Preparation method of remote fluorescent film for high-power LED

A long-range fluorescence, high-power technology, applied in the field of materials science, can solve the problems of light loss and small viewing angle, and achieve the effects of reducing specular reflection, increasing efficiency, and simple preparation process

Inactive Publication Date: 2018-10-09
SHANGHAI INST OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the above-mentioned technical problems in the prior art, the present invention provides a method for preparing a remote fluorescent film for high-power LEDs. The method for preparing a remote fluorescent film for high-power LEDs needs to solve the existing problems. In the technology, a series of fluorescent films prepared based on a flat glass substrate have a small viewing angle when the light is transmitted on a flat glass substrate, and the technical problem that a large part of the light is lost due to total internal reflection

Method used

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  • Preparation method of remote fluorescent film for high-power LED
  • Preparation method of remote fluorescent film for high-power LED
  • Preparation method of remote fluorescent film for high-power LED

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] 1) The SiO that will be weighed 2 , B 2 o 3 , ZnO, Na 2 CO 3 The mass percentages of the raw materials are respectively: 25%, 42%, 20%, and 13%, and they are mixed evenly, and a glass block is prepared by a melting method, and the powder is ground;

[0019] 2) Weighing glass powder and fluorescent powder with a mass ratio of 20 parts and 6 parts, dispersing the powder in an organic solvent with a mass ratio of 8 parts, and uniformly mixing to form a slurry with a viscosity of 145 to 155 cps;

[0020] 3) The slurry prepared in 2) is coated on a frosted glass plate by screen printing technology;

[0021] 4) The fluorescent film prepared in 3) is baked in a vacuum oven at 150-200°C for 1-2 hours, and then sintered at a low temperature of 540-660°C for 10-30 minutes to obtain the remote fluorescent film material.

[0022] Further, described organic solvent is made up of cyclohexane, terpineol, lauric acid and ethyl cellulose, and the mass ratio of cyclohexane, terpineo...

Embodiment 2

[0028] 1) The SiO that will be weighed 2 , B 2 o 3 , ZnO, Na 2 CO 3 The mass percentages of raw materials are respectively: 27%, 39%, 20%, 14%, mixed evenly, preparing glass block by melting method, and grinding powder;

[0029] 2) Weigh glass powder and fluorescent powder with a mass ratio of 25 parts and 5 parts, disperse the powder in an organic solvent with a mass ratio of 8.5 parts, and uniformly mix to form a slurry with a viscosity of 145 to 155 cps;

[0030] 3) The slurry obtained in 2) is coated on a frosted glass plate with a spin-coating technique;

[0031] 4) The fluorescent film prepared in 3) is baked in a vacuum oven at 150-200°C for 1-2 hours, and then sintered at a low temperature of 540-660°C for 10-30 minutes to obtain the remote fluorescent film material.

[0032] Further, described organic solvent is made up of cyclohexane, terpineol, lauric acid and ethyl cellulose, and the mass ratio of cyclohexane, terpineol, lauric acid and ethyl cellulose is 5:10...

Embodiment 3

[0034] 1) The SiO that will be weighed 2 , B 2 o 3 , ZnO, Na 2 CO 3 The mass percentages of the raw materials are respectively: 30%, 36%, 19%, and 15%, which are mixed evenly, and the glass block is prepared by melting method, and the powder is ground;

[0035] 2) Weigh glass powder and fluorescent powder with a mass ratio of 40 parts and 5.5 parts, disperse the powder in organic matter with a mass ratio of 10 parts, and uniformly mix to form a slurry with a viscosity of 145 to 155 cps;

[0036] 3) The slurry obtained in 2) is coated on a frosted glass plate with a spin-coating technique;

[0037] 4) The fluorescent film prepared in 3) is baked in a vacuum oven at 150-200°C for 1-2 hours, and then sintered at a low temperature of 540-660°C for 10-30 minutes to obtain the remote fluorescent film material.

[0038] Further, described organic solvent is made up of cyclohexane, terpineol, lauric acid and ethyl cellulose, and the mass ratio of cyclohexane, terpineol, lauric ac...

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Abstract

The invention provides a preparation method of a remote fluorescent film for a high-power light-emitting diode (LED). The preparation method comprises the following steps: first, preparing low-melting-point glass powder by a melting method, dispersing the glass powder and fluorescent powder in an organic solvent, and uniformly mixing them into a fluorescent glass slurry; and coating the fluorescent glass slurry on a frosted glass substrate by a spin coating/screen printing technology to form a uniform fluorescent film layer, drying the uniform fluorescent film layer in a vacuum oven, then sintering the uniform fluorescent film layer at low temperature, and cooling the uniform fluorescent film layer along with a furnace to obtain the fluorescent film. The fluorescent film prepared by the method is simple in preparation process and good in chemical and optical properties; in addition, a glass substrate with a frosted surface can reduce specular reflection and minimize total internal reflection so as to increase the efficiency of white light output; therefore, compared with a flat glass plate, the fluorescent film with a frosted glass substrate is increased in efficiency under the excitation of an LED blue light chip, and the preparation method is easy to control and realize white light output, so that the fluorescent film can be applied to the field of semiconductor lighting.

Description

technical field [0001] The invention belongs to the field of material science and relates to a luminescent material, in particular to a preparation method of a remote fluorescent film used for high-power LEDs. Background technique [0002] At present, industrialized LEDs excite Ce through blue InGaN chips 3+ :YAG phosphor achieves white light output. Organic resin / silica gel is often used as packaging material. As the current increases, the temperature concentrated on the chip is difficult to disperse, resulting in the failure of the organic packaging material, which in turn reduces the luminous quality and reliability of the LED device. Aiming at the above problems, the most researched and reported solution is the all-inorganic remote fluorescent glass material (phosphors-in-glass materials). Its simple preparation method and good luminous performance make this remote fluorescent glass material have a relatively good performance in high-power LEDs. The potential use value...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C4/12C03C3/068C03B19/06H01L33/50
CPCC03B19/06C03C3/068C03C4/12C03C2204/08H01L33/505
Inventor 徐玲芝赵国营金文田孟少华刘玉峰侯京山房永征
Owner SHANGHAI INST OF TECH
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