CN113292580B - Preparation and application of blue-light-emitting high-quantum-yield copper bromide hybrid crystal - Google Patents

Preparation and application of blue-light-emitting high-quantum-yield copper bromide hybrid crystal Download PDF

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CN113292580B
CN113292580B CN202110668303.0A CN202110668303A CN113292580B CN 113292580 B CN113292580 B CN 113292580B CN 202110668303 A CN202110668303 A CN 202110668303A CN 113292580 B CN113292580 B CN 113292580B
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CN113292580A (en
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刘威
童话
黎海波
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Sun Yat Sen University
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Abstract

The invention belongs to the technical field of lighting fluorescent materials, and particularly relates to preparation and application of blue-light-emitting copper bromide hybrid crystal with high quantum yield 2 (tpp) 2 H 2 O has efficient blue light emission characteristics. Meanwhile, the crystal structure contains an anionic inorganic cluster coordinated with a neutral organic ligand, the internal quantum yield is up to 81%, and the structure contains an ionic bond, so that the stability of the hybrid compound is improved, and the hybrid compound can be applied to the preparation of solid-state light-emitting devices. In addition, the compound can be processed by solution and is easy to synthesize, the compound is an environment-friendly luminescent material with low cost and no rare earth element, and the structural design provides a new way for synthesizing a high-performance luminescent and stable copper halide hybrid compound.

