KR20130050459A - Phosphor coating matrix using globular ppm and lighting device using the same - Google Patents

Abstract

PURPOSE: A lighting device is provided to reduce the diffuser beads contents in the resin; to reduce the CIE(Identical Color Coordinate), CRI, and the content of fluorescent substance to the flux; and to reduce the color coordinate failure rate depending on the thickness deviation. CONSTITUTION: A light excimer is formed with the light-transmissive material, and comprises a hemispheric parent(110) and a plurality of diffusate(111). The hemispheric parent forms an opening part in the lower part to cover the light emitting device, and includes at least one fluorescent substance. The hemispheric parent comprises the light-transmissive material Polymer which is able to transmit the light emitted from the light emitting device, and forms a mixing space in the internal space. The diffusate is formed in the hemispheric shape in the inner side of the parent, and is comprised of one among the UV resin, and the resin of the acryl, silicon, and urethane.

Description

Optical excitation using spherical PPM and lighting device using the same {{PHOSPHOR COATING MATRIX USING GLOBULAR PPM AND LIGHTING DEVICE USING THE SAME}

Embodiments relate to an optical exciter using a globular PPM (Phosphor Polymer Matrix) and a lighting device using the same.

In general, a light emitting diode (LED) is a semiconductor device capable of realizing various colors by forming a light emitting source using a compound semiconductor material such as GaAs, AlGaAs, GaN, InGaN, and AlGaInP. Say.

Criteria for determining the characteristics of the LED device include high output light emission, luminance, emission color range, and the like. The characteristics of the LED device are primarily determined by the compound semiconductor material used in the LED device. It is also greatly affected by the structure of the package for mounting the chip. In order to obtain high luminance and luminance angle distribution according to user's demands, the primary factor due to material development is limited.

The light excitation body used in the conventional lighting device transmits and diffuses light generated from the LED package, and serves to excite light of a specific color emitted from the LED package. Such a conventional optical excitation body has a hemispherical shape having an opening at a lower portion thereof, and is formed by a PPM (Phosphor Polymer Matrix) method or a PCM (Phosphor Coating Matrix) method. Here, the PPM method is a method of forming by injection using a polymer containing a phosphor (Phosphor), the PCM method is a method of forming a coating layer containing a phosphor on a polymer substrate.

The optical excitons formed by the conventional PPM method increase the content of diffuser beads in the resin, increase the phosphor content relative to the CRI and the light flux in the same color coordinate (CIE), and the color coordinate (CIE) according to the thickness variation. There is a problem that the defective rate increases.

United States Patent Application Publication No. 2011/0095686 (2011.04.28) Korean Patent Publication No. 2009-0040968 (2009.04.28)

In order to solve the above problems, an embodiment of the present invention provides an optical excitation using a globular PPM having a micro structure that helps to mix and scatter a blue light source. The present invention relates to a sieve and a lighting device using the same.

In addition, another technical problem to be achieved by the embodiment is to propose an optical excitation using a spherical PPM that can reduce the content of diffuser beads in the resin (Resin) and an illumination device using the same.

Another object of the present invention is to provide an optical exciter using a spherical PPM and a lighting device using the same, which can reduce a color coordinate (CIE) defect rate due to thickness variation.

In addition, another technical problem to be achieved by the embodiment is to propose an optical excitation using a spherical PPM that can reduce the content of the phosphor relative to the same color coordinate (CIE), CRI and luminous flux, and an illumination device using the same.

The solution to the problem of the present invention is not limited to those mentioned above, and other solutions not mentioned can be clearly understood by those skilled in the art from the following description.

As a means for solving the above-described technical problem, the optical excitation body of the embodiment is formed of a light-transmissive material, the hemispherical matrix containing the phosphor, and at least one of the inner surface and the outer surface of the matrix It includes a plurality of diffusers integrally formed on the surface.

Here, the diffuser may be embossed or engraved, and may be formed in any one of a shape including a hemispherical shape, a polygonal pillar shape, a polygonal horn shape, and a plurality of curved shapes. In addition, the diffuser may be composed of any one of a UV resin (Resin) or an acrylic, silicone, urethane-based resin.

The diffusion body may be formed in plural on the outer surface of the mother body, and may have the same material as the mother body.

In addition, the diffusion body may be formed in plural on the inner surface of the mother body, and may have the same material as the mother body.

In addition, the diffusion body may be formed in plural on the inner side and the outer side of the mother, respectively, and the diffusions formed on the inner side and the outer side are alternately formed, and may have the same material as the base.

The light transmissive material includes a polymer, and the polymer may include polycarbonate (PC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), acrylic resin, and polystyrene. PS) and polymethyl methacrylate (PMMA).

