KR20200000933A - Phosphor composition, light emitting device package having thereof - Google Patents

Abstract

The present invention relates to a phosphor composition comprising a green phosphor having a perovskite structure represented by chemical formula 1, Cs_αRb_(1-α)AX_3, and to a light emitting device package comprising the same. The phosphor composition comprises a KSF-based red phosphor, thereby implementing three wavelength spectrums of a white light source using the blue light emission wavelength as the excitation wavelength, wherein 0 < α < 1, A is a group 4A metal, and X is a halogen group element.

Description

Phosphor composition, light emitting device package including the same {PHOSPHOR COMPOSITION, LIGHT EMITTING DEVICE PACKAGE HAVING THEREOF}

The present invention relates to a phosphor composition and a light emitting device package including the same.

A semiconductor device including a compound such as GaN, AlGaN, etc. has many advantages, such as having a wide and easy-to-adjust band gap energy, and can be used in various ways as a light emitting device, a light receiving device, and various diodes.

Particularly, light emitting devices such as light emitting diodes and laser diodes using semiconductors of Group 3-5 or Group 2-6 compound semiconductors have been developed through the development of thin film growth technology and device materials. Various colors such as blue and ultraviolet light can be realized, and efficient white light can be realized by using fluorescent materials or color combinations, and low power consumption, semi-permanent life, and fast response speed compared to conventional light sources such as fluorescent and incandescent lamps. It has the advantages of safety, environmental friendliness.

In addition, when a light-receiving device such as a photodetector or a solar cell is also manufactured using a group 3-5 or 2-6 compound semiconductor material of a semiconductor, the development of device materials absorbs light in various wavelength ranges to generate a photocurrent. As a result, light in various wavelengths can be used from gamma rays to radio wavelengths. In addition, it has the advantages of fast response speed, safety, environmental friendliness and easy adjustment of the device material, so that it can be easily used for power control or microwave circuit or communication module.

Therefore, the semiconductor device may replace a light emitting diode backlight, a fluorescent lamp, or an incandescent bulb, which replaces a cold cathode tube (CCFL) constituting a backlight module of an optical communication means, a backlight of a liquid crystal display (LCD) display device. Applications are expanding to include white LED lighting devices, automotive headlights and traffic lights, and sensors that detect gas or fire. In addition, the application of semiconductor devices can be extended to high frequency application circuits, other power control devices, and communication modules. Among the light emitting devices, nitride semiconductors develop optical devices and high output electronic devices by high thermal stability and wide bandgap energy. Has received great attention in the field.

As a method of implementing white light using such a light emitting device, there are a method using a single chip and a method using a multi chip.

More specifically, when a single chip implements white light, a light emitted from a blue LED and a method of exciting white light by using the same to excite at least one phosphor and a fluorescent material on a blue or ultraviolet (UV) light emitting diode chip There is a method of combining, and when implementing white light in a multi-chip, there is a method of obtaining white light by combining three types of chips (Red, Green, Blue).

Currently, the display market is growing in the OLED market with high color quality and color reproduction rate, and the technological alternative of LED light source is facing the technical demand to significantly improve the color reproduction rate compared to the existing OLED market to cope with the growing OLED market.

In order to improve the color reproducibility of the LED light source, the color quality of the white light source of the LED must be improved, and a white light source is currently based on a method of mixing a green phosphor and a red phosphor on a blue chip. Is trying to improve the color quality.

1 is an exemplary diagram of a CIE color coordinate and an NTSC color reproduction range (N).

Conventional LED technology implements white light by combining a green phosphor of β-SiAlON composition and a red phosphor of K ₂ SiF ₆ : Mn ^{4 +} (KSF) composition on a blue LED chip as shown in FIG. 1. The color reproducibility (NTSC) ratio of the white light source implemented as described above is about 92%, which can be seen as remaining at an uncompetitive level compared to the color reproducibility of OLED.

Referring to FIG. 1, in order to improve color reproducibility in an existing LED, the emission wavelength of the green phosphor or the emission wavelength of the red phosphor is moved to a deeper side, that is, from GR to GE or from RR to RE, as shown in FIG. 1. I'm moving.

However, in the conventional green phosphor including β-SiAlON, the emission wavelength is not shifted to a deeper depth as shown in FIG. 1, so that it is difficult to improve color reproduction, and thus, there is an increasing demand for developing a green phosphor that can solve the problem. Doing. The present invention relates to this.

