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Silicate blue fluorescent powder for white-light LED and preparation method thereof

A blue phosphor, silicate technology, applied in chemical instruments and methods, luminescent materials, the use of gas discharge lamps, etc., can solve the problem of low luminous efficiency of blue phosphors, easy absorption by red and green phosphors, Affecting LED luminous performance and other issues, achieving the effects of high luminous intensity, good chemical stability and thermal stability, and simple preparation process

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

AI Technical Summary

Problems solved by technology

At present, the main problem affecting the luminous performance of LEDs is the low luminous efficiency of blue phosphors, which are easily absorbed by red and green phosphors, etc.

Method used

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

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] According to the chemical formula Ca 0.98 SiO 3 :0.02Eu 2+ The stoichiometric ratio of each element in the formula is weighed CaO (A.R.) 0.98mol, SiO 2 (A.R.)1mol and Eu 2 o 3 (99.99%) 0.01mol; Then take by weighing the flux H of 0.5wt% of the total drug mass 2 BO 3 ; CaO, SiO 2 and H 2 BO 3 After fully mixing, place it in a muffle furnace for calcination at a temperature of 1500°C for 3 hours; weigh the Eu 2 o 3 After mixing evenly with the calcined product, calcining in a reducing atmosphere provided by activated carbon powder combustion, the calcining temperature is 1200 ° C, and the time is 4 hours; the above product is ground, washed, dried, and sieved to obtain the target product.

Embodiment 2

[0022] According to the chemical formula Ca 0.96 SiO 3 :0.04Eu 2+ The stoichiometric ratio of the elements in the 3 (A.R.)0.96mol, H 2 SiO 3 (A.R.)1mol and Eu 2 o 3 (99.99%) 0.02mol; Take by weighing the flux NH of 1.6wt% of the above drug gross mass again 4 HF 2 ; the CaCO 3 、H 2 SiO 3 and NH 4 HF 2 After fully mixing, place it in a muffle furnace for calcination, the calcination temperature is 1300°C, and the time is 5 hours; the weighed Eu 2 o 3 After mixing evenly with the calcined product, calcining in a reducing atmosphere provided by nitrogen / hydrogen mixed gas, the calcining temperature is 1300°C, and the time is 3 hours; the above product is ground, washed, dried, and sieved to obtain the target product.

Embodiment 3

[0024] According to the chemical formula Ca 0.94 SiO 3 :0.06Eu 2+ The stoichiometric ratio of each element in , respectively weighed CaO (A.R.) 0.94mol, SiO 2 (A.R.)1mol and Eu 2 o 3 (99.99%) 0.03mol; Then take by weighing the flux LiCO of 0.8wt% of the total mass of the above medicines 3 ; CaO, SiO 2 and LiCO 3 After fully mixing, put it in a muffle furnace for calcination, the calcination temperature is 1400°C, and the time is 4 hours; the weighed Eu 2 o 3 After mixing evenly with the calcined product, calcining in a reducing atmosphere provided by activated carbon powder combustion, the calcining temperature is 1400 ° C, and the time is 2 hours; the above product is ground, washed, dried, and sieved to obtain the target product.

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Abstract

The invention relates to silicate blue fluorescent powder for a white-light LED and a preparation method thereof, belonging to the technical field of luminescence materials. The silicate blue fluorescent has a chemical formula of: Ca<1-x>SiO3: xEu2+, wherein x is more than 0 and less than 0.2, and a phase structure is a pseudowollastonite structure. The preparation method comprises the following steps of: respectively weighing calcic compounds, silicic compounds, europium oxide and an appropriate amount of fluxing agent according to the stoichiometric ratio of all elements in the chemical formula; fully mixing the calcic compounds, the silicic compounds and the fluxing agent and then calcining; evenly mixing the europium oxide with the calcined products and then calcining again under the protection of reducing atmosphere; and grinding, washing, drying and screening the products to obtain the required fluorescent powder. The prepared fluorescent powder has high luminescence strength, wide excitation wavelength, good stability and color rendering property, low-cost and easily-acquired raw materials, simple process and easy industrialized production, and is suitable for ultraviolet-near ultraviolet white-light LEDs.

Description

1. Technical field [0001] The invention belongs to the technical field of luminescent materials, and in particular relates to a silicate blue fluorescent powder for white LEDs and a preparation method thereof. 2. Background technology [0002] White Light Emitting Diode (White Light Emitting Diode) has the advantages of energy saving, environmental protection, long life (more than 100,000 hours), waterproof, shockproof, concentrated beam, fast response, low working voltage, small size, easy maintenance, etc., and can be widely used outdoors Lighting, architectural decoration, landscape lighting, indoor lighting, traffic lights, automotive taillights, daytime running lights, billboards and display backlights, etc., are generally praised as green light sources in the 21st century. [0003] At present, white light LEDs that have been commercialized on a large scale still use blue light to excite yellow phosphor (YAG:Ce) to mix to produce white light, but due to the lack of red ...

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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