The optical excitons are sized by the relationship C = B = α × D, A = β × C, where A is the inner diameter of the optical exciter, B is the light source from the light source to the top of the outline The height, C is the opening diameter of the optical exciter in which the light source is arranged, D is the diameter between the light sources facing each other, and α and β are constant.

Here, α has a range of 2 to 2.2, the β may have a range of 1.1 to 1.2, the α is 2.12, β is preferably a constant value of 1.15.

The distance between the diffuser and the center of the diffuser may range from 2500 μm to 3000 μm, and the radius R value of the diffuser may range from 560 μm to 800 μm.

The matrix may further include a diffusion material for diffusing light.

In addition, as a means for solving the above technical problem, the lighting apparatus of the embodiment may be configured to include the optical excitation body.

According to the embodiment, it is possible to reduce the content of diffuser beads (Resin) in the resin, to reduce the phosphor content relative to the same color coordinate (CIE), CRI and luminous flux, and to reduce the color coordinate defect rate due to thickness variation It can be effective.

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

1 is a cross-sectional view of an optical exciter using a spherical PPM according to the first embodiment
2 is a cross-sectional view of an optical exciter using a spherical PPM according to a second embodiment.
3 is a cross-sectional view of an optical exciter using a spherical PPM according to a third embodiment.
4 is a diagram illustrating a method of calculating the size of an optical excitation body according to the first to third embodiments;
FIG. 5 is a simulation graph for determining a range of the constant α in the calculation relation of the optical excitation body according to FIG. 4.
FIG. 6 is a simulation graph for determining the range of the constant β in the calculation relation of the optical excitation body according to FIG. 4.
7 shows an example of the size of an optical excitation body;
8 is a partially enlarged view of an optical exciter according to the first to third embodiments
FIG. 9 is an experimental graph showing a first experimental result of an optical exciter according to the first to third embodiments. FIG.
FIG. 10 is an experimental graph showing a second experiment result of the optical excitation body according to the first to third embodiments. FIG.

The thickness and size of each layer in the drawings are exaggerated, omitted, or schematically shown for convenience and clarity of explanation. In addition, the size of each component does not necessarily reflect the actual size.

In the description of the embodiment according to the present invention, when described as being formed on the "on or under" of each element, the (up) or down (on) or under) includes both two elements being directly contacted with each other or one or more other elements are formed indirectly between the two elements. Also, when expressed as "on or under", it may include not only an upward direction but also a downward direction with respect to one element.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

First Embodiment

1 is a cross-sectional view of an optical exciter using a spherical PPM according to the first embodiment.

As shown in FIG. 1, the optical excitation body according to the first embodiment is formed of a light-transmissive material, and has a hemispherical matrix 100 including phosphors, and an outer surface of the matrix 100. It includes a plurality of diffusers 101 formed integrally with the.

The hemispherical matrix 100 has an opening formed at a lower portion thereof to surround the light emitting device (not shown), and includes at least one phosphor. In addition, the hemispherical matrix 100 includes a polymer of a light-transmissive material that can transmit light emitted from the light emitting device.

The polymer may include polycarbonate (PC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), acrylic resin, polystyrene (PS), polymethyl methacrylate. Rate (Polymethyl methacrylate: PMMA) may be any one from the group consisting of. In particular, the hemispherical matrix 100 may be made of polycarbonate (PC) when heat resistance and chemical resistance are required.

The hemispherical matrix 100 may be manufactured by using a metal injection molding method by mixing a light-transmissive plastic and phosphors. At this time, when forming the hemispherical matrix 100, a plurality of diffusers 101 are also integrally formed on the outer surface of the matrix 100.

The diffuser 101 is formed in a hemispherical shape on the outer surface of the matrix 100, but is composed of a variety of embossed or intaglio shapes, such as polygonal pillar shape, polygonal horn shape, a plurality of bent shape Can be.

The diffuser 101 is integrally formed with the same material as the hemispherical matrix 100 and may be composed of any one of a UV resin or an acrylic resin, a urethane resin, or a urethane resin.

The hemispherical matrix 100 serves to diffuse light as well as transmit light. For example, the hemispherical matrix 100 may be composed of a transparent diffuser plate or a transparent substrate including a diffuser. Here, the diffusion agent is silicon oxide (SiO 2), titanium oxide (TiO 2), zinc oxide (ZnO), barium sulfate (BaSO 4), calcium carbonate (CaSO 4), magnesium carbonate (MgCO 3), aluminum hydroxide (Al (OH) 3) ), Synthetic silica, glass beads, and diamond, but may not be limited thereto. In addition, the particle size of the diffusion agent may be selected to a size suitable for the diffusion of light, for example, may have a diameter of 5 ~ 7μm.

