CN112310263B - Full-spectrum LED light source - Google Patents
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- CN112310263B CN112310263B CN201910713540.7A CN201910713540A CN112310263B CN 112310263 B CN112310263 B CN 112310263B CN 201910713540 A CN201910713540 A CN 201910713540A CN 112310263 B CN112310263 B CN 112310263B
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- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
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Abstract
The invention provides a full-spectrum LED light source, which comprises an excitation light source with the emission wavelength of 350-; the fluorescent layer comprises a fluorescent powder group and a transparent material, wherein the fluorescent powder group comprises blue-green fluorescent powder with the emission wavelength of 480-520nm and yellow-green fluorescent powder with the emission wavelength of 500-590 nm; red fluorescent powder with the emission wavelength of 600-700 nm; the fluorescent powder group in the full-spectrum LED light source also comprises blue fluorescent powder with the emission wavelength of 430-500 nm. The full-spectrum LED light source provided by the invention has excellent aging performance, high brightness and high color rendering index.
Description
Technical Field
The invention belongs to the technical field of illumination, and particularly relates to a full-spectrum LED light source.
Background
Light Emitting Diodes (LEDs) have the advantages of high efficiency, energy saving, environmental protection, long life, small volume, easy maintenance, etc., and have become the mainstream of illumination Light sources, and have a wide application field. With the continuous expansion of the application field of the LED, higher requirements are put forward on the light emitting characteristics of the LED. Among them, the expansion of the light emitting spectrum range of LED is one of the main improvement directions, and such products are named full spectrum LED in the industry.
The full spectrum refers to a spectrum curve containing ultraviolet light, visible light and infrared light in the spectrum, the proportion of red, green and blue in the visible light part is similar to that of sunlight, and the color rendering index is close to 100. The spectrum of sunlight may be referred to as the full spectrum.
The current mature technology of full-spectrum LED illumination mainly comprises the following steps: violet light excited full spectrum, single blue light excited full spectrum, double blue light excited full spectrum. Whichever technique is used, the solar spectrum is shaped as much as possible in the visible region, with Ra approaching 100 and the R9-15 parameter approaching 100 as much as possible. Currently, full spectrum LED technology has been able to achieve Ra >95, and R9-R15 are also all able to achieve greater than 90.
JP2019054286A discloses a full spectrum LED light source using an LED chip to excite a mixed phosphor, wherein the mixed phosphor is a nitrogen oxide blue-green phosphor (BaSi)2O2N2) Yellow-green aluminate phosphor (M)3Al5O12:Ce3+) And nitride red phosphor CaAlSiN3:Eu2+Mixing the three kinds of fluorescent powder. But the aging of the full-spectrum LED light sourcePoor energy and stability.
The prior art reports La8Ca2(Si4P2O22N2)O2：Eu2+Blue-green phosphor and CaAlSiN 3: eu (Eu)2+Red phosphor blend (Preparation and phosphor of novel La)8Ca2(Si4P2O22N2)O2oxynitride phosphors containing Eu2+/Ce3+/Tb3+ions, Langping Dong et al, Dalton trans, 2019,48, 3028-. However, La8Ca2(Si4P2O22N2)O2：Eu2+The blue-green fluorescent powder has low luminous efficiency, and especially has lower luminous efficiency under the excitation of the common purple light wave band (350-400nm), thereby limiting the application in white light devices. In addition, the phosphor has a low color purity, resulting in a low color rendering index in white light applications. And the report only realizes white light emission, and does not realize the emission of full spectrum white light.
Therefore, the development of a full-spectrum white light LED light source with excellent aging performance, good stability, high color rendering index and high brightness is of great significance.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a full-spectrum LED light source; the full-spectrum LED provided by the invention has the advantages of excellent aging performance, good stability, high color rendering index and high brightness.
The full-spectrum LED light source is realized by the following technical scheme.
