CN111403576B - Long-life high-color-rendering white light LED light source - Google Patents

Long-life high-color-rendering white light LED light source Download PDF

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CN111403576B
CN111403576B CN202010195825.9A CN202010195825A CN111403576B CN 111403576 B CN111403576 B CN 111403576B CN 202010195825 A CN202010195825 A CN 202010195825A CN 111403576 B CN111403576 B CN 111403576B
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fluorescent powder
cyan
peak wavelength
led
chip
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CN111403576A (en
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黎力
赵馥兴
管晓笙
张琳
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Beijing Yuji Xinguang Optoelectronic Technology Co ltd
Beijing Yuji Science and Technology Co Ltd
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Beijing Yuji Xinguang Optoelectronic Technology Co ltd
Beijing Yuji Science and Technology Co Ltd
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
    • H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier 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 with at least one potential-jump barrier or surface barrier 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
    • H01L33/50—Wavelength conversion elements
    • H01L33/501—Wavelength conversion elements characterised by the materials, e.g. binder
    • H01L33/502—Wavelength conversion materials
    • H01L33/504—Elements with two or more wavelength conversion materials

Abstract

The invention relates to a long ropeA white LED light source with long service life and high color rendering comprises blue LED chip (440-445 nm) and aluminate cyan Sr4Al4O25Eu (peak wavelength 480nm-500nm) phosphor, red CaAlSi (ON)3Eu (peak wavelength 630-3Al5O12Eu (peak wavelength 500nm-520nm) or yellow alpha-SiAlON: Eu (peak wavelength 570nm-590nm) fluorescent powder is mixed into white light. The invention adopts aluminate Sr with a three-dimensional tetrahedral structure4Al4O25Eu cyan phosphor, which has strong stability and replaces nitrogen oxide cyan (Ca, Sr, Ba) Si with unstable structure2N2O2Eu fluorescent powder thoroughly solves the problem of short service life while keeping high color development of R1-R15 which is all larger than 90.

