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A white light LED and its making method

An LED chip, white light technology, applied in electrical components, circuits, semiconductor devices, etc., can solve the problems of low brightness of white LEDs, unsuitable for street lamps, and high production costs

Active Publication Date: 2008-03-26
SHENZHEN GUOYEXING OPTOELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the excitation efficiency of red phosphor is not high, and the brightness of white LED is low, so it is not suitable for street lamps
[0004] The peak wavelength of the commonly used blue LED chip is 450nm~465nm, which has very high requirements on the peak wavelength of the blue LED chip and high production cost.

Method used

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  • A white light LED and its making method
  • A white light LED and its making method
  • A white light LED and its making method

Examples

Experimental program
Comparison scheme
Effect test

example 1

[0020] Example 1, using a blue LED chip 2 with an excitation wavelength of 460.0-462.5nm, a phosphor 3 composed of glue 31, a yellow phosphor 32 stimulated to produce 555nm, and an orange phosphor 33 excited to produce 590nm, the yellow phosphor 32 occupies The phosphor weight ratio is 6.65%, the orange phosphor 33 accounts for 1.33% of the phosphor 3 weight ratio, and the rest is glue. The above phosphor 3 is stirred evenly, injected into the cavity 1, and then dried to form a white LED. The spectrum is shown in Figure 5. Its color temperature is about 4800K, display index Ra is greater than 80, and its excitation efficiency is higher than that of yellow phosphor, reaching 49LM / W.

[0021] Compared with the color temperature of the yellow phosphor powder excited by the previous blue LED, as shown in Figure 4, there are only two peaks, one is the peak of the blue LED; the other is the peak after the yellow phosphor is excited, which is near 555nm, and the peak is high. The co...

example 2

[0022] Example 2, using a blue LED chip 2 with an excitation wavelength of 460.0-462.5nm, a phosphor 3 composed of glue 31, a yellow phosphor 32 stimulated to produce 555nm, and an orange phosphor 33 excited to produce 590nm, the yellow phosphor 32 occupies The phosphor weight ratio is 6.55%, the orange phosphor 33 accounts for 2.62% of the phosphor 3 weight ratio, and the rest is colloid. The above phosphor 3 is stirred evenly, injected into the cavity 1, and then dried to form a white LED. The spectrum is shown in Figure 6. Its color temperature is around 3800K, and its excitation efficiency reaches 52LM / W.

example 3

[0023] Example 3, using a blue LED chip 2 with an excitation wavelength of 460.0-462.5nm, a phosphor 3 composed of glue 31, a yellow phosphor powder 32 stimulated to produce 555nm, and an orange phosphor powder 33 excited to produce 590nm, the yellow phosphor powder 32 occupies The phosphor weight ratio is 6.47%, the orange phosphor powder 33 accounts for 3.88% of the phosphor 3 weight ratio, and the rest is glue. The above phosphor 3 is stirred evenly, injected into the cavity 1, and then dried to form a white LED. The spectrum is shown in Figure 7. Its color temperature is around 3300K, and its excitation efficiency reaches 54LM / W.

[0024] The above tests show that as the weight ratio of the orange phosphor 33 to the phosphor 3 increases, the color temperature of the white LED of the present invention decreases, but the brightness increases. Under the same color temperature, the color rendering index of the white LED of the present invention is higher than that of the prev...

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Abstract

This invention relates to white light LED and its manufacturing mehtod, in which, a blue light LED chip is put at the bottom of a base board cavity filled with luminophors containing transparent gluewater, yellow fluorescent powder generating 555nm by excitation and orange fluorescent powder generating 590nm by excitation and three of which are mixed uniformly in a certain proportion and put into the cavity and dried to become a LED of white light. The method includes: after yellow and orange fluorescent powder is matched and mixed uniformly, they are coated on a LED chip of blue light, which can increase brightness and evolution suitable for LED street lamps.

Description

Technical field: [0001] The invention relates to the technical field of LED lighting, in particular to a white light LED and a manufacturing method thereof, which are generated by a blue light LED exciting phosphors of yellow phosphor powder and orange phosphor powder. Background technique: [0002] At present, the white light LED is mainly based on the content disclosed in the US Patent No. US5998925. Referring to FIG. It includes transparent glue 310 and yellow fluorescent powder 320 of 555 nm when stimulated. After the two are evenly mixed in a certain proportion, they are poured into the cavity 10 and dried to form. Its characteristic is that the blue light LED excites the YAG phosphor to produce yellow light complementary to the blue light, which is mixed into white light of two wavelengths, with less red light components and a lower color rendering index. [0003] In order to improve this defect, Chinese Patent Document Publication No. CN1641897A utilizes a blue LED c...

Claims

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Application Information

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IPC IPC(8): H01L33/00
Inventor 孙平如杨丽敏
Owner SHENZHEN GUOYEXING OPTOELECTRONICS TECH CO LTD
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