KR20120104704A - Green phosphor, light emitting device, display apparatus and illumination apparatus - Google Patents

Abstract

PURPOSE: A green phosphor with superior color purity, a light emitting device with excellent color reproducibility and color rendering, a display device, and an illumination device are provided to enhance color purity and to obtain high brightness. CONSTITUTION: A green phosphor includes M element, Al element, silicon, oxygen and nitrogen as parent components and one or more rare earth materials as dopant. Here, M indicates one or more elements selected from a group consisting of Mg, Ca, Sr and Ba, and the rare earth element is selected from a group consisting of Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and Yb. If the maximum intensity diffraction peak at the X-ray diffraction pattern is 100%, the relative intensity of 2Θ has the diffraction peak of greater than 20% in a range of 29.0-30.5 degrees and 31.0-31.5 degrees. [Reference numerals] (AA) Strength; (BB) Wave(nm)

Description

Green phosphor, light emitting device, display device and lighting device using the same {GREEN PHOSPHOR, LIGHT EMITTING DEVICE, DISPLAY APPARATUS AND ILLUMINATION APPARATUS}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to phosphors, and more particularly, to green phosphors having excellent color purity, and white light emitting devices and lighting devices having high color reproducibility and excellent color rendering properties.

In general, phosphor materials for wavelength conversion are used as materials for converting specific wavelength light of various light sources into desired wavelength light. In particular, since light emitting diodes among various light sources can be advantageously applied as LCD backlights, automobile lights, and home lighting devices due to low power driving and excellent light efficiency, phosphor materials have recently been spotlighted as a core technology for manufacturing white light emitting devices.

In general, white light emitting devices are manufactured by applying one or more phosphors (eg, yellow or red and blue) to a blue or ultraviolet LED chip. In particular, in the form using a combination of one or more other phosphors with a red phosphor, it is difficult to secure a sufficient color rendering index when the half-value width of each phosphor is low, there is a limit to implement the desired natural white light. Such a demand for color rendering may be an important evaluation matter when the white light emitting device is employed as a light source for illumination.

In particular, since the conventional green phosphor has a problem of low color purity and relatively low luminance, when used in combination with phosphors of different colors in a white light emitting device, it is difficult to realize excellent color rendering with high color reproducibility. This has been.

One of the objectives of the present invention is to solve the above-mentioned problems of the prior art, and to provide a new green phosphor that can guarantee high brightness while excellent in color purity.

Another object of the present invention is to provide a white light emitting device and a lighting device having high color reproducibility and excellent color rendering index by employing the green phosphor.

In order to realize the above technical problem, one aspect of the present invention is

It contains at least one rare earth element (Re) as an activator, with at least M element and Al element and silicon, oxygen and nitrogen as parent member elements, where M is from a group consisting of Mg, Ca, Sr and Ba At least one element selected, and the rare earth element Re is selected from the group consisting of Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm and Yb, and has an X-ray diffraction pattern When the diffraction peak of the maximum intensity is 100% in the present invention provides a green phosphor having a phase exhibiting a diffraction peak of 20% or more relative intensity in the range 29.0 ° 30.5 ° and 31.0 ° 31.5 °.

The phosphor may emit light having a peak wavelength in the range of 520 to 530 nm when irradiating an excitation source having a 430 nm to 470 nm peak wavelength.

In the X-ray diffraction pattern of the phosphor, a relative intensity may exhibit a diffraction peak of 20% or more in the range of 26.3 ° -27.3 °, 33.0 ° -34.0 °, and 35.5 ° -36.5 °.

The phosphor may be represented by the general formula Ba _q Si _{m - x} Al _x O _y N _{n -y} : Re, wherein m is a multiple of 3 ± 0.2, n is a multiple of 4 ± 0.2, 0.1 < It satisfies q / m ≤ 0.7 and 0.001 <x / m ≤ 0.1. Here, the rare earth element Re as the activator may include Eu.

According to another aspect of the present invention, there is provided an LED chip that emits excitation light, a green phosphor according to any one of claims 1 to 6 disposed around the LED chip to wavelength convert at least a portion of the excitation light, And at least one light emitting element for providing light having a wavelength different from that of the LED chip and the light emitting wavelength of the green phosphor, wherein the at least one light emitting element is at least one of an additional LED chip and a phosphor of another kind. Provided is a white light emitting device.

