CN101677117A - Method for configuring high color rendering light emitting diode and system - Google Patents
Method for configuring high color rendering light emitting diode and system Download PDFInfo
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- CN101677117A CN101677117A CN200810211254A CN200810211254A CN101677117A CN 101677117 A CN101677117 A CN 101677117A CN 200810211254 A CN200810211254 A CN 200810211254A CN 200810211254 A CN200810211254 A CN 200810211254A CN 101677117 A CN101677117 A CN 101677117A
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Abstract
The invention provides a method for configuring a high color rendering light emitting diode and a system, which mainly uses an algorithm to calculate the respective concentration of at least more thantwo kinds of fluorescent powders capable of being mixed with the light emitting diode. The luminescence spectrum after light mixing can provide high color rendering white light with a preset color temperature. One purpose of the invention is to provide the method for quickly preparing the high color rendering light emitting diode by mixing a plurality of kinds of fluorescent powders and the system by the calculation of software, thereby reducing the time cost of trial and error.
Description
Technical field
The present invention relates to a kind of high color rendering light emitting diode, relate in particular to a kind of collocation method and system of high color rendering light emitting diode.
Background technology
Light-emitting diode (Light Emitting Diode; Be called for short LED), be a kind ofly electric energy can be converted into the electronic component of luminous energy, and possess the characteristic of diode simultaneously.When generally giving direct current, light-emitting diode can be stably luminous, if but connect alternating current, light-emitting diode can present the kenel of flicker, and the frequency of flicker is decided according to the frequency of input AC electricity.The principle of luminosity of light-emitting diode is an applied voltage, makes electronics with after the hole combines in semiconductor, and the form of energy with light discharged.
The composition of light-emitting diode chip for backlight unit mainly comprises the semiconducting compound of three races's arsenide, three races's phosphide, III-nitride or II-VI family etc. at present.Be accompanied by the difference of light-emitting diode chip for backlight unit manufactured materials, the energy that the photon that generates has is also different, therefore controls the luminous wavelength of light-emitting diode chip for backlight unit by manufactured materials, and then produces the various light-emitting diode chip for backlight unit of different spectrum and color.Present global industry development go out different types of light-emitting diode chip for backlight unit can launch from the infrared ray to the blue light between the light of different wave length, and purple is to the technology of ultraviolet light-emitting diode chip for backlight unit also in the maturation.The main emphasis of above-mentioned light-emitting diode is at monochromatic light, or the light-emitting diode of single-frequency.The luminous frequency spectrum of white light emitting diode no longer is to concentrate on a certain monochromatic light, but a distribution is arranged in the frequency spectrum of visible light.How chip-shaped the combination that is used for forming white light emitting diode at present mainly be divided into and two types on single-chip type.
Multicore sheet type is mixed this three kinds of light by lens, and then is produced our being seen white light with the light-emitting diode chip for backlight unit of red, green and blue three looks.Its advantage is a high luminous efficiency and photochromic adjustable, and shortcoming is three kinds of chips of palpus, and each chip chamber has the rate of decay and the life-span of individual circuits design and three kinds of chips to be not quite similar, and is difficult to control the life-span of white light emitting diode.
In addition, produce white light with the single-chip type and then can be divided into three kinds of modes.First kind of mode also is the mode of main flow, with blue led chips irradiation yellow fluorescent powder, fluorescent material excited and sends white light.Such product when adjusting the CIE value of light-emitting diode, choosing to the wavelength of blue light-emitting diode and yellow fluorescent powder excite frequency spectrum after, need only the luminous intensity of adjustment blue light-emitting diode and the concentration of yellow fluorescent powder.Such spectrum that white light emitting diode produced, the luminosity of red area are too weak and cause on average drilling colour system number (General Color Rendering Index; Ra) value is on the low side.For example, this product is applied in the secondary light source of digital camera, the physiognomy of then taking pictures does not often have color.Therefore, present high color rendering white light emitting diode becomes the direction of present stage all circles' pursuit.
In order to remedy the luminosity of red area, follow-up derive with blue led chips irradiation green and red fluorescence powder or produce white light with blue led chips irradiation green and yellow fluorescent powder improve that on average to drill the colour system number be the second way.The third mode then produces white light with green, the red and blue three kinds of fluorescent material of ultraviolet light-emitting diodes chip irradiation.
A kind of mode sees also United States Patent (USP) notification number US 2007/0194695A1, and it arranges in pairs or groups an orange inorganic fluorescent powder and green inorganic fluorescent powder to produce white light with blue led chips.The mixed proportion of its orange inorganic fluorescent powder and green inorganic fluorescent powder can the proportioning adjustment and increase fluorescent material absorbing wavelength width and reach nearly true white light, for example excite (Se via Zn with blue led chips
0.1, S
0.9): the fluorescent material that the green inorganic fluorescent powder of the orange inorganic fluorescent powder of Cu and Eu-activated β-sialon mixes
Another kind of mode sees also TaiWan, China patent announcement I263360, and wherein excitation source can send wavelength between the light source between 258nm to 490nm, and fluorescent material then is disposed at around the excitation source, to receive the light that excitation source was sent.Its fluorescent material comprises green emitting phosphor, fuchsin light (Magenta) fluorescent material and red light fluorescent powder and blue colour fluorescent powder etc.Wherein, the material of green glow and fuchsin light (Magenta) fluorescent material is selected from (Me
1-x-yEu
xRe
y)
8Mg
z(SiO
4)
mCl
nThe group that is formed one of them or more than two kinds; The material of red light fluorescent powder is selected from (Me
1-x-yEu
xRe
y) group that S formed one of them, the material of blue colour fluorescent powder is selected from (Ca
1-x-yEu
xRe
y)
5(PO
4)
3Cl:Eu
2+Gd
2+The group that is formed one of them; 0＜x≤0.8, and 0≤y≤2.0,0≤z≤1.0,1.0≤m≤6.0,0.1≤n≤3.0.In addition, Me be selected from group that calcium, strontium, barium forms one of them, and Re be selected from group that praseodymium, rubidium, dysprosium, samarium, holmium, yttrium, erbium, europium, thulium, ytterbium, gold-plating, gadolinium, magnesium, manganese form one of them or more than two kinds.After above-mentioned four kinds of suitable proportionings of fluorescent material with the purple light of wavelength 385nm as exciting light, and then form one or four wavelength and the good white light of color rendering.
In above-mentioned mode, the production method of wanting to reach high color rendering light emitting diode can be the fluorescent material that increases redness or uses two or more fluorescent material etc.Yet when using two kinds of fluorescent material mixed lights to produce the light source of specific CIE value by light-emitting diode, always having three kinds of parameters need adjust simultaneously, just the concentration of the luminous intensity of light-emitting diode and two fluorescent material.In order to reach certain specific CIE value and color rendering, the mode that need carry out trial and error (trial-and-error) repeatedly goes to adjust the concentration ratio between the different fluorescent material and the luminous intensity of blue light-emitting diode.For example in the prior art of above-mentioned TaiWan, China patent announcement I263360, just advised four kinds of fluorescent material, need mix the process of specific CIE value, needing can increase with the form of index through the time of trial and error.In addition, under different colour temperatures, want to provide the white light emitting diode of better color rendering, need more time to go to attempt out best fluorescent material concentration.