Subsequently, the hemispherical matrix 100 has a mixing space formed in the internal space. The mixing space means a space in which light emitted from the light emitting device is mixed.

In addition, the hemispherical matrix 100 has at least one phosphor. The phosphor serves to excite the light emitted from the light emitting device. The phosphor may include, for example, at least one of silicate series, sulfide series, YAG series and TAG series, and Nitride series.

In addition, the phosphor may include at least one of yellow, red, green, and blue phosphors emitting yellow, red, green, and blue light, but the type of the phosphor is not limited.

The optical exciter emits light of different wavelengths in response to the wavelength of the incident light according to the color of the phosphor. Therefore, light of a required wavelength or color can be obtained from the illumination device according to the combination of the color of the light emitting element and the phosphor color.

Meanwhile, CaS: Eu may be used as the phosphor as a representative sulfide-based inorganic phosphor for emitting deep red light. At least one of SrS: Eu and MgS: Eu of the sulfide series may be used as the orange phosphor. As the green phosphor, sulfide-based SrGa2S4 and Eu2 + can be used.

The phosphor may include different kinds and amounts depending on the light emitting device. For example, when the light emitting device emits white light, the hemispherical matrix 100 may include green and red phosphors. In addition, when the light emitting device emits blue light, green, yellow, and red phosphors may be included. As such, the type and amount of the phosphor included in the hemispherical matrix 100 may vary according to the type of the light emitting device.

Meanwhile, the hemispherical matrix 100 may further include at least one or more of a diffusing agent, an antifoaming agent, an additive, and a curing agent.

The diffusing agent diffuses light by scattering light incident on the hemispherical matrix 100. Examples of the diffusion agent include silicon oxide (SiO 2), titanium oxide (TiO 2), zinc oxide (ZnO), barium sulfate (BaSO 4), calcium carbonate (CaSO 4), magnesium carbonate (MgCO 3), aluminum hydroxide (Al (OH)). 3), but may include at least one or more of synthetic silica, glass beads, diamond.

The antifoaming agent can secure the reliability by removing the bubbles in the hemispherical matrix (100). In particular, when the hemispherical matrix 100 is manufactured using a metal injection molding method, bubbles may be solved. Examples of the antifoaming agent may include, but are not limited to, at least one of octanol, cyclohexanol, ethylene glycol, or various surfactants.

The curing agent serves to cure the hemispherical matrix 100.

The additive serves to evenly disperse the phosphor in the hemispherical matrix 100.

Such photoexcitation changes the wavelength of light emitted from the light emitting device. Accordingly, the optical excitation body is applied to light sources such as various lighting devices, backlight units, light emitting devices, and display devices, and used to generate light having various wavelengths, or to improve color rendering index (CRI) of the light source. It can be used for such purposes.

Accordingly, the optical excitation body according to the first embodiment forms a hemispherical matrix 100 by metal injection molding by mixing a light-transmissive resin and phosphors. The technical problem of the present invention can be solved by integrally forming the plurality of diffusers 101 on the outer surface of the matrix 100.

Second Embodiment

2 is a cross-sectional view of an optical exciter using a spherical PPM according to a second embodiment.

As shown in FIG. 2, the optical excitation body according to the second embodiment is formed of a light-transmissive material, and has a hemispherical matrix 110 including phosphors, and an inner surface of the matrix 110. It includes a plurality of diffusers 111 formed integrally with the. The optical excitation body according to the second embodiment is different from the first embodiment in that the plurality of diffusers 111 are formed on the inner surface of the hemispherical matrix 110.

Like the first embodiment, the hemispherical matrix 110 has an opening formed at a lower portion thereof to surround the light emitting device, and includes at least one phosphor. In addition, the hemispherical matrix 110 includes a polymer made of a light-transmissive material that can transmit light emitted from the light emitting device. In addition, the hemispherical matrix 110 has a mixing space formed in the internal space.

The hemispherical matrix 110 may be manufactured by using a metal injection molding method by mixing a light-transmissive plastic and phosphors. In this case, when the hemispherical matrix 110 is formed, a plurality of diffusers 111 are also integrally formed on the inner surface of the matrix 110.

The diffuser 111 is formed in the hemispherical shape on the inner surface of the matrix 110, but is composed of a variety of embossed or intaglio shapes, such as a polygonal pillar shape, a polygonal horn shape, a shape having a plurality of bends Can be.

The diffuser 111 may be integrally formed of the same material as the hemispherical matrix 110 and may be formed of any one of a UV resin or an acrylic resin, a silicone resin, and a urethane resin.

