CN102790163A - White light LED based on purple light LED chip and illuminating device of white light LED - Google Patents
White light LED based on purple light LED chip and illuminating device of white light LED Download PDFInfo
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- CN102790163A CN102790163A CN2012100149229A CN201210014922A CN102790163A CN 102790163 A CN102790163 A CN 102790163A CN 2012100149229 A CN2012100149229 A CN 2012100149229A CN 201210014922 A CN201210014922 A CN 201210014922A CN 102790163 A CN102790163 A CN 102790163A
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Abstract
The invention discloses a white light LED based on a purple light LED and aims at improving the color rendering property of the while light LED based on the purple light LED chip, reducing the damage of a blue light part and increasing the conversing efficiency of the purple light LED into white light LED. According to the white light LED disclosed by the invention, by improving the white light LED and an illuminating device, the blue light part and the damage to eyes, caused by the blue light part, are weakened, a red light part in a spectrum in a light source is improved and the color rendering property of the white light LED is increased, and thus the purpose of improving the white light LED light source is achieved.
Description
Technical field
The invention belongs to the illuminating engineering field, be specifically related to a kind of luminescent system and device, particularly a kind of LED lighting device based on the purple LED chip.
Background technology
The LED lamp (Light Emitting Diode) be light-emitting diode again, is a kind of solid-state semiconductor device, can directly be converted into light to electricity.LED is luminous to be based under the function of current electronics and hole-recombination in the semi-conducting material, and at this moment the electron institute excess energy of carrying need discharge.If this excess energy is with electronics and lattice dependent interaction and discharge and promptly produce phonon, will produce heat; If this excess energy is to discharge with the photon form, just produced light.Photon energy is two energy differences between the position, has determined optical wavelength.
Present white light LEDs mainly is to utilize " blue light technology " to form white light with phosphor powder matching.Implementation method has two kinds, and first method is that coating can be by blue-light excited yellow fluorescent powder on the blue led chip, the complementary white light that forms of the gold-tinted that blue light that chip sends and fluorescent material send.And the shortcoming of a principle of this scheme is exactly Ce in this fluorophor
3+The emission spectrum of ion is not had a continuous spectrum characteristic, and color rendering is relatively poor, is difficult to satisfy the requirement of low look illumination, and luminous efficiency is also not high simultaneously.The peak efficiency of this LED reaches 44.3lm/w, and high light flux is 187lm, and the industrialization product can reach 120lm, and Ra is 75-80; Second method is to apply green and red fluorescence powder on the blue led chip; Green glow and the compound white light that obtains of ruddiness that blue light that sends through chip and fluorescent material send; Color rendering is better, but the effective conversion efficiency of the used fluorescent material of this method is lower, and especially the efficient of red fluorescence powder is lower.This LED colour temperature can reach the better result of 3000K-6000K, and Ra reaches 82-87, increases than before-mentioned products.Simultaneously, all there is the defective that consistency is poor, colour temperature changes with angle in these two kinds of methods.Fluorescent material excite peak width and short, and blue-light excited peak height and narrow, wavelength is short, energy is high, can directly penetrate on the retina of the through eyeground of crystal, the active cell oxidation reaction starts Apoptosis, causes that the retina cell damages, and causes eyesight to descend even forfeiture.
The method that purple LED excites three primary colors fluorescent powder to form white light can effectively improve the color rendering of light source, and can avoid high and narrow blue-light excited peak is the very wide white light LEDs of a kind of application prospect.But at present, on the one hand, the efficient of LED conversion of white light into purple light is lower, and the color rendering of light source is relatively poor, in order further to improve the efficient of LED conversion of white light into purple light and the color rendering of light source, need further improve the purple LED chip technology.
On the other hand; In view of the infringement property and the red light material luminous efficiency of the blue light part of existing white light LEDs based on the purple LED chip lower; Cause whole white light LEDs color rendering poor, can't better satisfy the requirement of the healthy requirement of human illumination and some special industry (for example: military affairs, medical science, museum etc.) color rendering properties of light source.
