CN107270139A - Light-emitting device and the method for operating light-emitting device - Google Patents
Light-emitting device and the method for operating light-emitting device Download PDFInfo
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- CN107270139A CN107270139A CN201710442177.0A CN201710442177A CN107270139A CN 107270139 A CN107270139 A CN 107270139A CN 201710442177 A CN201710442177 A CN 201710442177A CN 107270139 A CN107270139 A CN 107270139A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/20—Light sources comprising attachment means
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21K—NON-ELECTRIC LIGHT SOURCES USING LUMINESCENCE; LIGHT SOURCES USING ELECTROCHEMILUMINESCENCE; LIGHT SOURCES USING CHARGES OF COMBUSTIBLE MATERIAL; LIGHT SOURCES USING SEMICONDUCTOR DEVICES AS LIGHT-GENERATING ELEMENTS; LIGHT SOURCES NOT OTHERWISE PROVIDED FOR
- F21K9/00—Light sources using semiconductor devices as light-generating elements, e.g. using light-emitting diodes [LED] or lasers
- F21K9/60—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction
- F21K9/64—Optical arrangements integrated in the light source, e.g. for improving the colour rendering index or the light extraction using wavelength conversion means distinct or spaced from the light-generating element, e.g. a remote phosphor layer
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2113/00—Combination of light sources
- F21Y2113/10—Combination of light sources of different colours
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21Y—INDEXING SCHEME ASSOCIATED WITH SUBCLASSES F21K, F21L, F21S and F21V, RELATING TO THE FORM OR THE KIND OF THE LIGHT SOURCES OR OF THE COLOUR OF THE LIGHT EMITTED
- F21Y2115/00—Light-generating elements of semiconductor light sources
- F21Y2115/10—Light-emitting diodes [LED]
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- Microelectronics & Electronic Packaging (AREA)
- Optics & Photonics (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
One embodiment of the invention discloses a kind of light-emitting device, and it includes one first light source, and one first light can be sent under one first low temperature and one first high temperature by being set, and with one first hot cold coefficient；One secondary light source, one second light can be sent under this first low temperature and this first high temperature by being set, and with a second hot cold coefficient for being more than this first hot cold coefficient；And an optical element, being set can be excited to produce one the 3rd light and can reach second high temperature for being higher than this first high temperature in the case where being irradiated by this first light by this first light.
Description
The application be the applying date on 08 31st, 2012, it is Application No. 201210319939.5, entitled " luminous
The divisional application of the application for a patent for invention of device ".
Technical field
The present invention is, on a kind of light-emitting device, to perceive less illumination to the variation of its colour temperature especially with regard to a kind of user and fill
Put, for example using multicolour light emitting diode lighting device.
Background technology
Use light emitting diode (Light-Emitting Diode；LED) forming white light has several means.One is using
More than three kinds monochromatic (Monochromatic Color) light sources produce white light, for example, red, blueness and the pole of green emitting two
Pipe.Another way is to mix two kinds of coloured light each other for complementary colours (Complementary Color), for example, blue light and Huang
Light.Generally, blue light is produced by iii-nitride light emitting devices, and gold-tinted is produced by the fluorescent material excited by blue light.Utilize
In general the white light of two kinds of complementary color light source outputs has higher hair compared to the white light using three kinds of monochromatic source outputs
Light efficiency (Luminous Efficiency) but color rendering index (Color Rendering Index；CRI it is) poor.
Color rendering (Color Rendering) is to weigh the finger that photographed object realistic colour is presented compared to daylight for a light source
Mark.Has the light source of high color rendering index compared with the real color of object can be showed.Halogen lamp LED (Halogen Lamp) and incandescent lamp
Bubble (Incandescent Bulb) is that have preferable color rendering person in current artificial light sources, and its color rendering index is up to 100.It is glimmering
The color rendering index of light lamp (Fluorescent Light) is generally between 60~85.Blue LED collocation yellow fluorescence
White light its color rendering index produced by powder then only up to 70 or so.Blue LED more than two kinds fluorescent material of collocation, for example,
Yellow and red fluorescence powder, although its color rendering index can be improved to 80 or so, but luminous efficiency can be made to reduce about 30%.