When the fluorescent material kind that develops on the market is more and more many, or wish to use two or more fluorescent material to carry out mixed light, allocate different types of fluorescent material and to reach development time of high color rendering light emitting diode also more and more long.For the listing of product, be undoubtedly sizable challenge.
Summary of the invention
In above-mentioned background of invention, in order to meet the demand of industry interests, the invention provides a kind of method that disposes high color rendering light emitting diode, its step comprises calculates a standard frequency spectrum earlier, and wherein standard frequency spectrum is the visible light transmitted by black-body radiation frequency spectrum under one first colour temperature.Afterwards, provide the emission spectrum of a light-emitting diode, the emission spectrum of one first fluorescent material, and the emission spectrum of one second fluorescent material.Adjust the concentration of first fluorescent material and second fluorescent material and obtain one first mixed light frequency spectrum by standard frequency spectrum, make win mixed light frequency spectrum and standard frequency spectrum approaching.
The step of above-mentioned this standard frequency spectrum of calculating is to utilize Planck (Planck) equation to calculate and get.The first above-mentioned mixed light frequency spectrum is by light-emitting diode, and first fluorescent material and obtains after the second fluorescent material exciting radiation.After obtaining this first mixed light frequency spectrum, calculate the color rendering of the first mixed light frequency spectrum earlier at each Standard colour board, find out the poorest colour table correction first fluorescent material of color rendering and the concentration of second fluorescent material then, thereby obtain one second mixed light frequency spectrum.
The present invention also provides a kind of its step of method that disposes high color rendering light emitting diode to comprise and calculates a standard frequency spectrum earlier, and standard frequency spectrum is the visible light transmitted by black-body radiation frequency spectrum under one first colour temperature.Afterwards, provide the emission spectrum of a light-emitting diode, the emission spectrum of one first fluorescent material, and the emission spectrum of one second fluorescent material.Adjust the concentration of first fluorescent material and second fluorescent material and obtain one first mixed light frequency spectrum by standard frequency spectrum.Calculate the color rendering of the first mixed light frequency spectrum at each Standard colour board.Then, find out the poorest colour table correction first fluorescent material of color rendering and the concentration of second fluorescent material, thereby obtain one second mixed light frequency spectrum.
The present invention also provides a kind of system that disposes high color rendering light emitting diode, comprises in order to calculate the means of a standard frequency spectrum, and standard frequency spectrum wherein is the visible light transmitted by black-body radiation frequency spectrum under one first colour temperature; In order to provide the emission spectrum of a light-emitting diode, the emission spectrum of one first fluorescent material, and the means of the emission spectrum of one second fluorescent material; Obtain the means of one first mixed light frequency spectrum in order to the concentration of adjusting first fluorescent material and second fluorescent material by standard frequency spectrum; In order to calculate the means of the first mixed light frequency spectrum at the color rendering of each Standard colour board; And find out the means of the poorest colour table of color rendering, thereby obtain one second mixed light frequency spectrum in order to the concentration of revising first fluorescent material and second fluorescent material.
The present invention also provides a kind of system that disposes high color rendering light emitting diode, comprises one first database, in order to store the emission spectrum of a light-emitting diode, one first fluorescent material emission spectrum, and one second fluorescent material emission spectrum.One second database is in order to store the reflecting spectrum of each Standard colour board.One colour mixture unit, in order to calculating light-emitting diode in first database, first fluorescent material, and the mixed light frequency spectrum of second fluorescent material, wherein the mixed light frequency spectrum is one first mixed light frequency spectrum.One standard color temperature frequency spectrum generator is in order to be created in the visible light transmitted by black-body radiation frequency spectrum under one first colour temperature.One frequency spectrum comparing unit is in order to compare the standard frequency spectrum that the first mixed light frequency spectrum and standard color temperature frequency spectrum generator are produced.The reflecting spectrum generation unit of one Standard colour board, in order to reading the reflecting spectrum of each Standard colour board in second database, and the first mixed light frequency spectrum and standard frequency spectrum are produced each Standard colour board reflecting spectrum of the first mixed light frequency spectrum and each Standard colour board reflecting spectrum of standard frequency spectrum respectively.One colour table Frequency spectrum ratio is than the unit, in order to each Standard colour board reflecting spectrum of comparing the first mixed light frequency spectrum and each Standard colour board reflecting spectrum of standard frequency spectrum.
Step, means or the system of wherein above-mentioned this standard frequency spectrum of calculating are to utilize Planck (Planck) equation to calculate and get.The first above-mentioned mixed light frequency spectrum is by light-emitting diode, and first fluorescent material and obtains after the second fluorescent material exciting radiation.The first wherein above-mentioned fluorescent material can be CaSc
2O
4: Ce, (MgCaSrBa)
2SiO
4: Eu, Ca
3Sc
2Si
3Ol
2: Ce, (Ca
1.47Mg
1.5Ce
0.03) (Sc
1.5Y
0.5) Si
3Ol
2Or (Ca
2.97Ce
0.03) Sc
2(Si, Ge)
3O
12The second wherein above-mentioned fluorescent material can be CaAlSiN
3: Eu, (CaEu) AlSiN
3, (SrCa) AlSiN
3: Eu or SrGa
2S
4: Eu.The present invention can comprise one the 3rd fluorescent material and emission spectrum thereof.
The present invention also provides a kind of multi-fluorescence powder concentration of calculating to obtain the method for high color rendering light emitting diode, comprise the concentration of adjusting the multi-fluorescence powder make with a light-emitting diode mixed light after frequency spectrum near the luminous frequency spectrum of black body radiation under one first colour temperature, and find out frequency spectrum the poorest colour table of color rendering in the reflecting spectrum of each Standard colour board behind the mixed light, so as to revising the concentration of above-mentioned multi-fluorescence powder.
The present invention also provides a kind of two stage approximate method of various fluorescent material in the allotment ratio of high color rendering light emitting diode of finding out of using, comprise the mixed proportion that mixes near the various fluorescent material of black body radiation, and from the allotment ratio of the poorest various fluorescent material of colour table correction of color rendering.
An object of the present invention is to utilize the calculating of software can mix mode and the system that the multiple fluorescent material of use blendes together high color rendering light emitting diode fast, to reduce the time cost of trial and error.