SUMMARY OF THE INVENTION The present invention has been made in an effort to provide a phosphor composition including a green phosphor having a narrow half width.

In addition, the present invention provides a light emitting device package using the same, thereby improving color reproduction of the light emitting device package.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

The phosphor composition according to an embodiment of the present invention includes a green phosphor having a perovskite structure represented by Chemical Formula 1.

[Formula 1]

Cs _α Rb _{1 - α} AX ₃

(Where 0 <α <1, A is a Group 4A metal and X is a halogen group element)

A may be 0.45 or more and 0.55 or less.

The central peak of the emission wavelength of the green phosphor may be 505 nm or more and 520 nm or less, and the half width may be 25 nm or more and 30 nm or less.

The phosphor composition may further include a KSF-based red phosphor represented by Chemical Formula 2, and may implement white light by a blue light source.

[Formula 2]

A ₂ M _{1 - x} F ₆ : Mn ^{4 +} _x

Here, A is at least one alkali metal selected from lithium (Li), sodium (Na), potassium (K), rubidium (Rb) and cesium (Cs), and M is a group composed of Group 4 or 14 elements. Is at least one element selected from, and x satisfies 0 <X ≦ 0.2.

20 wt% or more to 40 wt% or less of the green phosphor and 60 wt% or more to 80 wt% or less of the red phosphor.

The green phosphor may be in powder form.

Meanwhile, the light emitting device package according to another embodiment of the present invention includes a body, a first light emitting chip disposed on the body, a molding member disposed on the first light emitting chip, and a phosphor composition disposed in the molding member. The phosphor composition includes a green phosphor having a perovskite structure represented by Chemical Formula 1.

 [Formula 1]

Cs _α Rb _{1 - α} AX ₃

(Where 0 <α <1, A is a Group 4A metal and X is a halogen group element)

A may be 0.45 or more and 0.55 or less.

The central peak of the emission wavelength of the green phosphor may be 505 nm or more and 520 nm or less, and the half width may be 25 nm or more and 30 nm or less.

The phosphor composition may further include a KSF-based red phosphor represented by Chemical Formula 2, and may implement white light by a blue light source.

[Formula 2]

A ₂ M _{1 - x} F ₆ : Mn ^{4 +} _x

Here, A is at least one alkali metal selected from lithium (Li), sodium (Na), potassium (K), rubidium (Rb) and cesium (Cs), and M is a group composed of Group 4 or 14 elements. Is at least one element selected from, and x satisfies 0 <X ≦ 0.2.

20 wt% or more to 40 wt% or less of the green phosphor and 60 wt% or more to 80 wt% or less of the red phosphor.

The green phosphor may be in powder form.

The perovskite phosphor of the phosphor composition according to an embodiment of the present invention has an effect of having a narrow half width of 30 nm or less.

The phosphor composition according to an embodiment of the present invention may include a perovskite phosphor having a narrow half-width of 30 nm or less and a KSF-based red phosphor, thereby improving color reproducibility of the light emitting device including the phosphor composition. .

Phosphor composition according to an embodiment of the present invention, by powdering the perovskite phosphor applied to the light emitting device package, there is an effect that the problem of lowering the luminous performance of the light emitting device package can be solved because no additional solvent is added. have.

Effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is an exemplary diagram of a CIE color coordinate and an NTSC color reproduction range (N).
2 is a cross-sectional view of a package 100 of a light emitting device according to an embodiment of the present invention.
3 is a graph showing the emission wavelength of the β-SiAlON phosphor.
4 is a graph showing excitation wavelengths of β-SiAlON phosphors.
5 is a graph showing the emission wavelength of the perovskite phosphor represented by the formula (1).
6 is a graph showing the excitation wavelength of the perovskite phosphor represented by the formula (1).
FIG. 7 is a graph showing emission wavelengths measured by changing the ratio of Cs and Rb of the perovskite phosphor represented by Chemical Formula 1. FIG.
8 to 11 are views illustrating color reproduction ranges of an embodiment and a comparative example in color coordinates.
12 is a graph measuring white light spectra of Examples and Comparative Examples.
13 is a graph showing the CIE distribution ranges of Examples and Comparative Examples.

