CN116769473A - Fluorescent powder composition and LED device - Google Patents
Fluorescent powder composition and LED device Download PDFInfo
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- 239000000843 powder Substances 0.000 title claims abstract description 94
- 239000000203 mixture Substances 0.000 title claims abstract description 66
- 238000009877 rendering Methods 0.000 claims abstract description 32
- 230000005284 excitation Effects 0.000 claims abstract description 10
- 108010043121 Green Fluorescent Proteins Proteins 0.000 claims abstract description 8
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 99
- 239000000126 substance Substances 0.000 claims description 40
- 229910004283 SiO 4 Inorganic materials 0.000 claims description 25
- 229910052712 strontium Inorganic materials 0.000 claims description 20
- 229910052693 Europium Inorganic materials 0.000 claims description 19
- OGPBJKLSAFTDLK-UHFFFAOYSA-N europium atom Chemical compound [Eu] OGPBJKLSAFTDLK-UHFFFAOYSA-N 0.000 claims description 19
- 229910052791 calcium Inorganic materials 0.000 claims description 16
- 229910052784 alkaline earth metal Inorganic materials 0.000 claims description 15
- 150000001342 alkaline earth metals Chemical class 0.000 claims description 15
- 102100032047 Alsin Human genes 0.000 claims description 13
- 101710187109 Alsin Proteins 0.000 claims description 13
- 229910052788 barium Inorganic materials 0.000 claims description 13
- 229910052915 alkaline earth metal silicate Inorganic materials 0.000 claims description 10
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 claims description 9
- 229910052710 silicon Inorganic materials 0.000 claims description 9
- 239000010703 silicon Substances 0.000 claims description 9
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 claims description 7
- 238000004020 luminiscence type Methods 0.000 claims description 7
- 239000008393 encapsulating agent Substances 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 17
- 238000001228 spectrum Methods 0.000 abstract description 17
- 239000000463 material Substances 0.000 abstract description 4
- 239000011575 calcium Substances 0.000 description 24
- 229910052761 rare earth metal Inorganic materials 0.000 description 14
- -1 rare earth ions Chemical class 0.000 description 13
- 238000004806 packaging method and process Methods 0.000 description 12
- 230000000052 comparative effect Effects 0.000 description 9
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- 238000010586 diagram Methods 0.000 description 4
- 239000003292 glue Substances 0.000 description 4
- 238000012360 testing method Methods 0.000 description 4
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 3
- 230000007423 decrease Effects 0.000 description 3
- 238000005286 illumination Methods 0.000 description 3
- 150000002500 ions Chemical class 0.000 description 3
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- OYPRJOBELJOOCE-UHFFFAOYSA-N Calcium Chemical compound [Ca] OYPRJOBELJOOCE-UHFFFAOYSA-N 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- DSAJWYNOEDNPEQ-UHFFFAOYSA-N barium atom Chemical compound [Ba] DSAJWYNOEDNPEQ-UHFFFAOYSA-N 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
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- 238000001429 visible spectrum Methods 0.000 description 1
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Abstract
The invention relates to a fluorescent powder composition and an LED device, and belongs to the technical field of fluorescent powder materials. The fluorescent powder composition comprises the following components in percentage by mass: 5-35% of blue-green fluorescent powder; 10-30% of green fluorescent powder; 30-65% of yellow fluorescent powder; 3-15% of red fluorescent powder. The fluorescent powder composition can provide high color rendering index and full spectrum luminous effect, and under the excitation of a single-band blue light LED chip, the color rendering index Ra is more than or equal to 98, R1-R15 is more than or equal to 93, thereby meeting the use requirement of higher requirements on the color parameters.
Description
Technical Field
The invention relates to the technical field of fluorescent powder materials, in particular to a fluorescent powder composition and an LED device.
Background
As a new generation of green illumination Light source, LEDs (Light-Emitting Diode) have the advantages of high luminous efficiency, energy saving, environmental protection, long service life, no toxicity, environmental protection, and the like, and are widely used in the fields of illumination, backlight display, and the like. Along with the improvement of living standard, the requirements of people on the light quality of the LED light source are higher and higher, especially for special application scenes such as art and photography with higher requirements on the color reduction degree, and higher requirements are put forward on the high color rendering index and full spectrum of the light source.
In the prior art, the color rendering index of the fluorescent powder collocation scheme after the single-band LED blue light chip is excited can only just meet Ra & gt 97, R1-R15 & gt 90, the optimal level is not reached, and the use requirement of the special field with higher requirements on the color parameters can not be met.