Description

Long-life high-color-rendering white light LED light source
Technical Field
The invention relates to the technical field of LEDs (light emitting diodes), in particular to Sr4Al4O25A white light LED light source with long service life and high color development of Eu aluminate cyan fluorescent powder.
Background
With the development of the technology in the LED industry and the popularization of product application, the requirements on LED light sources are increasingly improved. In recent years, the color rendering index (Ra) of a high-color-rendering white LED light source composed of a blue light chip and red and green fluorescent powder can reach more than 95, and the high-color-rendering white LED light source is gradually substituted for a white LED light source composed of a blue light chip and yellow fluorescent powder (Ra is about 70). However, the color development of LED light sources is gradually increasing in professional illumination fields requiring high color reproducibility, such as photographic illumination and color detection. The LED white light source with Ra >95 and R1-R15 larger than 90 is realized at present, and the main realization modes are two types:
1. ultraviolet or near ultraviolet chips are used to excite blue, green and red phosphors to combine to form white light, which is generally called full spectrum light source in the industry.
2. The mode of using a blue chip to excite red and green phosphors and combining the red and green phosphors with a cyan phosphor having a peak wavelength around 500nm occurs after the mode 1 to form white light.
Although the mode 1 realizes that Ra is more than 95 and R1-R15 are more than 90, the mode has inherent defects of low luminous efficiency, short service life and the like due to process characteristics, and the application range is limited to a certain extent.
Mode 2 introduces cyan phosphor with a peak wavelength near 500nm based on the red and green phosphor excited by the original blue chip. Taking cold white light (5600K) as an example, the spectrum has stronger relative spectral intensity near 500 nm. As shown in fig. 1, the color rendering index of the original blue chip can reach above Ra95 when the blue and green phosphors are excited by the original blue chip, but the special color rendering indexes R9 and R12 cannot be simultaneously greater than 90 due to the spectral shape characteristics. However, the fluorescent powder which is commonly used in LED devices and can be excited by blue light and can reinforce the relative spectral intensity of 500nm only has oxynitride cyan (Ca, Sr, Ba) Si2N2O2Can be realized only by Eu fluorescent powder. After the cyan fluorescent powder with the peak wavelength of about 500nm is introduced, Ra is more than 95, and R1-R15 are more than 90 can be realized by enhancing the relative spectral intensity of the spectrum with stronger intensity of about 500 nm. However, the phosphor has poor stability of the layered structure, so that the service life of the light source is low, and the phosphor can not meet the service life requirement of the current mature LED technology.
Therefore, the invention introduces the aluminate cyan phosphor cyan Sr with the structure of three-dimensional tetrahedral structure4Al4O25Eu is used to replace nitrogen oxide fluorescent powder with unstable structural performance. The service life of the LED white light source is thoroughly solved while Ra is more than 95 and R1-R15 are more than 90 white light spectrums are realized.
Disclosure of Invention
The invention aims to introduce aluminate cyan fluorescent powder with a three-dimensional tetrahedral structure into the existing white LED light source which uses oxynitride cyan fluorescent powder to realize Ra >95 and R1-R15 is more than 90 to replace oxynitride cyan fluorescent powder; the service life problem caused by the inherent structural characteristics of the oxynitride cyan fluorescent powder is thoroughly solved while the high color rendering index Ra >95 is maintained and all the R1-R15 are more than 90.
In order to achieve the purpose, the white light LED light source provided by the invention comprises an LED bracket, a blue light LED chip and mixed fluorescent powder glue. The light emitted by the blue LED chip is used for exciting the fluorescent powder layer on the surface of the blue LED chip to generate cyan, red and green light or cyan, red and yellow mixed white light. The LED chip is fixed on the LED support, the electrode is communicated, fluorescent powder colloid with cyan, red and green or cyan, red and yellow mixture is coated on the surface of the LED chip in a coating or dispensing mode, and blue light is utilized to excite the fluorescent powder to mix colors to form white light.
Aluminate cyan Sr used in the invention4Al4O25The Eu phosphor has a wide excitation band (as shown in FIG. 2), and the optimal excitation wavelength is in the ultraviolet band, and the excitation effect is limited in the blue band, so that aluminate cyan Sr4Al4O25Eu phosphors are used only in UV excited devices. Based on the requirement of the invention on the excitation effect, the blue light chip is adopted to excite the aluminate cyan Sr4Al4O25Eu fluorescent powder reinforces the relative spectral intensity of 500nm, realizes the Ra of more than 95, the R1-R15 is more than 90 white light spectrum, and the best effect can be achieved by adopting the blue light chip with the peak wavelength of 440-445 nm.