Description

Preparation and application of blue-light-emitting high-quantum-yield copper bromide hybrid crystal
Technical Field
The invention belongs to the technical field of illumination fluorescent materials, and particularly relates to preparation and application of a blue-light-emitting copper bromide hybrid crystal with high quantum yield.
Background
As one of the fastest growing branches of solid state lighting technology, compact fluorescent lamps (fluorescent lamps) and light emitting diodes are gradually replacing traditional light sources due to their advantages in energy saving and environmental protection. Currently, commercial phosphors for solid state light emitting devices are commonly prepared based on rare earth elements, which have potential supply risks and cost problems due to their scarcity. Therefore, there is a need to develop a rare earth element-free illumination phosphor that can be applied to solid state illumination, which is environmentally friendly and is considered as a development direction of next-generation illumination technology.
At present, the copper halide hybrid structure crystal is a rare earth element-free lighting fluorescent material which is researched more. The copper halide hybrid structure crystal has a plurality of structural varieties due to the existence of various inorganic modules and organic ligands in the structure and the diversified coordination modes between the inorganic modules and the organic ligands. It can be classified into three types according to the kind of chemical bond: the first type is a neutral structure, wherein the inorganic component and the organic component are electrically neutral and uncharged, and no covalent bond is connected between the inorganic component and the organic component; the second type is an ionic structure, wherein inorganic components and organic components of the ionic structure are charged, but covalent bonds are not formed between the inorganic components and the organic components and are completely bonded by the ionic bonds; the third type is an AIO structure, when the organic ligand connected with the inorganic component through covalent bond is charged, the positive and negative ions in the hybrid structure are connected through covalent bond to form a permanent dipole, and the direct bonding of the inorganic component and the organic component has certain ionic bond components besides the covalent bond. Research on AIO compounds has shown that coordination bonds between ligand molecules and copper atoms are a key factor in the luminescence of these hybrid compounds.
The organic-inorganic hybrid structure in the copper halide hybrid structure crystal is relatively stable, but because there is no covalent bond between the copper atom and the organic ligand and there is no metal-ligand charge transfer (MLCT) process, it usually shows only weak luminescence, low luminescence intensity, and low internal quantum yield, and the stability is not guaranteed, so that its practical application is limited. Therefore, the development and design of the copper halide hybrid compound with high luminescence property and good stability has important application value.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention provides a preparation method of a copper bromide hybrid crystal, and a prepared copper halide hybrid compound, namely a copper bromide ionic compound (bz-ted) CuBr 2 (tpp) 2 H 2 O has high quantum yield and produces intense blue photoluminescence due to the presence of a metal-ligand charge transfer (MLCT) luminescence mechanism, and the combination of ionic and covalent bonds in the hybrid structure gives the compound strong luminescence, stability and solution-processibility.
In order to achieve the purpose, the invention adopts the technical scheme that:
a preparation method of blue light-emitting high quantum yield copper bromide hybrid crystal comprises the following steps:
s1, synthesis of bz-ted ligand: dissolving 1, 4-diazabicyclo [2, 2, 2] octane (Ted) in an organic solvent, adding benzyl bromide under the stirring condition, continuously stirring to form a white precipitate, and filtering, washing and drying to prepare the compound;
s2, copper bromide hybrid crystal (bz-ted) CuBr 2 (tpp) 2 H 2 And (3) synthesis of O: adding copper bromide, triphenylphosphine and a bz-ted ligand into an organic solvent, heating until colorless flaky crystals are separated out, and filtering, washing and drying to obtain the copper bromide-based catalyst.
The invention selects the coordination anion cluster CuBr 2 (tpp) 2 - As inorganic ligand, CuBr in ligand 2 - The anion coordinates to two neutral uncharged molecules of triphenylphosphine (tpp) via the cation bz-ted (1-benzyl-1, 4-diazabicyclo [2, 2- ] -bis]Octyl-1-onium) to CuBr 2 (tpp) 2 - After the cluster is surrounded, an ionic organic-inorganic hybrid structure (bz-ted) CuBr containing ionic bonds and coordinate bonds is formed 2 (tpp) 2 H 2 O (tpp: triphenylphosphine, bz-ted ═ 1-benzyl-1, 4-diazabicyclo [2, 2]Octa-1-ium). In this structure, the anionic cluster CuBr 2 (tpp) 2 - Containing copper-ligand coordination bonds, producing strong blue luminescence due to charge transfer between the ligand molecule and the metal; meanwhile, the ionic bond between the cation and anion substances improves the stability and solubility of the hybrid structure. Although the (bz-ted) CuBr synthesized in the present invention 2 (tpp) 2 H 2 O is also an ionic structure, but the existence of a covalent bond of copper-triphenylphosphine (Cu-tpp) enables the crystal to have an MLCT light-emitting mechanism, and an internal quantum yield of 81 percent is endowed.
Preferably, the molar ratio of the 1, 4-diazabicyclo [2, 2, 2] octane to benzyl bromide is 1: 1.
Preferably, the concentration of the 1, 4-diazabicyclo [2, 2, 2] octane in the organic solvent is 1mmol/(4-5) mL.
Preferably, the molar ratio of copper bromide, triphenylphosphine and bz-ted ligand is 1:1: 1.
Preferably, the concentration of the bz-ted ligand in the organic solvent is 1mmol/(20-25) mL.
Preferably, the organic solvent of step S1 includes, but is not limited to, acetone.
Preferably, the organic solvent in step S2 is a mixed solvent of dichloromethane and toluene, and the volume ratio of dichloromethane to toluene is 1: 1.
preferably, the heating temperature of step S2 is 70-90 ℃. Further, the temperature of the heating was 80 ℃.
Preferably, the washing in step S1 is three times with ethyl acetate; the washing in step S2 is three times with acetonitrile.
The invention also provides the blue-light-emitting copper bromide hybrid crystal with high quantum yield, which is prepared by the preparation method.
The invention also provides application of the blue light-emitting high-quantum-yield copper bromide hybrid crystal in preparation of a solid-state light-emitting device.
Compared with the prior art, the invention has the beneficial effects that:
