CN116825932A - LED device - Google Patents
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- CN116825932A CN116825932A CN202310753518.1A CN202310753518A CN116825932A CN 116825932 A CN116825932 A CN 116825932A CN 202310753518 A CN202310753518 A CN 202310753518A CN 116825932 A CN116825932 A CN 116825932A
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- 239000000843 powder Substances 0.000 claims abstract description 92
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- 239000000126 substance Substances 0.000 claims description 32
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- 102100032047 Alsin Human genes 0.000 claims description 12
- 101710187109 Alsin Proteins 0.000 claims description 12
- 229910052788 barium Inorganic materials 0.000 claims description 11
- 239000008393 encapsulating agent Substances 0.000 claims description 3
- 229910052733 gallium Inorganic materials 0.000 claims description 3
- 229910052727 yttrium Inorganic materials 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 14
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- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- CSDREXVUYHZDNP-UHFFFAOYSA-N alumanylidynesilicon Chemical compound [Al].[Si] CSDREXVUYHZDNP-UHFFFAOYSA-N 0.000 description 2
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- 229910052684 Cerium Inorganic materials 0.000 description 1
- 229910052693 Europium Inorganic materials 0.000 description 1
- 229910004283 SiO 4 Inorganic materials 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000009471 action Effects 0.000 description 1
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Abstract
The invention relates to an LED device, which comprises an LED chip and a fluorescent powder composition, wherein the fluorescent powder composition comprises the following components in percentage by mass: 3-30% of blue-green fluorescent powder; 35-70% of green fluorescent powder; 10-50% of white fluorescent powder; 3-15% of red fluorescent powder; the LED chip comprises a first chip unit and a second chip unit, wherein the light-emitting peak wavelength range of the first chip unit is 447.5nm-455nm, and the light-emitting peak wavelength range of the second chip unit is 395nm-410nm; the fluorescent powder composition can provide high color rendering index and full spectrum luminous effect, has higher color rendering index under the excitation of a dual-band chip combined by a blue light LED and a purple light LED, and meets 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 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, a dual-band chip formed by combining a blue light LED and a purple light LED exists, and the color rendering index of the fluorescent powder after the fluorescent powder is excited by using the device in the prior art does not reach the optimal level, so that the use requirement of the special field with high requirements on the color parameters can not be met.
Disclosure of Invention
The embodiment of the invention provides an LED device which can provide high color rendering index and full spectrum luminous effect. The technical scheme is as follows:
an LED device comprising an LED chip and a phosphor composition;
the fluorescent powder composition comprises the following components in percentage by mass: 3-30% of blue-green fluorescent powder; 35-70% of green fluorescent powder; 10-50% of white fluorescent powder; 3-15% of red fluorescent powder;
the LED chip comprises a first chip unit and a second chip unit, wherein the light-emitting peak wavelength range of the first chip unit is 447.5nm-455nm, and the light-emitting peak wavelength range of the second chip unit is 395nm-410nm;
wherein, the light-emitting peak wavelength range of the blue-green fluorescent powder is 480nm-500nm; the light-emitting peak wavelength range of the green fluorescent powder is 520nm-540nm; the light-emitting peak wavelength range of the white fluorescent powder is 440nm-460nm; the light-emitting peak wavelength range of the red fluorescent powder is 650nm-670nm.
Preferably, the white phosphor includes at least one of substances having the formula I,
X 1 2-x (PO 4 ) 3 Cl:xEu 2+ chemical formula I
In the chemical formula I, the X 1 At least one selected from Ba and Sr, and the value range of x is more than or equal to 0.001 and less than or equal to 0.5.
Preferably, the value of x in the chemical formula I is in the range of 0.01-0.025.
Preferably, the green phosphor includes at least one of substances having the formula II,
X 2 3-y Al 5 O 12 :yCe 3+ formula II
In the chemical formula II, the X 2 At least one of Y, lu and Ga, wherein Y is more than or equal to 0.001 and less than or equal to 0.5.
Preferably, the ratio of x in formula I to y in formula II is 1 (1.8-2.2).
Preferably, the blue-green phosphor includes at least one of substances having a chemical formula III,
X 3 1-z Si 2 O 2 N 2 :zEu 2+ formula III
In the formula III, the X 3 At least one selected from Ba, ca and Sr, and z is more than or equal to 0.001 and less than or equal to 0.5.
Preferably, 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, wherein the value range of m is more than or equal to 0.001 and less than or equal to 0.5.
Preferably, the light-emitting peak wavelength range of the first chip unit is 447.5nm-452.5nm, and the light-emitting peak wavelength range of the second chip unit is 400nm-410nm.
