CN103839511A - Light emitting device and driving method of light emitting diode - Google Patents
Light emitting device and driving method of light emitting diode Download PDFInfo
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- CN103839511A CN103839511A CN201210475615.0A CN201210475615A CN103839511A CN 103839511 A CN103839511 A CN 103839511A CN 201210475615 A CN201210475615 A CN 201210475615A CN 103839511 A CN103839511 A CN 103839511A
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Abstract
The invention discloses a light emitting device and a driving method of a light emitting diode. The light emitting device comprises at least one blue light emitting diode core, at least one red light emitting diode core and an electrical connection structure. The blue light emitting diode core can emit a first light. The red light emitting diode core can emit a second light. The electrical connection structure electrically connects the blue light emitting diode core and the red light emitting diode core and enables the blue light emitting diode core and the red light emitting diode core to emit light. When the blue light emitting diode core and the red light emitting diode core emit light, the blue light emitting diode core and the red light emitting diode core respectively consume a first electric power WB and a second electric power WR, and the correlated color temperature of the light emitting device is TN absolute temperature. The power ratio RW is the ratio of the first electric power WB to the second electric power WR. The power ratio RW is approximately between 7.67*ln(TN)-56.6 to 5.01*ln (TN)-37.2.
Description
Technical field
The present invention relates to light emitting diode, especially relate to employing light emitting diode, can produce the light-emitting device of high color rendering index and relevant driving method.
Background technology
Light emitting diode (light emitting diodes, LEDs) is a kind of light-emitting device taking semiconductor as material.Because LED itself has high life, power saving, the advantage such as light and handy, it similarly is some traditional light-emitting devices of osram lamp etc. that LED gradually replaces.The light color that LED sends often depends on the semiconductor material adopting while manufacture.
The semiconductor material that some LED adopts is three or five family's alloys, similarly is gallium nitride (galliumnitride, GaN).The process of manufacturing LED is generally that these alloys are in layer deposited in silit (silicon carbide) substrate or sapphire (sapphire) substrate in the mode of extension.And these alloys can have p-type or N-shaped to adulterate to adjust its electrical speciality.With GaN, for the basic light that LED was sent, its color is roughly to drop near ultraviolet ray (UV) or blueness on spectrum.
For the use on throwing light on, can on LED, cover layer of fluorescent powder and reach this object.Fluorescent powder is a kind of material of photoluminescence, it can absorption spectrum in certain a part of electromagnetic wave, be then emitted in the electromagnetic wave of another part in spectrum.Therefore,, in the time of the upper covering of LED layer of fluorescent powder, after being mixed mutually by the light that light and fluorescent powder sent that phosphor powder layer absorbed in LED, just can produce desirable color and brightness.
Taking white light as example, what white light LEDs adopted is the blue-ray LED taking InGaN as luminescent layer, and on this blue-ray LED, is coated with fluorescent powder, and the part blue light that it can send blue-ray LED, converts gold-tinted or green-yellow light to.In the time that this white light LEDs is powered, the semiconductor in blue-ray LED can be launched blue light (or UV light) by electric energy conversion, and wherein part will be absorbed and convert to green-yellow light (or gold-tinted) by fluorescent powder.Because gold-tinted or green-yellow light are roughly the complementary colors of blue light, be white light so human eye is judged the entire combination of this gold-tinted and blue light.White light source has several characteristics to need to consider, similarly be correlated colour temperature (correlated color temperature, and drill colour index (color rendering index CCT), CRI) be etc., all to have the natural white lights that approach for describing the white light that this white light source sends more.
