CN201225532Y

CN201225532Y - Power type white light LED

Info

Publication number: CN201225532Y
Application number: CNU2008200938958U
Authority: CN
Inventors: 童华南; 肖从清
Original assignee: SHENZHEN JIUZHOU PHOTOELECTRON CO Ltd
Current assignee: Shenzhen Jiuzhou Optoelectronics Technology Co Ltd
Priority date: 2008-05-06
Filing date: 2008-05-06
Publication date: 2009-04-22
Anticipated expiration: 2018-05-06

Abstract

The utility model discloses a power type white light emitting diode which comprises a base. A groove is arranged in the middle of the base, a blue LED chip and a red LED chip are fixed in the groove, and the blue LED chip and the red LED chip are packaged in the groove through a fluorescent powder layer. Through the addition of green fluorescent powder into yellow fluorescent powder, the defect that the green light component of an ordinary LED in 500 nm is insufficient is compensated; meanwhile, through the red light compensation of the red light LED chip, compared with an ordinary LED, the utility model improves the color reproduction characteristic within a green light range and a red light range, a luminescent spectrum of the utility model is more similar to a luminescent spectrum of an electric incandescent lamp, and meanwhile, spectra of violet light, ultraviolet light and infrared light are reduced, therefore, the utility model provides a healthy and comfortable light source.

Description

The power type white light light emitting diode

Technical field:

The utility model relates to a kind of power type white light light emitting diode (LED), and it mainly is that existing white light LEDs technology is improved, and realizes the lighting source that a kind of health is comfortable.

Background technology:

White light LEDs is a kind of mixed light of many colors, and the manufacture method of white light LEDs mainly comprises following three kinds at present:

One, the mode that adds the red, green, blue three primary colors fluorescent powder with the ultraviolet leds wafer by ultraviolet excitation R, G, B three primary colors fluorescent powder, thereby produces the white light (United States Patent (USP): US5952681) of R, G, the mixing of B three-wavelength.The principle of luminosity of this mode and fluorescent lamp basic identical all is to be absorbed energy and sent three coloured light by three primary colors fluorescent powder, again the white light that obtains through mixing.Therefore should be best with regard to this mode of the continuity of spectrum, can obtain the white light similar to incandescent lamp.But, still there are not antidamping, high efficiency power-type purple light and ultraviolet leds wafer at present owing to be subjected to the restriction of material behavior and process technique.In addition because the ultraviolet light wafer all has stronger ultraviolet light, the selection of encapsulating material is just very difficult like this, the necessary ultraviolet light of these encapsulating materials of one side, can not produce deterioration because of the irradiation of ultraviolet light, these encapsulating materials are also wanted leaking of energy block ultraviolet on the other hand, to avoid that human body is produced injury: vision system pathology, physiology secretion confusion etc.

Two, the mode that adds the YAG yellow fluorescent powder with the blue-ray LED wafer produces gold-tinted by blue-light excited YAG yellow fluorescent powder, and this gold-tinted produces the white light (United States Patent (USP): US5998925) of two wavelength with not having absorbed blue light through YAG fluorescent material.The white light that this mode obtains is compared with natural daylight can find that it has lacked considerable ruddiness composition, so its colour rendering index Ra is lower, can only reach about 70.The equal radiation continuous spectrum of sunshine and incandescent lamp in wavelength of visible light (380nm-760nm) scope, is comprising various coloured light such as red, orange, yellow, green, blue, blue, purple.Object demonstrates its true colors under the irradiation of sunshine and incandescent lamp, but works as object under the irradiation of the gas-discharge lamp of discrete spectrum, and color relation has distortion in various degree.We are present the colour rendering that degree call light source of light source to the object true colors, and Ra represents with colour rendering index, and the Ra value is big more, and the colour rendering of light source is good more.Colour rendering index is the quantitative assessment to color rendering properties of light source, is as the criterion with standard sources, and the colour rendering index of incandescent lamp is defined as 100, is considered as desirable reference light source, and the colour rendering index of all the other light sources all is lower than 100.In order to improve colour rendering index, then just in yellow fluorescent powder, add red fluorescence powder, the warm white that obtains like this, its colour rendering index can reach more than 80.But present red light emitting phosphor efficient is lower, and it is also very big to decay, and therefore the warm white luminous flux that obtains like this is low, and decay is fast, and cost performance is low.