Description of drawings
Fig. 1 shows the schematic diagram of CIE 1931 colourities;
The distribution schematic diagram of colour temperature in the colourity diagram that Fig. 2 black body radiation is different;
Fig. 3 shows that a kind of multi-fluorescence powder concentration of calculating of the present invention is to obtain the method flow diagram of high color rendering light emitting diode;
Fig. 4 shows a kind of method flow diagram that disposes high color rendering light emitting diode of the present invention;
Fig. 5 shows a kind of system block diagram that disposes high color rendering light emitting diode of the present invention;
Fig. 6 shows the compound method flow chart of high color rendering white light emitting diode of the present invention;
Fig. 7 shows the compounding system block diagram of emission spectrum similarity of the present invention high color rendering white light emitting diode relatively;
Fig. 8 shows the schematic diagram of the mixing emission spectrum of light-emitting diode chip for backlight unit and two kinds of different fluorescent material concentration;
The visible light spectrum of the black body radiation of Fig. 9 display-object colour temperature and the comparison diagram that mixes emission spectrum;
Figure 10 shows the compounding system block diagram of the high color rendering white light emitting diode of drilling the comparison of colour system number; And
Figure 11 shows the system block diagram of configuration high color rendering white light emitting diode of the present invention.
Wherein, description of reference numerals is as follows:
0 finishes
The 31-32 step
The 41-45 step
51 first databases
52 colour mixture unit
53 standard color temperature frequency spectrum generators
54 frequency spectrum comparing units
55 second databases
The reflecting spectrum generation unit of 56 Standard colour boards
57 colour table frequency spectrum comparing units
The 61-65 step
The black body radiation generator of 71 target colour temperatures
72 first databases
73 frequency spectrum computing units
74 frequency spectrum comparing units
76 adjust the concentration of fluorescent material
77 reselect fluorescent material
The black body radiation generator of 100 target colour temperatures
101 first databases
102 frequency spectrum computing units
103 second databases
The reflecting spectrum of 104 Standard colour boards with drill colour system and count computing unit
The reflecting spectrum of 105 mixed light frequency spectrums with drill colour system and count computing unit
106 comparing units
108 adjust the concentration of fluorescent material
109 reselect fluorescent material
The frequency spectrum generator of the black body radiation of 110 target colour temperatures
111 first databases
112 frequency spectrum computing units
113 frequency spectrum comparing units
114 first rank are approximate
115 second databases
The reflecting spectrum color rendering computing unit of 116 Standard colour boards
117 comparing units
The reflecting spectrum color rendering computing unit of 118 mixed light frequency spectrums
119 second rank are approximate
Embodiment
The present invention is a kind of high color rendering white light emitting diode and manufacturing process thereof in this direction of inquiring into.In order to understand the present invention up hill and dale, detailed step and composition thereof will be proposed in following description.Apparently, execution of the present invention is not defined in the specific details that the technical staff was familiar with of light-emitting diode and manufacturing process thereof.On the other hand, well-known composition or step are not described in the details, with the restriction of avoiding causing the present invention unnecessary.The preferred embodiments of the present invention can be described in detail as follows, yet except these were described in detail, the present invention can also be implemented among other the embodiment widely, and scope of the present invention do not limited, and it is as the criterion with appending claims.
From the above, produce white light important element one of them be fluorescent material.And the luminous fluorophor that is of fluorescent material can allow the electronics of fluorophor obtain enough energy through after the exciting of different excitaton sources such as light, electric field, electron beam, and the excitation state of can step being adjourned to higher-energy by ground state can rank.Because the electronics that is in high energy rank excitation state is unstable, the ground state that can get back to the low energy rank in the mode of alleviating (relaxation) again.In the alleviation process, if when mode releases energy,, make the form consumption of energy with " heat " with producing the vibration of lattice with non-radiative (non-radiative).If when mode discharges, then emit energy with the form of light with electromagnetic radiation (radiative).If the optical wavelength of sending drops on visible-range, then human eye can be seen the light that fluorophor radiates.At this fluorophor issued light, only relevant with electronics transition between high low energy rank.
(host lattice H) is main constituent, for example ZnS:Cu to the employed fluorescent material of light-emitting diode by host lattice
2+, wherein ZnS is host lattice.Luminescence center constitutes in host lattice by a small amount of interpolation or doping (dope) xenogenesis ion in the fluorophor, for example ZnS:Cu
2+In Cu
2+The xenogenesis ion is also referred to as active centre (activator) or activator for being excited and producing the centerbody of fluorescence thus.Sometimes also can in host lattice, add second kind of xenogenesis ion in the fluorescent material, act as the excitation energy that it is absorbed and be passed to active centre ion and luminous, be called sensitizer (sensitizer) or coactivator (co-activator).So can design the fluorescent material that tool of all kinds is launched various wavelength by controlling host lattice and active centre.At present, the material of main part of the fluorescent material that can see on the market is many is made of sulfide (Sulfides), oxide (Oxides), oxysulfide (Oxysulfides), nitride (Nitrides), nitrogen oxide (Oxynitrides), garnet (Garnet) and silicate (Silicates) class etc.
The white light of common people's indication is meant the sunlight of seeing daytime, goes up the analysis back through scientific principle and finds that its white light comprises the continuous spectrum of 400nm～700nm scope.With visual color, can resolve into seven looks such as red, orange, yellow, green, blue, indigo, purple.According to the principle of luminosity of light-emitting diode, generally can only send monochromatic light.In order to allow it can send white light, technically must mix the light of two or more complementary colours and reach the purpose of white light.White light emitting diode is except producing white light, and the ability that whether can represent the informativeness of object color promptly is called the part that color rendering (Color Rendering) also is technical necessary consideration.The light source that color rendering is high is comparatively true to nature for the performance of object color, and illuminated thing is at the also relatively more approaching natural primary colors of the mankind's the object color that eyes presented.White light emitting diode drill colour system number (Color Rendering Index; CRI) relevant with light-emitting diode chip for backlight unit, fluorescent material and material.Under different-colour, the fluorescent material of use or light-emitting diode chip for backlight unit can be different.
The definition of colour temperature (Color Temperature) is according to black matrix (Black body) radiation, when being heated to uniform temperature, can present coloured visible light to metal (near black matrix).This light changes along with the rising of temperature, and the temperature that influences this light source just is the colour temperature of this light source.For example when an iron was heated up, iron can become aglow at first, can become orange afterwards, was yellow afterwards, was blue and white afterwards again.The researcher utilizes a row continuous spectrum to verify relation between its temperature and the color.If the x axle is a wavelength, the y axle is just represented radiant flux, when the y axle is the amount of reflection different wave length radiation, and the curve of energy that iron the is emitted during different temperatures of can drawing.So, when iron becomes redness, do not represent that it only glows, just the ruddiness of its radiation is more than the ripple of other wavelength.Three speciality are found in test thus: 1. curve has a high peak dot; 2. when increase in temperature, high peak dot can move to the shortwave direction; 3. when increase in temperature, the radiant flux of all wavelengths all can increase.For example iron is maximum at 4200K granting ruddiness, and the high peak dot of radiant flux takes on a red color so we see iron at the ruddiness place, and when 4800K, the high peak dot of radiant flux is orange-yellow.Being orange-yellow so we see iron, is because when increase in temperature, high peak dot can move to the shortwave direction, so when 5800K, high peak dot can move on to yellow green.