Colour temperature represents with Degree Kelvin (° K), has represented the color combination that an ideal black-body is sent in the time of that temperature.Generally, with regard to spectrum, osram lamp approaches ideal black-body very much.In the time that osram lamp is heated to 2000 ° of K, can send red light.Along with temperature raises, can gradually turn orange red, yellow.During to 5000 ° of K, be roughly white.During to 8000 ° of K, be blue.Briefly, temperature is higher, and blue composition is more; Temperature is lower, and red composition is more.Because the spectral distribution of many artificial light sourcess is not same as the spectral distribution of ideal black-body, so often adopt correlated colour temperature CCT to represent its colour temperature.If the color combination that an artificial light sources sends approaches the color combination of ideal black-body in a colour temperature, the CCT of this artificial light sources is defined as this colour temperature.There is the position that several methods can be from chromaticity coordinates (Chromaticity Coordinates), derive the CCT of a white light.Although method difference, the CCT difference of deriving is not too large.
The definition that CRI is general is the performance results of 8 kinds of selected colors under that white light source irradiates.The CRI mxm. of a white light source is 100, represent 8 kinds of colors complete be reproduced out.Lower CRI, representing, in 8 kinds of colors, under the irradiation of that white light source, has larger deviation.The definition of some CRI is to have adopted 14 kinds of selected colors.In this instructions, result above or that any similar definition produces is made a general reference in the definition of CRI.
White light LEDs more well known is that employing center emission wavelength (peak-emissionwavelength) is approximately the blue light diode and the combination that be commonly called as YAG fluorescent powder (it consist of cerium doped yttrium aluminum) of 440nm to 480nm at present.YAG fluorescent powder can convert the blue light of part to green-yellow light.When human eye is seen the combined light of blue light and green-yellow light, can think white light.
At present, adopt the white light LEDs of YAG fluorescent powder or similar fluorescent powder to be difficult to reach desirable CRI and CCT.Because the light that this white light LEDs sends, on spectrum, often only has two peak values, drop on respectively near blue light and near green-yellow light, be short of and will have adjusted CRI and the needed low wavelength red light portion of CCT.So the CCT of such white light LEDs is difficult to drop to 5000 ° below K, CRI is often lower than 75.
The CCT and a method that increases its CRI that can drag down white light LEDs are the compositions that changes fluorescent powder.For instance, phosphor powder layer adopts two or more fluorescent powder: one is YAG fluorescent powder, is used for producing green-yellow light, and another kind of fluorescent powder is used for producing ruddiness specially.Such white light LEDs on spectrum, just may blue light, green-yellow light, with ruddiness near a peak value of the each generation of frequency.As long as adjust the ratio and size of peak value, just may can obtain desirable CCT and CRI.But the energy conversion efficiency of the fluorescent powder of generation ruddiness is also bad, can reduce the luminescence efficiency of whole white light LEDs.
Summary of the invention
For addressing the above problem, the invention provides a kind of light-emitting device, it comprises, at least one blue light-emitting diode tube core, at least one red light-emitting diode tube core and an electric connection structure.Blue light-emitting diode tube core can send the first light.Red light-emitting diode tube core can send the second light.Electric connection structure is in order to be electrically connected blue light-emitting diode tube core and red light-emitting diode tube core, and makes it luminous.When blue light and this red light-emitting diode tube core are when luminous, blue light-emitting diode tube core and red light-emitting diode tube core consume respectively one first electric power W
band one second electric power W
r, and the correlated colour temperature of light-emitting device is T
nabsolute temperature.Power ratio R
wbe the first electric power W
bto the second electric power W
rratio.Power ratio R
wapproximately between 7.67*ln (T
n) – 56.6 to 5.01*ln (T
n) between – 37.2.
Brief description of the drawings
The white light LEDs that Fig. 1 implements for the present invention;
Fig. 2 is the equivalent circuit diagram of the white light LEDs of Fig. 1;
Fig. 3 is the tangent plane schematic diagram of the white light LEDs of Fig. 1;
Fig. 4 is the schematic diagram of a LED core;
Fig. 5 is the correlated colour temperature T of the white light LEDs of Fig. 1
nwith power ratio R
wrelation;
Fig. 6 is the schematic diagram of an alternative embodiment of the invention;
Fig. 7 is the schematic diagram that blue light-emitting diode tube core and red light-emitting diode tube core are arranged at different planes;
Fig. 8 is the schematic diagram that white light LEDs has multiple optical lenses.