Disclosure of Invention
The embodiment of the invention provides a fluorescent powder composition and an LED device, which can provide high color rendering index and full spectrum luminous effect. The technical scheme is as follows:
in a first aspect, embodiments of the present invention provide a phosphor composition, including the following components in percentage by mass: 5-35% of blue-green fluorescent powder; 10-30% of green fluorescent powder; 30-65% of yellow fluorescent powder; 3-15% of red fluorescent powder;
the blue-green fluorescent powder comprises divalent europium-doped alkaline earth metal silicon oxynitride, and the light-emitting peak wavelength range is 480-500 nm;
the green fluorescent powder comprises trivalent europium doped alkaline earth metal silicate, and the light-emitting peak wavelength range is 520nm-540nm;
the yellow fluorescent powder comprises alkaline earth metal silicate doped with divalent europium, and the light-emitting peak wavelength range is 540nm-570nm;
the red fluorescent powder comprises divalent europium doped alkaline earth metal silicon aluminum nitride, and the light-emitting peak wavelength range is 650nm-670nm.
Preferably, the blue-green phosphor includes at least one of substances having a chemical formula I,
X 1 1-x Si 2 O 2 N 2 :xEu 2+ chemical formula I
In the chemical formula I, the X 1 At least one selected from Ba, ca and Sr, wherein x is more than or equal to 0.001 and less than or equal to 0.5;
the green phosphor includes at least one of substances having a chemical formula II,
X 2 2-y SiO 4 :yEu 3+ formula II
In the chemical formula II, the X 2 At least one selected from Ba and Sr, wherein y is more than or equal to 0.001 and less than or equal to 0.5;
the yellow phosphor includes at least one of substances having a chemical formula III,
X 3 2-z SiO 4 :zEu 2+ formula III
In the formula III, the X 3 At least one selected from Ba and Sr, wherein the value range of z is more than or equal to 0.001 and less than or equal to 0.5;
the red phosphor includes at least one of substances having a chemical formula IV,
X 4 1-m AlSiN 3 :mEu 2+ chemical formula IV
In the formula IV, the X 4 At least one of Sr and Ca, and m is more than or equal to 0.001 and less than or equal to 0.5.
Preferably, the ratio of x in the chemical formula I, y in the chemical formula II, z in the chemical formula III and m in the chemical formula IV is 1 (3.7-4.2): 3.8-4.5): 1.5-2.2.
Preferably, the value range of x in the chemical formula I is 0.005-0.018.
Preferably, the fluorescence peak wavelength of the excitation light source of the fluorescent powder composition ranges from 447.5nm to 455nm.
In a second aspect, embodiments of the present invention provide an LED device comprising a phosphor composition as described in any one of the above.
Preferably, the LED device further comprises an LED chip, and the light-emitting peak wavelength range of the LED chip is 447.5nm-455nm.
Preferably, the light-emitting peak wavelength range of the LED chip is 450nm-452.5nm.
Preferably, the LED device further comprises LED packaging glue, and the mixing mass ratio relationship of the fluorescent powder composition and the LED packaging glue is 1 (1.2-3.9).
Preferably, the color rendering index of the LED device is Ra is more than or equal to 98, and R1-R15 is more than or equal to 93.
Preferably, the color temperature range of the LED device is 2500K-6800K.
According to the fluorescent powder composition and the LED device, the relation between the component substances and the component contents in the fluorescent powder composition is improved, so that the fluorescent powder composition has a wider luminous color range after a single-band blue LED chip is excited, and a full-spectrum luminous effect can be realized; in terms of color rendering index, the color rendering index Ra is more than or equal to 98, R1-R15 is more than or equal to 93, the color rendering performance is better, and more real and accurate color display is provided; the high-quality luminous effect with high color rendering index and full spectrum is provided while the high photoelectric conversion efficiency is maintained.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural view of an LED device provided in an exemplary embodiment of the present invention;
FIG. 2 is a graph showing the luminescence spectrum of the LED device of embodiment 1 of the present invention;
FIG. 3 is a graph showing the luminescence spectrum of the LED device of embodiment 2 of the present invention;
FIG. 4 is a graph showing the luminescence spectrum of the LED device of embodiment 3 of the present invention;
fig. 5 is a graph showing the emission spectrum of the LED device of example 4 of the present invention.
Detailed Description
The present invention will be described in further detail with reference to specific embodiments in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
In the present invention, the content range, color temperature range, wavelength range, etc. of the phosphor is represented as a-b, meaning that the content, color temperature, or wavelength of the phosphor may be any value between a and b, including a and b.
Color rendering index (CRI, color Rendering Index), color temperature (CCT, correlated Color Temperature) and color coordinates (Chromaticity Coordinates) are three important parameters describing the color properties of a light source.
