CN101150162A

CN101150162A - A white light LED and its making method

Info

Publication number: CN101150162A
Application number: CNA2007101240394A
Authority: CN
Inventors: 孙平如; 杨丽敏
Original assignee: GUOYE-XINGGUANG ELECTRONICS Co Ltd SHENZHEN
Current assignee: Shenzhen Guoyexing Optoelectronics Technology Co., Ltd.
Priority date: 2007-10-19
Filing date: 2007-10-19
Publication date: 2008-03-26
Anticipated expiration: 2027-10-19
Also published as: CN100559621C

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

A kind of white light LEDs and manufacture method thereof

Technical field:

The present invention relates to LED luminescence technology field, refer in particular to a kind of white light LEDs and manufacture method thereof that blue-ray LED excites the fluorophor generation of yellow fluorescent powder and fluorescent orange powder.

Background technology:

At present, white light LEDs is mainly based on patent of invention US5998925 number disclosed content of the U.S., consult shown in Figure 1, blue-light LED chip 20 is positioned over substrate cavity 10 bottoms, fluorophor 30 is filled in substrate cavity 10, fluorophor 30 comprises transparent glue 310, is excited to produce the yellow fluorescent powder 320 of 555nm, after the two is evenly mixed in certain proportion, injects cavity 10 through drying shaping.It is characterized in that blue-ray LED excites YAG fluorescent material, produce the gold-tinted with the blue light complementation, become the white light of two wavelength through mixing, the ruddiness composition is few, and color rendering index is lower.

For improving this defective, Chinese patent literature publication number CN1641897A utilizes blue-light LED chip to excite the mixture of yellow fluorescent powder and red fluorescence powder, improves the color rendering of color.The red fluorescence powder launching efficiency is not high at present, and white light LEDs brightness is lower, is not suitable for street lamp and uses.

Normally used blue-light LED chip peak wavelength 450nm ~ 465nm, very high to the requirement of blue-light LED chip peak wavelength, shortcomings such as cost of manufacture height.

Summary of the invention:

Sign in the defective of above background technology, the present invention proposes a kind of white light LEDs.Comprise that blue-light LED chip, yellow fluorescence amylaceous substance and fluorescent orange amylaceous substance form, the emission wavelength of blue-light LED chip is 430nm～470nm, and the yellow fluorescence amylaceous substance is subjected to blue-light LED chip to excite the gold-tinted that can launch peak value 540nm～580nm.

The fluorescent orange amylaceous substance is excited by blue-light LED chip to launch the orange light of peak value 585nm～610nm, and its launching efficiency is higher than yellow fluorescent powder, and excitation wavelength is wideer.To be subjected to blue-ray LED to excite the back to produce wavelength is that fluorescent orange powder about 600nm is an example, as long as the light of the following peak wavelength of 570nm all can inspire orange-colored light with it, luminous efficiency can promote the brightness of LED more than 60%.Simultaneously, the emission wavelength of use led chip can be from 430nm～470nm, and the blue led chip is easier to be obtained, and the white light LEDs cost will reduce.

Yellow and fluorescent orange powder becomes fluorescent glue by joining glue, once evenly is coated on the blue-light LED chip after the mixing.Also can earlier after applying yellow fluorescent glue on the blue-light LED chip, apply fluorescent orange glue again.

Produce gold-tinted and orange light behind blue-light excited yellow fluorescent powder and the fluorescent orange powder, and can produce white light after the blue light three mixes.By adjusting the proportioning of yellow and fluorescent orange powder, utilize the high advantage of excitation wave length and width, launching efficiency of fluorescent orange powder,, not only improved brightness with respect to the white light LEDs of blue-light excited yellow fluorescent powder, also improve color rendering, be adapted to the LED street lighting especially.

Description of drawings:

Fig. 1 is previous white light LEDs example structure figure.

Fig. 2 is white light LEDs example structure figure of the present invention.

The efficiency chart that Fig. 3 fluorescent orange powder is stimulated.

Fig. 4 is that to excite the colour temperature of yellow fluorescent powder be the 4800K spectrogram to previous blue-ray LED.

Fig. 5 is that the colour temperature of white light LEDs embodiment of the present invention is the 4800K spectrogram.

Fig. 6 is that the colour temperature of white light LEDs embodiment of the present invention is the 3800K spectrogram.

Fig. 7 is that the colour temperature of white light LEDs embodiment of the present invention is the 3300K spectrogram.

Embodiment:

See also shown in Figure 2, excitation wavelength 460.0～462.5nm blue-light LED chip 2 is positioned over substrate cavity 1 bottom, fluorophor 3 is filled in substrate cavity 1, fluorophor 3 comprises transparent glue 31, is excited to produce the yellow fluorescent powder 32 and the fluorescent orange powder 33 of being excited to produce 590nm of 555nm, after the three is evenly mixed in certain proportion, injects cavity 1 drying and be shaped.

