Method for making white-light LED with high color rendering index

A production method and high color rendering technology, applied in the direction of electrical components, electrical solid devices, circuits, etc., can solve the problems of easy color drift, insufficient color restoration, and complex driving circuits, etc., and achieve low cost, strong practicability, high light effect

Inactive Publication Date: 2010-04-14
中外合资江苏稳润光电有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The above method is costly, the driving circuit is complex, and with the change of working temperature, the color is prone to drift, and it is inconvenient to use
[0005] 3. The mixture of yellow phosphor and red phosphor is excited by blue chips. Due to the addition of red light components, its color rendering index is generally between 60 and 70, and the degree of color reduction is still insufficient.

Method used

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  • Method for making white-light LED with high color rendering index
  • Method for making white-light LED with high color rendering index
  • Method for making white-light LED with high color rendering index

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Embodiment 1

[0022] In this embodiment, the blending ratio of yellow fluorescent powder, red fluorescent powder, 500-520nm green fluorescent powder, and 520-550nm green fluorescent powder is 0.5%: 0.8%: 0.5%: 5%, and the rest is organic silica gel 5. The production method includes: The following steps: fix the blue chip 2 in the base 1 with a die-bonding adhesive 4, connect the positive and negative poles of the blue chip 2 with the lead wires of the base 1 with a gold wire 3, and solder to make it conduct. Then mix the organic silica gel 5 and the fluorescent powder according to the proportion and mix thoroughly, and apply it on the periphery of the blue chip 2, subject to covering the base 1, and finally bake and solidify it into shape. The drying temperature is 120°C-150°C, and the drying time is 1 to 2 hours, according to the different adhesives used, choose the appropriate drying temperature and drying time. The adhesive can be epoxy resin, organic silica gel or a mixture of the two. ...

Embodiment 2

[0024] In this embodiment, the blending ratio of yellow fluorescent powder, red fluorescent powder, 500-520nm green fluorescent powder, and 520-550nm green fluorescent powder is 1%: 1.2%: 1%: 7%, and the rest is organic silica gel 5. Its production method is the same as Embodiment one is the same, adopt the spectrogram of the white light LED that the proportioning of this embodiment is made is as follows figure 2 As shown, its color temperature is around 4200K, and its color rendering index is 93.9.

Embodiment 3

[0026] In this embodiment, the blending ratio of yellow fluorescent powder, red fluorescent powder, 500-520nm green fluorescent powder, and 520-550nm green fluorescent powder is 1.5%: 1.6%: 1.5%: 8%, and the rest is organic silica gel 5. Its production method is the same as The same as in the first embodiment, the white light LED produced by adopting the ratio of this embodiment has a color temperature of about 6500K and a color rendering index Ra of 95.

[0027] The present invention can also reduce the proportion of one or several kinds of phosphors and increase the proportions of other phosphors as required, so as to produce white LEDs with different color temperatures and high color rendering index.

[0028] The basic principle of the present invention is: the blue light emitted by the blue chip excites the fluorescent powder of three colors to emit green light, yellow light and red light of two wavelengths respectively, and the green light then excites the yellow fluoresce...

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Abstract

The invention discloses a method for making a white-light LED with a high color rendering index, which comprises the following steps: fixing a blue LED wafer in a base by adhesive, welding a golden wire, evenly mixing the mixture of the adhesive and fluorescent powder, coating the mixture on the blue LED wafer, and baking to cure and form, wherein the fluorescent powder is mixed by yellow fluorescent powder, red fluorescent powder and green fluorescent powder with a plurality of wavelengths. The invention has the advantages of simple operation process, low cost, strong practicability and high light efficiency; by adjusting the mixing proportion of four kinds of fluorescent powder, spectrums with five continuous wavelengths can be obtained, thereby realizing the spectral radiance of 430-700 nm; the color rendering index of the white-light LED can reach above 90; and the color temperature can be continuously adjusted within the range of 2,800-6,500 K.

Description

technical field [0001] The invention relates to a method for manufacturing a white light LED, in particular to a method for manufacturing a white light LED with a high color rendering index, and belongs to the field of optoelectronic technology. Background technique [0002] As a light source, white LED has the characteristics of high luminous efficiency, long life, strong applicability, and no pollution to the environment. It is gradually being used in lighting, traffic lights, car signal lights, background light sources and other fields. The color rendering index is an important technical index of white LEDs. The higher the color rendering index, the higher the true degree of the color of the object. The existing manufacturing methods of white light LEDs with high color rendering index are as follows: [0003] 1. A violet light chip is used to excite a phosphor mixed with red phosphor, green phosphor and blue phosphor to produce white light, thereby obtaining a white LED ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/48H01L33/50H01L33/52
CPCH01L2224/48091H01L2224/73265
Inventor 胡建红
Owner 中外合资江苏稳润光电有限公司
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