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 (1.1-2.5).
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-6000K.
According to the fluorescent powder composition and the LED device, the relation between component substances and component contents in the fluorescent powder composition is improved, so that the fluorescent powder composition has a wider light-emitting color range after being excited by a dual-band chip combined by a blue light LED and a purple light LED, and a full-spectrum light-emitting effect can be realized; in the aspect of color rendering index, the color rendering index is higher, 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 emission spectrum of the LED device of embodiment 3 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 light-emitting effect of the fluorescent powder collocation scheme after being excited by the dual-band chip combined by the blue light LED and the purple light LED is difficult to reach the optimal level, and the requirements of the special field on high color rendering index and full spectrum cannot be met.
To this end, an embodiment of the present invention proposes an LED device comprising an LED chip and a phosphor composition comprising the following components in mass percent: 3-30% of blue-green fluorescent powder; 35-70% of green fluorescent powder; 10-50% of white fluorescent powder; 3-15% of red fluorescent powder;
the LED chip comprises a first chip unit and a second chip unit, wherein the light-emitting peak wavelength range of the first chip unit is 447.5nm-455nm, and the light-emitting peak wavelength range of the second chip unit is 395nm-410nm;
wherein, the light-emitting peak wavelength range of the blue-green fluorescent powder is 480nm-500nm; the light-emitting peak wavelength range of the green fluorescent powder is 520nm-540nm; the light-emitting peak wavelength range of the white fluorescent powder is 440nm-460nm; the light-emitting peak wavelength range of the red fluorescent powder is 650nm-670nm.
The above-mentioned blue-green phosphor, white phosphor, green 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, the peak wavelength of which is typically in the range of 480-500 nm. The white fluorescent powder does not mean that the fluorescent powder emits white light, but can emit light with multiple wavelengths under the action of an excitation light source, and the white fluorescent powder is mixed to generate compound light which is close to the white light. In the above-mentioned phosphor combinations, the emission peak wavelength of the white phosphor is in the range of 440 to 460nm (blue region), which means that the emission intensity thereof is highest in this band only.
In the embodiment of the invention, the LED chip comprises a first chip unit and a second chip unit, wherein the light-emitting peak wavelength range of the first chip unit is 447.5nm-455nm, and the light-emitting peak wavelength range of the second chip unit is 395nm-410nm. Namely, the LED device adopts a dual-band LED chip formed by combining a blue LED and a purple LED as an excitation light source. The dual-band LED chip is used as an excitation light source to more fully excite the fluorescent powder to emit light with full spectrum, so that the light emitting effect is improved. In the embodiment of the invention, through the mutual synergistic effect among the blue-green fluorescent powder, the white fluorescent powder and the red fluorescent powder, the spectrum which is as wide as possible can be obtained from the dual-band excitation of blue light and purple light, and the richness of color rendering and the flexibility of color temperature regulation are increased, so that white light which is closer to natural light is realized.
In some specific embodiments, to ensure that the phosphor composition achieves optimal light emission, the LED chip may be selected from a blue LED chip having a light emission peak wavelength in the range of 447.5nm to 452.5nm and a violet LED chip having a light emission peak wavelength in the range of 400nm to 410nm.
In some specific embodiments, the white phosphor is a divalent europium-doped alkaline earth metal chlorophosphate comprising at least one of the substances represented by formula I,
X 1 2-x (PO 4 ) 3 Cl:xEu 2+ chemical formula I
In the chemical formula I, the X 1 At least one selected from Ba 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 white phosphor may be (Ba, sr) 1.95 (PO 4 ) 3 Cl:xEu 2+ . In an embodiment of the present invention, (Ba, sr) 1.95 The positions of Ba and Sr in the chemical structure can be interchanged, and the Ba and Sr can exist in any proportion, and the Ba and Sr can be only needed to have the total molar ratio equal to 1.95 (2-x), and the following similar chemical formulas are the same and are not repeated.
In some specific embodiments, x in the formula I ranges from 0.01.ltoreq.x.ltoreq.0.025.
Specifically, the doping concentration of rare earth ions has an important influence on the luminescence performance of the fluorescent powder, and the quantum efficiency, namely the luminescence efficiency, of the fluorescent powder can be improved by the proper ion doping concentration. 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.
In some specific embodiments, the green phosphor is a trivalent cerium doped garnet compound comprising at least one of the species of formula II,
X 2 3-y Al 5 O 12 :yCe 3+ formula II
In the chemical formula II, the X 2 At least one of Y, lu and Ga, wherein Y is more than or equal to 0.001 and less than or equal to 0.5.