The color rendering index is an indicator that measures the ability of a light source to reduce the color of an object. It is evaluated based on the difference in color of the object under illumination of the standard light source and the light source to be tested. The value range of the color rendering index is 0 to 100, and the higher the value is, the more accurately the light source can restore the true color of the object.
Color temperature is a physical quantity used to describe the appearance of the color of a light source. It is expressed in absolute temperature (in Kelvin, K) based on the nature of the thermal radiating black body. The higher the color temperature, the closer the color the light source exhibits to blue (cool tone); the lower the color temperature, the closer the color the light source assumes to red (warm tone). For example, the color temperature of daylight color is typically 5500K-6500K, and the color temperature of warm white is typically 2700K-3500K.
The color coordinates are used to describe the location of the color of the light source in the chromaticity diagram. The position in the CIE 1931 chromaticity diagram is typically determined in (x, y) coordinates on the basis of the CIE 1931 chromaticity diagram to represent the color of the light source.
LED devices play an important role in modern lighting and display fields. In recent years, with the rapid development of technology, requirements for light color quality and spectrum range of LED devices are increasing. However, under the current technical condition, the fluorescent powder matching scheme after the excitation of the single-band LED blue light chip can meet the requirement of Ra > 97 and R1-R15 > 90 on the color rendering index, but still cannot meet the requirement of the special field on the high color rendering index and the full spectrum.
Therefore, the embodiment of the invention provides a fluorescent powder composition, which comprises the following components in percentage by mass: 5-35% of blue-green fluorescent powder; 10-30% of green fluorescent powder; 30-65% of yellow fluorescent powder; 3-15% of red fluorescent powder;
the blue-green fluorescent powder comprises divalent europium-doped alkaline earth metal silicon oxynitride, and the light-emitting peak wavelength range is 480-500 nm;
the green fluorescent powder comprises trivalent europium doped alkaline earth metal silicate, and the light-emitting peak wavelength range is 520nm-540nm;
the yellow fluorescent powder comprises alkaline earth metal silicate doped with divalent europium, and the light-emitting peak wavelength range is 540nm-570nm;
the red fluorescent powder comprises divalent europium doped alkaline earth metal silicon aluminum nitride, and the light-emitting peak wavelength range is 650nm-670nm.
The above-mentioned blue-green phosphor, yellow phosphor and red phosphor are mainly named according to the color of light emitted from the phosphor after being excited. The specific color depends on the material composition and structure of the phosphor, the type of doped activator, and the like. For example, "blue-green phosphor" refers to a phosphor that emits blue-green light, with a peak emission wavelength typically in the range of 480-500 nm.
In the embodiment of the invention, the blue-green fluorescent powder and the green fluorescent powder provide strong luminous intensity in a blue-green region and a green region of a luminous spectrum, can be matched with the luminous characteristic of a blue light LED chip, and can greatly improve the color rendering index. The yellow phosphor and the red phosphor provide necessary luminous intensity in a long wavelength region, further enrich the color representation and improve the color temperature of white light. The addition of the red fluorescent powder effectively fills the defect of spectrum at the long wavelength end, so that the white light is closer to natural light, and better color temperature and color rendering index are provided. Therefore, through the synergistic effect of the four fluorescent powders, the luminous effect with high efficiency, high color rendering index and full spectrum can be realized.
In the embodiment of the invention, europium doped alkaline earth metal silicon oxynitride, alkaline earth metal silicate and alkaline earth metal silicon aluminum nitride can be adopted as fluorescent powder, europium (Eu) is a rare earth element, and the europium (Eu) acts as an activator in the fluorescent powder, and after being excited, the europium element emits light. The europium element has good luminous performance and stability, and can keep excellent luminous performance under wider temperature and current conditions. For example, a "europium doped alkaline earth metal silicon oxynitride" phosphor is produced by doping europium into an alkaline earth metal silicon oxynitride so that it emits light of a specific color when excited. Alkaline earth metal refers to the second group of the periodic table, and mainly includes calcium (Ca), strontium (Sr), and barium (Ba) in the phosphor. In some embodiments, the valence and doping concentration of europium can affect the luminescent color and intensity of the phosphor.
In the embodiment of the invention, europium-doped alkaline earth metal silicon oxynitride, alkaline earth metal silicate and alkaline earth metal silicon aluminum nitride are adopted as fluorescent powder, and the compounds have good chemical stability and physical stability, so that the thermal stability and the optical stability of the fluorescent powder can be effectively improved, and the service life of the fluorescent powder is prolonged. When excited, the europium-doped alkaline earth metal silicate fluorescent powder can emit yellow or green light with a wide spectrum, enriches the whole light-emitting spectrum and improves the color rendering index. The alkaline earth silicate phosphor has good spectral matching with other phosphors (silicon oxynitride and silicon aluminum nitride). In the spectrum superposition and light energy conversion processes, the alkaline earth metal silicate fluorescent powder can generate synergistic effect with other fluorescent powder, and the uniformity and continuity of the whole spectrum are improved. According to the embodiment of the invention, through improving the collocation scheme of the fluorescent powder composition, the full spectrum luminous effect is realized after the single-band LED blue light chip is excited, and meanwhile, the high color rendering performance with the color rendering index Ra being more than or equal to 98 and the R1-R15 being more than or equal to 93 can be achieved, so that the high requirements of the special field are met.
