CN102354719A - Device and method for producing white light with high color rendering index - Google Patents
Device and method for producing white light with high color rendering index Download PDFInfo
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- CN102354719A CN102354719A CN2011103029351A CN201110302935A CN102354719A CN 102354719 A CN102354719 A CN 102354719A CN 2011103029351 A CN2011103029351 A CN 2011103029351A CN 201110302935 A CN201110302935 A CN 201110302935A CN 102354719 A CN102354719 A CN 102354719A
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Abstract
The invention relates to a method for producing white light by utilizing a red-light LED (light emitting diode) chip and a blue-light LED chip, which comprises the following steps of: utilizing the red-light LED chip to produce red light with the wavelength being 615-635nm; utilizing the blue-light LED chip to produce blue light with the wavelength being 440-465nm; and irradiating YAG (yttrium aluminum garnet) fluorescent powder with hybrid light of the red light and the blue light to stimulate the white light. Due to the utilization of the method, a color rendering index of the white light can be improved to 80-95 from 70, and the use of a purple-light LED and special fluorescent powder thereof is avoided, so that on one hand, the production cost is reduced, and on the other hand, the harm of purple light with harmful wavelength to human health is eliminated.
Description
Technical field
Relate generally to of the present invention utilizes led chip to produce the apparatus and method of white light.More specifically, red light chips that the present invention relates to utilize the YAG phosphor powder matching to send specific band light and blue chip obtain having the apparatus and method of the white light of high color rendering index (CRI).
Background technology
Along with the development of technology, increasing white LED lamp is used to the general lighting field.Compare with existing incandescent lamp, white LED lamp has advantages such as volume is little, caloric value is low, power consumption is little, the life-span is long, reaction speed is fast, environmental protection, therefore has bright development prospect.
One of parameter of the performance of measurement white LED lamp is a color rendering index, i.e. the degree of closeness of its white light that sends and normal daylight (color rendering index of normal daylight is 100).The current combination that utilizes multiple monochromatic light led chip usually or utilize the monochromatic light led chip to cooperate fluorescent material to produce white light with different color rendering indexs.For example; Can utilize the combination of red light chips, blue chip and green glow chip or blue chip that surfaces coated is covered with gold-tinted fluorescent material to produce white light; But the former production cost is than higher; Be unfavorable for applying, and the color rendering index of the white light that the latter produces is relatively low and fluorescent material is prone to aging.
One Chinese patent application 200810000145.6 (publication number CN101476701) discloses a kind of generation and has had the method than the white light of high color rendering index (CRI); Its direct stimulation of purple light that utilizes the purple LED chip of emission wavelength 380～410nm to be produced comprises the yellowish-white emitting phosphor of zinc, sulphur, selenium, oxygen at least; Send the yellowish-white light of continuous wavelength 470～670nm behind this fluorescent material irriate, it mixes generation and has the white light than high color rendering index (CRI) with purple light.
US Patent No. 6765237 discloses similar method, and difference is that the purple light scope of its selection is 380～420nm, and used fluorescent material comprises Ba, Mg, Al, O and multiple rare earth element.
This shows that though utilize purple LED can access the white light of higher color rendering index, its used fluorescent material needs special preparation, this has just greatly improved the production cost of light emitting source.In addition, the purple light that existing purple LED chip sends is usually all at 360～420nm wave band, and this wave band comprises the long wave ultraviolet of wavelength 320nm-400nm, is called for short UVA.Long wave ultraviolet is eager to excel more than ultraviolet B radiation to the penetrability of clothing and human body skin; Can reach deep dermis, but and the melanin of his-and-hers watches skin zone position work, thereby cause that dermal melanin is calm; Make skin darkening, play the effect of defence ultraviolet ray, protection skin.Thereby long wave ultraviolet also is referred to as " tanned section ".Though long wave ultraviolet can not cause the skin acute inflammation, slow to the effect of skin, but long-term accumulation is one of reason that causes skin aging and grievous injury.
Therefore, have the demand to the New LED light-emitting device, this LED light-emitting device can significantly improve the color rendering index of white light, and can avoid containing the injury that the purple light of harmful wavelength causes health, realizes emergency lighting.
