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Fluorescent glass and preparation method and application thereof

A fluorescent glass and fluorescent powder technology, applied in the field of luminescent materials, can solve the problems of high cost, long mixing time, complicated process, etc., and achieve the effects of good air tightness and light transmission, simple packaging operation, and simple processing technology.

Active Publication Date: 2012-05-09
厦门市华海光电科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the fluorescent powder used for LED packaging materials is mostly made of ball mill. This kind of fluorescent powder is easy to precipitate and precipitate from the fluorescent slurry when coating, resulting in uneven coating and easy to cause white light tones drift. Makes the color of LEDs appear blue or yellow
Moreover, since the particle size distribution of the phosphor powder produced by the existing ball mill is wide, the appearance is irregular, and it is easy to aggregate, which makes it necessary to place the corundum beads in the ball mill and mix them for at least 2 hours when preparing the packaging material. After drying, the dried composite powder needs to be sieved, followed by high-temperature hot pressing, sintering, etc., and finally the sintered body must be ground and polished to complete the preparation. For details, please refer to the application number 200910154360 , The application date is November 30, 2009, the Chinese invention patent application titled "A Phosphor / Glass Composite for Semiconductor Lighting and Its Preparation Method"
[0005] The preparation of LED materials using the above-mentioned fluorescent powder mainly has the following disadvantages: it is necessary to use a ball mill and mix it with corundum grinding beads, and the mixing time is too long; the dried composite powder needs to be sieved, and then it needs to be plane. Grinding, polishing, the whole preparation process is complicated, low in efficiency and high in cost
However, in view of the shortcomings of the aforementioned phosphor powder, after being mixed with the aforementioned phosphor powder, there are still disadvantages such as low luminous efficiency and unstable luminous performance, which cannot meet people's needs for high reliability, ultra-long life, and high light transmittance of LEDs. Requirements, and requirements for LED preparation, packaging methods, efficiency, and cost

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) 800g glass powder (light transmittance 85-95%, softening temperature T g 300°C, sintering temperature is 350°C) and 200g phosphor (Y 2 o 3 :Eu red phosphor, BaAl 12 o 19 : Mn blue phosphor, Ce 1-x TbxMgAl 11 o 19 Green fluorescent powder, the mass ratio of the three fluorescent powders is 1:2:3, and the particle size is 0.1 ~ 1 μm, all are spherical non-aggregated fluorescent powder) as the starting material, and 250g of absolute ethanol in Stir and mix at a speed of 1800rpm in the mixer to obtain a composite powder;

[0030] (2) Filter the composite powder obtained in step (1), and then dry at 100° C. to obtain fluorescent glass;

[0031] (3) Melt the fluorescent glass below 600°C;

[0032] (4) After the LED chip solidification and wire bonding are completed, a layer of glass powder (thickness is 0.1 μm) is covered by vacuum evaporation on the chip; after cooling, the glass powder on the LED chip is coated with a dispensing doctor blade The molten fluoresc...

Embodiment 2

[0034] (1) 950g glass powder (light transmittance 85-95%, softening temperature T g 500°C, sintering temperature is 580°C) and 50g phosphor (Y 3 Al 5 o 12 :Eu red phosphor, Y 2 SiO 5 : Ce blue phosphor, Y 3 Al 5 o 12 : Tb green fluorescent powder, the mass ratio of three kinds of fluorescent powder is 1: 1: 2, and particle size is 2~3 μ m, is all spherical non-aggregated fluorescent powder) as starting material, and 430g anhydrous Ethanol is stirred and mixed at a speed of 1300rpm in a mixer to obtain a composite powder;

[0035](2) Filter the composite powder obtained in step (1), and then dry at 150° C. to obtain fluorescent glass;

[0036] (3) Melt the fluorescent glass below 600°C;

[0037] (4) After the LED chip solidification and wire bonding are completed, a layer of glass powder (thickness is 0.2 μm) is covered by vacuum evaporation on the chip; after cooling, the glass powder on the LED chip is coated with a dispensing doctor blade The molten fluorescent gla...

Embodiment 3

[0039] (1) 900g glass powder (light transmittance 85-95%, softening temperature T g 420°C, sintering temperature is 450°C) and 100g phosphor (Sr 5 (PO 4 ) 3 Cl:Eu red phosphor, Y 2 SiO 5 : Ce blue phosphor, Y 3 Al 5 o 12 : Tb green fluorescent powder, the mass ratio of the three fluorescent powders is 1:1:2, and the particle size is 2 to 3 μm, and it is a spherical non-aggregated fluorescent powder) as the starting material, and 1500g anhydrous Ethanol is stirred and mixed at a speed of 1500rpm in a mixer to obtain a composite powder;

[0040] (2) Filter the composite powder obtained in step (1), and then dry at 120° C. to obtain fluorescent glass;

[0041] (3) Melt the fluorescent glass below 600°C;

[0042] (4) After the LED chip solidification and wire bonding are completed, a layer of glass powder (thickness is 0.1 μm) is covered by vacuum evaporation on the chip; after cooling, the glass powder on the LED chip is coated with a dispensing doctor blade The molten ...

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Abstract

The invention provides fluorescent glass and a preparation method and application thereof. Fluorescent powder is spherical non-aggregated fluorescent powder, so that higher optical performance is achieved, high-speed stirring is performed by only using a stirrer in the preparation process of the fluorescent glass, the stirring mixing time is short, the efficiency is high, treatment such as sieving, planar grinding, polishing and the like is not required, a processing technic is easier, the cost is lower, and the obtained fluorescent glass has higher light transmittance and high airtightness; and when the obtained fluorescent glass is applied to encapsulation of an LED (Light-Emitting Diode) chip, glass micro powder with higher airtightness, light transmittance and anti-ageing performance than silica gel or a transparent adhesive tape is coated on the chip, and the fluorescent glass is arranged on a glass micro powder layer on the chip with a dispensing method, so that the encapsulating operation is easier and more convenient, the airtightness and light transmittance is more excellent, and the radiating performance is high. The fluorescent glass is particularly suitable for encapsulating ultraviolet LEDs.

Description

technical field [0001] The invention particularly relates to an LED fluorescent glass and a preparation method and application thereof, belonging to the field of luminescent materials. Background technique [0002] As a new type of lighting source, LED is being more and more widely used in various occasions due to its outstanding advantages such as energy saving, environmental protection, high luminous efficiency, and long life. The application of LEDs in lamps can now be used as large and small lamps such as street lamps and advertising lamps. [0003] LED light-emitting diodes have become a research and application hotspot due to energy saving. The important component in the LED light-emitting diode is the chip. LED packaging refers to the packaging of light-emitting chips. This packaging not only requires protection of the wick, but also transmits light. Therefore, there are special requirements for packaging materials in LED packaging. In the past, LED packaging was o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C4/12
Inventor 李启智诸平
Owner 厦门市华海光电科技有限公司
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