A full spectrum LED light source, comprising:
the excitation light source is an LED chip;
the fluorescent layer is arranged above the excitation light source and comprises a fluorescent powder group and a transparent material, wherein the fluorescent powder group comprises first fluorescent powder, second fluorescent powder and third fluorescent powder;
wherein the first phosphor comprises La8Ba2-x-yMx(Si4P2O22N2)O2:yEu2+Wherein M is one or more of Ca, Sr and Mg, and x is more than or equal to 0<2，0.002≤y≤0.10,2-x-y>0；
The second phosphor comprises (Y, Lu)3(Al,Ga)5O12:Ce3+、(Ba,Sr)2SiO4:Eu2+One or more of;
the third phosphor comprises (Sr, Ca) AlSiN3:Eu2+、K2(Si,Ge)F6:Mn4+、Mg8Ce2O11F2:Mn4+One or more of (a).
In order to achieve the purpose of the invention, the invention provides a preferable scheme of a full-spectrum LED light source.
In a preferred embodiment of the present invention, x is 0. ltoreq. x.ltoreq.1 in the first phosphor.
In a preferred embodiment of the present invention, x in the first phosphor is 0.
In a preferred embodiment of the present invention, M in the first phosphor is selected from Sr and Ca, x is more than 0 and less than or equal to 1, and y is more than or equal to 0.002 and less than or equal to 0.10.
In a preferred embodiment of the present invention, M in the first phosphor is selected from Sr and Ca, 0 < x.ltoreq.1, and 0.002. ltoreq. y.ltoreq.0.10.
In a preferred embodiment of the present invention, the mass percentages of the first phosphor, the second phosphor, and the third phosphor are 30% to 40%: 40% -50%: 10 to 20 percent.
In a preferred embodiment of the present invention, the first phosphor is preferably La8Ba2(Si4P2O22N2)O2:yEu2+Y is more than or equal to 0.002 and less than or equal to 0.10; the second phosphor is preferably (Y, Lu)3(Al,Ga)5O12:Ce3+(ii) a The third phosphor is preferably (Sr, Ca) AlSiN3:Eu2+. The full-spectrum LED light source obtained by combining the three fluorescent powders has a higher color rendering index, and the color reducibility of the illuminated object is better.
As a preferred embodiment of the present invention, in the full-spectrum LED light source provided by the present invention, the phosphor group further includes a fourth phosphor, and the fourth phosphor includes (Sr, Ba, Ca)5(PO4)3Cl:Eu2+、Sr3MgSiO8Eu2+One or more of (a).
As a preferable scheme of the present invention, the mass percentages of the first phosphor, the second phosphor, the third phosphor and the fourth phosphor are 20% to 30%: 30% -40%: 10% -20%: 10 to 20 percent.
In a preferred embodiment of the present invention, the first phosphor is preferably La8Ba2(Si4P2O22N2)O2:yEu2+(ii) a The second phosphor is preferably (Y, Lu)3(Al,Ga)5O12:Ce3+(ii) a The third phosphor is preferably (Sr, Ca) AlSiN3:Eu2+The fourth phosphor is preferably (Sr, Ba, Ca)5(PO4)3Cl:Eu2+. The full-spectrum LED light source obtained by combining the four kinds of fluorescent powder has a higher color rendering index and is richer and fuller in light source spectrum.
In the full-spectrum LED light source provided by the invention, an excitation light source adopts an LED chip with an emission wavelength of 380-430 nm. The emission peak range of the first fluorescent powder is 480-520 nm; the emission peak range of the second fluorescent powder is 500-590 nm; the emission peak range of the third fluorescent powder is 600-700 nm.
In the full-spectrum LED light source provided by the invention, an excitation light source adopts an LED chip with an emission wavelength of 380-430 nm, and the emission peak range of the fourth fluorescent powder is 430-500 nm.
As a preferred embodiment of the present invention, the fluorescent layer may be coated on the surface of the excitation light source by a coating or spraying process, or the display membrane structure is disposed above the excitation light source at a certain distance; the full-spectrum LED device adopts a packaging structure of a direct insertion type, a surface mount type, an integrated COB, a filament lamp and a CSP.
Compared with the prior art, the full-spectrum LED light source provided by the invention has the following remarkable excellent effects:
(1) excellent stability and aging properties: the full-spectrum LED light source provided by the invention is the same as the blue-green fluorescent powder (BaSi) disclosed by the prior art2O2N2：Eu2+) Yellow-green aluminate phosphor (M)3Al5O12:Ce3+M is Y, Lu, Sc, La, Gd) and nitride red phosphor (CaAlSiN)3:Eu2+) Compared with a full-spectrum LED prepared by mixing, the stability and the aging performance are greatly improved.
