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A kind of magnetic fluorescent powder composite material and plane coating method thereof

A technology of composite materials and phosphors, applied in semiconductor devices, electrical components, circuits, etc., can solve problems such as delamination and shorten the production cycle, achieve the effects of improving light-emitting performance, realizing one-time coating, and solving the effect of phosphor deposition

Active Publication Date: 2020-01-03
GUANGDONG JINYUAN LIGHTING TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] Aiming at the above defects of the prior art, the present invention provides a magnetic phosphor composite material and its planar coating method. The uniform distribution of particles solves the problem of delamination between the phosphor layer and the encapsulation adhesive, optimizes the process of multi-layer phosphor plane coating, and shortens the production cycle

Method used

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  • A kind of magnetic fluorescent powder composite material and plane coating method thereof
  • A kind of magnetic fluorescent powder composite material and plane coating method thereof
  • A kind of magnetic fluorescent powder composite material and plane coating method thereof

Examples

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Embodiment 1

[0044] Embodiment 1: as figure 1As shown, the present invention provides an improved method for planar coating of fluorescent powder, which includes 5 parts in total. The substrate 1 is used to support the packaging structure of the entire LED; the flip-chip LED chip 2 is fixed on the substrate 1 by die bonding or eutectic welding; the packaging glue 3 is mixed with various types of magnetic and fluorescent bifunctional compounds 4; The magnet 5 provides an external magnetic field to adsorb different fluorescent bifunctional complexes 4 to different positions in the encapsulation glue 3 .

[0045] The magnetic properties of substances are measured by magnetic permeability, and the magnetic permeability of ferroferric oxide is affected by particle size. The magnetic size of the magnetic core can be adjusted in the following way. Method 1: Surface treatment with hydrochloric acid, hydrogen peroxide, ferric chloride or oleic acid can obtain ferric oxide particles with different...

Embodiment 2

[0046] Embodiment 2: as figure 2 , image 3 As shown, different types of phosphors are used as shells to coat the ferric iron tetroxide with different magnetic properties obtained by means 1 or 2 to obtain a magnetic fluorescent bifunctional complex 4 with different magnetic properties.

[0047] Powdery fillers such as glass microspheres can be added to the encapsulation glue to obtain a colloid with improved refractive index, which is then mixed with the magnetic phosphor composite material. After being excited by the light emitted by the LED chip 2, the magnetic and fluorescent bifunctional compound 4 with different excitation wavelengths will generate light of different wavelengths, which will be mixed to produce white light emission; The ratio can be adjusted according to the requirements of the lamps for spectral energy distribution, so as to realize effective control of optical parameters such as color temperature and color rendering index.

Embodiment 3

[0048] Embodiment 3: as Figure 4 As shown, using the effect of an external magnetic field, different magnetic fluorescent bifunctional compounds are adsorbed to different positions of the encapsulation adhesive layer to realize the layered arrangement of the phosphors: the yellow phosphor is located at the bottom layer, the green phosphor is located at the middle layer, The red phosphor is on top or in some other arrangement. After the position of the phosphor particles is fixed, thermal curing is performed simultaneously to realize the coating of the phosphor layer. Using the external magnetic field, the position of the bottom phosphor can be fixed in the middle of the encapsulation adhesive layer, and there is no phosphor distribution in the lower part of the encapsulation adhesive, so as to realize the isolation of the phosphor layer and the chip, and effectively avoid the attenuation of the phosphor performance caused by the chip temperature. At the same time, the phosph...

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Abstract

A magnetic fluorescent powder composite (4) and a plane coating method therefor, comprising the following steps: preparing a magnetic fluorescent powder composite (4), and mixing same with a packaging adhesive (3) in a certain ratio uniformly; fixing a flip LED chip (2) on a package substrate (1) to form a closed circuit; coating a mixture of the magnetic fluorescent powder and the adhesive obtained in the step above on the chip (2); using the action of an external magnetic field to concentrate fluorescent powder particles having different luminescence properties at different height positions of the silica gel, and curing same after the distribution of the particles is stabilized; and mounting a peripheral optical component (7). By using the action of the magnetic field, the fluorescent powder is allowed to locate at different height positions of the packaging adhesive (3), a remote coating process can be realized, and the packaging adhesive (3) at the bottom layer directly serves as a protective adhesive for the LED chip (2), and at the same time, the chip (2) and the fluorescent powder layer are separated, so as to avoid problems such as accelerated aging and decreased reliability caused by direct conduction of heat of the chip to the fluorescent powder layer.

Description

technical field [0001] The invention belongs to the field of optoelectronic technology, and in particular relates to a magnetic fluorescent powder composite material and a plane coating method thereof. Background technique [0002] Light emitting diode (Light emitting diode) is an electroluminescent device, its core part is composed of P-type semiconductor and N-type semiconductor, which can directly convert electrical energy into light energy, and has the advantages of environmental protection, low cost, high luminous brightness, and long service life. Long and a series of advantages, known as the 21st century green lighting energy. [0003] At present, the mainstream high-power white LED is made by covering a layer of yellow phosphor (YAG or TAG) on the blue LED chip (GaN). White light after mixing. The LED obtained by this method has become a major research hotspot at home and abroad because of its advantages such as high luminous efficiency, low price, and high reliabi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L33/50
CPCH01L33/501H01L33/508H01L2933/0041
Inventor 李立勉李立群李妙姿陈育黄梓龙文尚胜吴露锶辜月纯余奕伟苏彬锋
Owner GUANGDONG JINYUAN LIGHTING TECH