Referring to Fig. 3, the blue light that blue-light LED chip 2 sends is through the leaded light of glue 31, excite yellow fluorescent powder 32 and fluorescent orange powder 33, produce the gold-tinted of 555nm and the orange light of 590nm, the gold-tinted of 555nm can excite fluorescent orange powder 33 to produce 590nm orange light again again, and above blue light, gold-tinted, orange light three form white light at cavity 1 mixed light.Use blue-light LED chip 2 to excite the launching efficiency of fluorescent orange powder 33 higher, so can improve brightness than the launching efficiency of yellow fluorescent powder 32.

A kind of method of making above-mentioned white light LEDs is joined glue with described yellow and fluorescent orange powder, stirs, and more even mixed fluorescent glue is coated on the blue-light LED chip top.

Second kind of method of making above-mentioned white light LEDs joined glue respectively with described yellow and fluorescent orange powder, stirs, and after coating above the blue-ray LED contains the fluorescent glue of yellow fluorescent powder, applies the fluorescent glue that contains the fluorescent orange powder more earlier.

Example 1, adopt excitation wavelength 460.0～462.5nm blue-light LED chip 2, the fluorophor 3 that glue 31, yellow fluorescent powder 32 of being excited to produce 555nm and the fluorescent orange powder 33 of being excited to produce 590nm are formed, yellow fluorescent powder 32 shared fluorophor weight ratios are 6.65%, fluorescent orange powder 33 shared fluorophor 3 weight ratios are 1.33%, all the other are glue, above fluorophor 3 is stirred dry shaping after cavity 1 is injected in the back, and the spectrum of the white light LEDs of making is shown in Figure 5.Its colour temperature shows index Ra greater than 80 about 4800K, launching efficiency reaches 49LM/W than only higher with yellow fluorescent powder.

It is that 4800K spectrum is shown in Figure 4 that more previous blue-ray LED excites the colour temperature of yellow fluorescent powder, has only two peak values, and one is the blue-ray LED peak value; Another is the peak value after yellow fluorescent powder is excited, its near 555nm, the peak value height.The white light LEDs of this two wavelength is because of lacking the ruddiness composition, color rendering index Ra＜80.

Example 2, adopt excitation wavelength 460.0～462.5nm blue-light LED chip 2, the fluorophor 3 that glue 31, yellow fluorescent powder 32 of being excited to produce 555nm and the fluorescent orange powder 33 of being excited to produce 590nm are formed, yellow fluorescent powder 32 shared fluorophor weight ratios are 6.55%, fluorescent orange powder 33 shared fluorophor 3 weight ratios are 2.62%, all the other are colloid, above fluorophor 3 is stirred dry shaping after cavity 1 is injected in the back, and the spectrum of the white light LEDs of making is shown in Figure 6.Its colour temperature is about 3800K, and launching efficiency reaches 52LM/W.

Example 3, adopt excitation wavelength 460.0～462.5nm blue-light LED chip 2, the fluorophor 3 that glue 31, yellow fluorescent powder 32 of being excited to produce 555nm and the fluorescent orange powder 33 of being excited to produce 590nm are formed, yellow fluorescent powder 32 shared fluorophor weight ratios are 6.47%, fluorescent orange powder 33 shared fluorophor 3 weight ratios are 3.88%, all the other are glue, above fluorophor 3 is stirred dry shaping after cavity 1 is injected in the back, and the spectrum of the white light LEDs of making is shown in Figure 7.Its colour temperature is about 3300K, and launching efficiency reaches 54LM/W.

More than test shows, along with the increase of fluorescent orange powder 33 shared fluorophor 3 weight ratios, the colour temperature of white light LEDs of the present invention descends, and brightness but has rising.Under identical colour temperature, the color rendering index of white light LEDs of the present invention excites the higher of yellow fluorescent powder than previous blue-ray LED.

Certainly, the embodiment of the above is a preferred embodiments of the present invention, is not to limit practical range of the present invention, so all equivalences of doing according to described feature of the present patent application claim and principle change or modify, and are included in the present patent application claim.

Claims

1. a white light LEDs comprises blue led chip and cavity, it is characterized in that: be provided with the phosphor body of being made up of glue, yellow fluorescence amylaceous substance and fluorescent orange amylaceous substance in described cavity.

2. white light LEDs according to claim 1, the emission wavelength that it is characterized in that described blue led chip is 430nm～470nm.

3. white light LEDs according to claim 1 is characterized in that: described yellow fluorescence amylaceous substance is subjected to blue-light LED chip to excite the gold-tinted that can launch peak value 540nm～580nm.

4. white light LEDs according to claim 1 is characterized in that: described fluorescent orange amylaceous substance is excited by blue-light LED chip to launch the orange light of peak value 585nm～610nm.

5. a method of making above-mentioned white light LEDs is characterized in that: described yellow and fluorescent orange powder are joined glue, stir, more even mixed fluorescent glue is coated on the blue-light LED chip top.