In some specific embodiments, the blue-green phosphor is a divalent europium-doped alkaline earth metal silicon oxynitride comprising at least one of the substances represented by formula I,
X 1 1-x Si 2 O 2 N 2 :xEu 2+ chemical formula I
In the chemical formula I, the X 1 At least one selected from Ba, ca and Sr, and the value range of x is more than or equal to 0.001 and less than or equal to 0.5. For example, x has a value of 0.05, and the blue-green phosphor may be (Ba, ca, sr) 0.95 Si 2 O 2 N 2 :0.05Eu 2+ . In the embodiment of the invention, (Ba, ca, sr) 0.95 The positions of Ba, ca and Sr in the chemical structure can be interchanged and can exist in any proportion, and the total molar ratio is only required to be equal to 0.95 (1-x), and the following similar chemical formulas are the same and are not repeated.
In some specific embodiments, the green phosphor is a trivalent europium doped alkaline earth silicate comprising at least one of the substances represented by formula II,
X 2 2-y SiO 4 :yEu 3+ formula II
In the chemical formula II, the X 2 At least one selected from Ba and Sr, and the value range of y is more than or equal to 0.001 and less than or equal to 0.5.
In some specific embodiments, the yellow phosphor is a divalent europium-doped alkaline earth silicate comprising at least one of the substances represented by formula III,
X 3 2-z SiO 4 :zEu 2+ formula III
In the formula III, the X 3 At least one selected from Ba and Sr, and the value range of z is more than or equal to 0.001 and less than or equal to 0.5.
In some specific embodiments, the red phosphor is a divalent europium doped alkaline earth metal silicon aluminum nitride comprising at least one of the substances represented by formula IV,
X 4 1-m AlSiN 3 :mEu 2+ chemical formula IV
In the formula IV, the X 4 At least one selected from Sr and Ca, and m is more than or equal to 0.001 and less than or equal to 0.5.
In some specific embodiments, the phosphor composition comprises the following components in mass percent:
(Ba,Ca,Sr) 1-x Si 2 O 2 N 2 :xEu 2+ 5-35％；(Ba,Sr) 2-y SiO 4 :yEu 3+ 10-30％；
(Ba,Sr) 2-z SiO 4 :zEu 2+ 30-65％；(Sr,Ca) 1-m AlSiN 3 :mEu 2+ 3-15％。
in some specific embodiments, the phosphor composition comprises the following components in mass percent:
(Ba,Ca,Sr) 1-x Si 2 O 2 N 2 :xEu 2+ 20-35％；(Ba,Sr) 2-y SiO 4 :yEu 3+ 10-20％；
(Ba,Sr) 2-z SiO 4 :zEu 2+ 45-55％；(Sr,Ca) 1-m AlSiN 3 :mEu 2+ 5-10％。
in some specific embodiments, the excitation light source of the phosphor composition may be an LED chip having a light emission peak wavelength in the range of 447.5nm to 455nm, i.e., a single band blue LED chip. Wherein, the optimal excitation wave band of the fluorescent powder composition is 450nm-452.5nm, and the luminous efficiency can reach the maximum and the color rendering index is optimal under the optimal excitation wave band.
In some specific embodiments, the ratio of x in formula I, y in formula II, z in formula III, and m in formula IV is 1 (3.7-4.2): 3.8-4.5): 1.5-2.2. I.e., x: y: z: m=1, (3.7-4.2): (3.8-4.5): (1.5-2.2).
The blue-green fluorescent powder, the yellow fluorescent powder and the red fluorescent powder can better cooperate under the proportion, and the luminous efficiency and the color rendering property of the fluorescent powder composition are optimized by accurately controlling the proportion relation of the doping concentrations of the rare earth ions in different fluorescent powders.
In some specific embodiments, the value of x is in the range of 0.005.ltoreq.x.ltoreq.0.018 in the proportion of the doping concentration of the rare earth ions in the phosphor. The values of y, z and m are determined based on the proportional relationship between x and the above.