Up to the present, do not have yet a kind of to the mankind harmless and lighting source efficiently.Though these photodamageds are slowly to the mankind's effect, the difference in size of energy consumption is not that short-term can embody.But the result that they cause can not be ignored.Therefore, we demand working out a kind of low power consuming, high energy efficiency urgently, and to human health and the more useful lighting source of environment.
Summary of the invention
In order to improve color rendering based on the white light LEDs of purple LED chip, reduce the infringement property of blue light part, improve the efficient of LED conversion of white light into purple light.The present invention has improved the red light portion in the light source light spectrum through improving white light LEDs and lighting device, increased the color rendering of white light LEDs, has weakened the blue light part and to human eye's injury, thereby has reached the purpose of improved white light led light source.
At first, the present invention improves white light LEDs.After improving; White light LEDs of the present invention; Comprise the purple LED chip and cover the fluorescent material on the purple LED chip, it is formed by the purple LED excitated fluorescent powder, and described fluorescent material is preferably three primary colors fluorescent powder; It specifically is included in the purple LED chip and excites down the green emitting phosphor that produces green glow, and its emission wavelength is 495-535nm; Excite the yellow fluorescent powder that produces gold-tinted down at the purple LED chip, its emission wavelength is 540-570nm; Excite the red fluorescence powder that produces ruddiness down at the purple LED chip, its emission wavelength is 630-650nm.
The colour temperature of white light LEDs of the present invention and chromaticity coordinates can be regulated through the weight ratio between the adjustment fluorescent material.The best colour temperature of white light LEDs of the present invention is 2800-3500K.Correspondingly, fluorescent material of the present invention is (0.5-2) by weight ratio: (0.7-2.3): red bluish-green three kinds of fluorescent material (2-5) are formed; Preferably, fluorescent material of the present invention is that red bluish-green three kinds of fluorescent material of 0.8: 1: 3 are formed by weight ratio.
Secondly, light-passing board medial surface and the optically focused shell medial surface at lampshade sticks the highly reflecting films of high reflection blue light and the highly reflecting films of high reflection ruddiness respectively.
Highly reflecting films are the film of high index of refraction, are affixed on the medial surface and optically focused shell medial surface of light-passing board of low-refraction, and two reverberation of film upper and lower surfaces make to interfere to be strengthened, thereby reverberation is strengthened, and transmitted light weakens.Highly reflecting films of the present invention are the metal film that contains titanium oxide and two kinds of materials of silica, and radius is 10-40mm, and thickness is 0.5-1.1mm.
The transmitance of the highly reflecting films of high reflection blue light of the present invention and the relation curve of wavelength of light are as shown in Figure 1.These highly reflecting films are that maximum reflectivity is arranged is 40%-60% at the 460nm place at wavelength, and reflectivity is that axle is the decay of middle mind-set both sides with 460nm with the wavelength, decays to 20% respectively at 400nm and 520nm place.The present invention promptly is that the highly reflecting films with this reflect blue are affixed on the light-passing board of lampshade; Reduce the transmissivity of blue light; Thereby play the purpose that weakens blue light (435-480nm) composition; The present invention can weaken 40%-60% with the blue light in the white light LEDs spectrum (435-480nm) composition, has reduced blue light harm.
The transmitance of the highly reflecting films of high reflection ruddiness of the present invention and the relation curve of wavelength of light are as shown in Figure 2.These highly reflecting films are that maximum reflectivity is arranged is 40%-60% at the 640nm place at wavelength, and reflectivity is that axle is the decay of middle mind-set both sides with 640nm with the wavelength, decays to 20% respectively at 570nm and 740nm place.The present invention promptly is that the highly reflecting films with this reflect red are affixed on the medial surface of optically focused shell, thereby has improved the reflectivity of lampshade inside to ruddiness, replenishes the red light portion in the LED spectrum.Simultaneously, owing to a little less than the repellel of highly reflecting films to blue light of high reflection ruddiness, will weaken from the blue light in the highly reflecting films reflected back lampshade of the light-passing board of lampshade, thereby further weaken blue spectrum.