In some specific embodiments, the ratio between x in formula I and y in formula II is 1 (1.8-2.2).
Under the proportion, the white fluorescent powder and the green fluorescent powder can better cooperate, and the luminous efficiency and the color rendering property of the fluorescent powder composition are optimized by precisely controlling the proportion relation of the doping concentration of the rare earth ions in different fluorescent powders.
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 III,
X 3 1-z Si 2 O 2 N 2 :zEu 2+ formula III
In the formula III, the X 3 At least one selected from Ba, ca and Sr, and 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 of Sr and Ca, wherein the value range of 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,Sr) 2-x (PO 4 ) 3 Cl:xEu 2+ 10-50％；(Y,Lu,Ga) 3-y Al 5 O 12 :yCe 3+ 35-70％；
(Ba,Ca,Sr) 1-z Si 2 O 2 N 2 :zEu 2+ 3-30％；(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,Sr) 2-x (PO 4 ) 3 Cl:xEu 2+ 20-50％；(Y,Lu,Ga) 3-y Al 5 O 12 :yCe 3+ 35-50％；
(Ba,Ca,Sr) 1-z Si 2 O 2 N 2 :zEu 2+ 3-20％；(Sr,Ca) 1-m AlSiN 3 :mEu 2+ 5-10％。
in the embodiment of the invention, europium-doped alkaline earth metal silicon oxynitride, cerium-doped garnet compound, europium-doped alkaline earth metal chlorophosphate and alkaline earth metal silicon aluminum nitride are adopted as fluorescent powder, and the compounds have good chemical stability and physical stability, can effectively improve the thermal stability and the optical stability of the fluorescent powder, and prolong the service life of the fluorescent powder. The europium-doped alkaline earth metal chlorophosphate has high luminous efficiency. The self luminous wavelength is 440-460nm and is in the blue region of the visible spectrum, blue light emitted by the LED chip can be effectively converted, the width of the whole spectrum is increased, and the high-efficiency and full-spectrum luminous effect can be realized. Structurally, europium-doped alkaline earth chlorophosphate phosphors and cerium-doped garnet compounds exhibit good spectral matching, which can form a synergistic effect that improves overall spectral uniformity and continuity during spectral superposition and light energy conversion. According to the embodiment of the invention, through improving the relation between component substances and component contents in the fluorescent powder composition, the full spectrum luminous effect is realized after the dual-band chip combined by the blue light LED and the purple light LED is excited, meanwhile, the high color rendering performance that the color rendering index Ra is more than or equal to 98 and the R1-R15 is more than or equal to 93 can be achieved, and the R12 index is higher, so that the high requirement of the special field is met.
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, a holder 2, an LED chip 3, and a bond wire 4. The LED chip 3 consists of two electroluminescent semiconductor material chips, and emits blue light and purple light respectively; the LED chip 3 is fixed on the bracket 2 and connected to the circuit board through a bond alloy wire 4. The LED chip 3 is a dual-band LED chip formed by combining a blue LED and a purple LED, and when the LED chip is electrified, the LED chip emits blue light and purple light at the same time, and the combination of the blue light and the purple light excites the fluorescent powder mixture to emit light so as to form the 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 (1.1-2.5), 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-6000K and is beneficial to realizing wider application scenes.
The LED device adopts the fluorescent powder composition, under the excitation of the double-band LED chip combined by the blue light LED and the purple light LED, the color rendering performance and the spectral coverage breadth can be effectively improved, the full spectral range is covered by the luminescence, the color rendering index Ra is more than or equal to 98, the R1-R15 is more than or equal to 93, and the fluorescent powder composition has a higher R12 index, can realize excellent luminescence performance and stability, and meets diversified illumination 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 dual-band LED chip with a peak wavelength range of 447.5nm-452.5nm and a combination of 400nm-410nm ultraviolet LEDs 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 1:2.44 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) 5% and its emission peak wavelength is 493nm;
Lu 2.96 Al 5 O 12 :0.04Ce 3+ (green phosphor) 44% having a light emission peak wavelength of 530nm;
(Ba,Sr) 1.98 (PO 4 ) 3 Cl:0.02Eu 2+ (white phosphor) 44% having a light emission peak wavelength of 451nm;
(Sr,Ca) 0.98 AlSiN 3 :0.02Eu 2+ (red phosphor) 7%, 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 1:1.7.
