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Mixed fluorescent powder matched with blue-light chip and preparation method thereof

A blue light chip and phosphor technology, applied in chemical instruments and methods, luminescent materials, etc., can solve the problems of products not conforming to color temperature and color rendering index, affecting the consistency of LED products, and inaccurate mixed phosphors, etc. In large-scale industrial production, the color rendering index is improved, and the quantum efficiency is high.

Inactive Publication Date: 2011-01-19
IRICO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Since the red phosphor belongs to the nitrogen oxide system, its morphology and specific gravity are quite different from those of the yellow phosphor of the YAG system. During the process, the two phosphors are easily dispersed due to the lack of necessary cross-linking agents, resulting in poor consistency of the packaged products and failing to meet the specified color gamut requirements.
[0004] In addition, because the phosphors produced by each manufacturer and each batch are different in color coordinates and emission peaks, and the technical indicators provided by the manufacturers are not accurate, they cannot meet the needs of accurately preparing phosphors with a specified color temperature.
Therefore, it is inaccurate to prepare the mixed phosphor with the target color temperature and target color rendering index simply by relying on the commercial powder model to adjust the ratio.
This will seriously affect the consistency of LED products, resulting in a large number of products not meeting the requirements of color temperature and color rendering index

Method used

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  • Mixed fluorescent powder matched with blue-light chip and preparation method thereof
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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] The preparation of the mixed phosphor used in conjunction with the blue light chip includes the following steps:

[0030] Red Phosphor A 1-x B y o z N 2 / 3+4 / 3y-2 / 3z :xRe and yellow phosphor Y 3-a-b A l5 Ba a o 12 : Ce b 3+ According to the mass ratio of 50:100, after mixing evenly in ethanol with 2 times the mass of yellow fluorescent powder, stir under ultrasonic vibration, heat to 150°C and keep for 0.5h; then add polyvinyl alcohol with 5 times the mass of yellow fluorescent powder, 5 times the polyacrylamide, after it is completely dissolved, it is fully stirred evenly to form a gel-like mixture, and the mixed phosphor used in conjunction with the blue-ray chip is obtained.

Embodiment 2

[0032] The preparation of the mixed phosphor used in conjunction with the blue light chip includes the following steps:

[0033] Test two kinds of fluorescent pink phosphor A separately 1-x B y o z N2 / 3+4 / 3y-2 / 3z :xRe, yellow phosphor Y 3-a-b Al 5 Ba a o 12 : Ce b 3+ The color coordinates and emission wavelength, the screening color coordinates are: 0.427≤X≤0.437, 0.537≤Y≤0.547, the yellow phosphor powder whose emission wavelength is 550≤λ≤560 after being excited by blue light; the screening color coordinates are: 0.630≤X ≤0.640, 0.360≤Y≤0.370, red phosphor with an emission wavelength of 615≤λ≤625 after being excited by blue light;

[0034] Mix the screened red phosphor and yellow phosphor in a mass ratio of 38:100 in ethanol that is 5 times the mass of the yellow phosphor, stir under ultrasonic vibration, heat to 100°C, and keep for 1 hour; then add yellow phosphor 6 times the polyvinyl alcohol and 6 times the polyacrylamide in the powder mass, after they are complet...

Embodiment 3

[0036] The preparation of the mixed phosphor used in conjunction with the blue light chip includes the following steps:

[0037] Red Phosphor A 1-x B y o z N 2 / 3+4 / 3y-2 / 3z :xRe, yellow phosphor Y 3-a-b Al 5 Ba a o 12 : Ce b 3+ The screening is identical with embodiment 2;

[0038] Mix the screened red phosphor and yellow phosphor in a mass ratio of 45:100 in ethanol that is 6 times the mass of the yellow phosphor, stir under ultrasonic vibration, heat to 120°C, and keep for 0.8h; then add yellow After the polyvinyl alcohol with 8 times the mass of the phosphor powder and the polyacrylamide with 10 times the mass are completely dissolved, they are fully stirred evenly to form a gel-like mixture, and the mixed phosphor powder used in conjunction with the blue-ray chip is obtained.

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Abstract

The invention discloses mixed fluorescent powder matched with a blue-light chip and a preparation method thereof. The method comprises the following steps of: mixing red fluorescent powder A1-xByOzN2 / 3+4 / 3y-2 / 3z:xRe and yellow fluorescent powder Y3-a-bAl5Baa012:Ceb3+ according to a mass ratio of 50-35:100 in ethanol in the mass which is 2 to 10 times that of the yellow fluorescent powder, adding polyvinyl alcohol in the mass which is 5 to 10 times that of the yellow fluorescent powder and polyacrylamide in the mass which is 5 to 10 times that of the yellow fluorescent powder, and fully mixing to form a gelatinous mixture. In the method, two conventional fluorescent powders are mixed in absolute ethyl alcohol, and the polyvinyl alcohol and the polyacrylamide are added to be prepared into a supermolecular template for auxiliary mixing, so that the two fluorescent powders are uniformly dispersed to form a low-color temperature mixed fluorescent powder gel with stable homogeneous phase.

Description

technical field [0001] The invention belongs to the technical field of fluorescent powder for white light emitting diodes, and in particular relates to a mixed fluorescent powder used in conjunction with a blue light chip and a preparation method thereof. Background technique [0002] Phosphor-converted white light diodes (pc-wLEDs) are expected to become a new generation of lighting sources because of their excellent performances such as energy saving, environmental protection, and high efficiency. The current mainstream method for realizing white light is blue light (440nm-470nm) chip combined with YAG:Ce yellow phosphor. Due to the lack of red light, the white LED produced by this mode has the defects of low color rendering and high color temperature, which greatly limits its application field. In order to obtain white LED with high color rendering index, low color temperature and low glare, one of the options is to add yellow and red phosphors to the blue chip. [0003...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/80C09K11/64C09K11/59
Inventor 毕自贵
Owner IRICO
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