CN101060151A

CN101060151A - Method for LED synthesizing white light

Info

Publication number: CN101060151A
Application number: CNA2007100273189A
Authority: CN
Inventors: 樊邦弘
Original assignee: Heshan Lide Electronic Enterprise Co Ltd
Current assignee: Heshan Lide Electronic Enterprise Co Ltd
Priority date: 2007-03-26
Filing date: 2007-03-26
Publication date: 2007-10-24

Abstract

The disclosed method for synthesizing white light by LED comprises: selecting a blue/green-light wafer to generate 430-480/510-555nm blue/green light; exciting the red fluorescent powder to generate 600-630nm red light, then mixing together into the white light. This invention needs just simple control circuit and lower laser energy, and has wide application for warm white light.

Description

A kind of method of LED synthesize white light

Technical field

The present invention relates to a kind of ligthing paraphernalia, particularly a kind of method of LED synthesize white light.

Background technology

LED means light-emitting diode from the abbreviation of English LIGHT EMITTING DIODE.The simplest light-emitting diode structure comprises, the P-N-type semiconductor N, N-N-type semiconductor N and formed between the two PN junction, when electric current passes through diode, at above-mentioned PN junction place, just produce electric charge carrier, be electronics and hole, electronics combines with the hole and gives off energy with the form of photon, add specific Semiconductor Chemistry thing at the PN junction place, then can make diode send the light of particular color, as add InGaN (InGaN) and can produce ethereal blue light, adding gallium nitride (GaN) and can produce green glow etc., the positive and negative polarities of drawing light-emitting diode with LED package and in the packaging body promptly constitute the LED lamp to connect power supply.With common tungsten lamp, white lights such as fluorescent lamp are compared, the LED lamp have life-span length, power saving, durable, firm, reaction is fast, low used heat and be suitable for advantage such as batch process.

But, in common illumination occasion, coloured LED light but can make object seem to have become color, can truly reflect the color of object not as white light, therefore develop the white LED lamp of the high-quality that is suitable for the use of general lighting occasion, be the target that the industry peer pursues always.In the prior art, white light that the LED lamp is sent or class white light generally are to utilize the light of two or more wavelength to mix, and the method for making white light or class white light on the present specifically LED market can have following several:

1, the red, green, blue three-color light-emitting diode is encapsulated in the bulb, additional circuit adjust three-color light-emitting diode power, can mix out white light, adopt the LED lamp needs of this structure respectively the power of three light-emitting diodes to be carried out independent control, so just make that the design of peripheral circuit is very complicated, cost is high.

2, use blue light and red diodes, outside two light-emitting diodes, cover yellow fluorescent powder then, the blue light illumination that blue light diode sends to the yellow fluorescent powder after, part blue light passes yellow fluorescent powder, a part is stayed and is excited gold-tinted in the fluorescent material, and the ruddiness that described blue light, gold-tinted and red diodes are sent is mixed into white light.Adopt the LED lamp of this structure,,, be unfavorable for using if both then need higher total voltage with being connected in series because the required operating voltage difference of blue light and red diodes is bigger; If then need therein series resistance on the diode with parallel connection, so just increased the making technology complexity, increase product cost.

3, use a blue outside line diode, outside this light-emitting diode, cover the red, green, blue three-color phosphor, utilize ultraviolet irradiation to produce red, green, blue three coloured light on the red, green, blue three-color phosphor and be mixed into white light, owing to can emit bigger energy after the ultraviolet ray excited red, green, blue three-color phosphor, promoted the aging of fluorescent material, reduce the life-span of product, even more serious is also can discharge harmful material after the ultraviolet ray excited red, green, blue three-color phosphor.

Summary of the invention

The technical problem to be solved in the present invention is: provide a kind of with low cost, the method for the synthesize white light that service time is long and harmless.

The present invention solves above-mentioned technical problem by following technical proposals:

A kind of method of LED synthesize white light, send the blue light that wavelength is 430 ~ 480nm by a blue light wafer, one green wafer is sent the green glow that wavelength is 510 ~ 555nm, it is 600 ~ 630nm ruddiness that the common excitated red fluorescent powder of described blue light and green glow inspires wavelength, and described green glow, blue light and ruddiness are mixed into white light.