Light source color temperature of the present invention is 2700-13000K, is preferably 2800-3500K, and color rendering index is 85-97, this light source in the luminous intensity of room lighting preferably between 200-300Lux.
In a word, the present invention excites the fluorescent material that covers on the purple LED chip of the present invention through the purple LED chip, and utilizes highly reflecting films to improve red light portion in the spectrum, weakens the method for blue light part, obtains the lighting source that color rendering index is higher, harm is littler.
Lighting device of the present invention is for realizing the lighting device of above-mentioned Novel LED light source.This device is shaped as panel-shaped and pyriform, and the present invention is not limited to the shape of these devices.
When described lighting device was shaped as panel-shaped, light emitting module was made up of the white light LEDs that the purple LED chip excites three primary colors fluorescent powder to form white light, and chip is fixed on the foursquare base plate through screw.The highly reflecting films of reflect blue are glued on the medial surface of foursquare glass or plastic lamp shade; The highly reflecting films gluing of reflect red is on the inner surface of square base; Glass or plastic lamp shade are embedded in the groove of round metal frame, and the round metal frame screws on the aluminium shell of light fixture through internal and external threads.Power line links to each other with the transformer of base plate dorsal surface through the aperture on the aluminium shell wall.
When described lighting device is shaped as pyriform (as shown in Figure 2); Light emitting module is made up of the white light LEDs that the purple LED chip excites three primary colors fluorescent powder to form white light; Chip is fixed on the retainer ring through screw, and the light that chip sends can be able to concentrate through the metal light-gathering shell.The highly reflecting films of reflect blue are glued on the medial surface of glass or plastic lamp shade; The highly reflecting films gluing of reflect red is on the medial surface of metal light-gathering shell; Glass or plastic lamp shade are embedded in the becket groove, and becket screws on the metal light-gathering shell through internal and external threads.Radiating module is made up of metal shell and radiating fin, and radiating fin is fixed on the metal shell.Plastic casing screws on radiating fin with the internal and external threads form.Power line links to each other with transformer with aperture on the metal shell wall through plastic casing.
In a word, the present invention compared with prior art has following technical advantage:
The first, in common white light LEDs, the high energy blue light is bigger to the infringement of human eye; The non-visual impression photosystem of human body is the most responsive to blue light in addition, is in the circadian rhythm that the environment that receives the high energy blue light illumination can be upset human body for a long time, and this is unfavorable for promoting the use of of LED illumination; And the highly reflecting films of the present invention through adopting the high reflection blue light are to the 435-480nm spectrum (see figure 1) that quantitatively decays; The blue peak of novel white-light LED is the 50%-60% of common white light LEDs, greatly reduces the damage of blue light to human eye, and novel white-light LED of the present invention is when reducing blue peak; Effective launching efficiency of fluorescent material does not reduce, and has improved color rendering and light efficiency.
The second, the present invention is strengthened the red light portion in the LED spectrum through the reflex of highly reflecting films, makes the color rendering index of this light source higher, has improved its using value.
The 3rd, the present invention adopts the method for purple light excited three kinds of fluorescent material to produce white light, and with respect to blue-light excited white light LEDs, color rendering index is higher.
The 4th, novel white-light LED of the present invention had both inherited common white LED light source efficiency height, the life-span is long, volume is little, reliability is high, can not cause advantages such as mercury pollution, has also corrected its part shortcoming simultaneously; Novel white-light LED of the present invention, approaching with the sunlight spectrum of optimum in the spectral region of visible light, be continuous spectrum, color rendering index is high, and color is comprehensive, can reduce the color of object well.
Description of drawings
Fig. 1 is the transmitance of the highly reflecting films of the high reflection blue light of the present invention's use and the graph of relation of wavelength of light.
Fig. 2 is the transmitance of the highly reflecting films of the high reflection ruddiness of the present invention's use and the graph of relation of wavelength of light.