(2) High brightness: compared with the prior art, the full-spectrum LED light source provided by the invention has the advantage that the brightness is greatly improved.
(3) High color rendering index: the full-spectrum LED light source provided by the invention has the color rendering index Ra of more than 95 and the special color rendering indexes R1-R15 of more than 95.
Drawings
FIG. 1 is a graph comparing the aging performance of example 5 of the present invention with that of comparative example 1.
FIG. 2 is a spectrum diagram of an LED light source according to embodiment 5 of the present invention.
FIG. 3 La according to the present invention8Ba2(Si4P2O22N2)O2:0.01Eu2+And La has been disclosed8Ca2(Si4P2O22N2)O2：0.01Eu2+Comparison graph of excitation spectrum of blue-green fluorescent powder.
FIG. 4 La according to the present invention8Ba2(Si4P2O22N2)O2:0.01Eu2+And La has been disclosed8Ca2(Si4P2O22N2)O2：0.01Eu2+And (3) a comparison graph of emission spectra of the blue-green fluorescent powder.
Detailed Description
The technical solution of the present invention will be further described with reference to the embodiments. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
In the white LED light source provided by the present invention, the preparation method of the first phosphor may be:
the method comprises the following steps: according to the chemical formula La8Ba2-x-yMx(Si4P2O22N2)O2：yEu2+Weighing a compound containing La, a compound containing Ba, a compound containing M, a compound containing Si, a compound containing P and a compound containing Eu, grinding and uniformly mixing to obtain a mixture; wherein, the La-containing compound is La-containing nitride or oxide; the Ba-containing compound is oxide, carbonate or nitride; the M-containing compound is an oxide, carbonate or nitride of Ca, Sr or Mg; the Si-containing compound is Si-containing oxide and nitride; the P-containing compound being NH4H2PO4Or (NH)4)2HPO4(ii) a The Eu-containing compound is Eu-containing oxide, nitride or halide;
step two: roasting the mixture obtained in the step one to obtain fluorescent powder; the roasting is carried out at 5-20% H2+95％～80％N2The reaction is carried out under the atmosphere; the roasting temperature is 1450-1800 ℃, and the roasting time is 1-10 hours;
step three: grinding and dispersing the fluorescent powder obtained in the step two to obtain La8Ba2-x-yMx(Si4P2O22N2)O2：yEu2+And (3) fluorescent powder.
The preparation methods of the second phosphor, the third phosphor and the fourth phosphor can refer to the preparation methods in the prior art.
The invention provides a full spectrum LED light source. The following are preferred embodiments of the present invention and should not be construed as limiting the scope of the invention.
Example 1
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.99(Si4P2O22N2)O2:0.01Eu2+Weighing the following4g of fluorescent powder, (Y, Lu)3(Al,Ga)5O12:Ce3+4.5g of second phosphor, (Sr, Ca) AlSiN3:Eu2+1.5g of the third phosphor was mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1-R15 of more than 95 and the color temperature of 6351K.
Example 2
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.998(Si4P2O22N2)O2:0.002Eu2+3.5g of the first fluorescent powder, (Y, Lu) is weighed3(Al,Ga)5O12:Ce3+5g of second phosphor, (Sr, Ca) AlSiN3:Eu2+1.5g of the third phosphor was mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1-R15 of more than 95 and the color temperature of 6341K.
Example 3
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.995(Si4P2O22N2)O2:0.005Eu2+3.2g of the first fluorescent powder, (Y, Lu) is weighed3(Al,Ga)5O12:Ce3+4.8g of second phosphor, (Sr, Ca) AlSiN3:Eu2+And 2g of third fluorescent powder is mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1-R15 of more than 95 and the color temperature of 6451K.
Example 4
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.96(Si4P2O22N2)O2:0.04Eu2+3.8g of first fluorescent powder is weighed, (Y, Lu)3(Al,Ga)5O12:Ce3+4.2g of second phosphor, (Sr, Ca) AlSiN3:Eu2+And 2g of third fluorescent powder is mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1-R15 of more than 95 and the color temperature of 6235K.