In the calculating of colour temperature, be with absolute temperature Kelvin (Kelvin; K) be unit, black-body radiation with Kelvin=Celsius+273 as the starting points of calculating.Suppose a certain black object, can be with all heat absorption that fall thereon, and not loss can all discharge the energy that heat generates again simultaneously with the form of " light ", it just can become different colors because of the height that is subjected to heating power.For example, when the heating power that is subjected to when black matrix is equivalent to 500-550 ℃, will become kermesinus, when reaching 1050-1150 ℃, with regard to yellowing.Thereby the color component of light source is corresponding with the suffered heating power temperature of this black matrix.Therefore, the color component of light source is corresponding with the suffered heating power temperature of this black matrix.Only colour temperature is to represent with Kelvin (K) colour temperature unit, rather than uses centigrade thermic unit unit.It just became white when the heating power that is subjected to when black matrix made it can emit whole visible light wave in the spectrum, and the tungsten filament in our the used bulb is just quite near this black matrix.The colour temperature meter algorithm is exactly according to above-mentioned principle, with the K look K temperature unit of light that tungsten filament is radiated represent the to be heated colour temperature of light that tungsten filament is radiated of representing to be heated.According to this principle, the colour temperature of any light is suffered " temperature " when being equivalent to above-mentioned black matrix and giving out same color.This temperature can find its corresponding points on the Planckian locus of chromatic diagram, the curve of black matrix only can be subjected to temperature and change, and can not be subjected to the composition of other factors such as black matrix and changes, so no matter be the black matrix of any composition, so long as same temperature all can have same curve.
Owing to condition influence such as lamp, look, time, weather, direction of observation, season and geographical position alter a great deal, evaluation to color is extremely inconvenient, so Commission Internationale De L'Eclairage's (CommissionInternational de l ' Eclairage is called for short CIE).Stipulate various very near the standard sources of natural daylight in nineteen thirty.
What is called is on average drilled the colour system number, and (general color rendering index Ra) is the relative different of object in the color that shows under certain light source irradiation and its color under the reference light source irradiation.The rating method of its numerical value is made comparisons one by one on 8 standard color samples of DIN 6169 defineds or the Standard colour board and is quantized its otherness for impinging upon with reference light source and light source to be measured respectively, and regulation then is 14 standard color samples or Standard colour board in the world.Otherness is big more, promptly represents color rendering to be measured poor more, and the color that is presented is got over distortion.The CIE of Commission Internationale De L'Eclairage is decided to be 100 to the colour system number of drilling of the sun, and the color rendering index of various types of light sources has nothing in common with each other.For example, the colour system of on average drilling of high-pressure sodium lamp is counted Ra=23, and the colour system of on average drilling of fluorescent tube is counted Ra=60～90.
In addition, Commission Internationale De L'Eclairage has formulated one and has been called the standard of " 1931 CIE standard observer " according to the Mathematical Modeling of vision and color matching experimental result, be actually a cover color matching functions with three curve representations, therefore be also referred to as " CIE 1931 matches criteria functions " in many documents, as shown in Figure 1.CIE 1931 chromatic diagrams are XYZ chromaticity diagram of representing with nominal value, and x represents red component, and y represents green component.Be all colours of visible spectrum in the horseshoe type scope in chromatic diagram (chromaticity diagram), the horseshoe type edge then is saturated monochromatic wavelength.(x, y z) indicate and can be combined into certain relative scale of the same colour (x and y coordinate are only arranged on the figure, can derive z by identity x+y+z=1) by three primary colors with photochromic coordinate in this system.Middle white light, its coordinate is (0.33,0.33).The color that is looped around the color space edge is a spectrum colour, and the maximum saturation of spectrum colour is represented on the border, and the wavelength of borderline numeral spectrum colour, its profile comprise all perception tones.All monochromatic light all are positioned on the ligulate curve, and this curve is exactly monochromatic track, and the numeral of the other mark of curve is monochromatic (or claiming spectrum colour) light wavelength value.The various actual colors of occurring in nature all are positioned at this closed curve.
In Fig. 2, show the distribution schematic diagram of colour temperature in the colourity diagram that black body radiation is different.Its notion of Planck curve in chromatic diagram is to be changed by black body radiation.Its equation derivation was since 1859, and roentgen kirchhoff (Kirchhoff) has proposed radiation law (law ofradiation), pointed out under the temperature of determining, object is relevant with the character on surface to the emissivity or the absorptivity of radiant energy.And atrament has bigger absorbability to radiant energy.If an object can both absorb the radiant energy of any frequency fully under any temperature, just this object is called black matrix (blackbody) so.Certainly, in fact also can not obtain a perfect blackbody.But experimentally, we can be similar to a perfect blackbody with a cavity of having opened an aperture.After extraneous radiant energy was injected cavity via aperture, this radiation did not almost have chance again by the aperture outgoing through repeatedly reflection, was absorbed fully by cavity institute so can be considered radiant energy.If this cavity of heating is observed the outgoing spectrum by aperture to a certain temperature, this spectrum should be identical with the absorption spectrum at the black matrix of same temperature.
By Si Difen (J.Stefan) gross energy (E) of black body radiation was proposed in 1879 and the biquadratic of absolute temperature (T) is directly proportional E=aT
4, promptly so-called Si Difen-Boltzmann law (Stefan-Boltzmannlaw).
1893 Wien (Wien) further calculate the radiant energy wavelength change, the variation of finding wavelength X is directly proportional with temperature, if draw Si Difen-Boltzmann law (Stefan-Boltzmann law) again, and adiabatic process formula in the thermodynamics, can get Wien's displacement law (Wien displacement law), T λ
Max=constant.
1896 Wien (Wien) consider and analyze experimental data to draw a semiempirical formula and be from the thermodynamics universal theory
ρ
v＝αv
3?exp(βv/T)
ρ wherein
vBe radiant energy dfensity (radiant energy density) that v is a frequency, T is an absolute temperature, and α and β are constants.
1900, Rayleigh (J.W.Rayleigh), Jones (J.H.Jeans) derives a black body radiation formula according to classic electrodynamics and Statistical Physics theory, i.e. Rayleigh-Jones's law (Rayleigh-Jeans law):
Wherein c is the light velocity, k=Boltzmann constant (Boltzmann ' s constant).But this formula only meets in low frequency part and empirical curve, and when v → ∞, ρ
v→ ∞ disperses, and obviously is not inconsistent " the ultraviolet disaster " in the promptly classic physics with experiment.
Meticulousr afterwards and comprehensive experiment shows that Wien (Wien) formula is not all to meet fine with all experimental datas.At L-band, Wien (Wien) formula and experiment have significantly and depart from.Roentgen Planck (M.Planck) will find a formula that can coincide with experimental data in the end of the year 1900, promptly
Or
Wherein h is a Planck's constant, and size is h=6.626 * 10-34Js.By the hypothesis of the Planck Rayleigh-Jones's law (Rayleigh-Jeans law) of can successfully explaining and derive, Wien's displacement law (Wiendisplacement law), Si Difen-Boltzmann law (Stefan-Boltzmann law).
