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A kind of red fluorescent powder with high doping concentration and preparation method thereof

A technology of red phosphor and high doping concentration, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of expensive rare earth elements, low quenching concentration, and poor thermal stability.

Active Publication Date: 2016-05-11
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

such as Y 2 o 3 :Eu 3+ and Y 2 o 2 S:Eu 3+ The main components of phosphors are expensive rare earth elements, among which Y 2 o 2 S:Eu 3+ There is also the problem of poor heat resistance stability, color drift will occur after long-term use, and its quenching concentration is low (about 1%). Therefore, it is necessary to find a high-efficiency and stable red fluorescent light for LEDs. of

Method used

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  • A kind of red fluorescent powder with high doping concentration and preparation method thereof
  • A kind of red fluorescent powder with high doping concentration and preparation method thereof

Examples

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Embodiment 1

[0019] Weigh Ca(NO 3 ) 2 4H 2 O (analytical pure) 0.647g, Sr (NO 3 ) 2 (Analytical Pure) 0.387g, (NH 4 ) 6 Mo 7 o 24 4H 2 O (analytical pure) 0.806g, the above-mentioned raw materials are accurately weighed. Then, various nitrates and ammonium molybdate tetrahydrate are dissolved in deionized water. For nitrates with low solubility, a small amount of dilute nitric acid can be added dropwise to the solution to promote dissolution, while stirring with a magnetic stirrer. After it is completely dissolved, add 1mol / L sodium hydroxide solution or potassium hydroxide solution dropwise to the clear liquid, adjust the pH value to 9-10, stop adding lye, continue stirring and add heat for 30 minutes (the purpose is to ensure that the precipitation reaction is complete), molybdate precipitation no longer increases, stop stirring and heating. After the particle precipitate in the solution is completely precipitated, remove the supernatant, add 250ml of deionized water to wash, a...

Embodiment 2

[0022] Weigh Ca(NO 3 ) 2 4H 2 O (analytical pure) 0.413g, Sr (NO 3 ) 2 (Analytical pure) 0.556g, (NH 4 ) 6 Mo 7 o 24 4H 2 O (analytically pure) 0.772g, the above raw materials are accurately weighed. Then, various nitrates and ammonium molybdate tetrahydrate are dissolved in deionized water. For nitrates with low solubility, a small amount of dilute nitric acid can be added dropwise to the solution to promote dissolution, while stirring with a magnetic stirrer. After it is completely dissolved, add 1mol / L sodium hydroxide solution or potassium hydroxide solution dropwise to the clear liquid, adjust the pH value to 9-10, stop adding lye, continue stirring and add heat for 30 minutes (the purpose is to ensure that the precipitation reaction is complete), molybdate precipitation no longer increases, stop stirring and heating. After the particle precipitate in the solution is completely precipitated, remove the supernatant, add 250ml of deionized water to wash, and repea...

Embodiment 3

[0025] Weigh Ba(NO 3 ) 2 (Analytical pure) 0.848g, Sr(NO 3 ) 2 (Analytical pure) 0.458g, (NH 4 ) 6 Mo 7 o 24 4H 2 O (analytical pure) 0.955g, the above-mentioned raw materials are accurately weighed. Then, various nitrates and ammonium molybdate tetrahydrate are dissolved in deionized water. For nitrates with low solubility, a small amount of dilute nitric acid can be added dropwise to the solution to promote dissolution, while stirring with a magnetic stirrer. After it is completely dissolved, add 1mol / L sodium hydroxide solution or potassium hydroxide solution dropwise to the clear liquid, adjust the pH value to 9-10, stop adding lye, continue stirring and add heat for 30 minutes (the purpose is to ensure that the precipitation reaction is complete), molybdate precipitation no longer increases, stop stirring and heating. After the particle precipitate in the solution is completely precipitated, remove the supernatant, add 250ml of deionized water to wash, and repeat...

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Abstract

A high-doping-concentration red fluorescent powder and a preparation method thereof are disclosed. The chemical composition of the red fluorescent powder is A[x]B[1-x]MoO[4]:yEu<3+>, wherein Eu<3+> is an activator ion, A is Ca or Ba, B is Sr, x is equal to 0.2-0.8, and y is equal to 0.01-0.20. The preparation method comprises: precisely weighing raw materials according to the molar ratio in the chemical formula, firstly employing a co-precipitation method to obtain a precursor AxB1-xMoO4 powder of the red fluorescent powder, then mixing the precursor with Eu2O3, and fully grinding; and after uniform grinding is finished, sintering the powder at 800-900 DEG C for 2 h, cooling the furnace to room temperature, and grinding uniformly to obtain a sample. The fluorescent powder prepared according to the method can have substantially-increased doping concentration of rare earth ions, thereby possessing substantially-improved red-light luminescent intensity. The product has extremely strong absorption on ultraviolet ray with the wavelength of 250-310 nm and near ultraviolet light with the wavelength of 380-410 nm, is strong in red-light luminescent intensity, and is applicable to fluorescent lamps and LED chips emitting near ultraviolet light. Through a lot of selecting experiments, a Ba[0.4]Sr[0.6]MoO[4]:yEu<3+> system is discovered to have the quenching concentration up to 20%.

Description

technical field [0001] The invention belongs to the technical field of material preparation. It relates to fluorescent powder and a preparation method thereof. Background technique [0002] Since Nichia Corporation of Japan successfully developed the world's first high-efficiency GaInN-based blue LED in 1993, full-color LEDs have been realized. The performance of high luminous efficiency and low power consumption makes LED have broad application prospects. In order to realize white light LED (W-LED), the currently more feasible method is to use light conversion phosphor method. At present, there are two main ways for mainstream commercial W-LEDs to obtain white light: 1) GaN chip + YAG:Ce yellow phosphor; 2) InGaN chip + red / green / blue three primary color phosphors. Method 1) In white light, blue light and yellow light are mixed into white light, so its color rendering index is not good. Method 2) solves the problem of low color rendering index. However, the commercial ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09K11/68
Inventor 于立新魏水林李富海孙家驹李宋楚
Owner NANCHANG UNIV
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