Example 5
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.92(Si4P2O22N2)O2:0.08Eu2+3.8g of first fluorescent powder is weighed, (Y, Lu)3(Al,Ga)5O12:Ce3+4.7g of second phosphor, (Sr, Ca) AlSiN3:Eu2+1.5g of the third phosphor was mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1-R15 of more than 95 and the color temperature of 6562K.
FIG. 1 is a graph comparing the aging performance of example 5 with that of comparative example 1 below, wherein the aging of the full spectrum LED light source of example 5 of the present invention is better than that of comparative example 1 by long-term ignition aging for 1000 hours under the environmental conditions of 85 ℃ temperature and 85RH humidity; after 1000 hours of aging, the aging decay of example 5 was reduced by 7.5% compared to comparative example 1.
Fig. 2 is a spectrum diagram of the LED light source corresponding to embodiment 5, and the combined phosphor is excited by the 420nm violet chip, so that the LED emission spectrum substantially covers the visible light range of 380-780 nm, and the full spectrum high-color rendering effect is achieved.
Example 6
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.99(Si4P2O22N2)O2:0.01Eu2+3.6g of the first fluorescent powder is weighed,(Y,Lu)3(Al,Ga)5O12:Ce3+second phosphor 4.5g, K2(Si,Ge)F6:Mn4+1.9g of the third phosphor was mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1-R15 of more than 95 and the color temperature of 6233K.
Example 7
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.99(Si4P2O22N2)O2:0.01Eu2+3.5g of the first fluorescent powder is weighed, (Y, Lu)3(Al,Ga)5O12:Ce3+4.5g of second phosphor, Mg8Ce2O11F2:Mn4+And 2g of third fluorescent powder is mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1-R15 of more than 95 and the color temperature of 6431K.
Example 8
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.99(Si4P2O22N2)O2:0.01Eu2+3.3g of the first phosphor is weighed, (Ba, Sr)2SiO4:Eu2+4.7g of second phosphor, (Sr, Ca) AlSiN3:Eu2+And 2g of third fluorescent powder is mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1 to R15 of more than 95 and the color temperature of 6344K.
Example 9
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.99(Si4P2O22N2)O2:0.01Eu2+3.8g of first fluorescent powder is weighed, (Ba, Sr)2SiO4:Eu2+Second phosphor 4.2g, K2(Si,Ge)F6:Mn4+2g of the third type of the light powder is mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1-R15 of more than 95 and the color temperature of 6544K.
Example 10
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.85Sr0.1(Si4P2O22N2)O2:0.05Eu2+3.5g of the first fluorescent powder is weighed, (Y, Lu)3(Al,Ga)5O12:Ce3+4.8g of second phosphor, (Sr, Ca) AlSiN3:Eu2+1.7g of the third phosphor was mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1-R15 of more than 95 and the color temperature of 6543K.
Example 11
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.45Sr0.5(Si4P2O22N2)O2:0.05Eu2+3.2g of the first phosphor is weighed, (Y, Lu)3(Al,Ga)5O12:Ce3+4.8g of second phosphor, (Sr, Ca) AlSiN3:Eu2+And 2g of third fluorescent powder is mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1-R15 of more than 95 and the color temperature of 6241K.
Example 12
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.65Ca0.3(Si4P2O22N2)O2:0.05Eu2+3.7g of first fluorescent powder (Y, Lu) is weighed3(Al,Ga)5O12:Ce3+4.8g of second phosphor, (Sr, Ca) AlSiN3:Eu2+1.5g of the third phosphor was mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1 to R15 of more than 95 and the color temperature of 6342K.
Example 13
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.75Ca0.1Sr0.1(Si4P2O22N2)O2:0.05Eu2+3.5g of the first fluorescent powder is weighed, (Y, Lu)3(Al,Ga)5O12:Ce3+4.8g of second phosphor, (Sr, Ca) AlSiN3:Eu2+1.7g of the third phosphor was mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1-R15 of more than 95 and color temperature 6654K.