The LED chip is a blue LED chip having a peak wavelength in the range of 430 ~ 470nm, the at least one light emitting element may include a red phosphor. In this case, the emission wavelength peak of the red phosphor may be 600-660 nm, and the emission wavelength peak of the green phosphor may be 520-530 nm.

Another aspect of the invention, the display device includes an LED light source module, an image display panel for displaying an image, irradiated with the light of the LED light source module, the LED light source module, the circuit board, the circuit The display device may include a white light emitting device mounted on a substrate and using the above-described green phosphor as a wavelength conversion material.

Another aspect of the present invention includes an LED light source module and a diffusion sheet disposed above the LED light source module and uniformly diffusing light incident from the LED light source module, wherein the LED light source module includes a circuit board. And a white light emitting device mounted on the circuit board and using the above-described green phosphor as a wavelength converting material.

New green phosphors can be implemented to combine the advantages of each crystal to provide wavelength converting materials with superior properties. By partially employing the crystals of the β-sialon phosphor, red light having a large half width can be provided to ensure high color rendering, and a light emission spectrum that satisfies various characteristics according to the ratio can be provided. As compared with the conventional white light emitting device, a CRI (color rendering index) synergistic effect of 5% or more can be expected.

In addition, by partially substituting the nitrogen element in place of the oxygen element together with the aluminum content, new complex crystals can be introduced to ensure high color rendering, and also have high luminescence properties and excellent thermal and chemical safety expected in nitride-based phosphors. By this advantage, it can be advantageously used for manufacturing high power / high reliability white light emitting devices.

1 is a graph comparing XRD diffraction patterns of a green phosphor and a conventional green phosphor according to an embodiment of the present invention.
2 is a graph showing the main part of the XRD diffraction pattern of the green phosphor according to the embodiment of the present invention.
Figure 3 is a graph showing the emission spectrum of the green phosphor and the conventional green phosphor according to an embodiment of the present invention.
4 to 6 are schematic diagrams illustrating a white light emitting device according to various embodiments of the present disclosure.
7 and 8 are side cross-sectional views schematically showing an LED light source module according to an embodiment of the present invention.
9A and 9B are cross-sectional views illustrating a backlight unit according to various embodiments of the present disclosure.
10 is an exploded perspective view showing a display device according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings and embodiments will be described the present invention in more detail.

The green phosphor according to the present invention contains at least one rare earth element (Re) as an activator together with at least M element and Al element and silicon, oxygen and nitrogen as the parent member. Here, M is at least one element selected from the group consisting of Mg, Ca, Sr and Ba, and the rare earth element Re is Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er , Tm and Yb.

In addition, the green phosphor according to the present invention may be defined as an X-ray diffraction pattern. In the X-ray diffraction pattern for the green phosphor, 2θ shows a diffraction peak in a range of 29.0 ° to 30.5 ° and 31.0 ° to 31.5 °. At this time, each diffraction peak has a relative intensity of 20% or more when the diffraction peak of maximum intensity is 100% (see Examples and Figs. 1 and 2).

In addition, in the X-ray diffraction pattern of the phosphor, the relative intensity may exhibit a diffraction peak of 20% or more in the range of 26.3 ° -27.3 °, 33.0 ° -34.0 °, and 35.5 ° -36.5 °.

The novel green phosphor may emit light having a peak wavelength in the range of 520 to 530 nm when irradiating an excitation source having a 430 nm to 470 nm peak wavelength. The half width is also relatively narrow, and color purity is superior to that of the green phosphor having a conventional 540 nm peak wavelength. By using the green phosphor having excellent color purity, the white light emitting device can be expected to have an excellent color reproducibility while improving the color rendering index.

The green phosphor is represented by the general formula _{Ba q Si m - x Al x} O y N n -y: and can be expressed by Re, and, wherein, m is a multiple of ± 0.2 3, n is a multiple of 4 ± 0.2, 0.1 <q / m ≤ 0.7 and 0.001 <x / m ≤ 0.1 are satisfied. Here, the rare earth element Re as the activator may include Eu.

A rare earth element (Re) compound to be used as an activator is measured and mixed with at least M element or a compound thereof, Al or Al compound and Si or Si compound. Here, each compound may be any one of carbonate, oxide and nitride.

Here, M is at least one element selected from the group consisting of Mg, Ca, Sr and Ba, and the rare earth element Re is Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er , Tm and Yb.