Hereinafter, the details of the above-described objects and technical configurations of the present invention and the effects thereof will be more clearly understood by the following detailed description.

In the description of the present invention, terms such as first and second which are used hereinafter are merely identification symbols for distinguishing the same or corresponding components, and the same or corresponding components are used as the first and second terms. It is not limited to.

Singular expressions include plural expressions unless the context clearly indicates otherwise. The terms “comprises” or “having” are intended to indicate that a feature, number, step, operation, component, part, or combination thereof is present in the specification and that one or more other features, numbers, or steps are present. It is to be understood that the acts, components, parts or combinations thereof may be added.

As used herein, “comprises” and / or “comprising” refers to the presence of one or more other components, steps, operations and / or elements, or Does not exclude additional

In the description of the present invention, each layer (film), region, pattern or structure is "on" or "under" the substrate, each layer (film), region, pad or pattern. "Formed in" includes both those formed directly or through another layer. Criteria for the top / bottom or bottom / bottom of each layer will be described with reference to the drawings.

Hereinafter, a green phosphor and a light emitting device package including the same according to an embodiment of the present invention will be described in detail with reference to the accompanying drawings.

2 is a cross-sectional view of a package 100 of a light emitting device according to an embodiment of the present invention.

Referring to FIG. 2, the light emitting device package 100 may include a body 11, a plurality of lead frames 21 and 23, a first light emitting chip 25, a phosphor composition 30, and a molding member 41. It may include at least one.

For example, the light emitting device package 100 according to the embodiment may include a body 11 and a plurality of lead frames 21 and 23 disposed on the body 11 and a plurality of lead frames 21 and 23. The light emitting chip 25 and the first light emitting chip 25 may include a molding member 41 having the phosphor composition 30. The phosphor composition 30 may include, but is not limited to, a first phosphor 31 and a second phosphor 32.

The body 11 may be formed of a material having a reflectance higher than the transmittance, for example, 70% or more, with respect to the wavelength emitted by the first light emitting chip 25.

The body 11 may be defined as a non-transparent material when the reflectance is 70% or more.

The body 11 may be formed of a resin-based insulating material, for example, a resin material such as polyphthalamide (PPA). Alternatively, the body 11 may include a metal oxide added to a resin material such as epoxy or silicon, and the metal oxide may include at least one of TiO ₂ , SiO ₂ , and Al ₂ O ₃ .

The body 11 may include a silicon-based, epoxy-based, or plastic material, and may be formed of a thermosetting resin, or a high heat resistance and high light resistance material.

In addition, the body 11 may be selectively added among an acid anhydride, an antioxidant, a release material, a light reflector, an inorganic filler, a curing catalyst, a light stabilizer, a lubricant, and titanium dioxide.

In addition, the body 11 may be molded by at least one selected from the group consisting of an epoxy resin, a modified epoxy resin, a silicone resin, a modified silicone resin, an acrylic resin, and a urethane resin.

For example, the body 11 is epoxy resin which consists of triglycidyl isocyanurate, hydrogenated bisphenol A diglycidyl ether, etc., hexahydro phthalic anhydride, 3-methylhexahydro phthalic anhydride 4-methylhexahydro anhydride. An acid anhydride made of phthalic acid or the like is added to the epoxy resin as a curing accelerator by adding DBU (1,8-Diazabicyclo (5,4,0) undecene-7) and ethylene glycol, titanium oxide pigment, and glass fiber as a promoter. It can use the solid epoxy resin composition which carried out the hardening reaction partially by B stage, and is not limited to this.

In addition, a light blocking material or a diffusion agent may be further mixed in the body 11 to reduce light transmitted therethrough. In addition, the body 11 may be appropriately mixed with at least one selected from the group consisting of a diffusing agent, a pigment, a fluorescent material, a reflective material, a light-shielding material, a light stabilizer, and a lubricant to the thermosetting resin in order to have a predetermined function. Can be.

The body 11 may include a cavity in which an upper portion of the body 11 is recessed to a predetermined depth from an upper surface of the body 11. The cavity may be formed in the form of a concave cup structure, an open structure, or a recess structure, but is not limited thereto.

The cavity has a width that gradually widens upward, thereby improving light extraction efficiency.