The content of the invention
One embodiment of the invention discloses a kind of light-emitting device, comprising：Light source, sends the first light at a temperature of first；
And optical element, excited by first light to produce the second light, the beeline between the optical element and the light source is D,
And D>0, wherein, the optical element can reach a second temperature for being higher than first temperature in the case where being irradiated by first light.
One embodiment of the invention discloses a kind of method for operating light-emitting device, comprising：Offer can send the first light
Beeline between light source and optical element, and the light source and the optical element is D, and D>0；And first light irradiates the light
Learn element and produce the second light, until the temperature of the light source and the optical element reaches stable state or intends quasi-stability, wherein, the temperature
During for stable state or plan quasi-stability, the light source has the first temperature, and the optical element has second temperature, and the second temperature is higher than
First temperature.
One embodiment of the invention discloses a kind of light-emitting device, and it includes one first light source, and being set can be low in one first
One first light is sent under temperature and one first high temperature, and with one first hot cold coefficient；One secondary light source, be set can in this
One second light is sent under one low temperature and this first high temperature, and with a second hot cold coefficient for being more than this first hot cold coefficient；
And an optical element, being set can be excited to produce one the 3rd light and in the case where being irradiated by this first light by this first light
Second high temperature for being higher than this first high temperature can be reached.
In an alternative embodiment of the invention, this first light, this second light and this 3rd light can be mixed into one
Mixed light, this mixed light is between this first low temperature and this first high temperature, and the difference of its chromaticity coordinate is (△ x, △ y), △ y/ △ x
More than -0.2.
In an alternative embodiment of the invention, this first light, this second light and this 3rd light can be mixed into one
Mixed light, this mixed light under this first low temperature have one first chromaticity coordinate, under this first high temperature have one second colourity
Coordinate, this first chromaticity coordinate and this second chromaticity coordinate are to be located at the both sides of blackbody radiance curve respectively.
In an alternative embodiment of the invention, this first light, this second light and this 3rd light can be mixed into one
Mixed light, this mixed light under this first low temperature have one first chromaticity coordinate, under this first high temperature have one second colourity
Coordinate, this first chromaticity coordinate and this second chromaticity coordinate are the homonymies positioned at blackbody radiance curve.
In an alternative embodiment of the invention, this first light, this second light and this 3rd light can be mixed into one
Mixed light, this mixed light under this first low temperature have one first chromaticity coordinate, under this first high temperature have one second colourity
The line of coordinate, this first chromaticity coordinate and this second chromaticity coordinate is to be in substantially parallel relationship to blackbody radiance curve.
In another embodiment of the present invention, this first light, this second light and this 3rd light can be mixed into one
Mixed light, this mixed light is in having one first correlated colour temperature under this first low temperature, in related with one second under this first high temperature
Colour temperature, this second correlated colour temperature is more than this first correlated colour temperature.
In another embodiment of the present invention, the difference of this first high temperature and this second high temperature is between 30 DEG C~40 DEG C.
In yet another embodiment of the present invention, this first light includes blue light, and this second light includes feux rouges.
In yet another embodiment of the present invention, this optical element includes a material for transformation of wave length, and it may be placed at this
On optical element and away from this secondary light source.
In yet another embodiment of the present invention, this optical element includes a frustum.
Brief description of the drawings
Fig. 1 is the configuration diagram for illustrating the light-emitting device according to one embodiment of the invention；
Fig. 2 is to illustrate the light-emitting device according to further embodiment of this invention；
Fig. 3 is the comparative example for illustrating the light-emitting device according to one embodiment of the invention；And
Fig. 4 is to illustrate the light-emitting device according to yet another embodiment of the invention.
[main element label declaration]
10 first light source 30c phosphor powder layers
The light-emitting device of 20 secondary light source 100
The light-emitting device of 30 optical element 200
The light-emitting device of 30a recesses 300
The light-emitting device of 30b phosphor powder layers 400
30b ' phosphor powder layers
Embodiment
Collocation schema illustrates embodiments of the invention below.
