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Fluorescent glass sheet and preparation method thereof

A fluorescent glass and glass substrate technology, applied in the field of glass and glass preparation, can solve the problems of affecting the luminous efficiency of phosphor powder, loss of fluorescent characteristics of phosphor powder, large consumption of phosphor powder, etc., to improve the quality of LED packaging and meet the requirements of LED packaging Requirements, the effect of reducing process costs

Active Publication Date: 2013-04-03
武汉利之达科技股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For example, the German Sumita company uses fluorescent glass to encapsulate LED modules. After lighting for 10,000 hours in an environment of 85°C, the brightness does not decline, but increases slightly, while ordinary LED packaging modules (using phosphor powder adhesive layer) reduce brightness by 20% under the same conditions. %
However, in the above-mentioned fluorescent glass preparation process, since the phosphor powder is mixed in the glass powder and sintered together, not only the consumption of phosphor powder is large (high material cost), but also the high temperature sintering process (greater than 1000 ° C) will affect the crystal phase of the phosphor powder. (Crystal structure) is damaged, so that the phosphor loses its fluorescent properties and affects the luminous efficiency of the phosphor
More importantly, the fluorescent glass needs to be cut, ground, and polished before it can be used for LED packaging, and the process cost is very high

Method used

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  • Fluorescent glass sheet and preparation method thereof
  • Fluorescent glass sheet and preparation method thereof
  • Fluorescent glass sheet and preparation method thereof

Examples

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preparation example Construction

[0021] The preparation process of the fluorescent glass sheet includes the following steps:

[0022] 1) Select a glass substrate with a light transmittance> 80% and a refractive index of 1.4 to 1.6, and clean the surface of the glass substrate;

[0023] 2) Prepare phosphor-containing glass paste. The components of the glass paste include low-temperature glass powder, phosphor, reinforcing agent, binder, dispersant, etc. among them:

[0024] Low-temperature glass powder is borate glass, boroaluminate glass, etc., and its glass transition temperature is lower than 800℃;

[0025] The phosphor can be a single-color phosphor, or a multi-color phosphor or a mixture of multiple phosphors, and the content is 5%-50% of the weight of the glass powder;

[0026] The reinforcing agent is nano-zirconia, nano-alumina or nano-silica powder, and the content is 1%-5% of the weight of the glass powder;

[0027] The binder is terpineol, polyvinyl alcohol, carboxymethyl cellulose, etc., and the blending amo...

Embodiment 1

[0036] 1) Select a borosilicate glass sheet with a thickness of 2mm (model Pyrex 7740, glass transition temperature 821°C, refractive index 1.48, and light transmittance greater than 85%), ultrasonically clean with acetone solution, and dry for use;

[0037] 2) Weigh 60 grams of terpineol, add 1 gram of cellulose and 3 grams of nano zirconia powder, stir them into a mixed solution at 70°C, and then add 100 grams of low-temperature glass powder (the main component is PbO-B). 2 O 3 , The glass transition temperature is 650℃, the refractive index is 1.45) and 50 grams of commercially available Y 3 Al 5 O 12 :Ce 3+ Yellow phosphor (YAG), mixed and stirred in a ball mill for 60 minutes to prepare a homogeneous glass slurry;

[0038] 3) Using the spin coating process, a layer of glass paste with a thickness of 50um is uniformly coated on the surface of the glass substrate;

[0039] 4) Place the coated glass substrate in a high-temperature furnace, raise the temperature from room temperature...

Embodiment 2

[0042] 1) Choose a borosilicate glass sheet with a thickness of 3mm (glass transition temperature of 640°C, refractive index of 1.40, and light transmittance greater than 80%), ultrasonically clean with acetone solution, and dry for use;

[0043] 2) Weigh 80 grams of polyvinyl alcohol, add 3 grams of fish oil and 5 grams of nano-silica powder, stir to form a solution at 70 ℃ ultrasonically, and then add 100 grams of low-temperature glass powder (the main component is B 2 O 3 +Al 2 O 3 +Na 2 O, glass transition temperature of 450℃, refractive index of 1.40) and 5 grams of commercially available Y 3 Al 5 O 12 :Ce 3+ Yellow phosphor (YAG), mixed and stirred in a ball mill for 60 minutes to prepare a homogeneous glass slurry;

[0044] 3) Using a screen printing process to uniformly coat a layer of glass paste with a thickness of 500um on the surface of the glass substrate;

[0045] 4) Put the coated glass substrate in a high-temperature furnace, raise the temperature from room temperature...

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Abstract

The invention discloses a fluorescent glass sheet and a preparation method thereof. A pulp layer with fluorescent powder is coated on the surface of a glass substrate sheet, wherein the main ingredients of the pulp consist of low-temperature glass powder, fluorescent powder, an intensifier, an adhesive, a dispersing agent and the like; the glass substrate sheet coated with the pulp layer is sintered; and the glass sheet with the fluorescent powder is obtained by controlling the sintering process. The fluorescent glass sheet is mainly applied to LED (Light Emitting Diode) packaging, the fluorescent powder preparation process can be reduced, and the packaging material and process cost are reduced; due to the high heat conductivity and the heat stability of the fluorescent glass sheet, the performance and the reliability of an LED module and a lamp can be remarkably improved; and at the same time, as the surface fluorescent powder layer is uniform in thickness and is far away from an LED chip, the LED packaging quality can be improved, and the effective control on color temperatures, chromaticity coordinates and color rendering indexes is realized. The fluorescent glass sheet can be used for packaging LED chips of various colors, can realize the single LED chip packaging and can also be used for multi-chip array LED module and LED lamp packaging, so that the method is simple and easy to carry out, and the fluorescent glass sheet is suitable for production in scale.

Description

Technical field [0001] The invention belongs to glass and glass preparation technology, and specifically relates to a fluorescent glass sheet and a preparation method thereof. The fluorescent glass sheet is mainly used for LED packaging, which can reduce the phosphor powder preparation process and reduce the packaging material and process cost. Background technique [0002] For high-power white LED packages, the role of phosphors is to combine light and color to form white light. The commonly used phosphor coating method is to mix the phosphor with the encapsulating glue (epoxy resin or silica gel), and then dot it on the LED chip. Because the coating process is difficult to accurately control the thickness and shape of the phosphor coating layer, the color temperature and color rendering index of the LED device fluctuate greatly, which affects product quality. In addition, since the phosphor adhesive layer is made of epoxy resin or silica gel and phosphor powder, the heat resis...

Claims

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Application Information

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IPC IPC(8): C03C17/04C03C14/00
Inventor 陈明祥
Owner 武汉利之达科技股份有限公司
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