A plurality of lead frames, for example, first and second lead frames 21 and 23 may be disposed on the body 11. The first and second lead frames 21 and 23 may be disposed at the bottom of the cavity, and outer portions of the first and second lead frames 21 and 23 may be at least one of the bodies 11 through the body 11. May be exposed on the side. Lower portions of the first lead frame 21 and the second lead frame 23 may be exposed to the lower portion of the body 11 and mounted on a circuit board to receive power.

As another example of the first and second lead frames 21 and 23, at least one or both of the first and second lead frames 21 and 23 may be formed in a concave cup shape or have a bent structure. Or, it may include a groove or a hole recessed for engagement with the body 11, but is not limited thereto. The first light emitting chip 25 may be disposed in the concave cup shape, but is not limited thereto.

The first lead frame 21 and the second lead frame 23 are made of a metal material, for example, titanium (Ti), copper (Cu), nickel (Ni), gold (Au), chromium (Cr), and tantalum. It may include at least one of aluminum (Ta), platinum (Pt), tin (Sn), silver (Ag), and phosphorus (P), and may be formed in a single layer or multiple layers.

The first light emitting chip 25 may be disposed on the first lead frame 21, and the first light emitting chip 25 may be bonded onto the first lead frame 21 by a bonding member. The first light emitting chip 25 may be connected to at least one of the first and second lead frames 21 and 23 by the connecting member 27, but is not limited thereto. The connection member 27 may include a wire of conductive material, for example, metal.

The first light emitting chip 25 may emit a first peak wavelength. For example, the first light emitting chip 25 may emit a blue peak wavelength, for example, a peak wavelength in the range of 430 nm to 460 nm.

The first light emitting chip 25 may include at least one of a II-VI compound and a III-V compound. The first light emitting chip 25 may be formed of, for example, a compound selected from the group consisting of GaN, AlGaN, InGaN, AlInGaN, GaP, AlN, GaAs, AlGaAs, InP, and mixtures thereof.

A molding member 41 may be disposed in the cavity, and the molding member 41 may include the phosphor composition 30 and the resin according to the embodiment. In this case, the resin may be any one of a silicone resin, an epoxy resin, an acrylic resin, or a mixture of two or more thereof.

The phosphor composition 30 may include phosphors emitting different peak wavelengths, and may include a phosphor composition to be described later.

The phosphor composition 30 may include, for example, a first phosphor 31 and a second phosphor 32 emitting different peak wavelengths. The first phosphor 31 may include one or two or more kinds of phosphors, for example, a green light emitting a first peak wavelength, for example, green light, using the peak wavelength emitted from the first light emitting chip 25 as an excitation wavelength. It may include a phosphor. In addition, the second phosphor 32 may include one or two or more kinds of phosphors. For example, the second phosphor 32 emits a second peak wavelength, for example, red light, using the peak wavelength emitted from the first light emitting chip 25 as an excitation wavelength. The red phosphor may include, but is not limited thereto.

On the other hand, as described above, the solution to improve the color gamut of the conventional LED is to move the light emission wavelength of the green phosphor and the red phosphor to a deeper (Fig. 1), β- which is a conventional green phosphor Since the emission wavelength of SiAlON does not move to a short wavelength, there is a problem that it is difficult to improve color reproducibility more than currently available.

The present invention provides a phosphor composition including a green phosphor having a perovskite structure to solve the above problems. The range of the center peak representing the maximum intensity of the light emission wavelength of the green phosphor according to an embodiment of the present invention may be greater than or equal to 505 nm and less than or equal to 520 nm.

In addition, the half width of the green phosphor according to an embodiment of the present invention is 25 nm or more and 30 nm or less, and has a narrow half width corresponding to 50% of 54 nm, which is the half width of the β-SiAlON, which is a conventional green phosphor. The color purity of the display product using the light emitting element can be significantly improved.

Such a green phosphor has a structure represented by the following formula (1).

 [Formula 1]

Cs _α Rb _{1 - α} AX ₃

(Where 0 <α <1, A is a Group 4A metal and X is a halogen group element)

At this time, when α is 0, the light emission peak is shifted to the blue region, thereby obtaining a pure green color. On the other hand, when α is 1, the intensity of the light emitting peak is reduced by half, thereby decreasing the color rendering index. More preferably, a may be greater than or equal to 0.45 and less than or equal to 0.55, because in this case, the half-value width is narrow and pure green is realized, and the intensity and intensity of the emission peak are increased to increase luminance and color rendering index. .