Because different colour temperature, the color rendering of factors influence such as light-emitting diode chip for backlight unit and fluorescent material white-light emitting spectrum, in process of the test, often need repeatedly each influencing factor of cross-beta, obtain the real cost plenty of time and the cost of needing of white light emitting diode of a high color rendering.The aforesaid problem of the artificial solution of invention, reach the white light emitting diode of high color rendering in the high efficiency mode, according to the principle of above-mentioned black body radiation and further create and invent a kind of can mixing fast by its Planck equation formula of deriving (Planck ' s law) and use multiple fluorescent material to be mixed into the compound method and the system of the white light emitting diode of high color rendering.
The invention is characterized in the two stage approximate allotment ratio of various fluorescent material of finding out of using at high color rendering light emitting diode.The approximate of phase I mainly is the mixed proportion that mixes near the various fluorescent material of black body radiation, and second stage approximate mainly is the allotment ratio from the poorest each fluorescent material of colour table correction of color rendering.
See also Fig. 3, show that a kind of multi-fluorescence powder concentration of calculating of the present invention is to obtain the method for high color rendering light emitting diode.First step 31, the concentration of at first adjusting the multi-fluorescence powder make with a light-emitting diode mixed light after frequency spectrum near the luminous frequency spectrum of black body radiation under one first colour temperature.Above-mentioned light-emitting diode can be a ultraviolet light-emitting diodes, purple-light LED, or blue light-emitting diode.The multi-fluorescence powder can have two kinds or two or more fluorescent material, is made decision by the coloured light of light-emitting diode.For example, when using ultraviolet light or purple-light LED, need to use simultaneously the fluorescent material of three looks just can blend together white light at least.When using blue light-emitting diode, need select the fluorescent material of two kinds of colors just can blend together the white light of high color rendering at least.Afterwards, second step 32 is found out the frequency spectrum the poorest colour table of color rendering in the reflecting spectrum of each Standard colour board behind the aforementioned mixed light, revises the concentration of multi-fluorescence powder whereby.Frequency spectrum behind the general mixed light, in the reflecting spectrum that shines 14 kinds of Standard colour boards, the reflecting spectrum that has at least one colour table is relatively low.Utilize the information of this colour table, can be from the concentration of new each fluorescent material of adjustment to improve the reflecting spectrum of the poorest colour table of color rendering.
In the flow process with reference to figure 3, the present invention also provides a kind of method that disposes high color rendering light emitting diode, and detailed process sees also Fig. 4.At first, first step 41 calculates a standard frequency spectrum, and wherein standard frequency spectrum is the visible light transmitted by black-body radiation frequency spectrum under one first colour temperature.Simultaneously, in second step 42, provide the emission spectrum of a light-emitting diode, the emission spectrum of one first fluorescent material, and the emission spectrum of one second fluorescent material.Afterwards, in third step 43, adjust the concentration of first fluorescent material and second fluorescent material and obtain one first mixed light frequency spectrum, make win mixed light frequency spectrum and standard frequency spectrum approaching by above-mentioned standard frequency spectrum.Then, see also the 4th step 44, calculate the color rendering of the first mixed light frequency spectrum at each Standard colour board.Then, in the 5th step 45, find out the poorest colour table of color rendering so as to revising the concentration of first fluorescent material and second fluorescent material, thereby obtain one second mixed light frequency spectrum.Frequency spectrum behind the general mixed light, in the reflecting spectrum that shines 14 kinds of Standard colour boards, the reflecting spectrum that has at least one colour table is relatively low.Utilize the information of this colour table, can be from the concentration of new each fluorescent material of adjustment to improve the reflecting spectrum of the poorest colour table of color rendering.In Fig. 4, have only with two kinds of fluorescent material and represent embodiments of the invention.Yet, can use the 3rd fluorescent material simultaneously, the 4th fluorescent material, or even the 5th fluorescent material.
According to the flow process of Fig. 4, the present invention also provides a kind of system that disposes high color rendering light emitting diode, describes in detail to see also Fig. 5.One first database 51 is in order to store the emission spectrum of a light-emitting diode, one first fluorescent material emission spectrum, and one second fluorescent material emission spectrum.One colour mixture unit 52, in order to the light-emitting diode of calculating in first database 51, first fluorescent material, and the mixed light frequency spectrum of second fluorescent material, wherein the mixed light frequency spectrum is one first mixed light frequency spectrum.One standard color temperature frequency spectrum generator 53 is in order to be created in the visible light transmitted by black-body radiation frequency spectrum under one first colour temperature.One frequency spectrum comparing unit 54 is in order to compare the standard frequency spectrum that the first mixed light frequency spectrum and standard color temperature frequency spectrum generator 53 are produced.When the judgement of frequency spectrum comparing unit 54 be the first mixed light frequency spectrum near the visible light transmitted by black-body radiation frequency spectrum under first colour temperature, then down a stage transmits with the data of the first mixed light frequency spectrum.If comparison result is kept off, then can recalculate the first colour mixture frequency spectrum, till comparison result is approaching by colour mixture unit 52.
Please continue with reference to Fig. 5, one second database 55 is in order to store the reflecting spectrum of each Standard colour board.The reflecting spectrum generation unit 56 of one Standard colour board, in order to reading the reflecting spectrum of each Standard colour board in second database 55, and the first mixed light frequency spectrum and standard frequency spectrum are produced each Standard colour board reflecting spectrum of the first mixed light frequency spectrum and each Standard colour board reflecting spectrum of standard frequency spectrum respectively.One colour table Frequency spectrum ratio is than unit 57, in order to each Standard colour board reflecting spectrum of comparing the first mixed light frequency spectrum and each Standard colour board reflecting spectrum of standard frequency spectrum.Approaching for the color rendering of all Standard colour boards is when the comparison result of colour table frequency spectrum comparing unit 57, and mark is the nominal value of setting, and for example 95 or 97, represent that the first mixed light frequency spectrum is the white light of high color rendering.In the comparison result of colour table frequency spectrum comparing unit 57, it is low than mean value that the color rendering of some or two colour tables is arranged, or be lower than the nominal value of setting, then get back to colour mixture unit 52 and recalculate the first colour mixture frequency spectrum, up to can be by till the comparison result of colour table frequency spectrum comparing unit 57.
Following each relevant indicators will be in order to describe each preferred embodiment of the present invention in detail.Fig. 6 is the compound method flow chart of high color rendering white light emitting diode.First step 61 calculates the visible light spectrum of black body radiation under a certain specific colour temperature.In the present embodiment, be with the Planck equation formula
Calculate the visible light spectrum of the black body radiation of target colour temperature.Yet, from its development of above-mentioned black body radiation, also can use Rayleigh Jones (Rayleigh-Jeans) equation, Si Difen-Boltzmann (Stefan-Boltzmann) equation, or Wien (Wien) equation is as the frequency spectrum of the black body radiation of simplifying.Set a target colour temperature and with Planck equation formula (Planck ' s Law), (reference color temperature can be from 2500K～8000K), be the visible light spectrum of the black body radiation of target colour temperature to calculate the frequency spectrum of colour temperature.In this step, the visible light spectrum of the black body radiation of target colour temperature is by T
a(λ) expression.