For this reason, (application number is patent documentation: propose to adopt the red-light LED wafer to replace red fluorescence powder to carry out the method for spectrally compensating 200410084197.8), so just can overcome the fast problem of red fluorescence powder decay.Adopt the blue light wafer (470nm-490nm) of long-wave band simultaneously in this patent, remedy the shortcoming of common white light-emitting diode medium green light component deficiency with this, but the blue light wafer that a distinct disadvantage of this method is exactly a long-wave band is not high to the launching efficiency of fluorescent material, causes the luminous efficiency of whole white light emitting diode low.

Three, by obtaining white light behind R, G, the B three-color LED mixed light, this method can obtain reasonable colour rendering index (about 80), but because LED has a characteristic is exactly that it has good monochromatic peak emission wavelength, therefore the white-light spectrum that obtains by this method neither be continuous, have the very sharp-pointed crest and the trough of broad, can't further improve colour rendering index again.The voltage of three kinds of LED of red, green, blue is also different in addition, so also more complicated of its control circuit.

Summary of the invention:

For addressing the above problem, the purpose of this utility model is to provide a kind of power type white light light emitting diode, to reach the purpose that substitutes natural daylight or fluorescent lamp lighting.

For achieving the above object, the utility model mainly adopts following technical scheme:

A kind of power type white light light emitting diode comprises pedestal, is provided with groove in the middle of the described pedestal, is fixed with blue led chip and red LED chips in this groove, and described blue led chip and red LED chips are encapsulated in the groove by phosphor powder layer.

Described phosphor powder layer is the mixture of being made by green emitting phosphor and yellow fluorescent powder and silica gel.

The emission peak peak wavelength of described green emitting phosphor is 500nm-540nm, and the emission peak peak wavelength of yellow fluorescent powder is 540nm-580nm.

Described blue led chip light emitting wavelength is 450nm-470nm, and the emission wavelength of red LED chips is 610nm-650nm.

The utility model is by adding green emitting phosphor in yellow fluorescent powder, thereby remedied the green glow composition defect of insufficient of common LED about 500nm, carry out the ruddiness compensation by red LED chip simultaneously, therefore compare with common LED, the utility model has improved in the green range and the colour rendering property in the red range, and its luminescent spectrum in visible light part more near the luminescent spectrum of incandescent lamp, having reduced the spectrum at purple light, ultraviolet light and infrared light simultaneously, is the comfortable lighting source of a kind of health.

Description of drawings:

Fig. 1 is the structure cutaway view of the utility model first embodiment.

Fig. 2 is the structural front view of the utility model first embodiment.

Fig. 3 is the structure cutaway view of the utility model second embodiment.

Fig. 4 is the structural front view of the utility model second embodiment.

Fig. 5 is the utility model led chip and fluorescent material optical relation coordinate diagram.

Identifier declaration among the figure: pedestal 1, blue led chip 2, red LED chips 3, phosphor powder layer 4.

The specific embodiment:

Core concept of the present utility model is: by separately blue led chip and red LED chip being carried out electric control, change the luminous intensity of blue light, green glow, gold-tinted and ruddiness, carrying out colour temperature regulates, and the material that employing yellow fluorescent powder, green emitting phosphor and silica gel mix is as encapsulating material, thereby can be by the scattering process of fluorescent powder grain, ruddiness is mixed fully with blue light, gold-tinted and green glow, avoided the red LED chips part to be identified as the situation of point-like.

For setting forth thought of the present utility model and purpose, the utility model is described further below in conjunction with the drawings and specific embodiments.

Preferred embodiment one, as Fig. 1～shown in Figure 2, the utility model mainly comprises pedestal 1, be provided with groove in the middle of the described pedestal 1, be fixed with three high-power blue led chips 2 in this groove, its emission wavelength is 450nm-470nm, and high-power red LED chips 3, its emission wavelength is 610nm-650nm, and three high-power blue led chips 2 be distributed in high-power red LED chips 3 around, and connect with different conducting terminal respectively, carry out independent control by external power source.