Specifically, the ion doping concentration has an important influence on the luminescence performance of the fluorescent powder, and the proper ion doping concentration can improve the quantum efficiency, namely the luminescence efficiency, of the fluorescent powder. However, too high an ion doping concentration may cause concentration quenching of the phosphor, resulting in a decrease in luminous efficiency. Therefore, the doping concentration of the rare earth ions needs to be controlled and selected to achieve the best luminescence performance.
Referring next to fig. 1, fig. 1 is a schematic diagram showing an LED device according to an exemplary embodiment of the present invention, and as shown in fig. 1, the LED device includes a phosphor mixture 1, an LED chip 2, and a holder 3. The LED chip 2 is an electroluminescent semiconductor material chip and is fixed on the bracket 3, the LED chip 2 emits light after being electrified and lightened, and the fluorescent powder mixture 1 excited by the light emitted by the LED chip 2 forms required mixed light.
In some specific embodiments, phosphor blend 1 is a blend of a phosphor and an LED encapsulant, wherein the phosphor is any of the phosphor compositions provided in the embodiments of the present invention described above; the LED packaging adhesive can be organic silica gel for LED packaging, and mainly has the function of protecting an LED chip and simultaneously also has the tasks of dispersing fluorescent powder and transmitting light.
In some embodiments, as the proportion of LED packaging glue is increased, the relative concentration of phosphor decreases, which results in a decrease in the intensity of light emitted by the phosphor, thereby causing the color temperature of the LED light source to increase, i.e., toward a cold hue. Conversely, if the proportion of the packaging adhesive is reduced, the concentration of the fluorescent powder is relatively increased, so that the light intensity emitted by the fluorescent powder is increased, and the color temperature of the LED light source is reduced, namely, the color temperature is biased towards the warm color tone. Therefore, besides adjusting the formula of the fluorescent powder composition, the color temperature of the LED light source can be regulated by adjusting the mixing proportion of the fluorescent powder composition and the LED packaging adhesive. The mixing mass proportion relation of the fluorescent powder composition and the LED packaging adhesive in the embodiment of the invention is 1 (1.2-3.9), and the LED device can meet the requirement of diversified color temperatures by adopting the fluorescent powder composition, has the color temperature range of 2500K-6800K and is beneficial to realizing wider application scenes.
In some specific embodiments, the LED device uses a single-band blue LED chip as the excitation light source, that is, the LED chip 2 is a single-band blue LED chip, the emission peak wavelength range of which may be 447.5nm-455nm, and in order to ensure that the phosphor composition achieves the optimal emission effect, the LED chip 2 may be a single-band blue LED chip having an emission peak wavelength range of 450nm-452.5nm.
The fluorescent powder is usually excited by single-band blue light to emit light, so that the complexity and cost of equipment can be reduced, but better color stability and color mixing effect are difficult to generate. In the embodiment of the invention, the LED device adopts the fluorescent powder composition, and under the excitation of the single-band blue LED chip, the full spectrum range is covered by the luminescence, the color rendering index Ra is more than or equal to 98, and R1-R15 is more than or equal to 93, so that the LED device not only has good economy and simplicity, but also can realize excellent luminescence performance and stability, and meets diversified lighting and display requirements.
The technical scheme of the invention will be described with reference to specific examples, wherein raw materials used in the examples are all from common commercial products, and devices or equipment used in the examples are all purchased from conventional commercial sales channels.
Example 1
Embodiment 1 provides an LED device prepared by the steps of:
a Shan Languang single-band LED chip with the peak wavelength of 450nm is selected as an excitation light source; the LED chip is solidified into the bracket bowl cup by white glue, and the anode and the cathode of the LED chip are respectively connected with the anode and the cathode of the bracket bowl cup by gold wire bonding; uniformly mixing the fluorescent powder composition and the LED packaging adhesive according to the mass ratio of 1:1.62 to obtain a fluorescent powder mixture, and uniformly filling the fluorescent powder mixture into a bracket bowl cup fixed with an LED chip to obtain the LED device. Wherein, the fluorescent powder composition comprises the following components in percentage by mass:
Ca 0.99 Si 2 O 2 N 2 :0.01Eu 2+ (blue-green phosphor) 23% having a light emission peak wavelength of 493nm;
Sr 1.96 SiO 4 :0.04Eu 3+ (green phosphor) 16% having a light emission peak wavelength of 525nm;
Sr 1.96 SiO 4 :0.04Eu 2+ (yellow phosphor) 53%, which has a light emission peak wavelength of 561nm;
(Sr,Ca) 0.98 AlSiN 3 :0.02Eu 2+ (red phosphor) 8%, and the emission peak wavelength was 660nm.
Example 2
Embodiment 2 provides an LED device, which differs from embodiment 1 in that: the mixing mass ratio of the fluorescent powder composition to the LED packaging adhesive in the embodiment 2 is 1:1.82.