Second step 62 promptly provides emission spectrum, the first fluorescent material emission spectrum, and the second fluorescent material emission spectrum of known luminescence diode chip for backlight unit.As two or more fluorescent material, just need provide the emission spectrum of all fluorescent material.In this step, the emission spectrum of light-emitting diode chip for backlight unit measurement is to be represented by L (λ); The emission spectrum that first fluorescent material measures is to be represented by P1 (λ); And the emission spectrum of the second fluorescent material measurement is to be represented by P2 (λ).
Third step 63 is according to the visible light spectrum of first step calculate black body radiation under a certain specific colour temperature, mix the concentration of all fluorescent material, calculate light-emitting diode chip for backlight unit, the first fluorescent material concentration and the mixed mixing emission spectrum of the second fluorescent material concentration then.A kind of account form is as described in the equation (2):
C
a(λ)＝a×L(λ+Δλ)+b×P1(λ+Δλ)+c×P2(λ+Δλ)
Ask
To visible light spectrum be minimizing (a, b, c)
(2)
Wherein, mix emission spectrum by C
a(λ) expression;
The luminous intensity of light-emitting diode chip for backlight unit is represented by a;
The concentration of first fluorescent material is represented by b; And
The concentration of second fluorescent material is represented by c.
Above-mentioned mode is wherein a kind of account form, yet any people who knows this technology ought to use other equation to calculate the concentration of each fluorescent material.The mixed light frequency spectrum C that calculates according to aforesaid way
a(λ) be the first mixed light frequency spectrum.
The 4th step 64 calculate the first mixed light frequency spectrum the reflectance spectrum of each Standard colour board with drill the colour system number.Mainly be the comparison object colour temperature black body radiation visible light spectrum and first frequency spectrum or mix the otherness of the reflecting spectrum of its 14 Standard colour boards of emission spectrum.Manner of comparison such as following equation:
At first, the reflecting spectrum of 14 colour tables of the visible light spectrum of calculating target colour temperature:
Reflecting spectrum=the T of its 14 colour tables of Ta (λ)
a(N
0) colorcheck (λ) (3)
N wherein
0The numbering of representing each colour table, and colorcheck (λ) represents the reflecting spectrum of each colour table.
Simultaneously, calculate mixing frequency spectrum C
a(λ) or the reflecting spectrum of 14 colour tables of the first mixed light frequency spectrum:
Reflecting spectrum=the C of its 14 colour tables of Ca (λ)
a(N
0) colorcheck (λ) (4)
Carry out the comparison of 14 indivedual reflecting spectrum of Standard colour board by equation (3) and (4).In this step, can use similar equation (2) to do the calculating of each colour table:
The 5th step 65 is found out and is drilled colour system numerical value (numerical value of difference maximum among the R1～R14) is got back to second step 62 and revised the concentration of its first fluorescent material or the concentration of its second fluorescent material, revises promptly also that (b c), or can reselect fluorescent material.Make to obtain one second mixed light frequency spectrum in this way, make the R value of difference maximum promote.In this step 65, be the colour table numbering of finding out the difference maximum at the result of 14 colour tables in the equation (5).At the numbering of this colour table, the concentration of the fluorescent material that expression was selected originally need adjust, or even needs to change different types of fluorescent material.Utilize such loop to calculate, up to calculating maximum difference value in acceptable scope in equation (5), or the variation of difference value is in acceptable scope.
The flow chart of collocation Fig. 6, the present invention provides a kind of block diagram of preparation of high color rendering white light emitting diode simultaneously.See also Fig. 7, the black body radiation generator 71 of a target colour temperature can provide the visible light spectrum of the black body radiation of a certain specific colour temperature, and wherein the scope of colour temperature can be between 1500K～8000K.One first database 72 is used for storing the emission spectrum of various light-emitting diode chip for backlight unit and fluorescent material.Long wave ultraviolet light light-emitting diode chip for backlight unit transmitting boundary is that 365nm～380nm, purple-light LED chip transmitting boundary are that 380nm～420nm and blue LED chip transmitting boundary are 420nm～470nm.The emission wavelength scope of fluorescent material can be between 480-580nm, and composition can be silicates, or the oxide family, for example:
CaSc
2O
4:Ce(516nm)；
(MgCaSrBa)
2SiO
4:Eu(525nm)；
Ca
3Sc
2Si
3O
12:Ce(455-507nm)；
(Ca
1.47Mg
1.5Ce
0.03)(Sc
1.5Y
0.5)Si
3O
12(455nm)；
(Ca
2.97Ce
0.03)Sc
2(Si，Ge)
3O
12。
And the emission wavelength scope of fluorescent material is mainly nitride family and sulfide family between 600-650nm, for example:
CaAlSiN
3:Eu(650nm)；
(CaEu)AlSiN
3(648nm)；
(SrCa)AlSiN
3:Eu(630nm)；
SrGa
2S
4:Eu(645nm)。
Any people who is familiar with the technology of the present invention field ought to understand the fluorescent material that other kinds can be arranged and can be applied among the present invention, garnet family for example, nitrogen oxide etc.
The light-emitting diode chip for backlight unit that frequency spectrum computing unit 73 obtains from first database 72 and the emission spectrum of two kinds of different fluorescent material, and judge fluorescent material concentration earlier.Get a mixed light frequency spectrum via frequency spectrum computing unit 73.See also Fig. 8, be the mixed light frequency spectrum of light-emitting diode chip for backlight unit with the mixing of two kinds of different fluorescent material.In Fig. 8, curve A is the emission spectrum of light-emitting diode chip for backlight unit, and curve B and curve C are the emission spectrum of fluorescent material, and curve D is mixed mixing emission spectrum.
The visible light spectrum of the black body radiation of frequency spectrum comparing unit 74 comparison object colour temperatures and the frequency spectrum similarity of mixed light frequency spectrum.See also Fig. 9, for the visible light spectrum of the black body radiation of target colour temperature with shown in the comparison diagram that mixes frequency spectrum.In Fig. 9, curve E is the visible light spectrum of the black body radiation of target colour temperature, and curve F is for mixing emission spectrum.Utilize two frequency spectrum overlapping modes to judge the similarity of frequency spectrum, with the degree of approximation of the visible light spectrum of the black body radiation that improves white light mixed light frequency spectrum and target colour temperature.Reach Frequency spectrum ratio to similar Yes as the mixed light frequency spectrum, then obtain a suitable white light emission frequency spectrum; As mix emission spectrum and do not reach Frequency spectrum ratio similar No, then need adjust the concentration 76 of fluorescent material or reselect fluorescent material 77, up to the visible light spectrum of the black body radiation of target colour temperature and the Frequency spectrum ratio of mixing emission spectrum to reach similar till.
