Source: https://patents.google.com/patent/US9392670B2/en
Timestamp: 2018-08-16 22:46:57
Document Index: 444594968

Matched Legal Cases: ['Application No. 200810084540', 'application No. 201010180341', 'application No. 200810084540', 'Application No. 201010180341', 'Application No. 08250974', 'application No. 097113754', 'Application No. 201010180341', 'Application No. 2008', 'Application No. 08250974', 'Application No. 1157877', 'Application No. 2008', 'Application No. 2007', 'Application No. 200810084540', 'Application No. 096146012']

US9392670B2 - White light emitting device and white light source module using the same - Google Patents
US9392670B2
US9392670B2 US13661346 US201213661346A US9392670B2 US 9392670 B2 US9392670 B2 US 9392670B2 US 13661346 US13661346 US 13661346 US 201213661346 A US201213661346 A US 201213661346A US 9392670 B2 US9392670 B2 US 9392670B2
US13661346
US20130258211A1 (en )
This application is a continuation of U.S. patent application Ser. No. 13/097,419, filed on Apr. 29, 2011, which is a continuation of U.S. patent application Ser. No. 12/081,726, filed on Apr. 21, 2008, which is a divisional of U.S. patent application Ser. No. 11/987,830, filed on Dec. 5, 2007, and claims priority from Korean Patent Application Nos. 2006-122631, filed on Dec. 5, 2006, and 2007-12112, filed on Feb. 6, 2007, in the Korean Intellectual Property Office. The entire disclosures of the prior applications are hereby incorporated by reference in their entirety.
The blue LED chip may have a full width at half-maximum (FWHM) of 10 to 30 nm, the green phosphor may have a FWHM of 30 to 100 nm and the red phosphor may have a FWHM of 50 to 200 nm. The red phosphor may include at least one of CaAlSiN3:Eu and (Ca,Sr)S:Eu. The green phosphor may include at least one of A2SiO4:Eu, SrGa2S4:Eu and β-SiAlON, wherein A in A2SiO4:Eu is at least one of Ba, Sr and Ca.
The blue LED chip may have a FWHM of 10 to 30 nm, the green phosphor may have a FWHM of 30 to 100 nm and the red phosphor may have a FWHM of 50 to 200 nm. The red phosphor may include at least one of CaAlSiN3:Eu and (Ca, Sr)S:Eu. The green phosphor may include at least one of A2SiO4:Eu, SrGa2S4:Eu and β-SiAlON, wherein A in A2SiO4:Eu is at least one of Ba, Sr and Ca.
FIG. 6 illustrates color coordinate spaces of the red and green phosphors described above. Referring to FIG. 6, the CIE 1931 color chromaticity diagram is marked with a quadrilateral-shaped space r composed of four coordinate points (0.5448, 0.4544), (0.7079, 0.2920), (0.6427, 0.2905) and (0.4794), 0.4633) and a quadrilateral-shaped space g composed of four coordinate points (0.1270, 0.8037), (0.4117, 0.5861), (0.4197, 0.5136) and (0.2555, 0.5030). As described above, the red phosphor and green phosphor are selected such that color coordinates thereof fall within the quadrilateral-shaped spaces r and g, respectively.
Here, a dominant wavelength is a wavelength value derived from a curve obtained by integrating an actually-measured spectrum graph of an output light of the blue LED chip and a luminosity curve. The dominant wavelength is a value considering visibility of a person. This dominant wavelength corresponds to a wavelength value at a point where a line connecting a center point (0.333, 0.333) of the CIE 1931 color chromaticity diagram to the actually-measured color coordinate meets a contour line of the CIE 1931 chromaticity diagram. It should be noted that a peak wavelength is different from the dominant wavelength. The peak wavelength has the highest energy intensity. The peak wavelength is a wavelength value indicating the highest intensity in the spectrum graph of the actually-measured output light, regardless of luminosity.
Here, the blue LED chip 103 has a dominant wavelength of 443 to 455 nm. The red phosphor 107 has a color coordinate falling within a quadrilateral space defined by four coordinate points (0.5446, 0.4544), (0.7079, 0.2920), (0.6427, 0.2905) and (0.4794, 0.4633), based on the CIE 1931 color chromaticity diagram. The green phosphor 105 has a color coordinate falling within a quadrilateral space defined by four coordinate points (0.1270, 0.8037), (0.4117, 0.5861), (0.4197, 0.5316) and (0.2555, 0.5030). Accordingly, a liquid crystal display (LCD) device employing the white light source module 510 for a backlight unit may exhibit high color reproducibility across a very large color coordinate space covering a substantially entire s-RGB space on the CIE 1976 chromaticity diagram (see FIG. 7). This high color reproducibility is hardly attainable from a conventional combination of a blue LED chip and red and green phosphors.
The blue LED chip 103 may adopt a group-III nitride semiconductor LED device in general use. Also, the red phosphor 107 may utilize a nitride phosphor such as CaAlSiN3:Eu. This nitride red phosphor is less vulnerable to the external environment such as heat and moisture than a yellow phosphor, and less likely to be discolored. Notably, the nitride red phosphor exhibits high excitation efficiency with respect to the blue LED chip having a dominant wavelength set to a specific range of 443 to 455 nm to obtain high color reproducibility. Other nitride phosphors such as Ca2Si5N8:Eu or the yellow phosphor such as (Ca, Sr)S:Eu may be utilized as the red phosphor 107. The green phosphor 105 may adopt a silicate phosphor such as A2SiO4:Eu where A is at least one of Ba, Sr and Ca. For example, the green phosphor 105 may employ (Ba, Sr)2SiO4:Eu. The silicate phosphor demonstrates high excitation efficiency with respect to the blue LED chip having a dominant wavelength of 443 to 455 nm. Alternatively, one of SrGa2S4:Eu and β-SiAlON (Beta-SiAlON) may be utilized as the green phosphor 105.