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)Color phosphor) 18% having a light emission peak wavelength of 493nm;
Lu 2.96 Al 5 O 12 :0.04Ce 3+ (green phosphor) 47% having a light emission peak wavelength of 530nm;
(Ba,Sr) 1.98 (PO 4 ) 3 Cl:0.02Eu 2+ (white phosphor) 26% having a light emission peak wavelength of 451nm;
(Sr,Ca) 0.98 AlSiN 3 :0.02Eu 2+ (red phosphor) 9%, the emission peak wavelength of which 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 1:1.2.
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) 14% having a light emission peak wavelength of 493nm;
Lu 2.96 Al 5 O 12 :0.04Ce 3+ (green phosphor) 40% having a light emission peak wavelength of 530nm;
(Ba,Sr) 1.98 (PO 4 ) 3 Cl:0.02Eu 2+ (white phosphor) 40% having a light emission peak wavelength of 451nm;
(Sr,Ca) 0.98 AlSiN 3 :0.02Eu 2+ (red phosphor) 6%, the emission peak wavelength of which was 660nm.
Embodiment 4 provides an LED device, which differs from embodiment 1 in that: the doping concentration of rare earth ions of each component in the fluorescent powder composition is different; 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) 5% and its emission peak wavelength is 493nm;
Lu 2.96 Al 5 O 12 :0.04Ce 3+ (Green phosphor) 44%The light-emitting peak wavelength is 530nm;
(Ba,Sr) 1.99 (PO 4 ) 3 Cl:0.01Eu 2+ (white phosphor) 44% having a light emission peak wavelength of 451nm;
(Sr,Ca) 0.98 AlSiN 3 :0.02Eu 2+ (red phosphor) 7%, and the emission peak wavelength was 660nm.
Embodiment 5 provides an LED device, which differs from embodiment 1 in that: the doping concentration of rare earth ions of each component in the fluorescent powder composition is different; the phosphor composition in example 5 comprises the following components in percentage by mass:
Ca 0.99 Si 2 O 2 N 2 :0.01Eu 2+ (blue-green phosphor) 5% and its emission peak wavelength is 493nm;
Lu 2.98 Al 5 O 12 :0.02Ce 3+ (green phosphor) 44% having a light emission peak wavelength of 530nm;
(Ba,Sr) 1.99 (PO 4 ) 3 Cl:0.01Eu 2+ (white phosphor) 44% having a light emission peak wavelength of 451nm;
(Sr,Ca) 0.98 AlSiN 3 :0.02Eu 2+ (red phosphor) 7%, and the emission peak wavelength was 660nm.
Embodiment 6 provides an LED device, which is different from embodiment 1 in that: the substances of the green fluorescent powder in the fluorescent powder composition are different; the phosphor composition in example 6 comprises the following components in percentage by mass:
Ca 0.99 Si 2 O 2 N 2 :0.01Eu 2+ (blue-green phosphor) 5% and its emission peak wavelength is 493nm;
Sr 1.96 SiO 4 :0.04Eu 3+ (green phosphor) 44% having a light emission peak wavelength of 530nm;
(Ba,Sr) 1.98 (PO 4 ) 3 Cl:0.02Eu 2+ (white phosphor) 44% having a light emission peak wavelength of 451nm;
(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 1 in that: the phosphor compositions differ in component content (do not contain white 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) 30% and a light emission peak wavelength of 493nm;
Lu 2.96 Al 5 O 12 :0.04Ce 3+ (green phosphor) 60% with a light emission peak wavelength of 530nm;
(Sr,Ca) 0.98 AlSiN 3 :0.02Eu 2+ (red phosphor) 10%, the emission peak wavelength of which was 660nm.
Experimental example
The emission spectra of the LED devices of examples 1-3 and comparative example 1 were tested using a remote HAAS2000 photoelectric integrating sphere device, and the results are shown in fig. 2-4; the LED devices of examples 1-6 and comparative example 1 were tested for light color parameters using a remote HAAS2000 optoelectric integrating sphere device, the results of which are shown in table 1 below.
Table 1 examples 1-6 and comparative example 1 light color parameter tables
As can be seen from fig. 2-4 and table 1, embodiments 1-3 sequentially provide LED devices with color temperatures of 5000K, 4000K, 3000K, and about, 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 4, the luminous intensities of the embodiments 1 to 3 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 1-3 in comparison with comparative example 1, the phosphor compositions in examples 1-3 contained white phosphor, whereas the phosphor composition in comparative example 1 did not contain white phosphor. As is clear from Table 1, the color development effect of the LED devices of examples 1 to 3 is higher than that of comparative example 1, ra of examples 1 to 3 is 98 or more, and R1 to R15 are 93 or more; the color rendering index of the LED device of example 1 is significantly higher than that of comparative example 1, especially at about 5000K at the same color temperature. This shows that the white fluorescent powder is introduced into the fluorescent powder composition to generate synergistic effect with the blue-green fluorescent powder, the green fluorescent powder and the red fluorescent powder, so that the color rendering property of the LED device is effectively improved, the LED device has extremely high color rendering index and extremely good color reducing capability.