Summary of the invention
According to an aspect of the present invention, a kind of method of utilizing red LED chip and blue-light LED chip to produce white light is provided, it is characterized in that:
Utilize red LED chip to produce the ruddiness of wavelength for 615-635nm;
Utilize blue-light LED chip to produce the blue light of wavelength for 440-465nm; And
Make the mixed light irradiation YAG fluorescent material of said ruddiness and said blue light inspire white light.
In further execution mode, said YAG fluorescent material and said led chip are kept apart, to slow down cause because of being heated aging.
In further execution mode, the ratio of the light intensity of said ruddiness and said blue light is 18-25%: 75-82%, and is preferably 1: 4.
According to another aspect of the present invention, a kind of white LED lamp is provided, it is characterized in that comprising:
One or more red LED chips, it produces wavelength is the ruddiness of 615-635nm;
One or more blue-light LED chips, it produces wavelength is the blue light of 440-465nm; And
Support is arranged said ruddiness and blue-light LED chip on it;
Housing, it covers said ruddiness and blue-light LED chip, and its surface-coated one deck YAG fluorescent material,
Wherein said ruddiness and blue light shine on the said YAG fluorescent material after in said housing, mixing, and inspire white light.
In further execution mode, said ruddiness and blue-light LED chip are sticked on the said support by transparent crystal-bonding adhesive.
In further execution mode, said ruddiness and blue-light LED chip are arranged to one dimension or two-dimensional array or donut form.
In further execution mode, said support is horizontally disposed with together with said ruddiness on it and blue-light LED chip.
In further execution mode, said support uprightly is fixed in the said housing together with said ruddiness on it and blue-light LED chip.
In further execution mode, the angle of the bottom surface of said support and said housing is greater than 60 °.
In further execution mode, said ruddiness and blue-light LED chip are arranged such that the ratio of the light intensity of said ruddiness and said blue light is 18-25%: 75-82%, and are preferably 1: 4.
In further execution mode, fill transparent cooling fluid in the said housing, to help the led chip heat radiation.
According to another aspect of the present invention, a kind of method of making white LED lamp is provided, it comprises:
Support is provided and arranges one or more ruddiness and one or more blue-light LED chip thereon;
Housing is provided and at its surface-coated one deck YAG fluorescent material;
With said support with said housing fits together so that said housing covers said ruddiness and blue-light LED chip,
It is characterized in that; When energising, it is the ruddiness of 615-635nm that said red LED chip produces wavelength, and it is the blue light of 440-465nm that said blue-light LED chip produces wavelength; And said ruddiness and blue light shine on the said YAG fluorescent material after in said housing, mixing, and inspire white light.
In further execution mode, this method is included in and fills transparent cooling fluid in the said housing, to help the led chip heat radiation.
In further execution mode, said ruddiness and blue-light LED chip are horizontally disposed with in said housing or uprightly are provided with.
The invention has the advantages that; The mixed light irradiation YAG fluorescent material of ruddiness through utilizing 615-635nm and the blue light of 440-465nm; Can obtain the white light of color rendering index up to 80-95; Simultaneously can not use the purple LED chip, avoid containing of the harm of the purple light of harmful wavelength health.The fluorescent material that uses this area YAG fluorescent material commonly used to replace being exclusively used in purple LED in addition can reduce production costs greatly.
Description of drawings
Fig. 1 schematically shows first embodiment according to LED lamp of the present invention.
Fig. 2 schematically shows second embodiment according to LED lamp of the present invention, and wherein led chip is arranged with the two-dimensional array mode.
Fig. 3 schematically shows the another kind of concentric circles annular arrangement mode of led chip.
Fig. 4 schematically shows the luminescent spectrum of blue-ray LED and red-light LED.
Fig. 5 schematically shows the luminescent spectrum of purple LED.
Embodiment:
With reference to the accompanying drawings the present invention is carried out detailed description below.At first with reference to figure 1, it schematically illustrates an embodiment according to LED lamp of the present invention.This LED lamp comprises support 4 and housing 3.On support 4, arrange one or more red LED chips 1 and one or more blue-light LED chips 2, these chips can stick on the support through transparent crystal-bonding adhesive, or otherwise are fixed on the support.The arrangement of these chips can be confirmed according to actual needs; For example in order to realize uniformly light-emitting; Red light chips and blue chip alternately can be in line each other (being one-dimensional array) or multirow (be two-dimensional array, see Fig. 2) perhaps can be arranged by concentric circles annular shown in Figure 3.Certainly, other arrangement modes also are expected.Usually, according to the relative intensity difference of blue light and ruddiness, can select suitable chip arrangement mode so that the ratio of the light intensity of ruddiness and blue light is 18-25%: 75-82%, and be preferably 1: 4.