On the other hand, the phosphor of the perovskite structure that emits light of the green wavelength by the blue excitation light is preferably used mixed with an organic solvent such as toluene, benzene, xylene due to unstable optical properties. However, when the phosphor and the organic solvent are mixed in this way, the molding member 41 may not be cured or cured due to the action of the resin and the organic solvent of the molding member 41 when the light emitting device package 100 is manufactured. There is a problem that the luminous flux of the light emitting device package is reduced, thereby reducing reliability.

However, in one embodiment of the present invention by providing a green phosphor having a powdery perovskite structure can solve the above problems by the organic solvent, high color reproduction is possible due to the narrow half-width of the green phosphor.

Powdered green phosphors can be obtained by mixing, stirring, filtration and drying the soluble green phosphor in which the green phosphor is immersed in an organic solvent and the spherical silica particles having mesoporous pores.

Stirring may be performed at room temperature for 20 hours or more and 30 hours or less, and the green phosphor may be supported in the pores of the mesoporous spherical silica through such stirring.

Thereafter, the mesoporous spherical silica loaded with green phosphor is separated from the organic solvent through filtration, and dried at a temperature of 50 ° C. or higher and 70 ° C. or lower for 4 hours or more and 9 hours or less, A powdery green phosphor can be obtained.

Hereinafter, the present invention will be described in more detail with reference to an embodiment and a comparative example.

Powder type Cs ₀ , which is a β-SiAlON green phosphor most used in a conventional BLU white light source for display and a green phosphor included in a phosphor composition according to an embodiment of the present invention _{. 5} Rb _{0 .} The emission wavelength of ₅ PbBr ₃ was measured, and the center peak (Wp) and half width were measured and shown in Table 1.

Cs _{0 . 5} Rb _{0 . The 5} PbBr ₃ phosphor was obtained by cooling and purifying the phosphor obtained by synthesizing CsCO ₃ , RbCO ₃ and PbBr ₂ , followed by stirring, filtration and drying for 24 hours in a toluene solvent with mesoporous silica.

Phosphor Wp (nm) Half width (nm) β-SiAlON 543 54 Cs _{0 . 5} Rb _{0 . 5} PbBr ₃ 515 25

Referring to Table 1 and FIG. 3, β-SiAlON has a center peak of 543 nm and a half width of 54 nm, and it is difficult to reproduce pure green. Referring to Figure 4, it can be seen that the excitation wavelength of β-SiAlON shows a peak in the range of 380nm or more to 420nm or less.

Meanwhile, FIG. 5 shows Cs _{0 . 5} Rb _{0 . As a} graph showing a light emission wavelength of ₅ PbBr ₃ , the center peak (Wp) of the phosphor is 515 nm, and a half width of 25 nm corresponding to half of β-SiAlON is shown, thereby improving color gamut than β-SiAlON.

6, Cs _{0 . 5} Rb _{0 .} The excitation wavelength of ₅ PbBr ₃ appears to have a peak in the range of 350 nm or more and 375 nm or less.

That is, the green phosphor represented by the following Chemical Formula 1 has a narrow half-value width in comparison with the conventional commercial green phosphor, and thus it is possible to implement a light emitting peak showing a short wavelength, and thus it is confirmed that the color reproducibility can be remarkably improved when applied to display products. Can be.

[Formula 1]

Cs _α Rb _{1 - α} AX ₃

(Where 0 <α <1, A is a Group 4A metal and X is a halogen group element)

On the other hand, Figure 7 is a graph showing the emission wavelength of the green phosphor obtained by adjusting the ratio of Cs and Rb of the green phosphor represented by the formula (1) as shown in Table 2.

Experimental Example 1 Experimental Example 2 Experimental Example 3 Experimental Example 4 Experimental Example 5 Cs (wt%) 100 80 60 40 20 Rb (wt%) 0 20 40 60 80

Referring to FIG. 7, as the ratio of Cs decreases, the center peak moves to a shorter wavelength as the ratio of Rb increases, and the color rendering index is decreased because the intensity of the center peak decreases as the ratio of Rb is higher than Cs. It can be expected to decrease. Meanwhile, as described above, the present invention provides a phosphor composition including a green phosphor having a perovskite structure represented by Chemical Formula 1.