The mixture is calcined at 1800-2200 ° C. in a nitrogen atmosphere, the calcined results are collected and pulverized, and a desired green phosphor can be prepared through a predetermined post-heat treatment and pickling process.

Hereinafter, the present invention will be described in more detail through various embodiments, but the technical spirit of the present invention is not limited to these embodiments.

Hereinafter, the present invention will be described in more detail through various embodiments, but the technical spirit of the present invention is not limited to these embodiments.

< Example >

Raw materials BaO, Si ₃ N ₄ , Al ₂ O ₃ , Eu ₂ O ₃ were weighed to prepare raw materials, and the prepared raw materials were mixed with an ethanol solvent using a ball mill.

In the raw material mixture, a ethanol solvent was volatilized using a dryer, a boron nitride (BN) crucible was filled with the dried raw material mixture, a boron nitride crucible filled with the raw material mixture was inserted into a heating furnace, and a nitrogen (N ₂ ) atmosphere was added. The gas was calcined at 1950 ° C. for 8 hours.

The calcined phosphor was pulverized, and a composite crystal phosphor was prepared through a predetermined post-heat treatment and pickling process.

The X-ray diffraction (XRD) pattern for the conventional β-SIALON along with the green phosphor synthesized according to the embodiment was measured and shown in FIG. 1.

Referring to Fig. 1, the XRD pattern ⓐ according to the green phosphor of the embodiment shows an inherent peak region in the region marked A mainly in comparison with the conventional XRD pattern ⓑ of β-SIALON.

Referring to Fig. 2 showing an enlarged area A in the XRD pattern of Fig. 1, when the diffraction peak of maximum intensity (@ about 34 °) is 100%, 2θ is in the range of 29.0 ° to 30.5 ° and 31.0 ° to 31.5 °. Relative intensity in the range shows a diffraction peak of 20% or more.

Specifically, as shown in FIG. 2, four diffraction peaks (about 29.1 °, about 29.6 °, about 30.1 °, and about 30.3 °) are displayed in the range of 29.0 ° to 30.5 °, and 2 in the range of 31.0 ° to 31.5 °. Diffraction peaks (about 31.2 °, about 31.3 °).

In addition to the diffraction peaks described above, in the X-ray diffraction pattern of the phosphor, as shown in FIG. 1, similar to the XRD pattern (ⓑ) of β-SIALON, 26.3 ° -27.3 °, 33.0 ° -34.0 °, and 35.5 ° Relative intensity in the range of 36.5 ° can exhibit diffraction peaks of 20% or more.

Figure 3 is a graph showing the emission spectrum of the green phosphor (ⓐ) and the conventional β-SIALON green phosphor (ⓑ) according to an embodiment of the present invention.

As shown in Fig. 3, the conventional β-SIALON (ⓑ) has a peak wavelength of about 540 nm, whereas the green phosphor according to the present invention is shifted shorter by about 15 nm with a peak wavelength of about 525 nm. You can check it. That is, it can be seen that the light emission wavelength of the green phosphor according to the present embodiment is shorter, thereby providing higher color purity than the conventional green phosphor.

Hereinafter, various application forms including phosphors according to the present invention will be described with reference to the accompanying drawings.

4 is a schematic view showing a white light emitting device according to an embodiment of the present invention.

As shown in Fig. 4, the white light emitting device 10 according to the present embodiment includes a blue LED chip 15 and a resin packaging portion 19 having a lens shape convex upwardly.

The resin packaging portion 19 employed in the present embodiment is exemplified in a form having a hemispherical lens shape so as to secure a wide orientation. The blue LED chip 15 may be directly mounted on a separate circuit board. The resin packaging unit 19 may be made of the silicone resin, the epoxy resin, or a combination thereof. The green phosphor 12 and the red phosphor 14 are dispersed in the resin packaging unit 19.

The green phosphor 12 may be a green phosphor having a high color purity as described above. Of course, the green phosphor 12 may be used together with other known green phosphors.

On the other hand, the red phosphor 14 employable in the present embodiment includes a nitride phosphor of M1AlSiN _x : Re (1≤x≤5), a sulfide phosphor of M1D: Re, and (Sr, L) ₂ SiO _{4 - x} N at least one selected from a silicate-based phosphor having _y : Eu (where 0 <x <4 and y = 2x / 3).