As shown in figure 1, one embodiment of the invention discloses a kind of light-emitting device 100, its comprise at least one first light source 10,
One secondary light source 20 and an optical element 30.Minimum distance between first light source 10 and optical element 30 is D1, secondary light source 20
Minimum distance between optical element 30 can be with equal or difference for D2, D1 and D2.Optical element 30 can for single structure or
Include several independent structures.One light source 10 can produce one first light L1, and it is different (whole that secondary light source 20 can produce one
Or part wavelength is different) in the first light L1 the second light L2.First light L1, the second light L2 or its both can shine
Penetrate optical element 30 (for example, optical element 30 can be covered in the first light source 10, secondary light source 20 or its both on), and
Optical element 30 is set to produce at least one the 3rd light L3 for being different from the first light L1 or the second light L2.If the first light L1
The 4th light L4 (can not also mix, that is, not have the 4th light L4 in schema) can be produced by only being mixed with the 3rd light L3.
First light L1, the second light L2 and the 3rd light L3 (or the 3rd light L3 and the 4th light L4) can be in a locus
On be mixed into one the 5th light L5.This locus can be located at optical element 30 outside and light-emitting device 100 within or send out
Outside electro-optical device 100.Light-emitting device 100 in Fig. 1, the first light source 10, the quantity of secondary light source 20 and optical element 30, size,
Position can be to illustrate, but does not limit the present invention certainly.
For example, light-emitting device 100 is a light source, such as bulb, fluorescent tube；First light source 10 is a light emitting diode, the first light
Line L1 is blue light (being not limited to monochromatic source, as follows also comprising the light source that blue optical band is included in frequency spectrum)；Secondary light source 20
It is another light emitting diode, the second light L2 is that feux rouges (is not limited to monochromatic source, also comprising including red optical band in frequency spectrum
Light source, as follows)；3rd light L3 is that gold-tinted (is not limited to monochromatic source, also comprising the light that yellow optical band is included in frequency spectrum
Source, as follows)；4th light L4 is higher color temperature white light (for example, correlated colour temperature (Correlated Color
Temperature；CCT) it is more than 4000K)；5th light L5 be compared with low color temperature white light (for example, correlated colour temperature be 4000K with
Under).It is that can include be stimulated by blue light and produce the fluorescent material of gold-tinted, such as Yttrium aluminium garnet (YAG) type in optical element 30
(Yttrium Aluminum Garnet；YAG) fluorescent material, silicates (Silicate-based) fluorescent material, terbium aluminium garnet
Type (Terbium Aluminum Garnet；TAG) fluorescent material, nitrogen oxides (Oxynitride) fluorescent material.Institute in this specification
The fluorescent material enumerated respectively has its operating characteristic, and such as Yttrium aluminium garnet (YAG) type fluorescent powder has preferable under high temperature (e.g., more than 100 DEG C)
Luminous efficiency, nitric oxide fluorescent powder has preferably luminous efficiency under middle low temperature (e.g., less than 100 DEG C).Therefore, light
When device 100 is used for the operating environment of high temperature, Yttrium aluminium garnet (YAG) type fluorescent powder can be selected；If being used in the operation ring of middle low temperature
During border, nitric oxide fluorescent powder can be selected.But above selecting suggestions are not absolute, still visual design requirement adjusts it.
For example, light-emitting device 100 is a light source, such as bulb, fluorescent tube；First light source 10 is a light emitting diode, the first light
Line L1 is blue light；Secondary light source 20 is another light emitting diode, and the second light L2 is feux rouges；Three light L3 are that green glow (is not limited to
Monochromatic source, as follows also comprising the light source that green optical band is included in frequency spectrum)；4th light L4 is dark green light (cyan；It is non-
It is limited to monochromatic source, as follows also comprising the light source that blue-green light wave band is included in frequency spectrum)；5th light L5 is white light.Optics
Can be included in element 30 can be stimulated by blue light and produce the fluorescent material of green glow, such as silicates fluorescent material, Yttrium aluminium garnet (YAG) type
Fluorescent material, LuAG (Lutetium Aluminum Garnet), beta-SiAlON.Specific chemical composition is exemplified below：(Sr,
Ba)2SiO4:Eu2+、SrGa2S4:Eu2+、Y2SiO5:Tb、CeMgAl11O19:Tb、Zn2SiO4:Mn、LaPo4:Ce,Tb、Y3Al5O12:
Tb、Y2O2S:Tb,Dy、BaMgAl11O17:Eu,Mn、GdMgZnB5O10:Ce,Tb、Gd2O2S:Tb,Dy。
First light source 10 can have one first hot cold coefficient (Hot/Cold Factor), and secondary light source 20 can have
One is different from the second hot cold coefficient of the first hot cold coefficient.This so-called hot cold coefficient (Hot/Cold Factor), or temperature system
Number (Temperature Coefficient；TC), it is to represent luminous flux of the light source in high temperature divided by the luminous flux in low temperature
Ratio.On the contrary luminous flux during high temperature is less than luminous flux during low temperature, then hot cold coefficient is less than 1, then be more than 1.The cold coefficient of heat
Bigger luminous flux or luminous efficiency are smaller because of the amplitude of temperature damping.For example, the hot cold coefficient of a light emitting diode is X, if with
25 DEG C of luminous flux be reference value, then 100 DEG C when luminous flux will only remain reference value (100*X) %, in other words, luminous flux
Fall is (100-X) %.If input power is constant, luminous flux fall is bigger, and the luminous efficiency of light source is also poorer.