The phosphor composition may further include a KSF-based red phosphor represented by Formula 2, and the phosphor may have a light emission peak of 625 nm or more and 640 nm and a half width of 5 nm or more and 9 nm or less.

[Formula 2]

A ₂ M _{1 - x} F ₆ : Mn ^{4 +} _x

Here, A is at least one alkali metal selected from lithium (Li), sodium (Na), potassium (K), rubidium (Rb) and cesium (Cs), and M is a group consisting of Group 4 or 14 elements. Is at least one element selected from, and x satisfies 0 <X ≦ 0.2.

The phosphor composition including the green phosphor and the red phosphor described above may implement white light by a blue light source.

In this case, when a nitride phosphor such as a CASN-based or SCASN-based phosphor, which is not a KSF-based phosphor, is used as the red phosphor in the phosphor composition of the present invention, the green phosphor represented by Formula 1 and wavelength reabsorption and interference are greatly generated. There is a problem that the color reproducibility is significantly reduced.

On the other hand, in the case of using the green phosphor represented by the formula (1) and the KSF-based phosphor represented by the formula (2), such a wavelength re-absorption and interference phenomenon is insignificant, so that the problem of lowering the color reproducibility does not occur, the phosphor composition of the present invention It is preferable to use the red phosphor represented by the formula (2) as the red phosphor.

In this case, the green phosphor is preferably 20% or more and 40% or less, and the red phosphor is preferably 60% or more and 80% or less. When the green phosphor and the red phosphor are included within this content range, it is possible to realize an excellent color reproduction rate without causing a problem of light efficiency reduction due to optical interference between the phosphors.

On the other hand, when the content range of the green phosphor and the red phosphor is outside the above range, the light emitted by the phosphor is absorbed by the other phosphor by the wavelength interference of the two phosphors, so that the light efficiency is drastically reduced, and the content of one phosphor is excessively increased. Increasingly, the balance between green and red light emission intensity is poor, which leads to a significant reduction in color reproduction.

When the phosphor composition is applied to the light emitting device package 100 described above, the phosphor composition may be included in an amount of 10 wt% or more to 30 wt% or less with respect to 100 wt% of the resin included in the molding member 41.

8 to 11 illustrate Cs _{0 . 5} Rb _{0 . 5} shows the color coordinates of the light emitting device package 100 including PbBr ₃ or β-SiAlON.

The light emitting device package 100 emits light on the package body 11 and the first light emitting chip 25 and the second wavelength region, which are disposed on the package body 11 and have the first wavelength region as the emission wavelength. A second light emitting chip 26 having a wavelength, a molding member 41 disposed on the first and second light emitting chips 25 and 26, a first phosphor 31 disposed in the molding member 41, and A phosphor composition 30 including a second phosphor 32.

At this time, a blue light emitting chip was applied as the first light emitting chip 25, and the powder type Cs _{0 . 5} Rb _{0 . 5} PbBr ₃ or β-SiAlON was applied, and a red phosphor, K ₂ SiF ₆ : Mn ^{4 +} (KSF) phosphor, was applied as the second phosphor 32.

The molding member 41 was manufactured by mixing 18 wt% of the phosphor composition 30 with respect to 100 wt% of silicon, and the phosphor composition 30 used was a mixture of green phosphor and red phosphor in a ratio of 3: 7.

As an example, the light emitting device package 100 including Cs _0.5 Rb _0.5 PbBr ₃ , which is a green phosphor included in the phosphor composition according to an exemplary embodiment, is measured by using the light emitting device package 100 including β-SiAlON as a comparative example. One color coordinate is shown in FIGS. 8 to 11. 8 shows color coordinates in the CIE 1931 color gamut of the NTSC standard, FIG. 9 shows color coordinates in the CIE 1976 color gamut of the NTSC standard, FIG. 10 shows color coordinates in the CIE 1931 color gamut of the BT2020 standard. 11 shows color coordinates in the CIE 1976 color gamut of the BT2020 standard.

8 to 11, the color coordinate area of the embodiment appears wider than the color coordinate area of the comparative example regardless of the type of the standard and the color gamut. In addition, it can be seen that the color reproducibility of the light emitting device package to which the green phosphor of the embodiment is applied is much superior to that of the conventional β-SiAlON phosphor, from the fact that the red wavelength of the embodiment appears to be longer and the green wavelength is shorter.