Fig. 3 is a kind of LED illuminator structure sketch map figure based on the purple LED chip of one embodiment of the invention.301 is power line; 302 is plastic casing; 303 is radiating fin; 304 is metal shell; 305 is the metal light-gathering shell; 306 is the becket groove; 307 is becket; 308 is becket; 309 is the metal light-gathering shell; 310 is retainer ring; 311 is screw; 312 is led chip.
Fig. 4 is the sectional structure sketch map of a kind of LED lighting device based on the purple LED chip of one embodiment of the invention.401 is power line; 402 is plastic casing; 403 is radiating fin; 404 is transformer; 405 is led chip; 406 is the metal light-gathering shell; 407 is the highly reflecting films of high reflection blue light; 408 is drive circuit; 409 is retainer ring; 410 is the light-passing board of glass (or plastics) lampshade; 411 is the highly reflecting films of high reflection ruddiness.
Fig. 5 improves back white light LEDs and the curve of spectrum map of improving preceding white light LEDs for the present invention.
Embodiment
Below further describe the present invention through specific embodiment, but the present invention is not limited only to following examples.Those skilled in the art can use for reference this paper content, suitably improve or adjust step method of the present invention and can realize.Special needs to be pointed out is that all are similarly replaced and change, to those skilled in the art, is conspicuous, and they all are regarded as and comprise within the scope of the present invention.
Fig. 1, Fig. 2 are respectively transmitance and the graph of relation of wavelength of light of highly reflecting films of highly reflecting films and the high reflection ruddiness of the high reflection blue light that the present invention uses.
Fig. 3 is a kind of LED illuminator structure sketch map based on the purple LED chip of one embodiment of the invention.Fig. 4 is the sectional structure sketch map of a kind of LED lighting device based on the purple LED chip of one embodiment of the invention.
A kind of LED lighting device based on the purple LED chip of present embodiment is shaped as pyriform (as shown in Figure 3).Light emitting module is made up of the white light LEDs that the purple LED chip excites three primary colors fluorescent powder to form white light, and chip 312 is fixed on the retainer ring 310 through screw 311, and the light that chip 312 sends can be able to concentrate through metal light-gathering shell 305.Highly reflecting films are glued on glass (or plastics) lampshade, and glass lamp shade is embedded in the becket groove 306, and becket 308 screws on metal light-gathering shell 309 through internal and external threads.Radiating module is made up of metal shell 304 and radiating fin 303, and radiating fin 303 is fixed on the metal shell 304.Plastic casing 302 screws on radiating fin 303 with the internal and external threads form.Power line 301 links to each other with transformer with aperture on metal shell 304 walls through plastic casing.
Claims (6)
1. white light LEDs based on the purple LED chip; Comprise the purple LED chip and cover the fluorescent material on the purple LED chip; It is formed by the purple LED excitated fluorescent powder; And light-passing board medial surface and optically focused shell medial surface at lampshade stick the highly reflecting films of high reflection blue light and the highly reflecting films of high reflection ruddiness respectively, it is characterized in that described fluorescent material is three primary colors fluorescent powder; It is included in the purple LED chip and excites down the green emitting phosphor that produces green glow, and its emission wavelength is 495-535nm; Excite the yellow fluorescent powder that produces gold-tinted down at the purple LED chip, its emission wavelength is 540-570nm; Excite the red fluorescence powder that produces ruddiness down at the purple LED chip, its emission wavelength is 630-650nm.
2. a kind of white light LEDs based on the purple LED chip as claimed in claim 1 is characterized in that described fluorescent material is (0.5-2) by weight ratio: (0.7-2.3): red bluish-green three kinds of fluorescent material (2-5) are formed.
3. a kind of white light LEDs based on the purple LED chip as claimed in claim 2 is characterized in that, described fluorescent material is that red bluish-green three kinds of fluorescent material of 0.8: 1: 3 are formed by weight ratio.