In another embodiment, light-emitting device 100 can be in one first temperature T1And a second temperature T2Emit beam, and
Second temperature T2Higher than the first temperature T1(in T1And T2Between can light or do not light), and the first light source 10 has one first heat
Cold coefficient HC1, secondary light source 20 is with one second hot cold coefficient HC2, and HC1>HC2.First light L1 and the second light L2 are in T1
When luminous flux ratio be FR1, in T2Time flux ratio is FR2, due to the second light L2 by heat fade amplitude compared with the first light
Line L1 is obvious so that FR1<FR2.In T1When the 5th light L5 (can for simple L1 and L2 mixed light or L1, L2 and L3 mixing
Light.) correlated colour temperature be CT1, the 5th light L5 correlated colour temperature is CT when T22, due to the first light L1 and the second light L2
Mixed proportion in T1And T2Difference (FR1≠FR2) so that CT1With CT2Also it is different therewith.Therefore, hot cold coefficient also may shadow
Ring the colour temperature of mixed light.
The operating temperature of light-emitting device 100 often rises as use time increases.What if light-emitting device 100 was sent
Light is included as the coloured light produced by the light source of the hot cold coefficient of several differences, then the colour temperature of the emitted light of light-emitting device 100 is just
It can change because of the change of operating temperature.Change or reach expected colour temperature design to relax colour temperature of the mixed light in high/low temperature
It is required that, present application separately proposes following examples.
In one embodiment of the invention, the minimum distance between the first light source 10 and optical element 30 is D1, secondary light source
Minimum distance between 20 and optical element 30 can be with equal or difference for D2, D1 and D2, and D1 and D2 are all not equal to zero.Optics member
The first light L1 can be converted to the 3rd light L3 material for transformation of wave length 40 by being included in part 30.Material for transformation of wave length 40 be as
Fluorescent material (specific material is such as foregoing), dyestuff, semiconductor.Material for transformation of wave length 40 has specific conversion efficiency, will swash
Luminous (such as the first light L1) is converted into transmitting light (such as the 3rd light L3) according to certain proportion, and is not converted into swashing for transmitting light
It is luminous then possibly off material for transformation of wave length 40 or be converted into heat and the temperature of optical element 30 is increased.If wavelength convert material
The temperature of material 40 or optical element 30 is higher than the temperature of light source, makes it away from light source or separates the two also with a transparent heat-insulated material
The heat for being transferred to light source can be reduced.Once the temperature drop of light source just can slow down the influence to colour temperature because of hot cold coefficient.Instead
It, if the temperature of optical element 30 is less than the temperature of light source, makes optical element 30 close to light source to absorb the heat of light source, just can be with
The temperature of light source is reduced, influence of the hot cold coefficient to colour temperature can also be slowed down.
Light-emitting device 200 as illustrated in Figure 2, the first light source 10 is a blue LED, and secondary light source 20 is one
Red light emitting diodes, and hot cold coefficient of the hot cold coefficient more than secondary light source 20 of the first light source 10.Optical element 30 is one
The frustum (frustum) of inverted cone (reversed cone), thereon and with a recess 30a, recess 30a is interior and is provided with
One phosphor powder layer 30b.First light source 10 and secondary light source 20 can be optionally placed on a carrier 50.Carrier 50 be as
Printed circuit board (PCB) (Printed Circuit Board；PCB), ceramic substrate, metal substrate, plastic base, glass, silicon substrate
Deng.Between optical element 30 and carrier 50 in addition to light emitting diode, other materials, such as colloid, Heat Conduction Material, light scattering are still filled
Material etc..In an embodiment, the first light source 10 and secondary light source 20 by coming into operation until light source and optical element at room temperature
30 temperature reaches stable state (Steady State) or intends quasi-stability (Quasi-Steady State).