Wherein M 1 is at least one element selected from Ba, Sr, Ca, and Mg, D is at least one element selected from S, Se, and Te, and L is at least selected from the group consisting of Ba, Ca, and Mg One Group 2 element or at least one Group 1 element selected from the group consisting of Li, Na, K, Rb and Cs, D is at least one selected from S, Se and Te, and Re is Y, La , Ce, Nd, Pm, Sm, Gd, Tb, Dy, Ho, Er, Tm, Yb, Lu, F, Cl, Br and I.

In the case of the silicate-based phosphor of (Sr, L) ₂ SiO _{4 - x} N _y : Eu among the red phosphors, preferably, the x range may be 0.15 ≦ x ≦ 3. Some of Si in the above formula may be substituted with other elements. For example, it may be substituted with at least one element selected from the group consisting of B, Al, Ga, and In. Alternatively, with at least one element selected from the group consisting of Ti, Zr, Gf, Sn, and Pb. Can be substituted.

The dominant wavelength of the blue LED chip may range from 430 nm to 470 nm. In this case, the emission wavelength peak of the green phosphor 12 is in the range of 520 to 530 nm, and the emission wavelength peak of the red phosphor 14 is in order to secure a broad spectrum in the visible light band and improve a larger color rendering index. It may range from 600-660 nm.

As described above, in the present invention, by using the green phosphor according to the present invention having excellent color purity together with the red phosphor, white light having a high color rendering index of 70 or more can be provided, and color reproducibility can be improved.

In another embodiment of the present invention, in addition to the red phosphor 12 and the green phosphor 14 described above, it may further include a yellow to yellow orange phosphor. In this case, a more improved color rendering index can be obtained. This embodiment is shown in FIG.

Referring to FIG. 5, the white light emitting device 20 according to the present embodiment includes a package main body 21 having a reflection cup at the center, a blue LED chip 25 mounted at the bottom of the reflection cup, and a reflection cup. The transparent resin packaging part 29 which encloses the blue LED chip 25 is included.

The resin packaging part 29 may be formed using, for example, a silicone resin, an epoxy resin, or a combination thereof. In the present embodiment, the resin packaging portion 29 further includes yellow to yellowish orange phosphors 26 together with the green phosphors 22 and the red phosphors 24 described in FIG.

Here, as described above, the green phosphor 22 can be used alone or in combination with other known green phosphors according to the present invention, and the red phosphor 24 is M1AlSiN _x : Re (1≤x It may further include at least one of a nitride-based phosphor of ≤5) and a sulfide-based phosphor of M1D: Re.

In addition, the third phosphor 26 employed in the present embodiment may be a yellow to yellowish orange phosphor capable of emitting light in a wavelength band located between the green and red wavelength bands. The yellow to yellow orange phosphor may be a silicate-based phosphor, and the yellow orange phosphor may be α-SiAlON: Re-based or a garnet-based phosphor of YAG or TAG.

In the above-described embodiment, a form in which two or more kinds of phosphor powders are mixed and dispersed in a single resin packaging portion region is illustrated, but other structures may be variously changed. More specifically, the two or three phosphors may be provided in different layer structures.

In one example, the green phosphor, the red phosphor, and the yellow to yellow orange phosphor may be provided as a multilayered phosphor film by dispersing the phosphor powder at high pressure. On the contrary, as shown in FIG. 6, it may be implemented with a plurality of phosphor-containing resin layer structures.

Referring to FIG. 6, the white light emitting device 30 according to the present embodiment, similar to the previous embodiment, has a package main body 31 having a reflective cup in the center and a blue LED 35 mounted on the bottom of the reflective cup. ) And a transparent resin package 39 encapsulating the blue LED 35 in the reflection cup.

On the resin packaging part 39, resin layers containing different phosphors are provided. That is, the wavelength conversion portion is formed into the first resin layer 32 containing the green phosphor, the second resin layer 34 containing the red phosphor, and the third resin layer 36 containing the yellow or yellow orange phosphor. Can be configured.

As the phosphor used in the present embodiment, a phosphor that is the same as or similar to the phosphor illustrated in FIG. 6 may be adopted.