The utility model provides a white light LED light source of high color rendering of long-life, includes the mixed phosphor powder that covers on LED chip and the chip, its characterized in that: wherein the LED chip is a blue chip; the mixed fluorescent powder comprises cyan fluorescent powder, red fluorescent powder and yellow fluorescent powder, or cyan fluorescent powder, red fluorescent powder and green fluorescent powder; the cyan fluorescent powder is aluminate cyan fluorescent powder.
The light-emitting peak wavelength of the LED chip is as follows: 440-445 nm.
The aluminate cyan fluorescent powder: sr4Al4O25Eu, with peak wavelength of 480nm-500 nm.
The mixed fluorescent powder comprises cyan fluorescent powder, red fluorescent powder and yellow fluorescent powder, wherein the red fluorescent powder: CaAlSi (ON)3Eu, peak wavelength 630-: eu, peak wavelength 570nm-590nm。
The mixed fluorescent powder comprises cyan fluorescent powder, red fluorescent powder and green fluorescent powder, wherein the red fluorescent powder: CaAlSi (ON)3Eu, peak wavelength 630-: lu (Lu)3Al5O12Eu, peak wavelength 500nm-520 nm.
The packaging form of the white light LED light source is a surface mounted lamp bead, an LED module or an LED filament lamp.
The invention relates to a white light LED light source with long service life and high color rendering, which is formed by matching a blue LED chip (440nm-445nm) with aluminate cyan Sr4Al4O25Eu (peak wavelength 480nm-500nm) phosphor, red CaAlSi (ON)3Eu (peak wavelength 630-3Al5O12Eu (peak wavelength 500nm-520nm) or yellow alpha-SiAlON: Eu (peak wavelength 570nm-590nm) fluorescent powder is mixed into white light. The light source can obtain high color rendering index (Ra)>95, all of the components from R1 to R15 are more than 90), and the relative spectral intensity around 500nm in the spectrum after the cyan fluorescent powder is added has stronger, so that all of the components from R1 to R15 are more than 90. The invention overcomes the defect that the prior art must use oxynitride cyan (Ca, Sr, Ba) Si2N2O2Eu fluorescent powder can supplement relative spectral intensity near 500nm, but the cyan fluorescent powder has a layered structure and poor stability, so that the service life of the light source is low and the service life of the light source is far from the service life requirement of the current mature LED technology. Aluminate Sr used in the invention4Al4O25Eu cyan phosphor has a three-dimensional tetrahedral structure, has high stability, and replaces an unstable structure of an oxynitride cyan (Ca, Sr, Ba) Si2N2O2Eu fluorescent powder thoroughly solves the problem of service life while keeping high color development of R1-R15 which is all larger than 90.
The invention has the advantages that:
1. the invention relates to a white light LED light source with high color rendering index, because the peak wavelength of the used chip is 440-445nm, most of the light generated by the LED chip is used for exciting fluorescent powder, and the high color rendering index (Ra >95, and all from R1-R15 are more than 90) can be obtained.
2. The white light LED light source manufactured by the invention introduces aluminate cyan Sr with a three-dimensional tetrahedral structure4Al4O25Eu phosphor to replace nitrogen oxide cyan (Ca, Sr, Ba) Si with unstable structural performance2N2O2Eu fluorescent powder thoroughly solves the service life problem of the LED white light source.
3. The white light LED light source manufactured by the invention introduces aluminate cyan Sr with a three-dimensional tetrahedral structure4Al4O25Eu phosphor to replace nitrogen oxide cyan (Ca, Sr, Ba) Si with unstable structural performance2N2O2The light effect of the Eu fluorescent powder is not affected, and the Eu fluorescent powder is equivalent to the Eu fluorescent powder using oxynitride cyan fluorescent powder.
4. The white light LED light source manufactured by the invention has two matching modes which are both suitable for the mature LED packaging process, and the yield of batch production is not influenced.
5. The white light LED light source manufactured by the invention can realize the arbitrary color temperature of 2700-. Is especially suitable for high color temperature above 5000K.
Drawings
FIG. 1 is a comparison of a typical spectrum of generally high color development (Ra >95, not all greater than 90 for R1-R15) at a color temperature of 5600K, with a spectrum of Ra >95 for intensity around 500nm of reinforcement, and greater than 90 for all of R1-R15.
FIG. 2 shows aluminate cyan Sr adopted by the present invention4Al4O25Excitation and emission spectra of Eu (peak wavelength 490nm) phosphor.
Fig. 3 is a schematic structural view of a patch LED lamp bead in embodiments 1 and 2 of the present invention.
Fig. 4 shows that the test report color temperature of example 1 of the present invention is 5600K.
FIG. 5 is a comparison of the aging test conducted at the same time for high temperature and high humidity (ambient temperature 85 deg.C, humidity 85%) in example 1 of the present invention and a white LED sample (chip and holder identical) using oxynitride cyan phosphor.
FIG. 6 shows that the color temperature of the test report of embodiment 2 of the present invention is 6500K
FIG. 7 is a comparison of the aging test conducted at the same time for high temperature and high humidity (ambient temperature 85 deg.C, humidity 85%) in example 2 of the present invention and a white LED sample (chip and holder identical) using oxynitride cyan phosphor.
Detailed Description