For example, optical element 30 is frustum as shown in Figure 2, diameter (Dt) is about 17 millimeters thereon, lower diameter
(Db) be about 8 millimeters, height H be about 5 millimeters (that is, the distance of the first light source of phosphor powder layer 30a distances 10 and secondary light source 20
About 5 millimeters).Initially, the first light source 10 and secondary light source 20 are come into operation by 25 DEG C or so and send blue light and feux rouges respectively,
Blue light can excite optical element 30 to produce gold-tinted, also, blue light, feux rouges and gold-tinted can be mixed into a low color temperature white light, and it is related
Colour temperature is about 2500K, CIE (x1, y1)initialChromaticity coordinate is about (0.4733,0.4047).After several minutes, temperature is no longer bright
It is aobvious to rise.Now, the temperature of the first light source 10 and secondary light source 20 is about 70 DEG C~90 DEG C, and the temperature of optical element 30 is about
100 DEG C~130 DEG C, so the temperature of the first light source 10 and secondary light source 20 is all lower than optical element 30 about 30 DEG C~40 DEG C.In
Under this steady temperature, blue light, feux rouges and gold-tinted can blend a high color temperature white light, and its correlated colour temperature is about 3000K, CIE (x1,
y1)stableChromaticity coordinate is about (0.4395,0.4104).That is, by low temperature to high temperature, the correlated colour temperature gap of white light is about
500K, the change of chromaticity coordinate (△ x1, △ y1) is about (- 0.0339,0.0057), and △ y1/ △ x1 are approximately equal to -0.17.Due to
△ x1 are much larger than △ y1 (0≤△ y1/ △ x1≤- 0.2) so that the slope of colourity changes in coordinates relatively delays between low temperature and high temperature,
CIE(x1,y1)initialAnd CIE (x1, y1)stableThe line of chromaticity coordinate can parallel or less parallel blackbody radiance curve.Also
I.e. the chromaticity coordinate line of low temperature and high temperature can pass through black body radiation song in the one side of blackbody radiance curve, or with less slope
Line.In this example, CIE (x1, y1)initialBelow black body radiation line, CIE (x1, y1)stableAbove black body radiation line.
Than if without using optical element 30, fluorescent material is directly covered on the first light source 10 and secondary light source 20
(that is, fluorescent material is not away from light source), but other conditions are constant, the CIE (x2, y2) of low color temperature white lightinitialChromaticity coordinate is about
(0.4806,0.43), the CIE (x2, y2) of high color temperature white lightstableChromaticity coordinate is about (0.4531,0.4504), the phase of white light
Though closing color temperature difference away from still about 500K, the change of chromaticity coordinate (△ x2, △ y2) is but about (- 0.0275,0.0204), △ y2/
△ x2 are approximately equal to -0.74.The steeper slope of colourity changes in coordinates between low temperature and high temperature, the mobile line segment of chromaticity coordinate or its prolong
Blackbody radiance curve can be passed through by stretching line.And because △ y2 are much larger than △ y1 (△ y2/ △ y1=3.58) so that (x2, y2) court
The mobile amplitude of green wavelength (520nm~560nm) is more than (x1, y1) in chromaticity coordinate.Because human eye is more quick for green glow
Sense, therefore, the knots modification of green glow is bigger, and human eye, which is cured, can discover the change of light color or colour temperature.
Further, since also light source will be made to reduce temperature, Jin Erti away from thermal source away from light source optical element 30
Rise its luminous efficiency.For example, such as Fig. 2 design, by low temperature to high temperature, the luminous efficiency appointment of light-emitting device 200 declines 24%.
But, after such as phosphor powder layer 30b ' is directly covered on the first light source 10 and secondary light source 20, then optical element 30 is covered, then sent out
The luminous efficiency of electro-optical device 300 will reduce by 27%, as shown in Figure 3.
