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Multi-rare earth-organic frame material for white light emission and preparation method thereof

An organic framework, rare earth organic technology, applied in luminescent materials, chemical instruments and methods, sustainable architecture, etc., can solve the problems of complex process steps and high cost, and achieve the effects of simple process equipment, reduced synthesis cost, and good stability

Active Publication Date: 2018-02-16
CHENGDU UNIVERSITY OF TECHNOLOGY
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Problems solved by technology

[0005] "Eu 3+ -doped Tb 3+ metal–organic frameworks emitting tunable three primary colors towards white light”, Zhi-Fa Liu, Mei-Feng Wu, Shuai-Hua Wang.etal.J.Mater.Chem.C,2013,1,4634–4639. Disclosed a A metal-organic framework material that emits white light. The material has a two-dimensional structure, and its preparation method is divided into three steps. The first step is to synthesize [EuOH(H 2 O) 6 ][Zn 2 Eu 4 (4-Htbca) 2 -(4-tbca) 8 (H 2 O) 12 ]} n .6nH 2 O(1-Eu), the second step synthesis [TbOH(H 2 O) 6 ][Zn 2 Tb 4 (4-Htbca) 2 -(4-tbca) 8 (H 2 O) 12 ]} n .6nH 2 O(2-Tb), the third step, mixing the materials prepared in the first step and the second step to obtain a white light-emitting mixed material, the process steps are complicated and the cost is high

Method used

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  • Multi-rare earth-organic frame material for white light emission and preparation method thereof

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preparation example Construction

[0039] Further, the preparation method of the multi-rare earth organic framework material for white light emission comprises the following steps:

[0040] a. Dissolving 2,6-pyridinedicarboxylic acid, zinc salt, europium salt and terbium salt in a mixed solvent, mixing and reacting at a constant temperature of 90-100°C for 3-4 days to obtain a crude product;

[0041] b. Purifying the crude product to obtain a multi-rare earth organic framework material for white light emission;

[0042] Wherein, the molar ratio of the 2,6-pyridinedicarboxylic acid: zinc salt: europium salt: terbium salt is: 1.8:0.54~0.55:0.04~0.05:0.01~0.02; the mixed solvent is an organic solvent and water according to volume A mixed solution with a ratio of 1 to 2:1, the organic solvent is ethanol or DMF, and the organic solvent is preferably non-toxic, environmentally friendly ethanol.

[0043] Among them, the constant temperature closed reaction prevents the evaporation of ethanol and distilled water and a...

Embodiment 1

[0058] 1.8mmol of 2,6-dipicolinic acid ligand, 0.540mmol of zinc nitrate hexahydrate, 0.048mmol of europium nitrate hexahydrate and 0.012mmol of terbium nitrate hexahydrate were dissolved in a mixed solvent of 10ml ethanol and 10ml water, and After stirring the glass rod evenly, put it into a closed reaction kettle, and react at a constant temperature of 90-100°C for 3 days. After the reaction, the sample was centrifuged, and the sample was washed 3 times with a mixed solvent of absolute ethanol and water with a volume ratio of 1:1, and after drying, the multi-rare earth-organic framework material with zinc as the matrix was obtained, and its emission spectrum was as shown in the figure, Chromaticity coordinate diagram, RXRD diagram, SEM diagram, IR diagram, TG diagram are as follows figure 1 , 2 , 3, 4, and 5.

[0059] When the excitation wavelength is 325nm, the maximum peaks of the emission spectrum are located at 410nm, 550nm and 617nm respectively. The luminescence of t...

Embodiment 2

[0061] Dissolve 1.8mmol of 2,6-dipicolinic acid ligand, 0.540mmol of zinc salt zinc nitrate hexahydrate, 0.046mmol of europium salt of europium nitrate hexahydrate and 0.014mmol of terbium salt of terbium nitrate hexahydrate in 10ml of ethanol and 10ml of water Mixed solvent with a glass rod, then put it into a closed reaction kettle, and react at a constant temperature of 90-100°C for 3 days. After the reaction, the sample was centrifuged, washed three times with a mixed solvent of absolute ethanol and water with a volume ratio of 1:1, and dried to obtain a zinc-based polyrare earth-organic framework material.

[0062] When the excitation wavelength is 325nm, the maximum peaks of the emission spectrum are located at 410nm, 550nm and 617nm, respectively. The phosphor emits white light, and its color coordinates are (0.3155, 0.3101).

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Abstract

Belonging to the technical field of luminescent materials, the invention relates to a multi-rare earth-organic frame material and a preparation method thereof. The multi-rare earth-organic frame material for white light emission adopts 2, 6-pyridinedicarboxylic acid as the organic ligand, takes metal zinc as the matrix, and employs europium and terbium for codoping. The invention groundbreakinglyuses metal zinc as the matrix in the white light-emitting MOFs (metal-organic frameworks) material adopting 2, 6-pyridinedicarboxylic acid as the organic ligand, and employs europium and terbium codoping to prepare the white light-emitting multi-rare earth-organic frame material, the luminous intensity is strengthened, and the stability is better. The invention also successfully adopts the one-step synthesis method to prepare the multi-rare earth-organic frame material. Compared with the existing synthesis of multi-rare earth-organic frame materials, the steps are simpler and the efficiency ishigh, the process equipment for preparation of the material is also simple, and the material synthesis cost is greatly reduced.

Description

technical field [0001] The invention relates to a multi-rare earth-organic framework material and a preparation method thereof, belonging to the technical field of luminescent materials. Background technique [0002] The application of luminescent materials in many fields such as fluorescent lamps, plasma flat panel displays, optical switches, and light-emitting diodes has made it a research hotspot in the international forefront in the past ten years. Designing and developing luminescent materials with long life, low energy consumption and high efficiency is the goal pursued by many physicists and chemists. The advantages of small size, low heat generation, low power consumption, and long life make white LEDs a new generation of energy-saving light sources. The traditional LED white light phosphor is a combination of phosphors of various colors, and there is no single phosphor. Moreover, traditional phosphors have disadvantages such as low color rendering index, low color...

Claims

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Application Information

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IPC IPC(8): C08G83/00C09K11/06
CPCC08G83/008C09K11/06C09K2211/182C09K2211/188Y02B20/00
Inventor 张佩聪周敬修邱克辉杜海英黄艺倪师军李峻峰张文涛高庆王甜巨力黄滔滔
Owner CHENGDU UNIVERSITY OF TECHNOLOGY
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