4. a kind of white light LEDs based on the purple LED chip as claimed in claim 1 is characterized in that, described highly reflecting films are the metal film that contains titanium oxide and two kinds of materials of silica of high index of refraction, and radius is 10-40mm, and thickness is 0.5-1.1mm.
5. a kind of white light LEDs as claimed in claim 1 based on the purple LED chip; It is characterized in that; The highly reflecting films of described high reflection blue light are that maximum reflectivity is arranged is 40%-60% at the 460nm place at wavelength; Reflectivity is that axle is the decay of middle mind-set both sides with 460nm with the wavelength, decays to 20% respectively at 400nm and 520nm place; The wavelength of the highly reflecting films of described high reflection ruddiness is that maximum reflectivity is arranged is 40%-60% at the 640nm place, and reflectivity is that axle is the decay of middle mind-set both sides with 640nm with the wavelength, decays to 20% respectively at 570nm and 740nm place.
6. the lighting device of the arbitrary described white light LEDs based on the purple LED chip of realization such as claim 1-5; This device is shaped as panel-shaped or pyriform; It is characterized in that; When described lighting device was shaped as panel-shaped, light emitting module was made up of the white light LEDs that the purple LED chip excites three primary colors fluorescent powder to form white light, and chip is fixed on the foursquare base plate through screw; The highly reflecting films of reflect blue are glued on the medial surface of foursquare glass or plastic lamp shade; The highly reflecting films gluing of reflect red is on the inner surface of square base; Glass or plastic lamp shade are embedded in the groove of round metal frame, and the round metal frame screws on the aluminium shell of light fixture through internal and external threads; Power line links to each other with the transformer of base plate dorsal surface through the aperture on the aluminium shell wall;
When described lighting device was shaped as pyriform, light emitting module was made up of the white light LEDs that the purple LED chip excites three primary colors fluorescent powder to form white light, and chip is fixed on the retainer ring through screw, and the light that chip sends can be able to concentrate through the metal light-gathering shell; The highly reflecting films of reflect blue are glued on the medial surface of glass or plastic lamp shade; The highly reflecting films gluing of reflect red is on the medial surface of metal light-gathering shell; Glass or plastic lamp shade are embedded in the becket groove, and becket screws on the metal light-gathering shell through internal and external threads; Radiating module is made up of metal shell and radiating fin, and radiating fin is fixed on the metal shell; Plastic casing screws on radiating fin with the internal and external threads form; Power line links to each other with transformer with aperture on the metal shell wall through plastic casing.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2012100149229A CN102790163A (en) | 2012-01-16 | 2012-01-16 | White light LED based on purple light LED chip and illuminating device of white light LED |
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| CN2012100149229A CN102790163A (en) | 2012-01-16 | 2012-01-16 | White light LED based on purple light LED chip and illuminating device of white light LED |
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| CN2012100149229A Pending CN102790163A (en) | 2012-01-16 | 2012-01-16 | White light LED based on purple light LED chip and illuminating device of white light LED |
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| CN108289211A (en) * | 2017-01-10 | 2018-07-17 | 深圳市掌网科技股份有限公司 | The eye care method of equipment is shown for virtual reality head |
| CN110145724A (en) * | 2019-04-29 | 2019-08-20 | 佛山市国星光电股份有限公司 | White light source, lamp bar and lamps and lanterns |
| CN113892022A (en) * | 2019-05-27 | 2022-01-04 | 株式会社日立高新技术 | Light source and biochemical analyzer |
| WO2022083460A1 (en) * | 2020-10-19 | 2022-04-28 | 夏林嘉 | Three-primary-color pixel unit for full-color led display screen, and full-color led display screen |
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| CN113892022A (en) * | 2019-05-27 | 2022-01-04 | 株式会社日立高新技术 | Light source and biochemical analyzer |
| WO2022083460A1 (en) * | 2020-10-19 | 2022-04-28 | 夏林嘉 | Three-primary-color pixel unit for full-color led display screen, and full-color led display screen |
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Application publication date: 20121121 |