This can be confirmed from the fact that the overlap ratio between the color coordinates of the embodiment and the area corresponding to the NTSC or BT2020 as the color coordinates is wider than that of the comparative example.

Next, the color coordinates of Examples and Comparative Examples were digitized and described in Tables 3 to 5 below.

Table 3 is a table showing optical characteristics when the light emitting device package is applied to a BLU (Back light unit).

Cx Cy u ' v ' Comparative example 0.248 0.217 0.1943 0.3822 Example 0.246 0.211 0.1948 0.3769

Table 4 is a table showing color coordinates when the light emitting device package is applied to a liquid crystal module (LCM).

division Comparative example Example x y u ' v ' x y u ' v ' Red 0.667 0.315 0.4904 0.5204 0.687 0.302 0.5239 0.5177 green 0.262 0.693 0.0971 0.5778 0.129 0.771 0.0429 0.5786 blue 0.154 0.043 0.1921 0.1214 0.149 0.069 0.1693 0.1751 White 0.252 0.234 0.1900 0.3970 0.260 0.251 0.1892 0.4114

Table 5 below is a table showing the area of the color coordinates shown in FIGS. 8 to 11 and calculating the area ratio.

unit:% Comparative example Example CIE 1931 CIE 1976 CIE 1931 CIE 1976 LCM / NTSC 96.04 116.95 121.08 125.22 Overlap / sRGB 99.82 99.31 99.71 98.81 Area ratio / sRGB 135.6 134.13 170.95 143.61 Overlap / DCI 96.72 96.59 93.38 95.58 Overlap / BT2020 71.36 76.03 86.05 82.28 Area ratio / BT2020 71.71 77.84 90.41 83.34

Here, the liquid crystal module (LCM) is a standard standard of a liquid crystal display module, and the digital cinema initiatives (DCI) are a standard standard of a digital cinema. Overlap / standard represents the color coordinate overlap ratio of each standard coordinate and the embodiment and the comparative example in the color gamut, and area ratio / standard means the color coordinate area ratio of each standard coordinate and the embodiment and the comparative example in the gamut. Referring to Table 5, when the NTSC standard, the sRGB standard and the BT2020 standard are applied, the area ratio of the embodiment is much larger than that of the comparative example. In the NTSC standard or the sRGB standard, the overlap ratios of the examples and the comparative examples were similar, but when the BT2020 standard, the overlap ratios of the examples were higher.

In particular, the area ratio of the NTSC standard in the CIE1931 color gamut was 96.04% in the comparative example and 121.08% in the example, and the embodiment showed about 25% more area ratio, and the CIE 1976 color gamut when the BT2020 standard was applied. Is about 6% and about 15% in the CIE 1931 color gamut, the display device to which the phosphor composition including the green phosphor according to an embodiment of the present invention is applied may increase the range of color, thereby enabling high color reproduction. .

On the other hand, Figure 12 shows the emission spectrum of the embodiment. Referring to FIG. 12, the embodiment has a lower intensity of a blue wavelength having a peak at about 450 nm and a higher intensity of a red wavelength and a green wavelength having a peak at about 635 nm than a comparative example. That is, the emission intensity of each color is relatively leveled, and thus, pure white can be realized.

In addition, the embodiment may implement a pureer green since the peak of the green wavelength is shifted from about 540 nm to about 520 nm, and the half width is reduced by about half compared to the comparative example, and thus may exhibit higher color reproduction. .

Such a high color reproducibility can be realized because it includes the green phosphor represented by the formula (1). In addition, since the green phosphor is processed and used in a powder form, there is no problem of deterioration of optical characteristics due to a solvent by using the powder form, and a light emitting device package capable of high color reproduction can be provided.

On the other hand, Figure 13 shows the CIE distribution range of the Example and Comparative Example. In the case of the examples, it was confirmed that Cx has a range of 0.25 to 0.27, Cy has a range of 0.24 to 0.27.

Meanwhile, a plurality of light emitting device packages according to the present invention described above may be arranged on a substrate, and a light guide plate, a prism sheet, a diffusion sheet, or the like, which is an optical member, may be disposed on an optical path of the light emitting device package.

In addition, it may be implemented as a light source device including a light emitting device package according to the present invention.