Example 14
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.45Ca0.2Sr0.3(Si4P2O22N2)O2:0.05Eu2+3.5g of the first fluorescent powder is weighed, (Y, Lu)3(Al,Ga)5O12:Ce3+4.8g of second phosphor, (Sr, Ca) AlSiN3:Eu2+1.7g of the third phosphor was mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1-R15 of more than 95 and color temperature 6654K.
Example 15
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.99(Si4P2O22N2)O2:0.01Eu2+Weighing 3g of first fluorescent powder, (Y, Lu)3(Al,Ga)5O12:Ce3+4g of second phosphor, (Sr, Ca) AlSiN3:Eu2+Third phosphor 1.5g, (Sr, Ba, Ca)5(PO4)3Cl:Eu2+1.5g of the fourth phosphor was mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1-R15 of more than 95 and color temperature 6626K.
Example 16
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.99(Si4P2O22N2)O2:0.01Eu2+Weighing 3g of first fluorescent powder, (Y, Lu)3(Al,Ga)5O12:Ce3+4g of second phosphor, (Sr, Ca) AlSiN3:Eu2+1.5g of third phosphor, Sr3MgSiO8Eu2+1.5g of the fourth phosphor was mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1-R15 of more than 95 and color temperature 6478K.
Example 17
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.99(Si4P2O22N2)O2:0.01Eu2+Weighing 2.5g of first fluorescent powder, (Ba, Sr)2SiO4:Eu2+3.5g of second phosphor, (Sr, Ca) AlSiN3:Eu2+Third phosphor 2g, (Sr, Ba, Ca)5(PO4)3Cl:Eu2+Fourth phosphor 2gMixing is carried out. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1-R15 of more than 95 and color temperature 6478K.
Example 18
The excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula La8Ba1.99(Si4P2O22N2)O2:0.01Eu2+Weighing 2.7g of first fluorescent powder, (Y, Lu)3(Al,Ga)5O12:Ce3++ second phosphor 3.5g, K2(Si,Ge)F6:Mn4 +Third phosphor 1.8g, (Sr, Ba, Ca)5(PO4)3Cl:Eu2+2g of fourth type phosphor was mixed. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 99, R1 to R15 of more than 95 and the color temperature of 6346K.
Comparative example 1:
the excitation light source selects an LED chip with the peak wavelength of 420 nm; according to the chemical formula BaSi2O2N2Weighing 3g of first fluorescent powder, (Y, Lu)3(Al,Ga)5O12:Ce3++ 6g of second phosphor, (Sr, Ca) AlSiN3:Eu2+And mixing 1g of third fluorescent powder. The fluorescent powder mixture is firstly mixed with the organic silica gel transparent material in a centrifugal stirring mode, and then the mixture is combined with the LED chip in a certain packaging structure to manufacture the LED finished product light source. The full-spectrum white LED has the color rendering index Ra of 95, R1 to R15 of more than 90 and the color temperature of 6356K.
Table 1: the luminance and aging properties of inventive examples 1-18 were compared with those of comparative example 1.
As can be seen from Table 1, the full-spectrum LED of the invention has excellent aging performance, and the light efficiency maintenance rate reaches 89-93% after 1000h aging, which is obviously superior to the aging performance of the full-spectrum LED in the prior art. Meanwhile, the full-spectrum LED light source provided by the invention has high brightness, and the relative brightness under the excitation of the 420nm LED chip reaches 107-112%, which is far more than that of the prior art.
Table 2 detailed comparison of color rendering index of some examples of the present invention with comparative example 1.
The full-spectrum LED light source provided by the invention has the advantages of excellent aging performance, high brightness and the like, and has a high color rendering index, wherein the color rendering index Ra is more than 95, and R1-R15 is more than 95.
As can be seen from FIG. 3, La obtained by the present invention8Ba2(Si4P2O22N2)O2:0.01Eu2+The blue-green light material mainly emits blue-green light with the wavelength of 400-650 nm, and the emission intensity is obviously higher than that of La8Ca2(Si4P2O22N2)O2：0.01Eu2+. FIG. 4 shows La obtained by the present invention8Ba2(Si4P2O22N2)O2:0.01Eu2+And La has been disclosed8Ca2(Si4P2O22N2)O2：0.01Eu2+The excitation spectrum contrast graph (the monitoring wavelength is 500nm) shows that the fluorescent powder obtained by the invention has higher excitation efficiency and is suitable for near ultraviolet excitation as shown in figure 4.