the invention synthesizes a novel cupric bromide ion organic-inorganic hybrid structure, namely copper bromide hybrid crystal (bz-ted) CuBr 2 (tpp) 2 H 2 O, the crystal has efficient blue light emission characteristics. Meanwhile, the crystal structure contains an anionic inorganic cluster coordinated with a neutral organic ligand, the internal quantum yield is up to 81%, and the structure contains an ionic bond, so that the stability of the hybrid compound is improved, and the hybrid compound can be applied to the preparation of solid-state light-emitting devices. In addition, the compound can be processed by solution and is easy to synthesize, the compound is an environment-friendly luminescent material with low cost and no rare earth element, and the structural design provides a new way for synthesizing a high-performance luminescent and stable copper halide hybrid compound.
Drawings
FIG. 1 is (bz-ted) CuBr 2 (tpp) 2 H 2 Powder X-ray diffraction spectrogram of O crystal (upper: actual measurement spectrum of crystal obtained by actual preparation, lower: calculation spectrum of simulated crystal structure);
FIG. 2 is (bz-ted) CuBr 2 (tpp) 2 H 2 Fluorescence spectrum of O crystal at room temperature (left: excitation spectrum, right: emission spectrum; excitation wavelength 360nm, emission wavelength 430 nm).
Detailed Description
The following further describes the embodiments of the present invention. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
The experimental procedures in the following examples were carried out by conventional methods unless otherwise specified, and the test materials used in the following examples were commercially available by conventional methods unless otherwise specified.
EXAMPLE 1 copper bromide hybrid Crystal (bz-ted) CuBr 2 (tpp) 2 H 2 Synthesis of O
(1) Synthesis of 1-benzyl-1, 4-diazabicyclo [2, 2, 2] oct-1-ium (bz-ted ligand):
dissolving 1.12g of 1, 4-diazabicyclo [2, 2, 2] octane (Ted) (10mmol) in 50mL of acetone, adding 1.71g of benzyl bromide (10mmol) under magnetic stirring, continuing stirring for 5-10 minutes to form a white precipitate, collecting the precipitate by suction filtration, washing with ethyl acetate for three times, and finally drying in vacuum to obtain 2.23g of a bz-Ted ligand product;
(2)(bz-ted)CuBr 2 (tpp) 2 H 2 and (3) synthesis of O crystals:
0.29g of copper bromide (2mmol), 0.5g of triphenylphosphine (2mmol) and 0.19g of bz-ted ligand (2mmol) were added to 50mL of a mixed solvent of dichloromethane and toluene (volume ratio 1: 1), heated overnight at 80 ℃ to precipitate colorless plate crystals, collected by suction filtration, washed three times with acetonitrile, and finally dried in vacuum to obtain 0.15g of a product.
Pair of (bz-ted) CuBr by Bingson photonics C9920-03 absolute quantum yield measurement system 2 (tpp) 2 H 2 The O crystal was measured to obtain an internal quantum yield of 81%.
Meanwhile, the crystal is also found to have solution processability, namely, the crystal can be dissolved in common organic solvents, such as methanol, dimethyl sulfoxide and the like. Under sonication at room temperature, about 100mg of the product can be completely dissolved in 1mL of dimethyl sulfoxide within 5 minutes, and the sample can be recrystallized by gently heating the solution until it dries out.
High by Bruk D8(bz-ted) CuBr prepared by order auto-diffraction system 2 (tpp) 2 H 2 The O crystal was subjected to powder X-ray diffraction analysis at a working power of 40kV/40mA using copper ka 1 radiation (λ ═ 1.54056), and data were obtained at room temperature in the 2 θ range of 3 to 50 ° at a scanning speed of 1 °/min, and the experimental results are shown in fig. 1. The upper line in the figure is the powder X-ray diffraction spectrum of the crystal actually prepared, and the lower line is the powder X-ray diffraction spectrum calculated by simulating the crystal structure. From the figure, it can be observed that the actual peak position coincides with the simulated peak position, indicating that a pure phase is obtained.
(bz-ted) CuBr thus prepared was subjected to an Edinburgh apparatus FLS1000 spectrofluorometer 2 (tpp) 2 H 2 The O crystal was subjected to fluorescence spectroscopy measurement at room temperature with an excitation wavelength of 360nm, and the experimental results are shown in fig. 2. As can be seen from FIG. 2, the fluorescence spectrum of the crystal under excitation at room temperature and at the wavelength of 360nm shows strong blue emission with a full width at half maximum of about 75nm and an emission peak at 430nm, and the high-energy deep blue emission is very rare in a hybrid structure based on copper halide.
Example 2 copper bromide hybrid Crystal (bz-ted) CuBr 2 (tpp) 2 H 2 Synthesis of O
(1) Synthesis of 1-benzyl-1, 4-diazabicyclo [2, 2, 2] oct-1-ium (bz-ted ligand):
dissolving 0.65g of 1, 4-diazabicyclo [2, 2, 2] octane (Ted) (5mmol) in 20mL of acetone, adding 0.85g of benzyl bromide (5mmol) under magnetic stirring, continuously stirring for 5-10 minutes to form white precipitate, collecting the precipitate by suction filtration, washing with ethyl acetate for three times, and finally drying in vacuum to obtain 1.19g of a bz-Ted ligand product;
(2)(bz-ted)CuBr 2 (tpp) 2 H 2 and (3) synthesis of O crystals:
0.14g of copper bromide (1mmol), 0.25g of triphenylphosphine (1mmol) and 0.95g of bz-ted ligand (1mmol) are added into a mixed solvent of 20mL of dichloromethane and toluene (volume ratio 1: 1), heated overnight at 80 ℃, colorless plate crystals are separated out, collected by suction filtration, washed three times with acetonitrile, and finally dried in vacuum to obtain 0.07g of a product.
Pair of (bz-ted) CuBr by Bingson photonics C9920-03 absolute quantum yield measurement system 2 (tpp) 2 H 2 The O crystal was measured to obtain an internal quantum yield of 81%. Meanwhile, the crystal also has solution-processibility.
The results of powder X-ray diffraction analysis and fluorescence spectrum measurement of the crystal were in accordance with example 1.
Example 3 copper bromide hybrid Crystal (bz-ted) CuBr 2 (tpp) 2 H 2 Synthesis of O
(1) Synthesis of 1-benzyl-1, 4-diazabicyclo [2, 2, 2] oct-1-ium (bz-ted ligand):
dissolving 0.37g of 1, 4-diazabicyclo [2, 2, 2] octane (Ted) (3mmol) in 15mL of acetone, adding 0.57g of benzyl bromide (3mmol) under magnetic stirring, continuously stirring for 5-10 minutes to form a white precipitate, collecting the precipitate by suction filtration, washing with ethyl acetate for three times, and finally drying in vacuum to obtain 0.70g of a bz-Ted ligand product;
(2)(bz-ted)CuBr 2 (tpp) 2 H 2 and (3) synthesis of O crystals:
0.07g of copper bromide (0.5mmol), 0.25g of triphenylphosphine (0.5mmol) and 0.47g of bz-ted ligand (0.5mmol) were added to a mixed solvent of 12mL of dichloromethane and toluene (volume ratio: 1), heated overnight at 80 ℃ to precipitate colorless plate-like crystals, which were collected by suction filtration, washed three times with acetonitrile, and finally dried under vacuum to obtain 0.04g of a product.
Pair of (bz-ted) CuBr by Bingson photonics C9920-03 absolute quantum yield measurement system 2 (tpp) 2 H 2 The O crystal was measured to obtain an internal quantum yield of 80%. Meanwhile, the crystal also has solution-processibility.
The results of powder X-ray diffraction analysis and fluorescence spectrum measurement of the crystal were in accordance with example 1.
The embodiments of the present invention have been described in detail, but the present invention is not limited to the described embodiments. It will be apparent to those skilled in the art that various changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, and the scope of protection is still within the scope of the invention.