The phosphor composition in example 2 comprises the following components in percentage by mass:
Ca 0.99 Si 2 O 2 N 2 :0.01Eu 2+ (blue-green phosphor) 25% and a light emission peak wavelength of 493nm;
Sr 1.96 SiO 4 :0.04Eu 3+ (green phosphor) 16% having a light emission peak wavelength of 525nm;
Sr 1.96 SiO 4 :0.04Eu 2+ (yellow phosphor) 52%, which has a light emission peak wavelength of 561nm;
(Sr,Ca) 0.98 AlSiN 3 :0.02Eu 2+ (red phosphor) 7%, and the emission peak wavelength was 660nm.
Example 3
Embodiment 3 provides an LED device, which differs from embodiment 1 in that: the mixing mass ratio of the fluorescent powder composition to the LED packaging adhesive in the embodiment 3 is 1:2.96.
The phosphor composition in example 3 comprises the following components in percentage by mass:
Ca 0.99 Si 2 O 2 N 2 :0.01Eu 2+ (blue-green phosphor) 29% having a light emission peak wavelength of 493nm;
Sr 1.96 SiO 4 :0.04Eu 3+ (green phosphor) 15% having a light emission peak wavelength of 525nm;
Sr 1.96 SiO 4 :0.04Eu 2+ (yellow phosphor) 48%, which has a light emission peak wavelength of 561nm;
(Sr,Ca) 0.98 AlSiN 3 :0.02Eu 2+ (red phosphor) 8%, and the emission peak wavelength was 660nm.
Example 4
Embodiment 4 provides an LED device, which differs from embodiment 1 in that: the mixing mass ratio of the fluorescent powder composition and the LED packaging adhesive in the embodiment 4 is 1:3.82.
The phosphor composition in example 4 comprises the following components in percentage by mass:
Ca 0.99 Si 2 O 2 N 2 :0.01Eu 2+ (blue-green phosphor) 31% having a light emission peak wavelength of 493nm;
Sr 1.96 SiO 4 :0.04Eu 3+ (green phosphor) 15% having a light emission peak wavelength of 525nm;
Sr 1.96 SiO 4 :0.04Eu 2+ (yellow phosphor) 48%, which has a light emission peak wavelength of 561nm;
(Sr,Ca) 0.98 AlSiN 3 :0.02Eu 2+ (red phosphor) 6%, the emission peak wavelength of which was 660nm.
Example 5
Embodiment 5 provides an LED device, which differs from embodiment 2 in that: the doping concentration of rare earth ions of each component in the fluorescent powder composition is different; the phosphor composition of example 5 comprises the following components in mass percent:
Ca 0.99 Si 2 O 2 N 2 :0.01Eu 2+ (blue-green phosphor) 25% and a light emission peak wavelength of 493nm;
Sr 1.97 SiO 4 :0.03Eu 3+ (green phosphor) 16% having a light emission peak wavelength of 525nm;
Sr 1.95 SiO 4 :0.05Eu 2+ (yellow phosphor) 52%, which has a light emission peak wavelength of 561nm;
(Sr,Ca) 0.976 AlSiN 3 :0.024Eu 2+ (red phosphor) 7%, and the emission peak wavelength was 660nm.
Example 6
Embodiment 6 provides an LED device, which differs from embodiment 2 in that: the doping concentration of rare earth ions of each component in the fluorescent powder composition is different; the phosphor composition of example 5 comprises the following components in mass percent:
Ca 0.98 Si 2 O 2 N 2 :0.02Eu 2+ (blue-green phosphor) 25% and a light emission peak wavelength of 493nm;
Sr 1.92 SiO 4 :0.08Eu 3+ (green phosphor) 16% having a light emission peak wavelength of 525nm;
Sr 1.92 SiO 4 :0.08Eu 2+ (yellow phosphor) 52%, which has a light emission peak wavelength of 561nm;
(Sr,Ca) 0.96 AlSiN 3 :0.04Eu 2+ (red phosphor) 7%, and the emission peak wavelength was 660nm.
Example 7
Embodiment 7 provides an LED device, which differs from embodiment 2 in that: the doping concentration of rare earth ions of each component in the fluorescent powder composition is different; the phosphor composition of example 5 comprises the following components in mass percent:
Ca 0.98 Si 2 O 2 N 2 :0.02Eu 2+ (blue-green phosphor) 25% and a light emission peak wavelength of 493nm;
Sr 1.98 SiO 4 :0.02Eu 3+ (green phosphor) 16% having a light emission peak wavelength of 525nm;
Sr 1.98 SiO 4 :0.02Eu 2+ (yellow phosphor) 52%, which has a light emission peak wavelength of 561nm;
(Sr,Ca) 0.98 AlSiN 3 :0.02Eu 2+ (red phosphor) 7%, and the emission peak wavelength was 660nm.