Main element symbol description
10 white light LEDs
12 base plate for packaging
13 grooves
14 electronic components
15 reflection layers
18 resins
20 blue light-emitting diode tube cores (diode crystal particle)
22 red light-emitting diode tube cores
24 phosphor powder layers
26 bonding wires
28 adhesive cushions
29 metal wires
31 rectifiers
32a ~ 32d LED core
34 filter capacitors
36 current-limiting resistances
37 bonding wires
38 adhesive cushions
39 conductor wires
40 LED core
42 substrates
44 LED unit
46 wires
48 adhesive cushions
50 luminous junctions
60,61,62 curves
64 hatched example areas
66,68 determine electric current
70 blue light-emitting diode unit
72 red light-emitting diode unit
Embodiment
Fig. 1 shows a white light LEDs 10 of implementing according to the present invention.White light LEDs 10 can be a COB (circuit-on-board) encapsulation, and it includes a base plate for packaging (submount) 12, a rectifier 31, four LED core 32a ~ 32d, a filter capacitor 34, a current-limiting resistance 36, adhesive cushion (bonding pad) 38 and electric connection structures.Electric connection structure is made up of the conductor wire on base plate for packaging 12 (conductive strips) 39 and 37 of bonding wires (bonding wire).Fig. 2 shows the equivalent circuit diagram of the white light LEDs 10 of Fig. 1.
High pressure civil power (such as 110ACV or 120ACV) AC exchanging, can input by the adhesive cushion 38 from base plate for packaging 12, and the electric energy of white light LEDs 10 is provided.Rectifier 31 can be a bridge rectifier (bridge rectifier), is adhered on base plate for packaging 12, can be used for, by the high pressure civil power AC exchanging, converting direct supply to.Current-limiting resistance 36 controllable flows are through the magnitude of current of white light LEDs 10.Filter capacitor 34 can be used to the cross-pressure of two output terminals of stablizing rectifier 31, to provide stable voltage to LED core.LED core 32a ~ 32d is arranged on base plate for packaging 12, and utilizes a bonding wire 37 to connect to make LED core 32a ~ 32d become a cascaded structure, and the electric current of each LED core that makes to flow through is the same.At least one is red light-emitting diode tube core for LED core 32a ~ 32d, and all the other are blue light-emitting diode tube cores.By electric connection structure, the direct supply on filter capacitor 34 can provide electric current to make LED core 32a ~ 32d can be luminous.
Fig. 3 shows the tangent plane schematic diagram of the white light LEDs 10 of Fig. 1 for example.Base plate for packaging 12 can be one to have the ceramic substrate of good coefficient, and its technology can be made by modes such as thick film manufacture craft (thick film), low temperature co-fired manufacture craft (LTCC) and film producing process.On base plate for packaging 12, can be formed with the metal wire (metal strip) 29 being formed with plate making or photoetching making technique.In the present embodiment, in the groove 13 on base plate for packaging 12, a blue light-emitting diode tube core 20 and a red light-emitting diode tube core 22 have been placed.In this embodiment, blue light-emitting diode tube core is a kind of light emitting diode, can send the first light, its center emission wavelength approximately at 430nm between 480nm; Red light-emitting diode tube core is another kind of light emitting diode, can send the second light, its center emission wavelength approximately at 600nm between 660nm.Blue light-emitting diode tube core 20 is provided with a phosphor powder layer 24, the first light that it can be sent by blue light-emitting diode tube core 20, for example blue light or UV, institute excites and sends the third light, for example gold-tinted or green-yellow light (its center emission wavelength approximately at 540nm between 590nm).In the embodiments of figure 3, phosphor powder layer 24 is not formed on red