Be filled with phosphor powder layer 4 in the above-mentioned groove, by this phosphor powder layer 4 blue led chip 2 and red LED chips 3 are encapsulated, the phosphor powder layer here is to be that the green emitting phosphor of 500nm-540nm, yellow fluorescent powder and the silica gel that the emission peak peak wavelength is 540nm-580nm are mixed and made into by the emission peak peak wavelength, like this can be by the scattering process of fluorescent powder grain, ruddiness is mixed fully with blue light, gold-tinted and green glow, thereby avoided red LED chips 3 to be identified as the situation of point-like.And the utility model can carry out electric control to blue led chip and red LED chips separately, can change the luminous intensity of blue light, green glow, gold-tinted and ruddiness like this by the electric current of controlling two kinds of led chips, reaches the adjustable purpose of colour temperature.

Preferred embodiment two, as Fig. 3～shown in Figure 4, the utility model mainly comprises pedestal 1, be provided with groove in the middle of the described pedestal 1, be fixed with a high-power blue led chip 2 in this groove, its emission wavelength is 450nm-470nm, and two small-power red LED chips 3, its emission wavelength is 610nm-650nm, and high-power blue led chip 2 is located between two small-power red LED chips 3, and they connect with different conducting terminal respectively, carry out independent control by external power source.

Be filled with phosphor powder layer 4 in the wherein above-mentioned groove, by this phosphor powder layer 4 blue led chip 2 and red LED chips 3 are encapsulated, the phosphor powder layer here is to be that the green emitting phosphor of 500nm-540nm, yellow fluorescent powder and the silica gel that the emission peak peak wavelength is 540nm-580nm are mixed and made into by the emission peak peak wavelength, like this can be by the scattering process of fluorescent powder grain, ruddiness is mixed fully with blue light, gold-tinted and green glow, thereby avoided red LED chips 3 to be identified as the situation of point-like.And the utility model can carry out electric control to blue led chip and red LED chips separately, can change the luminous intensity of blue light, green glow, gold-tinted and ruddiness like this by the electric current of controlling two kinds of led chips, reaches the adjustable purpose of colour temperature.

The utility model is by adding green emitting phosphor in yellow fluorescent powder, thereby remedied the green glow composition defect of insufficient of common LED about 500nm, carry out the ruddiness compensation by red LED chips simultaneously, therefore compare with common LED, the utility model has improved in the green range and the colour rendering property in the red range, and its luminescent spectrum in visible light part more near the luminescent spectrum of incandescent lamp, having reduced simultaneously at the spectrum at purple light, ultraviolet light and infrared light, is the comfortable lighting source of a kind of health.As shown in Figure 5, the C point is represented the chromaticity coordinates of blue led chip, and the D point is represented the chromaticity coordinates of fluorescent material, and the F point is represented the chromaticity coordinates of red LED chips, and when only lighting the blue led chip, blue light and green-yellow light mix the mixed light that forms and be arranged in the position that figure A is ordered.And then light red LED chips, the final white light that forms is positioned at the position that A1 is ordered.When changing the electric current of blue led chip (here to be reduced to example), the A point floats to the position that B is ordered, and under the constant situation of the electrical current of red LED chips, finally forms the white light that B1 is ordered.

More than power type white light light emitting diode provided by the utility model is described in detail, used specific case herein principle of the present utility model and embodiment are set forth, the explanation of above embodiment just is used for helping to understand method of the present utility model and core concept thereof; Simultaneously, for one of ordinary skill in the art, according to thought of the present utility model, the part that all can change in specific embodiments and applications, in sum, this description should not be construed as restriction of the present utility model.

Claims

1, a kind of power type white light light emitting diode, comprise pedestal (1), it is characterized in that being provided with groove in the middle of the described pedestal (1), be fixed with blue led chip (2) and red LED chips (3) in this groove, described blue led chip (2) and red LED chips (3) are encapsulated in the groove by phosphor powder layer (4).

2, power type white light light emitting diode according to claim 1 is characterized in that described phosphor powder layer (4) is the mixture of being made by green emitting phosphor and yellow fluorescent powder and silica gel.

3, power type white light light emitting diode according to claim 2, the emission peak peak wavelength that it is characterized in that described green emitting phosphor is 500nm-540nm, the emission peak peak wavelength of yellow fluorescent powder is 540nm-580nm.

4, power type white light light emitting diode according to claim 1 is characterized in that described blue led chip (2) emission wavelength is 450nm-470nm, and the emission wavelength of red LED chips (3) is 610nm-650nm.