Comparative example 1
Comparative example 1 provides an LED device, which differs from example 2 in that: the phosphor compositions are different in component content (do not contain yellow phosphor); the phosphor composition of comparative example 1 comprises the following components in mass percent:
Ca 0.99 Si 2 O 2 N 2 :0.01Eu 2+ (blue-green phosphor) 16% having a light emission peak wavelength of 493nm;
Sr 1.96 SiO 4 :0.04Eu 3+ (green phosphor) 70% having a light emission peak wavelength of 525nm;
(Sr,Ca) 0.98 AlSiN 3 :0.02Eu 2+ (red phosphor) 14%, its luminescence peak wavelength is 663nm.
Experimental example
The emission spectra of the LED devices of examples 1-4 were tested using a remote HAAS 2000 photoelectric integrating sphere device, the test results of which are shown in fig. 2-5. The LED devices of examples 1-7 and comparative example 1 were tested for light color parameters using a remote HAAS 2000 photoelectric integrating sphere device, the results of which are shown in table 1 below.
Table 1 examples 1-7 and comparative example 1 light color parameter tables
As can be seen from fig. 2-5 and table 1, embodiments 1-4 sequentially provide LED devices with color temperatures around 3000K, 4000K, 5000K and 6000K, and the LED devices provided by the embodiments of the present invention can be configured to have different color temperatures, can cover the visible spectrum, and have the advantages of both high color rendering index and full spectrum. Meanwhile, in fig. 2 to 5, the luminous intensities of the embodiments 1 to 4 in the blue light region (wavelength of about 460 nm) are low, which indicates that the LED device provided by the invention reduces the blue light ratio pertinently, and is beneficial to protecting the health of users.
Examples 1-4 in comparison with comparative example 1, the phosphor compositions of examples 1-4 contained yellow phosphor, whereas the phosphor composition of comparative example 1 did not. As is clear from Table 1, the color development effect of the LED devices of examples 1 to 4 is higher than that of comparative example 1, ra of examples 1 to 4 is 98 or more, and R1 to R15 are 93 or more; the color rendering index of the LED device of example 2 is significantly higher than that of comparative example 1, especially at the same color temperature around 4000K.
This shows that the incorporation of the yellow phosphor in the phosphor composition can effectively enhance the color rendering properties of the LED device by generating a synergistic effect with the blue-green phosphor, the green phosphor and the red phosphor, and thus the LED device has an extremely high color rendering index and excellent color reduction capability.
The components and proportions of the phosphor compositions of example 2, example 5, example 6 and example 7 are the same, and the color temperature of the LED device is about 4000K. The doping concentration proportion relation of rare earth ions between fluorescent powder components in the embodiment 2 and the embodiment 6 is x:y:z:m=1:4:4:2, and the doping concentration proportion relation of the rare earth ions provided by the invention is satisfied, namely x:y:z:m=1 (3.7-4.2): 3.8-4.5): 1.5-2.2; whereas example 5 and example 7 do not satisfy this doping concentration ratio relationship. The rare earth ion doping concentration ranges of the fluorescent powder components in the embodiment 2 and the embodiment 5 meet the rare earth ion doping concentration ranges provided by the invention, namely, x is more than or equal to 0.005 and less than or equal to 0.018; whereas examples 6 and 7 do not satisfy this doping concentration range.
As can be seen from table 1, the color development effect of the LED device of example 2 is higher than that of example 5 in example 2 compared with example 5; example 6 compared to example 7, the color development effect of the LED device of example 6 was higher than that of example 7; test results show that under the condition of meeting the proportion relation of the doping concentration of the rare earth ions, the fluorescent powder composition provided by the invention can generate a synergistic effect, so that the luminous effect of the fluorescent powder is effectively improved, and the color rendering performance of an LED device is enhanced.
As can be seen from table 1, the color development effect of the LED device of example 2 is higher than that of example 6 in example 2 compared with example 6; example 5 compared to example 7, the color development effect of the LED device of example 5 was higher than that of example 7; test results show that under the condition of meeting the doping concentration range of the rare earth ions provided by the invention, the fluorescent powder composition provided by the invention can generate a synergistic effect, so that the luminous effect of the fluorescent powder is effectively improved, and the color rendering performance of an LED device is enhanced.
In summary, the color development effects of the LED device of example 2 are higher than those of the LED devices of examples 5 and 6, and the color development effects of the LED device of example 7 are lower than those of the LED devices of examples 5 and 6, and the test results show that the fluorescent powder composition provided by the invention can produce an optimal synergistic effect and the color development performance of the LED device can reach an optimal state under the condition of simultaneously satisfying the doping concentration proportion relation and the doping concentration range of the rare earth ions provided by the invention.
