anion; 3, 5-pdc is 3, 5-pyridinedicarboxylic acid di-anion; n is natural number not less than 100. The preparation method comprises the following steps: weighting 3, 5-pyridinedicarboxylic acid and potassium acid phthalate or phthalic acid, wherein the amount ratio of 3, 5-pyridinedicarboxylic acid substance to potassium acid phthalate or phthalic acid substance is 0.00008-0.00012mol to 0.00016-0.00024mol; adding deionized water to an europium compound; regulating the pH value to be 4-6; transferring into an oven to react for 48-80h; then decreasing the temperature at the speed of 1-5 DEG C per hour, wherein an europium complex obtained when the temperature is decreased to be less than 100 DEG C is a colorless crystal; then washing with absolute ethyl alcohol to obtain the complex luminescent material.

Description

technical field [0001] The invention relates to a preparation method for synthesizing a three-dimensional coordination polymer by reacting europium perchlorate, 3,5-pyridinedicarboxylic acid and potassium hydrogen phthalate under hydrothermal conditions. Background technique [0002] The synthesis and properties of rare earth complexes are one of the important contents of rare earth chemistry research, especially in the fields of luminescence, magnetism, catalysis, and gas adsorption of complexes, which are current research hotspots. The complexes of samarium, europium, terbium, and dysprosium among the rare earth elements have good photoluminescent properties in the visible region, especially the two elements of europium and terbium, when the organic ligands are selected properly, they can generate The complex has potential broad application prospects in photoluminescence and electroluminescence materials. Wherein, the europium complex emits red characteristic fluorescence...

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Problems solved by technology

[0003] Eu 3+ There are 6 4f electrons in the outermost layer, which are easy to form 8 or 9 coordination. There are three types of organic ligands coordinated by metal europium, namely carboxylic acids, heterocyclics and heterocyclic carboxylic acids. Pyridine carboxylic acid belongs to heterocyclic carboxylic acid A kind of acid ligand, its advantage is that it has both the active sites of carboxylic acid O atom and heterocyclic N atom, and it is easy to form a rich spatial structure in the coordination reaction. However, two organic polycarboxylic acid anionic ligands are currently used There are few reports on three-dimensional coordination polymers formed with rare earths

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