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Preparation method of fluorescent powder for LED device

A technology of LED devices and phosphors, applied in chemical instruments and methods, luminescent materials, organic dyes, etc., can solve the problems of low luminous efficiency, unsatisfactory light color rendering, low thermal stability, etc., and achieve color rendering Good, excellent light stability, color temperature and effect

Inactive Publication Date: 2015-05-06
HEBEI UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the low blue light excitability, low luminous efficiency, low thermal stability and unsatisfactory light color rendering of inorganic phosphors lead to white LEDs that cannot fully meet the lighting requirements.

Method used

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  • Preparation method of fluorescent powder for LED device
  • Preparation method of fluorescent powder for LED device
  • Preparation method of fluorescent powder for LED device

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] (1) Take 1L of deionized water, and add 10% of the mixture of fluorescein isothiocyanate and rhodamine B to it -3 g, the mass ratio of the two dyes, fluorescein isothiocyanate and rhodamine B, is 2:1, and then the mixture is stirred for 1 hour to obtain a uniform mixed solution;

[0024] (2) the mixed solution obtained in step (1) and porous boron nitride are 1:10 with mass ratio -4 Mixing, that is, adding 0.1 g of porous boron nitride to the mixed solution, and then vigorously stirring for 3 hours to ensure that the organic fluorescent dye is adsorbed on the porous boron nitride;

[0025] (3) Filtrate the mixed solution obtained in step (2), put the obtained solid into a vacuum oven at 50° C., and keep it warm for 7 hours; obtain an organic fluorescent material supported by porous boron nitride, that is, a fluorescent powder for LED devices.

[0026] like figure 1 As shown, when excited with a wavelength of 466 nanometers, the phosphor can efficiently convert blue li...

Embodiment 2

[0028] Change the mass ratio of fluorescein isothiocyanate and rhodamine B to 0.5:1 in the step (1) composite dye in embodiment 1, and other operations are all the same as in embodiment 1, and the product obtained is the same as in embodiment 1

Embodiment 3、 example 4、 example 5

[0030] Change the consumption of fluorescein isothiocyanate and rhodamine B mixture into 10 respectively in step (1) in embodiment 1 -4 Gram, 2×10 -3 Gram, 5×10 -2 gram, the mass ratio of fluorescein isothiocyanate and rhodamine B is still 2:1, and other each operation is all identical with embodiment 1, obtains product with embodiment 1.

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Abstract

The invention relates to a preparation method of fluorescent powder for an LED device. The method comprises the following steps: (1) mixing water with composite dye, and uniformly stirring to obtain a mixed solution, wherein the composite dye in the step (1) is a mixture of rhodamine B and organic fluorescent dye; (2) placing porous boron nitride into the mixed solution obtained in the step (1), and stirring the mixed solution for 2 to 24 hours; and (3) filtering the mixed solution obtained in the step (2), and vacuum drying the obtained solid to obtain the fluorescent powder for the LED device. The obtained product is blue light excitation fluorescent powder adopting the porous boron nitride as a supporting body, the porous boron nitride and the organic fluorescent dye are adopted as the raw materials, and the preparation method has advantages of easily available raw materials, environmental friendliness and low cost. The fluorescent powder is excellent in luminescent performance, high in heat stability and high in lighting stability, and the preparation method of the fluorescent powder is simple, environment-friendly, reliable and suitable for mass production.

Description

technical field [0001] The invention relates to a high-efficiency photoluminescent material, in particular to a method for preparing phosphor powder used in white light semiconductor light-emitting diode (LED) devices. Background technique [0002] In the past ten years, solid-state luminescent materials have been widely researched and applied due to their excellent properties such as energy saving, long life, environmental friendliness, fast response and no mercury pollution. As a third-generation light source, white LEDs have been widely used in outdoor lighting, backlighting, automotive headlights, and small lighting systems. At present, white LED devices are usually produced by up-conversion luminescence, that is, a blue-light-emitting InGaN chip is coated with a light-conversion material for blue-light excitation and orange-light emission, and a white light source is obtained after light mixing. Currently, the most widely used light conversion phosphor material is Y 3...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C09K11/06C09B67/22
Inventor 唐成春李杰徐学文林靖黄阳罗翰
Owner HEBEI UNIV OF TECH