The present invention provides a kind of block diagram of preparation of high color rendering white light emitting diode simultaneously, sees also Figure 10.The black body radiation generator 100 of one target colour temperature can provide the visible light spectrum of the black body radiation of a certain specific colour temperature, and wherein the scope of colour temperature can be between 1500K～8000K.One first database 101 is used for storing the emission spectrum of various light-emitting diode chip for backlight unit and fluorescent material.Long wave ultraviolet light light-emitting diode chip for backlight unit transmitting boundary is that 365nm～380nm, purple-light LED chip transmitting boundary are that 380nm～420nm and blue LED chip transmitting boundary are 420nm～470nm.The emission wavelength scope of fluorescent material can be between 480-580nm, and composition can be silicates, or the oxide family, for example:
CaSc
2O
4:Ce(516nm)；
(MgCaSrBa)
2SiO
4:Eu(525nm)；
Ca
3Sc
2Si
3O
12:Ce(455-507nm)；
(Ca
1.47Mg
1.5Ce
0.03)(Sc
1.5Y
0.5)Si
3O
12(455nm)；
(Ca
2.97Ce
0.03)Sc
2(Si，Ge)
3O
12。
And the emission wavelength scope of fluorescent material is mainly nitride family and sulfide family between 600-650nm, for example:
CaAlSiN
3:Eu(650nm)；
(CaEu)AlSiN
3(648nm)；
(SrCa)AlSiN
3:Eu(630nm)；
SrGa
2S
4:Eu(645nm)。
Any those of ordinary skill of being familiar with the technology of the present invention field ought to be understood the fluorescent material that other kinds can be arranged and can be applied among the present invention, garnet family for example, nitrogen oxide etc.
The light-emitting diode chip for backlight unit that frequency spectrum computing unit 102 obtains from first database 111 and the emission spectrum of two kinds of different fluorescent material, and, judge fluorescent material concentration by the visible light spectrum that relatively rises the black body radiation of target colour temperature from black body radiation generator 100 products of target colour temperature.Get a mixed light frequency spectrum via frequency spectrum computing unit 102.
Second database 103 stores the data of the reflecting spectrum of various Standard colour boards.The reflecting spectrum of Standard colour board with drill colour system count computing unit 104 be visible light spectrum from second database 103 and the black body radiation of the target colour temperature black body radiation that can calculate the target colour temperature visible light spectrum 14 colour tables reflecting spectrum and drill colour system numerical value (R1～R14).
The reflecting spectrum of mixed light frequency spectrum with drill colour system count computing unit 105 from the mixed light frequency spectrum that second database 103 and frequency spectrum computing unit 102 are calculated, can calculate the mixed light frequency spectrum 14 colour tables reflecting spectrum and drill colour system numerical value (R1～R14).
Comparing unit 107, by the reflecting spectrum of above-mentioned Standard colour board with drill reflecting spectrum that colour system counts computing unit 104 and mixed light frequency spectrum and drill colour system and count the reflecting spectrum of indivedual relatively 14 colour tables of computing unit 105 result of calculations and drill colour system numerical value (R1～R14).(R1～R14) and on average drill colour system numerical value Ra wherein finds out R value the poorest among R1～R14 at the colour system numerical value of drilling of 14 colour tables to obtain aforementioned two frequency spectrums via comparing unit.(R1～R14) and on average drill colour system numerical value (Ra) and all reach the target factor value then obtains a suitable white light emission frequency spectrum as the colour system numerical value of distinctly drilling of 14 colour tables.Drill colour system numerical value (R1～R14) and on average drill colour system numerical value (Ra) individually as 14 colour tables wherein one to several numerical value miss the mark coefficient values No, then need adjust the concentration 108 of fluorescent material or reselect fluorescent material 109, till reaching the target factor value.
Figure 11 shows the system block diagram of configuration high color rendering white light emitting diode of the present invention.The frequency spectrum generator 110 of the black body radiation of one target colour temperature can provide the visible light spectrum of the black body radiation of a certain specific colour temperature, and wherein the scope of colour temperature can be between 1500K～8000K.
CaSc
2O
4:Ce(516nm)；
(MgCaSrBa)
2SiO
4:Eu(525nm)；
Ca
3Sc
2Si
3O
12:Ce(455-507nm)；
(Ca
1.47Mg
1.5Ce
0.03)(Sc
1.5Y
0.5)Si
3O
12(455nm)；
(Ca
2.97Ce
0.03)Sc
2(Si，Ge)
3O
12。
And the emission wavelength scope of fluorescent material is mainly nitride family and sulfide family between 600-650nm, for example:
CaAlSiN
3:Eu(650nm)；
(CaEu)AlSiN
3(648nm)；
(SrCa)AlSiN
3:Eu(630nm)；
SrGa
2S
4:Eu(645nm)。
Any those of ordinary skill of being familiar with the technology of the present invention field ought to be understood the fluorescent material that other kinds can be arranged and can be applied among the present invention, garnet family for example, nitrogen oxide etc.
Frequency spectrum computing unit 112 is the light-emitting diode chip for backlight unit that obtains from first database 111 and the emission spectrum of two kinds of different fluorescent material, and judges fluorescent material concentration earlier.Get a mixed light frequency spectrum via frequency spectrum computing unit 112.
The visible light spectrum of the black body radiation of frequency spectrum comparing unit 113 comparison object colour temperatures and the frequency spectrum similarity of mixed light frequency spectrum.Comparative result is first rank approximate 114.As the approximate result in first rank Yes that is fine, then down a stage carries out.The result approximate when first rank is not all right No, then gets back to frequency spectrum computing unit 112, finds out the concentration of other fluorescent material again, till the result on first rank approximate 114 is fine Yes.
The reflecting spectrum color rendering computing unit 118 of mixed light frequency spectrum calculate from mixed light frequency spectrum and second database 115 the mixed light frequency spectrums 14 colour tables reflecting spectrum and drill colour system numerical value (R1～R14).
Comparing unit 129, the result that the reflecting spectrum color rendering computing unit 116 of standard of comparison colour table and the reflecting spectrum color rendering computing unit 118 of mixed light frequency spectrum are produced.(R1～R14) and on average drill colour system numerical value Ra, its comparative result is second rank approximate 119 at the colour system numerical value of drilling of 14 colour tables to obtain aforementioned two frequency spectrums via comparing unit 117.(R1～R14) and on average drill colour system numerical value (Ra) and all reach target factor value Yes then obtains a high-order approximation when the colour system numerical value of distinctly drilling of 14 colour tables.(R1～R14) and on average drill colour system numerical value (Ra) one or several numerical value miss the mark coefficient values No wherein then need get back to frequency spectrum computing unit 112 and adjust the concentration of fluorescent material or reselect fluorescent material as the colour system numerical value of drilling individually of 14 colour tables.
The present invention is except that can be two kinds of fluorescent material of the described mixing of the foregoing description, and the fluorescent material quantity of aforementioned mixing also can increase to three kinds, so can make required that the present invention more can realistic application.Certainly the execution mode that does not limit to above-mentioned two or three fluorescent material during practice can use fluorescent material more than three kinds to reach user's demand in case of necessity.
