Blue-light-emitting fluorescent material and preparation method thereof
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A technology of fluorescent materials and luminescent properties, applied in the field of fluorescent materials, can solve the problems of weak absorption, unfavorable environmental protection and health, poor stability of aluminate phosphors, etc., and achieves good film-forming properties, good blue light emission properties, The effect of good photoelectric activity
Inactive Publication Date: 2011-07-20
NINGBO UNIV
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Toxic Be compounds are used in the preparation process of the phosphor, which is not conducive to environmental protection and health
Chinese patent CN1408811A discloses a boroaluminate blue fluorescent powder for color plasma flat display and its manufacturing method, but the fluorescent powder only has strong absorption in the short-wave ultraviolet region, and weak absorption in the long-wave ultraviolet region
Chinese patent CN1415695A discloses a preparation method of blue aluminate phosphor activated by vacuum ultraviolet rays. The stability of this aluminate phosphor is not good, and its maximum excitation peak is in the short-wave ultraviolet region
Chinese patent CN1128785A discloses a blue phosphor powder for trichromatic fluorescent lamps. Its chemical composition is calcium strontium barium chloride phosphate activated by europium. Due to its weak absorption in the long-wave ultraviolet region, it is also not suitable as a UV-activated photochromic fluorescent material.
Therefore, in the preparation of blue organic light-emitting materials, d 10 The tunability of metal ions and carboxylic acid-containing ligands in metal complexes is very challenging to design and synthesize efficient blue organic light-emitting materials
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Embodiment 1
[0018] Add orotic acid (0.5mmol, 0.85g) in 50mL beaker, cadmium sulfate (0.6mmol, 0.462g), o-phenanthroline (0.2mmol, 0.04g), add 10mL ethanol and 20mL water, stir at room temperature Add triethylamine dropwise, adjust the pH value to 5, and leave it at room temperature for 12 hours to obtain colorless blocky crystals.
Embodiment 2
[0020] Add orotic acid (0.6mmol, 1.02g) in 50mL beaker, cadmium sulfate (0.7mmol, 0.539g), o-phenanthroline (0.3mmol, 0.06g), add 10mL ethanol and 20mL water, stir at room temperature Add triethylamine dropwise, adjust the pH value to 6, and leave it at room temperature for 24h to obtain colorless blocky crystals.
Embodiment 3
[0022] In the 50mL beaker, add orotic acid (0.7mmol, 119g), cadmium sulfate (0.8mmol, 0.616g), o-phenanthroline (0.4mmol, 0.08g), add 10mL ethanol and 20mL water, under the condition of stirring at room temperature , adding triethylamine dropwise, adjusting the pH value to 7, and standing at room temperature for 48h to obtain colorless blocky crystals.
[0023] The colorless massive crystal obtained in the above-mentioned examples is rinsed with distilled water, and air-dried naturally; After determination, the molecular formula of this cadmium orotic acid compound is C 88 h 64 N 8 o 12 Cd 2 . The crystal system is triclinic, the space group is P-1, and the unit cell parameters α=73.082°, γ=78.073°, β=81.100°, the cadmium ion is a pentagonal bipyramidal coordination mode, two nitrogen coordination atoms are from o-phenanthroline, and three oxygen coordination atoms are from orotic acid, The two oxygen coordinating atoms come from water. Its crystal structure is s...
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Abstract
The invention discloses a blue-light-emitting fluorescent material and a preparation method thereof. The invention is characterized in that the fluorescent material is a cadmium compound of orotic acid, which is prepared by carrying out chemical reaction on orotic acid with carboxylic acid, phenanthroline and cadmium ions with optical activity; the molecular formula of the fluorescent material is C44H52N12O28Cd2, the crystal system is triclinic, and the space group is P-1; and the cell parameters are as follows: a=9.5220 Angstroms, b=11.8790 Angstroms, c=12.6141 Angstroms, alpha=73.082 degrees, gamma=78.073 degrees, and beta=81.100 degrees. The cadmium ions are in a pentagonal bipyramidal coordination mode, two nitrogen coordinating atoms are from the phenanthroline, three oxygen coordinating atoms are from orotic acid, and two oxygen coordinating atoms are from water. The fluorescent material has the advantages of accurate space structure and accurate molecular formula, and contains abundant Cd(II) ions with optical activity and carboxylic acid with strong coordinating capacity, thereby being beneficial to electron transition and energy transmission. The fluorescent material has favorable photoelectric activity and favorable blue light emission performance.
Description
technical field [0001] The invention relates to a fluorescent material, in particular to a fluorescent material with blue light emitting performance and a preparation method thereof. Background technique [0002] Fluorescent materials usually refer to the ability to absorb and store energy after receiving external energy, and convert it into light energy in a dark place. It first came out in 1938. In the early days, Stokes et al. synthesized phosphors such as calcium tungstate and used them in fluorescent lamps. Phosphate phosphor was developed in 1948, and the luminous performance of this phosphor has been significantly improved compared with the early phosphor. Phosphor powder was widely used in the 1960s and 1970s. Introducing optically active metal ions or organic ligands containing conjugated units into fluorescent materials can greatly improve the luminescent properties of fluorescent materials. Compounds with strong fluorescent light-emitting ability have very imp...
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