White light obtained through the combination of the phosphors proposed in the present invention can obtain a high color rendering index. That is, when the yellow phosphor is coupled to the blue LED chip, yellow light converted with the blue wavelength light can be obtained. Since there is little wavelength light in the green and red bands in the entire visible light spectrum, it is difficult to secure a color rendering index close to natural light. In particular, the converted yellow light has a narrow half-width in order to obtain high conversion efficiency, so that the color rendering index will be further lowered in this case. In addition, since the characteristics of the white light expressed by a single yellow conversion degree are easily changed, it is difficult to ensure excellent color reproducibility.

On the contrary, in the invention example combining the blue LED chip, the green phosphor (G) and the red phosphor (R), since the light is emitted in the green and red bands as compared with the conventional example, a broader spectrum can be obtained in the visible light band. This can greatly improve the color rendering index. In addition, the color rendering index may be further improved by further including a yellow or yellowish orange phosphor capable of providing an intermediate wavelength band between the green and red bands.

Another aspect of the invention can provide a white light source module that can be advantageously used as a light source of the LCD backlight unit. That is, the white light source module according to the present invention may be combined with various optical members (diffusion plate, light guide plate, reflector plate, prism sheet, etc.) as a light source of the LCD backlight unit to form a backlight assembly. 7 and 8 illustrate this white LED light source module.

First, referring to FIG. 7, the LED light source module 50 includes a circuit board 51 and an array of a plurality of white LED devices 10 mounted thereon. A conductive pattern (not shown) connected to the LED device 10 may be formed on the upper surface of the circuit board 51.

Each white LED device 10 can be understood as a white LED device shown and described in FIG. That is, the blue LED 15 is directly mounted on the circuit board 51 by a chip on board (COB) method. The configuration of each white LED device 10 includes a hemispherical resin packaging unit 19 having a lens function without having a separate reflective wall, so that each white LED device 20 can exhibit a wide orientation angle. have. The wide direct angle of each white light source can contribute to reducing the size (thickness or width) of the LCD display.

Referring to FIG. 8, the LED light source module 60 includes a circuit board 61 and an array of a plurality of white LED devices 20 mounted thereon. As illustrated in FIG. 5, the white LED device 20 includes a blue LED chip 25 mounted in a reflecting cup of the package body 21 and a resin packaging part 29 encapsulating the resin. In 29), the green phosphor 22 and the yellow or yellowish orange phosphor 26 are dispersed together with the red phosphor 24 including the above-mentioned complex crystal phosphor.

9A and 9B are cross-sectional views illustrating an example of a backlight unit according to various embodiments of the present disclosure.

9A, an edge type backlight unit 1500 is illustrated as an example of a backlight unit to which a light emitting diode package according to the present invention may be applied as a light source.

The edge type backlight unit 1500 according to the present exemplary embodiment may include a light guide plate 1440 and an LED light source module 1300 provided on both side surfaces of the light guide plate 1440.

In the present exemplary embodiment, the LED light source module 1300 is illustrated on both opposite sides of the light guide plate 1440. However, the LED light source module 1300 may be provided on only one side. Alternatively, an additional LED light source module may be provided on the other side. .

As shown in FIG. 9A, a reflecting plate 1420 may be additionally provided under the light guide plate 1440. The LED light source module 1300 employed in the present embodiment includes a printed circuit board 1310 and a plurality of LED light sources 1350 mounted on an upper surface of the substrate 1310, wherein the LED light source 1350 is the green described above. A light emitting device package using a phosphor is applied.

9B, a direct backlight unit 1800 is illustrated as an example of another type of backlight unit.

The direct type backlight unit 1800 according to the present exemplary embodiment may include a light diffusion plate 1740 and an LED light source module 1600 arranged on the bottom surface of the light diffusion plate 1740.

The backlight unit 1800 illustrated in FIG. 9B may include a bottom case 1710 that may receive the light source module under the light diffusion plate 1740.

The LED light source module 1600 employed in the present embodiment includes a printed circuit board 1610 and a plurality of LED light sources 1650 mounted on an upper surface of the substrate 1610. The plurality of LED light sources 1650 may be light emitting device packages using the above-described green phosphor as a wavelength conversion material.

Of course, the green phosphor according to the present invention is not directly applied to the LED light source, but may be implemented in a form applied to other devices such as a backlight unit.

10 is an exploded perspective view showing a display device according to an embodiment of the present invention.

The display apparatus 2000 illustrated in FIG. 10 includes a backlight unit 2200 and an image display panel 2300 such as a liquid crystal panel. The backlight unit 2200 includes a light guide plate 224 and an LED light source module 2100 provided on at least one side of the light guide plate 2240.