In the present invention, can make red LED chip send the ruddiness that wave-length coverage is 615-635nm through selecting specific operating voltage, and make blue-light LED chip send the blue light that wave-length coverage is 440-465nm.After these two kinds of light mixed in housing, a part of transmission was gone out, and a part excites YAG fluorescent material to make it produce gold-tinted, outside housing, can obtain the warm white (colour temperature is 2800K-4500K) that ruddiness, blue light and yellow light mix form like this.The color rendering index of this white light is significantly higher than the white light that single blue-light excited YAG fluorescent material obtains in the prior art (its color rendering index is about 70) in the 80-95 scope.
The ruddiness of above-mentioned wave band and the schematic spectrogram of blue light have been shown among Fig. 4, and as can be seen from the figure, the peak strength of blue light is approximately 5 times of red peak intensity.As a comparison, the schematic spectrogram of the purple light that the purple LED chip sends in the prior art has been shown among Fig. 5, wherein the wave-length coverage of purple light is about 360-420nm.Though the ruddiness of above-mentioned wave band and the mixed light of blue light also are perceived as purple light by human eye; But the visual effect that this to be human eye accept simultaneously ruddiness and blue light produce; The light that does not have new wave band produces, and therefore this mixing purple light is different with the monochromatic purple light that the purple LED chip produces in essence.Do not comprise the optical band (like 360-420nm) that health is worked the mischief owing to mix purple light, resulting white light also is safe.
Another embodiment according to LED lamp of the present invention shows in Fig. 2.This LED lamp comprises oval-shaped housing 3 and is contained in support 4 wherein, is furnished with one or more red LED chips 1 and one or more blue-light LED chips 2 on the support 4.Similar with embodiment shown in Figure 1; Also red light chips and blue chip alternately can be lined up one-dimensional array or two-dimensional array shown here each other; Perhaps can arrange by concentric circles annular shown in Figure 3; And can in the cavity of housing 3, fill transparent cooling fluid, to accelerate to distribute the heat that led chip produces.As previously mentioned, present embodiment uses the YAG fluorescent material on the blue-light excited housing of ruddiness and 440-465nm of 615-635nm to produce the white light with high color rendering index (CRI) equally.
Different with the conventional levels mounting means is; Support is vertically to install together with the led chip on it in this embodiment; Be about to be fixed with led chip 1 and 2 and the transparent rack 4 of positive and negative electrode (not shown) uprightly be installed on the pedestal 6 in the transparent shell 3, positive and negative electrode is closely contacted with positive-negative power line 5 respectively.When diode is switched on; The front of the led chip on the upright transparent rack can be normally luminous; And the bottom of led chip also can see through clear glass or transparent film sends brighter light; Can eliminate in the existing encapsulation technology restriction that can not outwards show the brightest one side of light-emitting diode because of the relation of current supply line thus, improve the light emission rate of light-emitting diode.
The upright installation of transparent rack can be through realizing with the bottom mold mode: transparent rack and power line are placed mould; Make the electrode on the transparent rack be close to power line; Pour into a mould plastic material and solidify to form pedestal around the contact position then, thereby obtain firm electrical connection the between electrode and the power line.As substituting; Also can realize the upright installation of transparent rack through snap fit; For example power line and pedestal are formed as one; And in the middle part of pedestal, form groove to expose a side of power line; The size of this groove is set to the transparent rack that closely clamping has electrode; Thereby when inserting transparent rack, can form firm being electrically connected between electrode and the power line.In this way, transparent rack and pedestal can utilize standard technology to form in batches respectively, and can assemble fast.
Should be noted that aforementioned pedestal is not essential to the invention, any means that transparent rack uprightly can be fixed in the transparent vessel can be used.For example, can come upright fixedly transparent rack through embedding in transparent vessel and curing transparent material.It will be appreciated that, so-called here vertically or upright and do not mean that the angle of support and bottom surface is entirely 90 °, in fact support with respect to the angle of bottom surface greater than 45 ° and all be interpreted as in the upright scope that is limited when being preferably greater than 60 °.
Though shown circular transparent outer cover among Fig. 2, should be appreciated that transparent outer covers square or other shapes also are suitable for.In addition, this transparent outer cover can use materials such as transparent plastic or glass to process.