From the above embodiments, can find out means of the present invention, use Planck (Planck) equation to calculate the frequency spectrum of the black body radiation of design temperature, calculate first approximate concentration of multiple fluorescent material with this spectrometer.According to the luminous frequency spectrum that calculates after the allotment of first approximate concentration of each fluorescent material after the light-emitting diode colour mixture, and luminous according to this frequency spectrum calculates the color rendering in Standard colour board.From the concentration of the poorest each fluorescent material of colour table correction of color rendering to obtain the light-emitting diode of best color rendering.
Utilize means of the present invention, can reach the effect that can mix the light-emitting diode of high color rendering fast, and can significantly reduce the time cost of trial and error.
From means of the present invention and the effect that has, can obtain the present invention and have many advantages.At first, need can not find out the allotment ratio of fluorescent material via the mode of trial and error.Simultaneously, when the fluorescent material of multiple class can supply allotment, can significantly reduce the research and development time.
Apparently, according to the description among the top embodiment, the present invention has many modifications and difference.Therefore need be understood in the scope of its additional claim, except above-mentioned detailed description, the present invention can also implement in other embodiment widely.Above-mentioned is the preferred embodiments of the present invention only, is not in order to limit claim of the present invention; All other do not break away from the equivalence of being finished under the disclosed spirit and change or modification, all should be included in described claims.
Claims (10)
1. the collocation method of a high color rendering light emitting diode comprises:
Calculate a standard frequency spectrum, this standard frequency spectrum is the visible light transmitted by black-body radiation frequency spectrum under one first colour temperature;
Provide the emission spectrum of a light-emitting diode, the emission spectrum of one first fluorescent material, and the emission spectrum of one second fluorescent material; And
Adjust the concentration of this first fluorescent material and this second fluorescent material and obtain one first mixed light frequency spectrum by this standard frequency spectrum, make that this first mixed light frequency spectrum and this standard frequency spectrum are approaching.
2. the collocation method of a high color rendering light emitting diode comprises:
Calculate a standard frequency spectrum, this standard frequency spectrum is the visible light transmitted by black-body radiation frequency spectrum under one first colour temperature;
Provide the emission spectrum of a light-emitting diode, the emission spectrum of one first fluorescent material, and the emission spectrum of one second fluorescent material;
Adjust the concentration of this first fluorescent material and this second fluorescent material and obtain one first mixed light frequency spectrum by this standard frequency spectrum;
Calculate the color rendering of this first mixed light frequency spectrum at each Standard colour board; And
Find out the concentration of this first fluorescent material of the poorest colour table correction of color rendering and this second fluorescent material, thereby obtain one second mixed light frequency spectrum.
3. as the collocation method of claim 1 or the described high color rendering light emitting diode of claim 2, the step of wherein above-mentioned this standard frequency spectrum of calculating is to utilize the Planck equation formula to calculate and get.
4. as the collocation method of claim 1 or the described high color rendering light emitting diode of claim 2, the first wherein above-mentioned fluorescent material can be CaSc
2O
4: Ce, (MgCaSrBa)
2SiO
4: Eu, Ca
3Sc
2Si
3O
12: Ce, (Ca
1.47Mg
1.5Ce
0.03) (Sc
1.5Y
0.5) Si
3O
12, (Ca
2.97Ce
0.03) Sc
2(Si, Ge)
3O
12, CaAlSiN
3: Eu, (CaEu) AlSiN
3, (SrCa) AlSiN
3: Eu or SrGa
2S
4: Eu.
5. the configuration-system of a high color rendering light emitting diode comprises:
In order to calculate the means of a standard frequency spectrum, this standard frequency spectrum is the visible light transmitted by black-body radiation frequency spectrum under one first colour temperature;
In order to provide the emission spectrum of a light-emitting diode, the emission spectrum of one first fluorescent material, and the means of the emission spectrum of one second fluorescent material;
Obtain the means of one first mixed light frequency spectrum in order to the concentration of adjusting this first fluorescent material and this second fluorescent material by this standard frequency spectrum;
In order to calculate the means of this first mixed light frequency spectrum at the color rendering of each Standard colour board; And
Find out the means of the poorest colour table of color rendering, thereby obtain the means of one second mixed light frequency spectrum in order to the concentration of revising this first fluorescent material and this second fluorescent material.
6. the configuration-system of a high color rendering light emitting diode comprises:
One first database is in order to store the emission spectrum of a light-emitting diode, one first fluorescent material emission spectrum, and one second fluorescent material emission spectrum;
One second database is in order to store the reflecting spectrum of each Standard colour board;
One colour mixture unit, in order to calculating this light-emitting diode in this first database, this first fluorescent material, and the mixed light frequency spectrum of this second fluorescent material, wherein this mixed light frequency spectrum is one first mixed light frequency spectrum;
One standard color temperature frequency spectrum generator is in order to be created in the visible light transmitted by black-body radiation frequency spectrum under one first colour temperature;
One frequency spectrum comparing unit is in order to compare the standard frequency spectrum that this first mixed light frequency spectrum and this standard color temperature frequency spectrum generator are produced;
The reflecting spectrum generation unit of one Standard colour board, in order to reading the reflecting spectrum of each Standard colour board in this second database, and this first mixed light frequency spectrum and this standard frequency spectrum are produced each Standard colour board reflecting spectrum of this first mixed light frequency spectrum and each Standard colour board reflecting spectrum of this standard frequency spectrum respectively; And
One colour table Frequency spectrum ratio is than the unit, in order to each Standard colour board reflecting spectrum of comparing this first mixed light frequency spectrum and each Standard colour board reflecting spectrum of this standard frequency spectrum.
7. as the configuration-system of claim 5 or the described high color rendering light emitting diode of claim 6, the means of wherein above-mentioned this standard frequency spectrum of calculating or standard color temperature frequency spectrum generator are to utilize the Planck equation to calculate and get.
8. as the configuration-system of claim 5 or the described high color rendering light emitting diode of claim 6, the first wherein above-mentioned fluorescent material can be CaSc
2O
4: Ce, (MgCaSrBa)
2SiO
4: Eu, Ca
3Sc
2Si
3O
12: Ce, (Ca
1.47Mg
1.5Ce
0.03) (Sc
1.5Y
0.5) Si
3O
12, (Ca
2.97Ce
0.03) Sc
2(Si, Ge)
3O
12, CaAlSiN
3: Eu, (SrCa) AlSiN
3: Eu or SrGa
2S
4: Eu.
9. one kind is calculated multi-fluorescence powder concentration to obtain the collocation method of high color rendering light emitting diode, comprises:
Adjust the concentration of multi-fluorescence powder, make with a light-emitting diode mixed light after frequency spectrum near the luminous frequency spectrum of black body radiation under one first colour temperature; And
Find out the frequency spectrum the poorest colour table of color rendering in the reflecting spectrum of each Standard colour board behind this mixed light, so as to revising the concentration of this multi-fluorescence powder.
10. one kind is used two stage being similar to find out the method for various fluorescent material in the allotment ratio of high color rendering light emitting diode, comprises:
Mix mixed proportion near the various fluorescent material of black body radiation; And
Allotment ratio from the poorest these the various fluorescent material of colour table correction of color rendering.
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