By being, configuration or method using the above embodiment of the present invention can reduce the sensitivity that human eye changes for colour temperature
Degree, and the luminous efficiency of light source can be improved.
In another embodiment of the present invention, as shown in figure 4, light-emitting device 400, the first light source 10 is the pole of a blue-light-emitting two
Pipe, secondary light source 20 is a red light emitting diodes.Optical element 30 is the frustum of an inverted cone, thereon and recessed with one
In mouthful 30a, recess 30a and frustum side surface and provided with a phosphor powder layer 30c.First light source 10 and secondary light source 20 can
To be optionally placed on a carrier 50.Carrier 50 be as printed circuit board (PCB), ceramic substrate, metal substrate, plastic base,
Glass, silicon substrate etc..Between optical element 30 and carrier 50 in addition to light emitting diode, other materials, such as colloid, heat conduction are still filled
Material, light-scattering material etc..Because the top and side of optical element 30 all cover phosphor powder layer 30c, luminous dress can be caused
Put 100 color over and under more uniform.For example, the chromaticity coordinate (△ u ', △ v ') of light-emitting device 400400About
(0.010,0.014), and light-emitting device 200 (Du ', Dv ')200About (0.014,0.023).If in addition, in optical element
30th, phosphor powder layer 30c or the two in add scattering material, such as TiO2, also contribute to form the more uniform light field of color.
Though more than each schema and explanation only corresponding specific embodiment respectively, however, illustrated by each embodiment or exposure
Element, embodiment, design criteria and technical principle except showing mutually conflict, contradiction each other or in addition to being difficult to common implementing,
We when can according to needed for it is any with reference to, exchange, collocation, coordinate or merge.
Although the present invention is it is stated that as above, scope, implementation order or the material used that so it is not intended to limiting the invention
Material and manufacturing method thereof.The various modifications and change made for the present invention, neither take off spirit and scope of the invention.
Claims (10)
1. a kind of light-emitting device, comprising：
Light source, sends the first light at a temperature of first；And
Optical element, is excited to produce the second light by first light, and the beeline between the optical element and the light source is
D, and D>0,
Wherein, the optical element can reach a second temperature for being higher than first temperature in the case where being irradiated by first light.
2. light-emitting device according to claim 1, wherein first temperature range approximately from 70 DEG C~90 DEG C.
3. light-emitting device according to claim 1, the wherein second temperature range approximately from 100 DEG C~130 DEG C.
4. light-emitting device according to claim 1, the wherein light-emitting device include bulb or fluorescent tube.
5. light-emitting device according to claim 1, wherein first light and second light mixing after produce white light or
Dark green light.
6. light-emitting device according to claim 1, the wherein optical element include a material for transformation of wave length.
7. light-emitting device according to claim 1, the wherein light-emitting device under higher temperature have higher colour temperature.
8. light-emitting device according to claim 1, the wherein optical element have a width for being more than the light source.
9. a kind of method for operating light-emitting device, comprising：
The light source and optical element of the first light can be sent by providing, and the beeline between the light source and the optical element is D, and
D>0；And
First light irradiates the optical element and produces the second light, until the temperature of the light source and the optical element reaches stable state
Or plan quasi-stability,
Wherein, when the temperature is stable state or intends quasi-stability, the light source has the first temperature, and the optical element has second temperature,
And the second temperature is higher than first temperature.
10. method according to claim 9, wherein the first colour temperature is obtained in measuring the light-emitting device under an original state,
The second colour temperature is obtained in measuring the light-emitting device under the stable state or the plan quasi-stability, second colour temperature is higher than first colour temperature.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710442177.0A CN107270139B (en) | 2012-08-31 | 2012-08-31 | Light emitting device and method for operating a light emitting device |
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|---|---|---|---|
| CN201210319939.5A CN103672450B (en) | 2012-08-31 | 2012-08-31 | Light-emitting device |
| CN201710442177.0A CN107270139B (en) | 2012-08-31 | 2012-08-31 | Light emitting device and method for operating a light emitting device |
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Also Published As
| Publication number | Publication date |
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| CN107270139B (en) | 2020-11-06 |
| CN103672450B (en) | 2017-07-04 |
| CN103672450A (en) | 2014-03-26 |
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