Blue fluorescent powder for white-light LED and preparation method thereof

A technology of blue phosphor and white light, applied in the field of blue phosphor for white light LED and its preparation, can solve the problems of low purity and luminous performance of phosphor, complicated spray pyrolysis process, and difficulty in large-scale production, etc. Good chemical stability and thermal stability, shortened chemical reaction time, the effect of short time

Inactive Publication Date: 2010-06-16
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, due to the high cost of the sol-gel method, it is difficult to achieve large-scale production; the phosphor powder prepared by the combustion method has low purity and luminescent performance; the spray pyrolysis method has complicated processes and high equipment requirements, making it difficult to industrialize production
Therefore, high-temperature solid-phase method is often used in industry. Although it has the advantages of simple process and low cost, the prepared phosphor still has problems such as phase impurities, poor luminescent performance, and coarse crystal grains.

Method used

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  • Blue fluorescent powder for white-light LED and preparation method thereof
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  • Blue fluorescent powder for white-light LED and preparation method thereof

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Experimental program
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Effect test

Embodiment 1

[0025] According to the chemical formula Ca 0.98 SiO 3 :0.02Eu 2+ Weigh Ca(NO 3 ) 2 4H 2 O(A.R.)0.98mol, H 2 SiO 3 (A.R.)1mol and Eu(NO 3 ) 3 ·6H 2 O (A.R.) 0.02mol; Take by weighing respectively 0.1wt% surfactant sodium dodecylbenzene sulfonate and flux H of the total mass of the above medicines 3 BO 3 ; Will weigh the good Ca (NO 3 ) 2 4H 2 O, H 2 SiO 3 , Eu(NO 3 ) 3 ·6H 2 O, surfactant and ligand NH 4 HCO 3 (The ratio of the reactant to the ligand is 1:3), and then ball milling is carried out. During the ball milling, the lubricant acetone is added, and the amount of the lubricant added is limited to be kept dispersed by the ball milling system until the reactant and the ligand are completely reacted; Suction filtration, washing, and drying to obtain the precursor powder; after mixing the precursor powder and flux uniformly, calcining under the reducing atmosphere provided by the combustion of activated carbon powder, the calcining temperature is 1250°C,...

Embodiment 2

[0027] According to the chemical formula Ca 0.96 SiO 3 :0.04Eu 2+ Weigh Ca(NO 3 ) 2 4H 2 O(A.R.)0.96mol, H 2 SiO 3 (A.R.)1mol and Eu(NO 3 ) 3 ·6H 2 O (A.R.) 0.04mol; Take by weighing respectively the surfactant sodium dodecylbenzene sulfonate of 0.4wt% of the total mass of the above medicines and the mixed flux H 3 BO 3 and MgF 2 (the mixing mass ratio is 1:1); the Ca(NO 3 ) 2 4H 2 O, H 2 SiO 3 , Eu(NO 3 ) 3 ·6H 2 O, surfactants and ligands (NH 4 ) 2 CO 3 (The ratio of the reactant to the ligand is 1:2) and then ball milled. Add lubricant acetone during ball milling. The amount of lubricant added is limited to be kept dispersed by the ball milling system until the reactant and the ligand are completely reacted; Suction filtration, washing, and drying to obtain the precursor powder; after mixing the precursor powder and flux uniformly, calcining under the reducing atmosphere provided by the combustion of activated carbon powder, the calcining temperature i...

Embodiment 3

[0029] According to the chemical formula Ca 0.94 SiO 3 :0.06Eu 2+ Weigh Ca(NO 3 )2 4H 2 O(A.R.)0.94mol, H 2 SiO 3 (A.R.)1mol and Eu(NO 3 ) 3 ·6H 2 O (A.R.) 0.06mol; Take by weighing respectively the surfactant sodium dodecylbenzene sulfonate of 0.7wt% of the total mass of the above medicines and the mixed flux H 3 BO 3 and Li 2 CO 3 (the mixing mass ratio is 1:1); the Ca(NO 3 ) 2 4H 2 O, H 2 SiO 3 , Eu(NO 3 ) 3 ·6H 2 O, surfactant and ligand C 2 h 2 o 4 (The ratio of the reactant to the ligand is 1:2) and then ball milled. Add lubricant acetone during ball milling. The amount of lubricant added is limited to be kept dispersed by the ball milling system until the reactant and the ligand are completely reacted; Suction filtration, washing, and drying to obtain the precursor powder; after mixing the precursor powder and flux uniformly, calcining under the reducing atmosphere provided by the combustion of activated carbon powder, the calcining temperature is ...

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Abstract

The invention relates to blue florescent powder for a white-light LED, belonging to the technical field of rare earth luminescent materials. The blue florescent powder has a chemical formula of: Ca<1-x>SiO3:xEu2+, wherein x is more than 0 and less than 0.2. The preparation method comprises the following steps of: respectively weighing calcium salts, silicic acid, europium nitrate and an appropriate amount of surfactant and fluxing agent according to the stoichiometric ratio in the chemical formula; fully mixing the weighed reactant, the surfactant and an appropriate amount of ligands and then ball-milling, and adding a lubricating agent when in ball-milling; filtering, washing and drying to obtain a precursor; evenly mixing the precursor with the fluxing agent, and then calcining under the reducing atmosphere to obtain the required florescent powder. In the invention, the blue florescent powder for the LED is prepared by adopting a mechanical force solid-phase chemical reaction method, the specific surface area of the reactant is increased by utilizing the shearing force and the impact force generated in the ball-milling process, the contact face and the diffusion speed of the reactant are improved, and the required time in the chemical reaction is shortened. The prepared fluorescent powder has high luminescent strength as well as good color rendering property and stability, and is suitable for LEDs excited by ultraviolet and near ultraviolet.

Description

1. Technical field [0001] The invention belongs to the technical field of rare earth luminescent materials, and in particular relates to a blue fluorescent powder for white LEDs and a preparation method thereof. 2. Background technology [0002] Due to their special electronic layer structure, rare earth elements make the compounds containing rare earth elements exhibit many unique chemical and physical properties, so they are widely used in the fields of optics, electricity, and magnetism. Rare earth luminescent materials are widely used in display, lighting, imaging, and radiation fields due to their narrow emission spectrum band, high color purity, high light conversion efficiency, fluorescence lifetime spanning from nanoseconds to milliseconds up to 6 orders of magnitude, and stable physical and chemical properties. , medical radiology images, coatings and anti-counterfeiting marks and other fields. [0003] In the field of lighting, white light LED is considered to be ...

Claims

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Application Information

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IPC IPC(8): C09K11/59
CPCY02B20/181Y02B20/00
Inventor 朱达川马明星涂铭旌
Owner SICHUAN UNIV
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