A method for improving the luminous efficiency of europium complexes

A technology of complexes and ligands, which can be applied to luminescent materials, compounds containing Group 3/13 elements of the periodic table, and Group 3/13 organic compounds without C-metal bonds, etc., which can solve problems such as low metal ion efficiency , to achieve the effect of simple fluorescence efficiency, simple and fast synthesis method, and high yield

Active Publication Date: 2020-08-11
XUZHOU NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Direct excitation of these metal ions is inefficient unless excited by high-energy lasers

Method used

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  • A method for improving the luminous efficiency of europium complexes
  • A method for improving the luminous efficiency of europium complexes
  • A method for improving the luminous efficiency of europium complexes

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Rare earth-organic complexes [Na 2 Eu 2 (qc) 6 (CH 3 COO) 2 (H 2 O) 4 ] . 2DMF and [Eu 2 (qc) 6 (H 2 O) 6 ]. 3H 2 Synthesis of O

[0020] Weigh the ligand quinoline-2-carboxylic acid Hqc 40 mg, europium acetate Eu(CH 3 COO) 3 . 6H 2 O 180 mg, sodium ethoxide CH 3 CH 2 ONa 41 mg in a 50 ml Erlenmeyer flask, add 20 ml of ethanol C to this mixture 2 h 5 Oh. After ultrasonication for 10 minutes and uniform mixing, the Erlenmeyer flask containing the reaction substance was placed on a magnetic stirrer and stirred at room temperature for 24 hours. Filter the above mixture, and the filtrate obtained is volatilized at room temperature to obtain colorless rhombohedral crystals [Eu 2 (qc) 6 (H 2 O) 6 ] . 3H 2 O. Dilute the filter residue obtained by the above filtration with 10 ml N,N-dimethylformamide DMF and 3 ml water H 2 O is heated and dissolved, and a colorless cube-shaped single crystal product [Na 2 Eu 2 (qc) 6 (CH 3 COO) 2 (H 2 O) 4 ] ...

Embodiment 2

[0022] Rare earth-organic complexes [Na 2 Eu 2 (qc) 6 (CH 3 COO) 2 (H 2 O) 4 ] . 2DMF and [Eu 2 (qc) 6 (H 2 O) 6 ] . 3H 2 The structure and difference of O

[0023] Complex [Na 2 Eu 2 (qc) 6 (CH 3 COO) 2 (H 2 O) 4 ] . The single crystal structure of 2DMF was obtained by the Saturn724+ CCD of Japan Rigaku X - Measured by X-ray single crystal diffractometer. The crystal structure was analyzed and determined using the program Shexl 2014. Complex [Na 2 Eu 2 (qc) 6 (CH 3 COO) 2 (H 2 O) 4 ] . 2DMF crystallized in P 2 1 / c space group, monoclinic crystal system. There is one europium ion Eu in the asymmetric unit 3+ , three deprotonated quinoline-2-carboxylic acid ligands qc - , a sodium ion Na + , both with Na + Ionically coordinated water molecule H 2 O, a coordinated acetate with ion CH 3 COO - and a molecule of N,N-dimethylformamide DMF in a lattice. Eu 3+ The ions have a nine-coordinated geometry. The nine coordinating atoms are four qc...

Embodiment 3

[0025] Rare earth-organic complexes [Na 2 Eu 2 (qc) 6 (CH 3 COO) 2 (H 2 O) 4 ] . The purity and stability of 2DMF

[0026] The purity of the complex was determined using a Japanese Rigaku DMAX-2500 copper rake X - Measured by X-ray powder diffractometer. The simulated powder diffraction pattern is consistent with the reagent diffraction pattern of the sample, which proves the high purity of the prepared complex. In addition, the thermal stability of the complex was measured and characterized by the STA-449C thermogravimetric analyzer of the German NETZSCH company. The complex has certain thermal stability below 300°C and can maintain the stability of the molecular skeleton.

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Abstract

The invention discloses a method for improving the luminous efficiency of complexes of europium. The method comprises the following steps: putting ligands such as quinoline-2-carboxylic acid, europium acetate and sodium ethoxide into a reactor, adding ethanol into the reactor, carrying out ultrasonic treatment for 5 to 15 minutes and uniformly mixing; then putting the reactor on a magnetic stirrer and then stirring at normal temperature for 18 to 30 hours; filtering a mixture, and heating and dissolving filtering residues with N,N-dimethylformamide (DMF) and water (H2O); then volatilizing the mixture at the normal temperature to obtain a colorless and cubic single crystal product [Na2Eu2(qc)6(CH3COO)2(H2O)4].2DMF. The method for improving the luminous efficiency of the complex of the europium, disclosed by the invention, has the advantages that simplicity and easiness in operation are realized; coordination spheres of europium ions can be protected effectively from being affected by water molecules, and the quantum yield of the complexes is increased by five times.

Description

technical field [0001] The invention belongs to the field of high molecular polymers, and in particular relates to a method for improving the luminous efficiency of europium complexes. Background technique [0002] Due to the unique optical, electrical and magnetic properties of rare earth elements, they have become "industrial catalysts" for the development of various new functional materials. As early as the 1960s, rare earth luminescent materials have attracted widespread attention as laser materials. With the deepening of research, the properties of rare earth luminescent materials are becoming more and more familiar to people, and their applications are becoming more and more extensive. my country is a country with a large amount of rare earth resources and has quite rich reserves of rare earth metals. After the 1990s, the technology of rare earth organic light-emitting materials has become more mature. With strong luminous efficiency and stable physical and chemical p...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C07F19/00C07F5/00C09K11/06C08G83/00
CPCC07F5/003C08G83/008C09K11/06C09K2211/181C09K2211/182
Inventor 盖艳丽孟庆华韩京郑维维李晨媛陈燕李鑫
Owner XUZHOU NORMAL UNIVERSITY
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