light-emitting diode tube core 22.Transparent or semitransparent resin 18 is enclosed in blue light-emitting diode tube core 20 and red light-emitting diode tube core 22 in groove 13.Resin 18 also can be used as an optical lens, controls the emergent light angle of white light LEDs.In another embodiment, fluorescent powder can roughly be distributed in resin 18 equably, covers on blue light-emitting diode tube core 20 and red light-emitting diode tube core 22 simultaneously.One reflection layer 15 is formed on groove 13, and it can reflect blue LED core 20 and the light that sends toward reflection layer 15 directions of red light-emitting diode tube core 22, and then increases the brightness of illumination toward resin 18 directions.Blue light-emitting diode tube core 20 is connected with the bonding wire (bonding wire) 26 of red light-emitting diode tube core 22 use gold or copper.Bonding wire 26 also provides blue light-emitting diode tube core 20 and red light-emitting diode tube core 22 being electrically connected to the metal wire 29 on base plate for packaging 12.Electronic component 14, can be a rectifier, a resistance or an electric capacity etc., is arranged on two metal wires 29.Some metal wires 29 can be as an adhesive cushion 28, as the input of high pressure civil power AC.
Fig. 4 shows a LED core 40 for example, its can be LED core 32a ~ 32d in Fig. 1 one of them.Substrate (substrate) 42 can be a sapphire substrates, has with semiconductor fabrication process and formed several LED unit 44, wire 46 and adhesive cushion 48 on it.An array can be lined up in substrate 42 in LED unit 44, sends the light of about same spectra.Each LED unit 44 has a luminous junction 50, and its semiconductor material can determine the glow color of LED unit 44.For instance, AlGaInP is suitable for a red-light LED unit, and that InGa1N is suitable for is one dark green, blue, purple and ultraviolet leds unit.Wire 46 is cascaded LED unit 44, also LED unit 44 is electrically connected to adhesive cushion 48.
Fig. 5 shows the correlated colour temperature T of the white light LEDs 10 of Fig. 1
nwith power ratio R
wrelation, wherein T
nrepresent with absolute temperature.In this instructions, power ratio R
wmean in a white light LEDs, the electric power that all blue light-emitting diode tube cores consume (is assumed to W
b), the electric power that all red light-emitting diode tube cores are consumed (is assumed to W
r) ratio, i.e. R
w=W
b/ W
r.In Fig. 5, curve 60 (star-like), 61 (rhombuses) and 62 (square) are the measurements of three kinds of white light LEDs implementing according to the present invention.In the present embodiment, blue light luminous efficiency EF
b, be the per unit electric power that blue light-emitting diode consumes, the luminous flux of the blue light that produces; White-light emitting efficiency EF
w, be the per unit electric power that blue light-emitting diode consumes, the blue light producing (the first light) and phosphor powder layer produce green-yellow light (the third light), the luminous flux after mixing; Red light-emitting efficiency EF
r, be the per unit electric power that red light-emitting diode consumes, the luminous flux of the ruddiness that produces (the second light).Luminescence efficiency ratio is defined as, white-light emitting efficiency EF
wto red light-emitting efficiency EF
rratio.The luminescence efficiency measuring in Fig. 5 is than (EF
w/ EF
r), be respectively 0.8 (curve 60), 1 (curve 61) and 1.2 (curves 62).Curve 60 is expressed as R
w=7.67*ln (T
n)-56.6; 62 of curves represent R
w=5.01*ln (T
n)-37.2.Hatched example areas 64 is between curve 60 and 62.According to wished to get correlated colour temperature (or power ratio R
w), utilize curve 61,62,63, make the power ratio R of white light LEDs 10
w(or correlated colour temperature T
n) falling into hatched example areas 64, the CRI of white light LEDs 10 also can reach more than 85 simultaneously.
