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Pyridine acid type metal organic framework white light material and preparation method thereof

A metal-organic framework and dipicolinic acid technology, which is applied in the field of pyridine acid-based metal-organic framework white light materials and their preparation, can solve the problems of difficult and difficult preparation of white light materials, and achieve the improvement of luminous efficiency, reduction of synthesis cost and stability. good effect

Active Publication Date: 2018-06-22
CHENGDU UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The technical problem to be solved by the present invention is that the existing white light materials require the coordination and unification of various factors such as rare earth ions, organic ligands, substrates, dyes, etc., so it is very difficult. The purpose is to provide a pyridine acid metal organic framework white light material The preparation method solves the problem of difficult preparation of white light materials

Method used

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  • Pyridine acid type metal organic framework white light material and preparation method thereof
  • Pyridine acid type metal organic framework white light material and preparation method thereof
  • Pyridine acid type metal organic framework white light material and preparation method thereof

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Embodiment 1

[0037] A pyridine acid-based metal organic framework white light material of the present invention includes 2,3-pyridinedicarboxylic acid and dysprosium, 2,3-pyridinedicarboxylic acid is an organic ligand, and dysprosium is a rare earth metal; the dysprosium: 2,3 - The molar ratio of dipicolinic acid is 1:1-5; the optimum ratio of dysprosium:2,3-pyridinedicarboxylic acid is 1:3. The method for purifying the crude product in the step S2 includes: centrifuging the crude product successively, washing and drying for multiple times; the number of times of centrifugation is 3 times, each time 3 minutes; 3 to 5 times; the drying temperature is 60° C., and the drying time is 2 days.

[0038] The 2,3-pyridinedicarboxylic acid selected in the present invention is used as a small molecule organic ligand, and donors such as oxygen and nitrogen adopt a variety of different binding modes, tend to build a two-dimensional layered structure and contain co- Conjugate groups, and its metal node...

Embodiment 2

[0040] A method for preparing a pyridine acid metal organic framework white light material, comprising the following steps:

[0041]S1. Dissolve 2,3-pyridinedicarboxylic acid and dysprosium nitrate pentahydrate in a mixed solvent, mix them well, and conduct a closed reaction at a constant temperature of 90°C-150°C for 2d-4d to obtain a crude product;

[0042] S2. Purifying the crude product to obtain the pyridine acid metal organic framework white light material.

[0043] The molar ratio of dysprosium nitrate pentahydrate to 2,3-pyridinedicarboxylic acid is 1:3. The present invention has optimized the best proportioning ratio.

[0044] The mixed solvent is an organic solvent composed of DMF and absolute ethanol with a molar ratio of 1:1, and the molar ratio of the 2,3-pyridinedicarboxylic acid to the mixed solvent is: 0.0625-0.375:1. The present invention has optimized the best proportioning ratio.

[0045] The present invention uses dysprosium as a rare earth metal and 2,3...

Embodiment 3

[0047] Based on Example 2, gadolinium nitrate hexahydrate is also dissolved in the mixed solvent in step S1, 2,3-pyridinedicarboxylic acid, dysprosium nitrate pentahydrate, and gadolinium nitrate hexahydrate are dissolved in the mixed solvent, and dyes are added to the mixed solvent , the dye is 7-diethylamino-4-methylcoumarin. The ratio of the sum of the amounts of gadolinium nitrate hexahydrate and dysprosium nitrate pentahydrate to the amount of 2,3-pyridinedicarboxylic acid is 1:3. The method for purifying the crude product in the step S2 includes: centrifuging the crude product successively, washing and drying for multiple times; the number of times of centrifugation is 3 times, each time 3 minutes; 3 to 5 times; the drying temperature is 60° C., and the drying time is 2 days.

[0048] The multi-rare earth-organic framework structure used in the present invention has strong designability, and its large number of light-emitting sites improves the luminous efficiency, and ...

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Abstract

The invention discloses a pyridine acid type metal organic framework white light material and a preparation method thereof. The pyridine acid type metal organic framework white light material is prepared from 2,3-dipicolinic acid and dysprosium, wherein the 2,3-dipicolinic acid is an organic ligand; the dysprosium is rare earth metal. The preparation method of the pyridine acid type metal organicframework white light material comprises the following steps of dissolving 2,3-dipicolinic acid and dysprosium into a mixed solvent; after the uniform mixing, performing constant temperature sealed reaction for 2 d to 4 d at 90 to 150 DEG C to obtain a coarse product; purifying the coarse product to obtain the pyridine acid type metal organic framework white light material. The dysprosium is usedas the rare earth metal; the 2,3-dipicolinic acid is used as the organic ligand; the crystallization degree is high; the crystal dimension is large; the stability is high; the nonradiative jump probability is greatly reduced through pore passages, so that the common luminous intensity and luminous efficiency of various rare earth ions are enhanced; the thermal stability is improved.

Description

technical field [0001] The invention relates to a white light material and a preparation method thereof, in particular to a pyridine acid metal organic framework white light material and a preparation method thereof. Background technique [0002] In recent years, white light-emitting diodes (light emitting diodes, LED) are considered to be the next-generation lighting devices to replace traditional white woven lamps and fluorescent lamps due to their advantages such as low energy consumption, high luminous efficiency, strong brightness, and long life. Four generations of lighting sources, green light sources, and have been used in the field of general lighting. According to the preparation method, white light LEDs can be divided into: 1) red, green and blue (RGB) multi-chip combination white light LEDs and fluorescent down-conversion white light LEDs. Among them, fluorescent down-conversion white light LED has become the focus of the current white light LED industry develop...

Claims

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Application Information

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IPC IPC(8): C08G83/00C09K11/06
CPCC08G83/008C09K11/06C09K2211/182
Inventor 杜海英王有喜何小康王小明
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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