The present invention will be described in further detail below by way of examples with reference to the accompanying drawings.
The chips and phosphors used below are all commercially available products.
Example 1
As shown in fig. 3, the white light patch LED lamp bead of the present embodiment includes an LED chip 1, two electrodes 2 and an LED support 3, where the two electrodes are respectively disposed at two ends of the LED support 3 and are used for leading out the positive electrode and the negative electrode of the LED chip 1.
First, a chip 1 (in this embodiment, a chip with a peak wavelength of 440 nm) is fixed on the LED support 3, and two ends of the chip are connected to two electrode plates at the bottom of the substrate through gold wires respectively so as to be conducted with the two electrodes 2.
Then, the fluorescent powder containing three colors of cyan, red and yellow is prepared according to a certain proportion. This example uses an aluminate cyan phosphor: sr4Al4O25: eu (peak wavelength 490nm), red phosphor: CaAlSi (ON)3: eu (peak wavelength 650nm), yellow phosphor: α -SiAlON: eu (peak wavelength 580nm), stirring uniformly, and defoaming in vacuum.
Furthermore, the mixed colloid is uniformly coated above the LED chip, and the coating thickness is reasonably set, so that good light color uniformity is ensured, and the LED keeps high light emitting efficiency.
Fig. 4 shows that the color temperature reported by the test of this embodiment is 5600K.
Color parameters:
chromaticity coordinates: x 0.3262 y 0.3427 u 0.2020 v 0.4775 duv 3.657e 003 g
Correlated color temperature: tc — 5775K dominant wavelength: λ d ═ 510.3nm color purity: 2.2 percent of Purity
Color ratio: r17.6% G76.7% B5.7% peak wavelength: λ p ═ 440.6nm half-width: Δ λ d ═ 21.3nm
Color rendering index: ra 96.9
R1＝100 R2＝98 R3＝96 R4＝93 R5＝97 R6＝98 R7＝96
R8＝97 R9＝96 R10＝97 R11＝91 R12＝95 R13＝99 R14＝98 R15＝98
It can be seen from the spectrogram that the relative spectral intensity is strong near 500nm, and the Ra of the embodiment is more than 95 and is all more than 90 from R1 to R15 by calculating the color rendering index.
FIG. 5 shows the color temperature of this example with the same color temperature using the oxynitride cyan (Ca, Sr, Ba) Si2N2O2: the white light LED sample (the chip is the same as the bracket) of the Eu fluorescent powder (the peak wavelength is 500nm) is subjected to high-temperature and high-humidity (the environmental temperature is 85 ℃ and the humidity is 85%) aging test comparison at the same time, and it can be obviously seen that the luminous flux maintenance rate of the embodiment is superior to that of the sample adopting the oxynitride cyan fluorescent powder.
Example 2
As shown in fig. 3, the white light patch LED lamp bead of the present embodiment includes an LED chip 1, two electrodes 2 and an LED support 3, where the two electrodes are respectively disposed at two ends of the LED support 3 and are used for leading out the positive electrode and the negative electrode of the LED chip 1.
First, a chip 1 (in this embodiment, a chip with a peak wavelength of 440 nm) is fixed on the LED support 3, and two ends of the chip are connected to two electrode plates at the bottom of the substrate through gold wires respectively so as to be conducted with the two electrodes 2.
Then, the fluorescent powder containing three colors of cyan, red and green is prepared according to a certain proportion. This example uses an aluminate cyan phosphor: sr4Al4O25: eu (peak wavelength 490nm), red phosphor: CaAlSi (ON)3: eu (peak wavelength 650nm), green phosphor: lu (Lu)3Al5O12: eu (peak wavelength 510nm), stirring uniformly, and defoaming in vacuum.
Furthermore, the mixed colloid is uniformly coated above the LED chip, and the coating thickness is reasonably set, so that good light color uniformity is ensured, and the LED keeps high light emitting efficiency.
FIG. 6 shows the reported color temperature of 6500K for this example.
Color parameters:
chromaticity coordinates: x is 0.3162 y 0.3286/u' 0.2004 v 0.4687 duv 1.238e 003
Correlated color temperature: tc 6317K dominant wavelength: λ d-488.1 nm color purity: purity 6.1%
Color ratio: r17.5% G76.2% B6.3% peak wavelength: λ p-445.2 nm half width: Δ λ d 25.1nm
Color rendering index: ra 97.3
R1＝97 R2＝99 R3＝99 R4＝94 R5＝97 R6＝97 R7＝98
R8＝98 R9＝93 R10＝97 R11＝90 R12＝91 R13＝97 R14＝99 R15＝99
It can be seen from the spectrogram that the relative spectral intensity is strong near 500nm, and the Ra of the embodiment is more than 95 and is all more than 90 from R1 to R15 by calculating the color rendering index.
FIG. 7 shows the color temperature of this example with the same color temperature using the oxynitride cyan (Ca, Sr, Ba) Si2N2O2: the white light LED sample (the chip is the same as the bracket) of the Eu fluorescent powder (the peak wavelength is 500nm) is subjected to high-temperature and high-humidity (the environmental temperature is 85 ℃ and the humidity is 85%) aging test comparison at the same time, and it can be obviously seen that the luminous flux maintenance rate of the embodiment is superior to that of the sample adopting the oxynitride cyan fluorescent powder.
The foregoing is a more detailed description of the invention, taken in conjunction with the accompanying detailed description, and it is not intended to limit the invention to the particular forms disclosed, but on the contrary, the intention is to cover all modifications, equivalents, and alternatives falling within the spirit and scope of the invention.