In the time that an illuminator need to reach a correlated colour temperature, Fig. 5 can determine the quantity of blue light-emitting diode tube core and red light-emitting diode tube core in a white light LEDs.For instance, suppose that each blue light-emitting diode tube core has 12 blue led unit, the forward operating voltage V of each blue led unit
fbe approximately 3.1 volts, each red light-emitting diode tube core has 6 red LED unit, the forward operating voltage V of each red LED unit
fit is approximately 2 volts.So, forward operating voltage that can the each blue light-emitting diode tube core of inference is approximately 37.2 volts (=3.1V*12), and the forward operating voltage of each red light-emitting diode tube core is approximately 12 volts (=2V*6).If want the correlated colour temperature T reaching
nbe 4000 ° of K, according to Fig. 5, power ratio R
wshould be between 7.015 to 4.353.Therefore, if 5 blue light-emitting diode tube cores, 3 the red light-emitting diode tube cores of connecting, the power ratio R producing
wto approximate 5.16 (=37.2*5/ (12*3)), the about 222V of forward operating voltage (=37.2*5+12*3) of entirety, just can approximately be applicable to electric main and be 220 or the bulb illumination application of 240ACV, to reach correlated colour temperature be 4000 ° of K and have high CRI.
Although in the embodiment in Fig. 2, all LED unit are to be all cascaded, and the present invention is not limited to this.Fig. 6 shows according to an alternative embodiment of the invention, and wherein, blue light-emitting diode unit 70 is cascaded, and is determined electric current 66 and drives; Red light-emitting diode unit 72 is cascaded, and is determined electric current 68 and drives.Blue light-emitting diode unit 70 can be co-located on a base plate for packaging with red light-emitting diode unit 72, by the plain conductor on base plate for packaging or bonding wire, reaches the structure of serial or parallel connection.Determine electric current 66 and determine electric current 68 to make the power ratio R of blue light-emitting diode unit 70 to red light-emitting diode unit 72
w, fall into the hatched example areas 64 of Fig. 5, can reach desirable relative colour temperature and CRI.Blue light-emitting diode unit 70 can be all at a blue light-emitting diode tube core or point at several blue light-emitting diode tube cores.Similarly, red light-emitting diode unit 72 can be all at a red light-emitting diode tube core or point at several red light-emitting diode tube cores.In the embodiment of Fig. 6, blue light-emitting diode unit 70 is equal to 72 parallel connections of red light-emitting diode unit.Because flow through, the electric current of blue light-emitting diode unit 70 is separate with the electric current of red light-emitting diode unit 72, so, as long as select suitable number of diodes and determine size of current, by power ratio R
wbe adjusted in hatched example areas 62, can reach desirable relative colour temperature.
In one embodiment of this invention, the blue light (the first light) that blue light-emitting diode tube core produces and phosphor powder layer produce green-yellow light (the third light), mix a white light.The white-light emitting efficiency EF of white light
wbetween every watt of 100 lumens between 200 lumens, and the red light-emitting efficiency EF of the ruddiness that each red light-emitting diode tube core sends (the second light)
rbetween every watt of 100 lumens, between 200 lumens, and the base plate for packaging temperature operation of white light LEDs is in 60 degree C between 100 degree C.In one embodiment, red light-emitting efficiency EF
rand white-light emitting efficiency EF
wall be greater than every watt of 100 lumens.
In one embodiment of this invention, the phosphor powder layer that to be used for changing blue light that a blue light-emitting diode tube core sends be gold-tinted or green-yellow light, fluorescent powder wherein include in the groups of elements being formed by Mg, Ca, Ba, Sr, Zn, Pr, Nd, Dy, Er, Ho, Y, Ce, Al at least one of them.Phosphor powder layer can only have a kind of phosphor material powder of chemical composition, the phosphor material powder that also can be made up of two kinds or above different chemical.