In addition, the light source device includes a light source module including a substrate and a light emitting device package according to the present invention, a radiator for dissipating heat from the light source module, and a power supply unit for processing or converting an electrical signal provided from the outside and providing the light source module to the light source module. It may include. For example, the light source device may include a lamp, a head lamp, or a street lamp. In addition, the light source device according to the embodiment may be variously applied to a product requiring light to be output.

In addition, the light source device includes a bottom cover, a reflector disposed on the bottom cover, a light emitting module emitting light and including a semiconductor element, a light guide plate disposed in front of the reflector and guiding light emitted from the light emitting module to the front; An optical sheet including prism sheets disposed in front of the light guide plate, a display panel disposed in front of the optical sheet, an image signal output circuit connected to the display panel and supplying an image signal to the display panel, and disposed in front of the display panel It may include a color filter. The bottom cover, the reflector, the light emitting module, the light guide plate, and the optical sheet may form a backlight unit.

As another example of the light source device, the head lamp includes a light emitting module including a light emitting device package disposed on a substrate, a reflector reflecting light emitted from the light emitting module in a predetermined direction, for example, a front, and reflected by the reflector. It may include a lens for refracting the light forward, and a shade for blocking or reflecting a portion of the light reflected by the reflector toward the lens to achieve a light distribution pattern desired by the designer.

An embodiment of the present invention described above is not limited to the above-described embodiment and the accompanying drawings, it is possible that various substitutions, modifications and changes within the scope of the technical spirit of the embodiment is possible It will be apparent to those of ordinary skill in the art to which an embodiment belongs.

100: light emitting device package
11: body
21: first lead frame
23: second lead frame
25: light emitting element
27: connecting member
30: phosphor composition
31: first phosphor
32: second phosphor
41: molding member

Claims (12)

A phosphor composition comprising a green phosphor having a perovskite structure represented by the formula (1).
[Formula 1]
Cs _α Rb _{1 - α} AX ₃
(Where 0 <α <1, A is a Group 4A metal and X is a halogen group element) The method of claim 1,
A is 0.45 or more and 0.55 or less. The method of claim 1,
The center peak of the emission wavelength of the green phosphor is 505nm or more and 520nm or less, the half width is 25nm or more and 30nm or less. The method of claim 1,
A phosphor composition further comprising a KSF-based red phosphor represented by Chemical Formula 2 and implementing white light by a blue light source.
[Formula 2]
A ₂ M _{1 - x} F ₆ : Mn ^{4 +} _x
Here, A is at least one alkali metal selected from lithium (Li), sodium (Na), potassium (K), rubidium (Rb) and cesium (Cs), and M is a group consisting of Group 4 or 14 elements. Is at least one element selected from, and x satisfies 0 <X ≦ 0.2. The method of claim 3,
A phosphor composition comprising 20wt% or more and 40wt% or less of the green phosphor and 60wt% or more and 80wt% or less of the red phosphor. The method of claim 1,
The green phosphor is a powder composition phosphor. Body;
A first light emitting chip disposed on the body;
A molding member disposed on the first light emitting chip; And
And a phosphor composition disposed in the molding member.
The phosphor composition includes a light emitting device package comprising a green phosphor having a perovskite structure represented by the formula (1).
[Formula 1]
Cs _α Rb _{1 - α} AX ₃
(Where 0 <α <1, A is a Group 4A metal and X is a halogen group element) The method of claim 7, wherein
Wherein a is 0.45 or more and 0.55 or less. The method of claim 7, wherein
The center peak of the emission wavelength of the green phosphor is 505nm or more and 520nm or less, the half-value width is 25nm or more and 30nm or less. The method of claim 7, wherein
A light emitting device package further comprising a KSF-based red phosphor represented by Formula 2 and implementing white light by a blue light source.
[Formula 2]
A ₂ M _{1 - x} F ₆ : Mn ^{4 +} _x
Here, A is at least one alkali metal selected from lithium (Li), sodium (Na), potassium (K), rubidium (Rb) and cesium (Cs), and M is a group consisting of Group 4 or 14 elements. Is at least one element selected from, and x satisfies 0 <X ≦ 0.2. The method of claim 7, wherein
A light emitting device package comprising 20 wt% or more and 40 wt% or less of the green phosphor and 60 wt% or more and 80 wt% or less of the red phosphor. The method of claim 7, wherein
The green phosphor is a powder type light emitting device package.

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