The invention has the beneficial effects as follows: only used bluish-green two wafers, compared with the LED lamp that uses three wafers and provide cost savings, simplified control circuit; Use the blue green light excitated red fluorescent powder, contain red-green-blue in the mixed white light, the white light hot spot is even; Excitation energy is lower, can not produce harmful material, health environment-friendly.

In addition, the present invention can also do further improvement by the following technical programs:

Described blue light wavelength is 450 ~ 480nm;

Described green wavelength is 510 ~ 540nm;

It is 610 ~ 620nm that described red fluorescence powder inspires wavelength, adopts the light of above-mentioned wave-length coverage can synthesize the uniformly positive white light of hot spot as primary colours.

Description of drawings

The present invention will be further described below in conjunction with drawings and Examples,

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the vertical view of Fig. 1;

Fig. 3 is the emission spectrum figure of white light that the present invention sends;

Fig. 4 is the excitation light emission spectrogram of the selected red fluorescence powder of the present invention;

Fig. 5 is a mixed light process schematic diagram of the present invention;

Embodiment

With reference to figure 1, Fig. 2, a kind of method of LED synthesize white light, comprise a packing colloid 1, lead to the two

pins

2,3 that connects power supply in the packing colloid 1, be provided with the blue light wafer 4 and the green wafer 5 that are electrically connected with described two

pins

2,3 in the described packing colloid 1, this blue light wafer 4 and the green wafer 5 outer red fluorescence powders 6 that are coated with.Described blue light wafer 4 promptly is a light-emitting diode, generally the diode wafer of emission wavelength in 430 ~ 480nm scope can be called blue light wafer 4 in the industry; Equally, green wafer 5 promptly is to send the light-emitting diode of green glow, generally the diode wafer of emission wavelength in 510 ~ 555nm scope can be called green wafer 5 in the industry; Red fluorescence powder 6 promptly is meant a kind of fluorescent material that can inspire ruddiness behind the short light of absorptance red light wavelength, generally the fluorescent material of excitation wavelength in 600 ~ 630nm scope can be called red fluorescence powder 6 in the industry, and its emission spectrum figure sees Fig. 4.

Among the present invention, choosing emission wavelength is the interior blue light wafer 4 of 450nm ~ 480nm scope, emission wavelength is that green light color wafer 5 and the red fluorescence powder 6 of excitation wavelength in 610 ~ 630nm scope in 510nm ~ 540nm scope can be mixed into the uniformly positive white light of hot spot.After two

pins

2,3 energized, electric current is by blue light wafer 4 and green wafer 5, send blue light B and green glow G, as shown in Figure 5, part blue light B, green glow G pass red fluorescence powder 6, part blue light B, green glow G are absorbed by red fluorescence powder 6 and inspire ruddiness R, and this ruddiness R mixes with blue light B that passes red fluorescence powder 6 and green glow G can obtain white light W.The emission spectrum figure of this white light sees Fig. 3, and as can be seen from Figure, the present invention contains red-green-blue, and is all relatively good to the light color rendering of each wave band of visible light.Adjust the intensity of blue light and green glow by control circuit, can also access the white light or the pure white light of certain colourity of deflection, this technology does not need creationary experiment just can easily realize to one skilled in the art, so do not give unnecessary details at this.

Claims

1, a kind of method of LED synthesize white light, it is characterized in that: a blue light wafer sends the blue light that wavelength is 430 ~ 480nm, one green wafer is sent the green glow that wavelength is 510 ~ 555nm, it is 600 ~ 630nm ruddiness that the common excitated red fluorescent powder of described blue light and green glow inspires wavelength, and described green glow, blue light and ruddiness are mixed into white light.

2, the method for a kind of LED synthesize white light according to claim 1 is characterized in that: described blue light wavelength is 450 ~ 480nm.

3, the method for a kind of LED synthesize white light according to claim 1 is characterized in that: described green wavelength is 510 ~ 540nm.

4, the method for a kind of LED synthesize white light according to claim 1 is characterized in that: it is 610 ~ 620nm that described red fluorescence powder inspires wavelength.