1. A method for manufacturing a white light source module, the method comprising:
disposing a blue LED chip on a substrate, the blue LED chip having a full width at half-maximum (FWHM) of 10 to 30 nm;
selecting a red phosphor having a FWHM of 50 to 200 nm and such that red light emitted from the white light source module has a color coordinate falling within a space defined by four coordinate points (0.5448, 0.4544), (0.7079, 0.2920), (0.6427, 0.2905), and (0.4794, 0.4633) based on CIE 1931 color chromaticity diagram,
wherein the red phosphor is at least one selected from the group consisting of: CaAlSiN3:Eu and Ca2Si5N8:Eu;
selecting a green phosphor having a FWHM of 30 to 100 nm and such that green light emitted from the white light source module has a color coordinate falling within a space defined by four coordinate points (0.1270, 0.8037), (0.4117, 0.5861), (0.4197, 0.5316), and (0.2555, 0.5030) based on the CIE 1931 color chromaticity diagram; and
disposing a mixture of the red phosphor and the green phosphor around the blue LED chip, wherein the red phosphor and the green phosphor are excited by light emitted from the blue LED chip and emit red light and green light, respectively, and the blue LED chip in combination with the red phosphor and the green phosphor emit white light.
2. The method for manufacturing a white light source module according to claim 1, wherein the mixture is a uniform mixture of the red phosphor and the green phosphor.
3. The method for manufacturing a white light source module according to claim 1, wherein the green phosphor is at least one selected from the group consisting of: SrGa2S4:Eu, β-SiAlON, and A2SiO4:Eu, wherein A comprises at least one of Ba, Sr, and Ca.
4. The method for manufacturing a white light source module according to claim 1, wherein the blue light emitting diode chip has a dominant wavelength of 443 to 455 nm.
5. A method for manufacturing a white light source module, the method comprising:
disposing a blue LED chip on a substrate, the blue LED chip having a FWHM of 10 to 30 nm;
selecting a red phosphor having a FWHM of 50 to 200 nm and such that red light emitted from the white light source module has a color coordinate falling within a space defined by four coordinate points (0.5448, 0.4544), (0.7079, 0.2920), (0.6427, 0.2905), and (0.4794, 0.4633) based on CIE 1931 color chromaticity diagram;
selecting a green phosphor having a FWHM of 30 to 100 nm and such that green light emitted from the white light source module has a color coordinate falling within a space defined by four coordinate points (0.1270, 0.8037), (0.4117, 0.5861), (0.4197, 0.5316), and (0.2555, 0.5030) based on the CIE 1931 color chromaticity diagram,
wherein the green phosphor is at least one selected from the group consisting of: β-SiAlON, and A2SiO4:Eu, wherein A comprises at least one of Ba, Sr, and Ca; and
6. The method for manufacturing a white light source module according to claim 5, wherein the mixture is a uniform mixture of the red phosphor and the green phosphor.
7. The method for manufacturing a white light source module according to claim 5, wherein the red phosphor is at least one selected from the group consisting of: CaAlSiN3:Eu, Ca2Si5N8:Eu, and (Ca, Sr)S:Eu.
8. The method for manufacturing a white light source module according to claim 5, wherein the blue light emitting diode chip has a dominant wavelength of 443 to 455 nm.
9. A method for manufacturing a white light source module, the method comprising:
selecting a red phosphor having a FWHM of 50 to 200 nm, wherein the red phosphor is at least one selected from the group consisting of: CaAlSiN3:Eu and Ca2Si5N8:Eu;
selecting a green phosphor having a FWHM of 30 to 100 nm, wherein the green phosphor is at least one selected from the group consisting of: β-SiAlON, and A2SiO4:Eu, wherein A comprises at least one of Ba, Sr, and Ca; and
10. The method for manufacturing a white light source module according to claim 9, red light emitted from the white light source module has a color coordinate falling within a space defined by four coordinate points (0.5448, 0.4544), (0.7079, 0.2920), (0.6427, 0.2905), and (0.4794, 0.4633) based on CIE 1931 color chromaticity diagram.
11. The method for manufacturing a white light source module according to claim 9, green light emitted from the white light source module has a color coordinate falling within a space defined by four coordinate points (0.1270, 0.8037), (0.4117, 0.5861), (0.4197, 0.5316), and (0.2555, 0.5030) based on the CIE 1931 color chromaticity diagram.
12. The method for manufacturing a white light source module according to claim 9, the disposing of the mixture of the red phosphor and the green phosphor includes forming a resin encapsulant encapsulating the blue light emitting diode chip, wherein the mixture of the green phosphor and the red phosphor are dispersed in the resin encapsulant.
13. The method for manufacturing a white light source module according to claim 9, wherein the blue light emitting diode chip has a dominant wavelength of 443 to 455 nm.
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