In the present exemplary embodiment, the backlight unit 2200 may further include a bottom case 2210 and a reflector 2220 disposed under the light guide plate 2240, as shown.

In addition, according to the demand for various optical properties, the light guide plate 2240 and the liquid crystal panel 2300 may include various types of optical sheets 2260 such as a diffusion sheet, a prism sheet, or a protective sheet.

The LED light source module 2100 may be mounted on at least one side of the light guide plate 2240 and mounted on the printed circuit board 2110 to inject light into the light guide plate 2240. A plurality of LED light source 2150 is included. The plurality of LED light sources 2150 may be the above-described light emitting device package. The plurality of LED light sources employed in the present embodiment may be side view type light emitting device packages in which side surfaces adjacent to the light emitting surface are mounted.

As described above, the above-described phosphor may be applied to a package of various mounting structures to be applied to an LED light source module that provides various types of white light. The light emitting device package or the light source module including the same may be applied to various types of display devices or lighting devices.

It is intended that the invention not be limited by the foregoing embodiments and the accompanying drawings, but rather by the claims appended hereto. It will be apparent to those skilled in the art that various changes in form and details may be made therein without departing from the spirit and scope of the invention as defined by the appended claims. something to do.

Claims (12)

It contains at least one rare earth element (Re) as an activator, with at least M element and Al element and silicon, oxygen and nitrogen as parent member elements, where M is from a group consisting of Mg, Ca, Sr and Ba At least one element selected, and the rare earth element Re is selected from the group consisting of Ce, Pr, Nd, Sm, Eu, Gd, Tb, Dy, Ho, Er, Tm, and Yb,
A green phosphor having a phase in which 2θ exhibits a diffraction peak of 20% or more in a relative intensity in the range of 29.0 ° to 30.5 ° and 31.0 ° to 31.5 ° when the diffraction peak of the maximum intensity is 100% in the X-ray diffraction pattern.
The method of claim 1,
The green fluorescent substance which irradiates the excitation source which has a 430 nm-470 nm peak wavelength, and emits light which has a peak wavelength in the range of 520-530 nm.
The method of claim 1,
The green phosphor according to the X-ray diffraction pattern, the relative intensity shows a diffraction peak of 20% or more in the range of 26.3 ° ~ 27.3 °, 33.0 ° ~ 34.0 ° and 35.5 ° ~ 36.5 °.
The method of claim 1,
General formula Ba _q Si _{m - x} Al _x O _y N _{n -y} : Re, wherein m is a multiple of 3 ± 0.2, n is a multiple of 4 ± 0.2, 0.1 <q / m ≤ 0.7 And 0.001 <x / m ≤ 0.1.
The method of claim 1,
The green earth phosphor, characterized in that the rare earth element (Re) is the activator comprises Eu.
An LED chip emitting excitation light;
A green phosphor disposed around the LED chip to wavelength convert at least a portion of the excitation light, and comprising: a green phosphor according to any one of claims 1 to 6; And
At least one light emitting element for providing light of a wavelength different from the emission wavelength of the LED chip and the emission wavelength of the green phosphor,
Wherein said at least one light emitting element is at least one of an additional LED chip and another type of phosphor.
The method of claim 6,
The LED chip is a blue LED chip having a peak wavelength in the range of 430 ~ 470nm,
The at least one light emitting element is a white light emitting device, characterized in that it comprises a red phosphor.
The method of claim 7, wherein
The emission wavelength peak of the red phosphor is 600 ~ 660nm, the emission wavelength peak of the green phosphor is 520 ~ 530nm, characterized in that the white light emitting device.
Display device using the green phosphor according to any one of claims 1 to 5 as a wavelength conversion material.
LED light source module; And
It is irradiated with light of the LED light source module, and comprises an image display panel for displaying an image,
The LED light source module includes a circuit board and a white light emitting device mounted on the circuit board and using the green phosphor according to any one of claims 1 to 5 as a wavelength converting material.
An illumination device using the green phosphor according to any one of claims 1 to 5 as a wavelength conversion material.
LED light source module; And
And a diffusion sheet disposed on the LED light source module and uniformly diffusing the light incident from the LED light source module.
The LED light source module includes a circuit board and a white light emitting device mounted on the circuit board and using a green phosphor according to any one of claims 1 to 5 as a wavelength conversion material.

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