The above are merely embodiments of the present invention, which are described in more detail and in more detail, but the scope of the invention should not be construed as being limited thereby. It should be noted that, for those skilled in the art, various changes and modifications can be made without departing from the spirit of the present invention, and these changes and modifications are within the scope of the present invention.
Claims (13)
1. A full spectrum LED light source, comprising:
the excitation light source is an LED chip;
the fluorescent layer is arranged above the excitation light source and comprises a fluorescent powder group and a transparent material, wherein the fluorescent powder group comprises first fluorescent powder, second fluorescent powder and third fluorescent powder;
wherein the first phosphor comprises La8Ba2-x-yMx(Si4P2O22N2)O2:yEu2+Wherein M is one or more of Ca, Sr and Mg, and x is more than or equal to 0<2，0.002≤y≤0.10,2-x-y>0；
The second phosphor comprises (Y, Lu)3(Al,Ga)5O12:Ce3+、(Ba,Sr)2SiO4:Eu2+One or more of;
the third phosphor comprises (Sr, Ca) AlSiN3:Eu2+、K2(Si,Ge)F6:Mn4+、Mg8Ce2O11F2:Mn4+One or more of (a).
2. The full spectrum LED light source of claim 1, wherein 0 ≦ x ≦ 1 for the first phosphor.
3. The full spectrum LED light source of claim 1, wherein x in said first phosphor is 0.
4. The full-spectrum LED light source of claim 1, wherein M in the first phosphor is selected from Sr and Ca, 0 < x ≦ 1, and 0.002 ≦ y ≦ 0.10.
5. The full-spectrum LED light source of claim 1, wherein M in the first phosphor is selected from the group consisting of Sr and Ca, 0 < x.ltoreq.1, 0.002. ltoreq. y.ltoreq.0.10.
6. The full-spectrum LED light source of claim 1, wherein the mass percentages of the first phosphor, the second phosphor, and the third phosphor are 30% to 40%: 40% -50%: 10 to 20 percent.
7. The full-spectrum LED light source of claim 1, wherein said first phosphor is La8Ba2(Si4P2O22N2)O2:yEu2+Y is more than or equal to 0.002 and less than or equal to 0.10; the second fluorescent powder is (Y, Lu)3(Al,Ga)5O12:Ce3+(ii) a The third phosphor is (Sr, Ca) AlSiN3:Eu2+。
8. The full-spectrum LED light source of claim 1, wherein said set of phosphors further comprises a fourth phosphor, said fourth phosphor comprising (Sr, Ba, Ca)5(PO4)3Cl:Eu2+、Sr3MgSiO8Eu2+One or more of (a).
9. The full-spectrum LED light source of claim 8, wherein the mass percentages of the first phosphor, the second phosphor, the third phosphor and the fourth phosphor are 20% to 30%: 30% -40%: 10% -20%: 10 to 20 percent.
10. The full-spectrum LED light source of claim 8, wherein said first phosphor is La8Ba2(Si4P2O22N2)O2:yEu2+(ii) a The second fluorescent powder is (Y, Lu)3(Al,Ga)5O12:Ce3+(ii) a The third phosphor is (Sr, Ca) AlSiN3:Eu2+The fourth phosphor is (Sr, Ba, Ca)5(PO4)3Cl:Eu2+。
11. The full-spectrum LED light source as claimed in claim 1, wherein the excitation light source is an LED chip with an emission wavelength of 380-430 nm.
12. The full-spectrum LED light source as claimed in claim 1, wherein the emission peak of the first phosphor is in the range of 480-520 nm; the emission peak range of the second fluorescent powder is 500-590 nm; the emission peak range of the third fluorescent powder is 600-700 nm.
13. The full-spectrum LED light source as claimed in claim 8, wherein the excitation light source employs an LED chip with an emission wavelength of 380-430 nm, and the emission peak of the fourth phosphor is in the range of 430-500 nm.
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