Blue light-emitting diode tube core in Fig. 3 20 and red light-emitting diode tube core 22 be copline be fixed on base plate for packaging 12, but the invention is not restricted to this.In the embodiment of Fig. 7, blue light-emitting diode tube core 20 is arranged in different planes from red light-emitting diode tube core 22, and red light-emitting diode tube core 22 is greater than the distance of blue light-emitting diode tube core 20 with respect to base plate for packaging with respect to the distance of base plate for packaging.Suitably arrange blue light-emitting diode tube core 20 and the position of red light-emitting diode tube core 22 on base plate for packaging, can change the light shape of whole light-emitting device.
LED core in the embodiment of the present invention is also not limited to the optical lens that only has in Fig. 3.Another can have several optical lenses according to embodiments of the invention, is located at one to one in LED core, as shown in Figure 8.
The foregoing is only preferred embodiment of the present invention, all equalizations of doing according to the claims in the present invention change and modify, and all should belong to covering scope of the present invention.
Claims (10)
1. a light-emitting device, it includes:
At least one blue light-emitting diode tube core, can send the first light;
At least one red light-emitting diode tube core, can send the second light; And
Electric connection structure, in order to be electrically connected this blue light-emitting diode tube core and this red light-emitting diode tube core, and makes it luminous; And
Wherein, when this blue light-emitting diode tube core and this red light-emitting diode tube core are when luminous, this blue light-emitting diode tube core and this red light-emitting diode tube core consume respectively one first electric power W
band one second electric power W
r, and the correlated colour temperature of this light-emitting device is T
nabsolute temperature;
Power ratio R
wfor this first electric power W
bto this second electric power W
rratio; And
This power ratio R
wapproximately between 7.67*ln (T
n) – 56.6 to 5.01*ln (T
n) between – 37.2.
2. light-emitting device as claimed in claim 1, wherein, this first light is blue light or ultraviolet ray.
3. light-emitting device as claimed in claim 1, also comprises a phosphor powder layer, is coupled to optically this blue light-emitting diode tube core, excited by this first light, and send the third light.
4. light-emitting device as claimed in claim 3, wherein, this phosphor powder layer is positioned on this blue light-emitting diode tube core and this red light-emitting diode tube core simultaneously.
5. light-emitting device as claimed in claim 3, wherein, this phosphor powder layer is positioned on this blue light-emitting diode tube core, but without position on this red light-emitting diode tube core.
6. light-emitting device as claimed in claim 3, wherein, this phosphor powder layer includes the phosphor material powder of at least two kinds of different chemical compositions.
7. light-emitting device as claimed in claim 3, wherein, this first light and this third light mix as white light, and the luminescence efficiency of this second light and the luminescence efficiency of this white light are all greater than 100 lumens/watt.
8. light-emitting device as claimed in claim 1, also further comprises a base plate for packaging, and wherein, this blue light-emitting diode tube core and this red light-emitting diode tube core copline ground are fixed on this base plate for packaging.
9. light-emitting device as claimed in claim 1, also further comprises a base plate for packaging, and wherein this blue light-emitting diode tube core and this red light-emitting diode tube core are not fixed on to copline on this base plate for packaging.
10. light-emitting device as claimed in claim 9, wherein, this red light-emitting diode tube core is greater than this blue light-emitting diode tube core distance of this base plate for packaging relatively with respect to the distance of this base plate for packaging.
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|---|---|---|---|
| CN201210475615.0A CN103839511B (en) | 2012-11-21 | 2012-11-21 | Light-emitting device and driving method on light emitting diode |
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| CN103839511B CN103839511B (en) | 2018-05-11 |
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| TWI621282B (en) * | 2014-09-11 | 2018-04-11 | 晶元光電股份有限公司 | Light-emitting diode device with fluorine-containing phosphor composition |
| CN109346005A (en) * | 2014-06-26 | 2019-02-15 | Nec照明株式会社 | Organic EL panel control device, light supply apparatus, organic EL panel control method, program and recording medium |
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| CN103839511B (en) | 2018-05-11 |
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