Warm white LED and preparation method thereof

A warm white light and LED chip technology, applied in the field of lighting, can solve the problems of not being able to meet semiconductor lighting, large attenuation of red phosphor powder, and shortened product life, and achieve the effects of improving use value, high color rendering index, and extending life

Inactive Publication Date: 2010-06-16
CIVILIGHT SHENZHEN SEMICON LIGHTING
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  • Summary
  • Abstract
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  • Claims
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AI Technical Summary

Problems solved by technology

However, the brightness of warm white LEDs in the prior art is very low, and the luminous efficacy is not high, generally only below 60lm / W, and the attenuation of the red phosphor used in the product is relatively large, which greatly reduces the product life, and cannot Meet the requirements of semiconductor lighting

Method used

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  • Warm white LED and preparation method thereof
  • Warm white LED and preparation method thereof

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Embodiment Construction

[0020] Such as figure 1 As shown, in the first embodiment of a warm white LED of the present invention, it includes a bracket 1, an LED chip 2 fixed on the bracket 1, and a gold wire 3 fixedly connected to the positive and negative poles of the LED chip 2. Covered with two layers of phosphors with high excitation efficiency, the phosphor layer 41 close to the chip is composed of yellow phosphor and high-refractive-index glue, and the second phosphor layer 5 is composed of red phosphor and low-refractive-index glue.

[0021] A method for preparing a warm white LED, the method comprising the following steps: S1, fixing the LED chip on a support; S2, fixing and connecting the positive and negative poles of the LED chip with gold wires; S3, coating a layer on the LED chip A mixture of yellow fluorescent powder and glue with a higher refractive index; S4. Apply a second layer of a mixture of red fluorescent powder and glue with a lower refractive index on the yellow fluorescent pow...

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Abstract

The invention relates to a warm white LED and preparation method thereof. The warm white LED comprises a support, an LED chip fixed on the support and a gold thread fixedly connecting the positive pole and negative pole of the LED chip; the LED chip is covered with at least two fluorescent powder layers, the fluorescent powder layer is combination of fluorescent powder and glue, and refractive index of the glue used by the fluorescent powder layer is reduced progressively from inside to outside. The method includes the following steps: S1, the LED chip is fixed on the support; S2, the gold thread is used for connecting the positive pole and negative pole of the LED chip; S3, mixture of fluorescent powder and glue is coated on the LED chip; S4, mixture of fluorescent powder and glue of a second fluorescent powder layer is coated on the fluorescent powder layer in the step three. By adopting the warm white LED and preparation method thereof provided by the invention, bright dipping of LED can be improved, LED warm white obtains high light and high colour rendering index, and attenuation of product is reduced, thus being more applicable to illumination.

Description

technical field [0001] The invention relates to the field of lighting, and more specifically, to a warm white LED and a preparation method thereof. Background technique [0002] LED has the characteristics of green environmental protection, long life, high efficiency and energy saving, anti-harsh environment, simple structure, small size, light weight, fast response, low working voltage and good safety, so it is known as the successor to incandescent lamps, fluorescent lamps and energy-saving lamps. After that, the fourth generation of lighting electric light source, or called the 21st century green light source. [0003] At present, LEDs on the market are mainly composed of blue LED chips mixed with various phosphors. The light emitted by the chip under electric drive excites the phosphors to produce visible light in other bands, and each part mixes colors to form warm white light. However, the brightness of warm white LEDs in the prior art is very low, and the luminous ef...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/48H01L33/50
Inventor 李美华赵西刚周恒雄
Owner CIVILIGHT SHENZHEN SEMICON LIGHTING
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