Claims (2)

1. The utility model provides a white light LED light source of high color rendering of long-life, includes the mixed phosphor powder that covers on LED chip and the chip, its characterized in that: wherein the LED chip is a blue chip; the mixed fluorescent powder comprises cyan fluorescent powder, red fluorescent powder and yellow fluorescent powder, or cyan fluorescent powder, red fluorescent powder and green fluorescent powder; the cyan fluorescent powder is aluminate cyan fluorescent powder Sr4Al4O25Eu, whose peak wavelength is 480nm-500nm；
The light-emitting peak wavelength of the LED chip is as follows: 440-445 nm;
the mixed fluorescent powder comprises cyan fluorescent powder, red fluorescent powder and yellow fluorescent powder, wherein the red fluorescent powder: CaAlSi (ON)3Eu, peak wavelength 630-: eu, the peak wavelength of which is 570nm-590 nm; or
The mixed fluorescent powder comprises cyan fluorescent powder, red fluorescent powder and green fluorescent powder, wherein the red fluorescent powder: CaAlSi (ON)3Eu, peak wavelength 630-: lu (Lu)3Al5O12Eu, peak wavelength 500nm-520 nm.
2. The white light LED light source of claim 1, in the form of a chip lamp bead, an LED module, or an LED filament lamp.
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Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101806430A (en) * 2009-02-17 2010-08-18 福建省苍乐电子企业有限公司 High-color rendering white-light LED
CN105762144A (en) * 2016-05-24 2016-07-13 杜军 Full-spectrum high-color-rendering LED white light emitting device and manufacturing method thereof
CN107565006A (en) * 2017-08-30 2018-01-09 合肥工业大学 A kind of LED light source and light fixture with daylight visible light part spectral composition
CN109671836A (en) * 2017-10-13 2019-04-23 易美芯光（北京）科技有限公司 A kind of adjustable aobvious implementation method for referring to brightness-adjustable white light LEDs of adjustable color temperature
WO2019180959A1 (en) * 2018-03-23 2019-09-26 サンケン電気株式会社 Light emitting device and lighting fixture

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101806430A (en) * 2009-02-17 2010-08-18 福建省苍乐电子企业有限公司 High-color rendering white-light LED
CN105762144A (en) * 2016-05-24 2016-07-13 杜军 Full-spectrum high-color-rendering LED white light emitting device and manufacturing method thereof
CN107565006A (en) * 2017-08-30 2018-01-09 合肥工业大学 A kind of LED light source and light fixture with daylight visible light part spectral composition
CN109671836A (en) * 2017-10-13 2019-04-23 易美芯光（北京）科技有限公司 A kind of adjustable aobvious implementation method for referring to brightness-adjustable white light LEDs of adjustable color temperature
WO2019180959A1 (en) * 2018-03-23 2019-09-26 サンケン電気株式会社 Light emitting device and lighting fixture

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