Example 1 differs from example 6 in that the green phosphor used in example 6 is a trivalent europium-doped alkaline earth metal silicate. As can be seen from table 1, the color development effect of the LED device of example 1 is significantly higher than that of example 6. Test results show that the white fluorescent powder (europium-doped alkaline earth metal chlorophosphate fluorescent powder) and the green fluorescent powder (cerium-doped garnet compound) have good spectrum matching performance, and under the synergistic effect, the luminous effect of the fluorescent powder can be effectively improved, and the color rendering performance of the LED device is enhanced.
The components and proportions of the fluorescent powder compositions in the embodiment 1, the embodiment 4 and the embodiment 5 are the same, and the color temperature of the LED device is about 5000K. The doping concentration proportion relation of rare earth ions between fluorescent powder components in the embodiment 1 and the embodiment 5 is x:y=1:2, and the doping concentration proportion relation of the rare earth ions provided by the invention is satisfied, namely x:y=1 is satisfied (1.8-2.2); whereas example 4 does not satisfy this doping concentration ratio relationship.
As can be seen from table 1, the LED device of example 1 has a higher color development effect than that of example 4, as compared with example 4; embodiment 4 compared with embodiment 5, the LED device of embodiment 4 has a lower color rendering effect than embodiment 5; compared with example 5, example 1 showed no significant difference in the color development effect of the LED devices. Test results show that under the condition of meeting the doping concentration proportion relation of the rare earth ions provided by the invention, the fluorescent powder composition containing white fluorescent powder and green fluorescent powder provided by the invention can generate an optimal synergistic effect, so that the color development performance of the LED device can reach an optimal state.
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. An LED device comprising an LED chip and a phosphor composition;
the fluorescent powder composition comprises the following components in percentage by mass: 3-30% of blue-green fluorescent powder; 35-70% of green fluorescent powder; 10-50% of white fluorescent powder; 3-15% of red fluorescent powder;
the LED chip comprises a first chip unit and a second chip unit, wherein the light-emitting peak wavelength range of the first chip unit is 447.5nm-455nm, and the light-emitting peak wavelength range of the second chip unit is 395nm-410nm;
wherein, the light-emitting peak wavelength range of the blue-green fluorescent powder is 480nm-500nm; the light-emitting peak wavelength range of the green fluorescent powder is 520nm-540nm; the light-emitting peak wavelength range of the white fluorescent powder is 440nm-460nm; the light-emitting peak wavelength range of the red fluorescent powder is 650nm-670nm.
2. The LED device of claim 1, wherein the white phosphor comprises at least one of the substances of formula I,
X 1 2-x (PO 4 ) 3 Cl:xEu 2+ chemical formula I
In the chemical formula I, the X 1 At least one selected from Ba and Sr, and the value range of x is more than or equal to 0.001 and less than or equal to 0.5.
3. The LED device of claim 2, wherein x in formula I has a value in the range of 0.01 ∈x ∈0.025.
4. The LED device of claim 3, wherein the green phosphor comprises at least one of the substances of formula II,
X 2 3-y Al 5 O 12 :yCe 3+ formula II
In the chemical formula II, the X 2 At least one of Y, lu and Ga, wherein Y is more than or equal to 0.001 and less than or equal to 0.5.
5. The LED device of claim 4, wherein the ratio between x in formula I and y in formula II is 1 (1.8-2.2).
6. The LED device of claim 1, wherein the blue-green phosphor comprises at least one of the substances of formula III,
X 3 1-z Si 2 O 2 N 2 :zEu 2+ formula III
In the formula III, the X 3 At least one selected from Ba, ca and Sr, and z is more than or equal to 0.001 and less than or equal to 0.5.
7. The LED device of claim 1, wherein the red phosphor comprises at least one of the substances of 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, wherein the value range of m is more than or equal to 0.001 and less than or equal to 0.5.
8. The LED device of claim 1, wherein the first chip unit has a light emission peak wavelength range of 447.5nm-452.5nm and the second chip unit has a light emission peak wavelength range of 400nm-410nm.
9. The LED device of claim 1, further comprising an LED encapsulant, wherein the phosphor composition and the LED encapsulant are mixed in a mass ratio of 1 (1.1-2.5).
10. The LED device of claim 1, 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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