Claims (5)

1. A preparation method of blue light-emitting copper bromide hybrid crystal is characterized by comprising the following steps:
s1, synthesis of bz-ted ligand: dissolving 1, 4-diazabicyclo [2, 2, 2] octane in an organic solvent, adding benzyl bromide under the stirring condition, wherein the molar ratio of the 1, 4-diazabicyclo [2, 2, 2] octane to the benzyl bromide is 1:1, the concentration of the 1, 4-diazabicyclo [2, 2, 2] octane in the organic solvent is 1mmol/(4-5) mL, continuously stirring to form a white precipitate, and filtering, washing and drying to prepare the product;
s2, synthesis of copper bromide hybrid crystal: adding copper bromide, triphenylphosphine and a bz-ted ligand into an organic solvent, wherein the molar ratio of the copper bromide to the triphenylphosphine to the bz-ted ligand is 1:1:1, the concentration of the bz-ted ligand in the organic solvent is 1mmol/(20-25) mL, heating until colorless flaky crystals are separated out, filtering, washing and drying to obtain copper bromide hybrid crystals, wherein the heating temperature is 70-90 ℃, and the chemical formula of the copper bromide hybrid crystals is (bz-ted) CuBr 2 (tpp) 2 H 2 O。
2. The method for preparing blue-emitting copper bromide hybrid crystal according to claim 1, wherein the organic solvent in step S1 comprises acetone.
3. The method for preparing the blue-light-emitting copper bromide hybrid crystal according to claim 1, wherein the organic solvent in step S2 is a mixed solvent of dichloromethane and toluene, and the volume ratio of dichloromethane to toluene is 1: 1.
4. blue light-emitting copper bromide hybrid crystals prepared by the preparation method of any one of claims 1-3.
5. Use of the blue-emitting copper bromide hybrid crystal according to claim 4 in the preparation of a solid-state light-emitting device.
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CN109311913A (en) * 2016-05-25 2019-02-05 新泽西鲁特格斯州立大学 Synthesis and manufacture have the method based on precursor of high-quantum efficiency and the mixed luminescence phosphor of the light and heat stability significantly increased
CN110785424A (en) * 2017-05-04 2020-02-11 新泽西鲁特格斯州立大学 Luminescent and dispersible hybrid materials incorporating ionic and coordinate bonds in molecular crystals

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CN109311913A (en) * 2016-05-25 2019-02-05 新泽西鲁特格斯州立大学 Synthesis and manufacture have the method based on precursor of high-quantum efficiency and the mixed luminescence phosphor of the light and heat stability significantly increased
CN110785424A (en) * 2017-05-04 2020-02-11 新泽西鲁特格斯州立大学 Luminescent and dispersible hybrid materials incorporating ionic and coordinate bonds in molecular crystals

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