Though specifically with reference to the accompanying drawings execution mode has described the present invention in detail, it will be apparent to those skilled in the art that other execution mode can obtain identical result.Variation of the present invention and modification will be conspicuous for those skilled in the art, and be included in the application's the scope.
Claims (18)
1. method of utilizing red LED chip and blue-light LED chip to produce white light is characterized in that:
Utilize red LED chip to produce the ruddiness of wavelength for 615-635nm;
Utilize blue-light LED chip to produce the blue light of wavelength for 440-465nm; And
Make the mixed light irradiation YAG fluorescent material of said ruddiness and said blue light inspire white light.
2. the method for claim 1, wherein said YAG fluorescent material and said led chip are kept apart.
3. method as claimed in claim 1 or 2, the ratio of the light intensity of wherein said ruddiness and said blue light is in the scope of 18-25%: 75-82%.
4. method as claimed in claim 3, the ratio of the light intensity of wherein said ruddiness and said blue light is 1: 4.
5. white LED lamp is characterized in that comprising:
One or more red LED chips, it produces wavelength is the ruddiness of 615-635nm;
One or more blue-light LED chips, it produces wavelength is the blue light of 440-465nm; And
Support is arranged said ruddiness and blue-light LED chip on it;
Housing, it covers said ruddiness and blue-light LED chip, and its surface-coated one deck YAG fluorescent material,
Wherein said ruddiness and blue light shine on the said YAG fluorescent material after in said housing, mixing, and inspire white light.
6. LED lamp as claimed in claim 5, the ratio of the light intensity of wherein said ruddiness and said blue light is in the scope of 18-25%: 75-82%.
7. LED lamp as claimed in claim 5, the ratio of the light intensity of wherein said ruddiness and said blue light is 1: 4.
8. LED lamp as claimed in claim 6, wherein said ruddiness and blue-light LED chip are sticked on the said support by transparent crystal-bonding adhesive.
9. LED lamp as claimed in claim 8, wherein said ruddiness and blue-light LED chip are arranged to one dimension or two-dimensional array or donut form.
10. like each described LED lamp among the claim 5-9, wherein said support is horizontally disposed with together with said ruddiness on it and blue-light LED chip.
11. like each described LED lamp among the claim 5-9, wherein said support uprightly is fixed in the said housing together with said ruddiness on it and blue-light LED chip.
12. LED lamp as claimed in claim 11, the angle of the bottom surface of wherein said support and said housing is greater than 60 °.
13. fill transparent cooling fluid in the LED lamp as claimed in claim 5, wherein said housing.
14. a method of making white LED lamp, it comprises:
Support is provided and arranges one or more ruddiness and one or more blue-light LED chip thereon;
Housing is provided and at its surface-coated one deck YAG fluorescent material;
With said support with said housing fits together so that said housing covers said ruddiness and blue-light LED chip,
It is characterized in that; When energising, it is the ruddiness of 615-635nm that said red LED chip produces wavelength, and it is the blue light of 440-465nm that said blue-light LED chip produces wavelength; And said ruddiness and blue light shine on the said YAG fluorescent material after in said housing, mixing, and inspire white light.
15. method as claimed in claim 14, it further is included in and fills transparent cooling fluid in the said housing.
16. like claim 14 or 15 described methods, wherein said ruddiness and blue-light LED chip are horizontally disposed with in said housing or uprightly are provided with.
17. method as claimed in claim 14, the ratio of the light intensity of wherein said ruddiness and said blue light is in the scope of 18-25%: 75-82%.
18. method as claimed in claim 17, the ratio of the light intensity of wherein said ruddiness and said blue light is 1: 4.
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| CN2011103029351A CN102354719A (en) | 2011-09-28 | 2011-09-28 | Device and method for producing white light with high color rendering index |
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| CN2011103029351A CN102354719A (en) | 2011-09-28 | 2011-09-28 | Device and method for producing white light with high color rendering index |
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| CN102945914A (en) * | 2012-08-17 | 2013-02-27 | 南通脉锐光电科技有限公司 | Phosphor glass coating for optical wavelength conversion and white light emitting device |
| CN103078048A (en) * | 2013-01-08 | 2013-05-01 | 南通脉锐光电科技有限公司 | White light emitting device |
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Application publication date: 20120215 |