White light LED

A LED chip and white light technology, applied in electrical components, circuits, semiconductor devices, etc., can solve the problems of the white LED color rendering index is not greatly improved, the chip peak wavelength requirements are strict, and the excitation efficiency of red phosphor powder is low, etc., to achieve High color rendering index, wide excitation wavelength and high color rendering index

Inactive Publication Date: 2010-06-30
山西乐百利特科技有限责任公司
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AI Technical Summary

Problems solved by technology

However, due to the low excitation efficiency of the yellow phosphor and the low excitation efficiency of the red phosphor, the brightness of the white LED is low, and the color rendering index of the mixed white LED is not greatly improved, so it is not suitable for LED street lights and Indoor lighting
[0004] Moreover, the commonly used blue LED chip is limited to 450-465nm, and the peak wavelength of the chip is strictly required.

Method used

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Embodiment Construction

[0013] Blue LED chips with an excitation wavelength of 455-457.5nm, green phosphors that produce green light at 520nm when excited, orange phosphors that produce orange light at 600nm when excited, and organic silica gel OE-6550A and OE-6550B are used as production materials.

[0014] Take 1g of OE-6550A glue, 0.2g of green fluorescent powder, and 0.2g of orange phosphor and mix evenly, then add 1g of OE-6550B glue, stir evenly, and vacuumize to make fluorescent glue.

[0015] Place the blue LED chip in the bowl of the LED bracket, take the fluorescent glue after vacuuming and fill it in the bowl of the bracket, bake it at high temperature, and finally encapsulate it with transparent glue to form a white LED.

[0016] Tested with Yuanfang photoelectric tester to make a spectral diagram of white light LED. From the test data, it can be seen that its color temperature is about 4000K, and its color rendering index Ra is above 80, which is 5-10 times higher than the color rendering...

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Abstract

The invention provides a white light LED. The white light LED is formed by blending green fluorescent powder BaoSiO2, Eu, orange fluorescent powder (Y2Gd)3(Al2Ga)5O12 and A / B glue according to a weight ratio of 0.2:0.2:1:1 so as to prepare the fluorescent glue and evenly coating the fluorescent glue on a blue light LED chip having an emission wavelength from 430nm to 470nm. The blue light LED chip arouses the green fluorescent powder and the orange fluorescent powder to generate green light and orange light. After the green light and orange light are mixed with the blue light, the generated white light is more close to the white light formed by mixing three primary colors. The luminance of the white light LED is greatly promoted and the color rendering index is higher. The white light LED supports the high luminance and high color rendering index required by the current developing street lamp and the developing indoor illumination.

Description

technical field [0001] The invention belongs to the technical field of LED lighting, and relates to a white light-emitting LED, in particular to a white light LED in which green and orange phosphors are excited by a blue light LED to generate white light. Background technique [0002] The current white light LED is mainly based on the content disclosed in the American invention patent US 5998925. It is based on the blue LED chip, and the chip is filled with YAG yellow phosphor powder and transparent glue mixture that can excite the wavelength of 555nm. The blue light LED excites the phosphor powder. The yellow light produced is complementary to the blue light and mixed to become white light of two wavelengths. This white LED has less red light components and a lower color rendering index. [0003] Chinese patent publication CN 1641897A aims to improve this defect by using a blue LED chip to excite a mixture of yellow and red phosphors to improve the color rendering index of...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L33/48H01L33/50
Inventor 伍永安朱忠才高绍兵
Owner 山西乐百利特科技有限责任公司
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