Rare earth metal organic framework material with high quantum yield and preparation method thereof
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An organic framework, rare earth metal technology, applied in the field of optical materials, can solve the problems of light emission easily affected by the environment, difficult to apply red light, etc.
Active Publication Date: 2018-11-30
SUN YAT SEN UNIV
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Although aggregation-induced luminescence increases the luminous intensity to a certain extent, it is difficult to apply this method to red light, mainly focusing on blue-green light, and the luminescence is easily affected by the environment.
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Embodiment 1
[0079] Embodiment 1 LMOF-1 synthetic method
[0080] Synthesis method of LMOF-1-Eu: 0.02 g ligand H 3 TATB (0.01 g of sodium nitrate can be added if the ligand removes a little salt impurity), 0.02 g of europium nitrate hexahydrate is added to a glass vial containing 4 ml of N,N dimethylacetamide solvent, and ultrasonicated for fifteen Minutes, add 0.2 ml of deionized water, and put it into a 120 degree oven for two days to react to obtain the desired material single crystal, with a yield of 0.021 g and a yield of 49%.
[0081] LMOF-1-Tb synthesis method: replace europium nitrate hexahydrate with terbium nitrate hexahydrate in the above method, and the rest are the same.
Embodiment 2
[0082] Embodiment 2 LMOF-2 synthesis method
[0083] Synthesis method of LMOF-2-Eu: 0.02 g ligand H 3 TATB, 0.02 grams of europium nitrate hexahydrate was added to a glass vial containing 4 milliliters of N,N dimethylacetamide solvent, ultrasonicated for 15 minutes, placed in an oven at 105 degrees Celsius, and 0.2 milliliters of deionized water was added after one day of reaction, and then in A single crystal of the desired material can be obtained after one day of reaction at 105 degrees Celsius. Yield 0.026 g, 67% yield.
[0084] LMOF-2-Tb - Synthetic method: replace europium nitrate hexahydrate with terbium nitrate hexahydrate in the above method, and the rest are the same.
Embodiment 3
[0085] Embodiment 3 LMOF-3-Eu synthesis method
[0086] LMOF-3-Eu synthesis method: 0.1 g of ligand H3TATB, 0.1 g of europium nitrate hexahydrate were added to a glass vial containing 3 ml of N,N dimethylacetamide and 3 ml of dimethyl sulfoxide solvent, and 0.3 ml water, sonicated for fifteen minutes, placed in a 90-degree Celsius oven, and reacted for three days to obtain material No. 3, with a yield of 0.019 grams and a yield of 50%.
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Abstract
The invention belongs to the field of luminescent materials, and relates to a rare earth metal organic framework material and a synthesis method thereof. The rare earth metal organic framework material is constructed with deprotoned 2,4,6-tris(4-carboxyphenyl)-1,3,5-triazine as ligands, with rare earth metal ions as luminescent centers by pi-pi interaction of the ligands or C-H-pi interaction of the ligands and a solvent. The distance between the centers of aromatic rings corresponding to the pi-pi interaction of the ligands is 5 Angstroms, the interaction of the ligand molecules is enhanced,the rigidity of a material skeleton is increased, the loss of energy on the skeleton is reduced, the energy transfer from the ligands to the rare earth metals is also enhanced, the energy utilizationefficiency is greatly enhanced, and thus high quantum yield is obtained. The luminescent metal organic frame material has high energy utilization rate, and the quantum yield of the luminescent metal organic frame material is increased from less than 60% to 99.9% compared with that of a conventional rare earth metal organic frame material.
Description
technical field [0001] The invention belongs to the field of optical materials, and relates to a rare earth metal organic frame fluorescent material and a method for synthesizing the material. Background technique [0002] Light-emitting diodes (LEDs), compared with ordinary incandescent bulbs and neon lamps, have many advantages such as energy saving and environmental protection, low working voltage, low current, small quality, high reliability, small size, long life, and good adjustability. , are widely used in the light source of the lighting device and the backlight source of the liquid crystal display device. [0003] Existing white light LEDs generally use blue light LEDs (which can emit blue light of one or more wavelengths in the range of about 450nm to 475nm) to excite the yellow phosphor covering the surface, and the blue light itself is combined with the excited yellow light to produce white light. , examples of conventional yellow-emitting phosphors include YAG:...
Claims
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