The above-described embodiments are merely illustrative of the preferred embodiments of the present invention and are not intended to limit the scope of the present invention, and various modifications and improvements made by those skilled in the art to the technical solution of the present invention should fall within the scope of protection defined by the claims of the present invention without departing from the design spirit of the present invention.
Claims (10)
1. The fluorescent powder composition is characterized by comprising the following components in percentage by mass:
5-35% of blue-green fluorescent powder;
10-30% of green fluorescent powder;
30-65% of yellow fluorescent powder;
3-15% of red fluorescent powder;
the blue-green fluorescent powder comprises divalent europium-doped alkaline earth metal silicon oxynitride, and the light-emitting peak wavelength range is 480-500 nm;
the green fluorescent powder comprises trivalent europium doped alkaline earth metal silicate, and the light-emitting peak wavelength range is 520nm-540nm;
the yellow fluorescent powder comprises alkaline earth metal silicate doped with divalent europium, and the light-emitting peak wavelength range is 540nm-570nm;
the red fluorescent powder comprises divalent europium doped alkaline earth metal silicon aluminum nitride, and the light-emitting peak wavelength range is 650nm-670nm.
2. The phosphor composition of claim 1, wherein the blue-green phosphor comprises at least one of the substances of formula I,
X 1 1-x Si 2 O 2 N 2 :xEu 2+ chemical formula I
In the chemical formula I, the X 1 At least one selected from Ba, ca and Sr, wherein x is more than or equal to 0.001 and less than or equal to 0.5;
the green phosphor includes at least one of substances having a chemical formula II,
X 2 2-y SiO 4 :yEu 3+ formula II
In the chemical formula II, the X 2 At least one selected from Ba and Sr, wherein y is more than or equal to 0.001 and less than or equal to 0.5;
the yellow phosphor includes at least one of substances having a chemical formula III,
X 3 2-z SiO 4 :zEu 2+ formula III
In the formula III, the X 3 At least one selected from Ba and Sr, wherein the value range of z is more than or equal to 0.001 and less than or equal to 0.5;
the red phosphor includes at least one of substances having a chemical formula IV,
X 4 1-m AlSiN 3 :mEu 2+ chemical formula IV
In the formula IV, the X 4 At least one of Sr and Ca, and m is more than or equal to 0.001 and less than or equal to 0.5.
3. The phosphor composition of claim 2, wherein the ratio of x in formula I, y in formula II, z in formula III, and m in formula IV is 1 (3.7-4.2): (3.8-4.5): (1.5-2.2).
4. The phosphor composition of claim 3, wherein x in formula I has a value in the range of 0.005 x 0.018.
5. The phosphor composition of claim 1 or 4, wherein the excitation light source of the phosphor composition has a luminescence peak wavelength in the range of 447.5nm to 455nm.
6. An LED device comprising the phosphor composition of any one of claims 1-5.
7. The LED device of claim 6, further comprising an LED chip having a peak emission wavelength in the range of 447.5nm to 455nm.
8. The LED device of claim 6, wherein the LED chip has a peak wavelength of light emission in the range of 450nm to 452.5nm.
9. The LED device of claim 6, further comprising an LED encapsulant, wherein the phosphor composition and the LED encapsulant are mixed in a mass ratio of 1 (1.2-3.9).
10. The LED device of claim 6, wherein the LED device has a color rendering index Ra of greater than or equal to 98 and R1-R15 of greater than or equal to 93.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116751585A (en) * | 2023-06-25 | 2023-09-15 | 江苏博睿光电股份有限公司 | Fluorescent powder composition and LED device |
| CN117568035A (en) * | 2023-12-04 | 2024-02-20 | 江门市蓬江区凯森电子厂 | High-performance fluorescent powder composition for multi-wave peak excitation LED and device |
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| CN116751585A (en) * | 2023-06-25 | 2023-09-15 | 江苏博睿光电股份有限公司 | Fluorescent powder composition and LED device |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116751585A (en) * | 2023-06-25 | 2023-09-15 | 江苏博睿光电股份有限公司 | Fluorescent powder composition and LED device |
| CN117568035A (en) * | 2023-12-04 | 2024-02-20 | 江门市蓬江区凯森电子厂 | High-performance fluorescent powder composition for multi-wave peak excitation LED and device |
| CN117568035B (en) * | 2023-12-04 | 2024-04-16 | 江门市蓬江区凯森电子厂 | High-performance fluorescent powder composition for multi-wave peak excitation LED and device |
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