Like the first embodiment, the hemispherical matrix 110 includes at least one phosphor, and may include one or more of a diffusing agent, an antifoaming agent, an additive, and a curing agent.

Accordingly, the optical excitation body according to the second embodiment forms a hemispherical matrix 110 by metal injection molding by mixing a light-transmissive resin and phosphors. The technical problem of the present invention can be solved by integrally forming the plurality of diffusers 111 on the inner surface of the matrix 110.

Third Embodiment

3 is a cross-sectional view of an optical exciter using a spherical PPM according to the third embodiment.

As shown in FIG. 3, the optical excitation body according to the third embodiment is formed of a light-transmissive material and includes a hemispherical matrix 120 including phosphors, an inner surface of the matrix 120, and A plurality of diffusers 121 integrally formed on the outer surface is included. In this case, the diffuser 121 formed on the inner side and the diffuser 121 formed on the outer side are alternately formed.

The optical excitation body according to the third embodiment is different from the first and second embodiments in that the plurality of diffusers 121 are formed on the inner and outer surfaces of the hemispherical matrix 120.

Like the first embodiment, the hemispherical matrix 120 has an opening formed at a lower portion thereof to surround the light emitting device, and includes at least one phosphor. In addition, the hemispherical matrix 120 includes a polymer made of a light-transmissive material that can transmit light emitted from the light emitting device. In addition, the hemispherical matrix 120 has a mixing space formed in the internal space.

The hemispherical matrix 120 may be manufactured by using a metal injection molding method by mixing a light-transmissive plastic and phosphors. At this time, when the hemispherical matrix 120 is formed, a plurality of diffusers 121 are also integrally formed on the inner and outer surfaces of the matrix 120.

The diffusion body 121 is formed in the hemispherical shape on the inner surface and the outer surface of the parent 120, but the embossed or intaglio of various shapes such as polygonal pillar shape, polygonal horn shape, shape having a plurality of bends It may be configured in the form.

The diffuser 121 is integrally formed with the same material as the hemispherical matrix 120 and may be composed of any one of a UV resin or an acrylic resin, a silicone resin, and a urethane resin.

Like the first embodiment, the hemispherical matrix 120 includes at least one phosphor and may include one or more of a diffusing agent, an antifoaming agent, an additive, and a curing agent.

Therefore, the optical excitation body according to the third embodiment forms a hemispherical matrix 120 by metal injection molding by mixing a light-transmissive resin and phosphors. The technical problem of the present invention can be solved by integrally forming the plurality of diffusers 121 on the inner side and the outer side of the matrix 120.

ore Here  Size calculation method

4 is a diagram illustrating a method of calculating the size of an optical excitation body according to the first to third embodiments, and FIG. 5 is a simulation graph for determining a range of the constant α in the calculation relational formula of the optical excitation body according to FIG. 4. FIG. 6 is a simulation graph for determining a range of the constant β in the calculation relational formula of the optical excitation body shown in FIG. 4.

Referring to FIG. 4, the optical exciter 130 has a hemispherical shape and an opening for disposing a light source is integrally formed at a lower portion thereof. A light source module 140 is disposed in an opening of the optical exciter 130, and a plurality of light emitting elements 141 are disposed in a circle shape in the light source module 140. The optical excitation body 130 of FIG. 4 schematically shows a hemispherical matrix, and as in the first to third embodiments, a plurality of diffusers may be integrally formed on at least one of the inner side and the outer side. .

The size of the optical excitation body 130 may be calculated by the following relational expression.

C = B = α × D

A = β × C

Here, A is the inner diameter of the optical excitation body 130, B is the height from the light source to the top of the outer shape of the optical excitation body 130, C is the opening diameter of the optical excitation body 130, the light source is disposed, D represents diameters between light sources (light emitting elements) facing each other, and α and β represent constants, respectively.

In this case, α and β may be determined by the simulation results of FIGS. 5 and 6. That is, the α may have a range between 2 and 2.2, and has a highest light efficiency when it has a value of 2.12. In addition, the β may have a range between 1.1 and 1.2, and has a highest light efficiency when it has a value of 1.15.

7 is a view showing an example of the size of the optical excitation body.

As shown in FIG. 7, the optical excitation body has a hemispherical shape having an opening at a lower portion thereof, and the hemispherical inner diameter may be larger than a diameter of a portion (opening portion) opened at the lower portion thereof. For example, the hemispherical parent bodies 100, 110 and 120 may be formed to have an inner diameter of 25 mm, an open portion of a diameter of 22.3 mm, and a height of 22.4 mm.

Experimental Example

8 is a partially enlarged view of the optical excitation body according to the first to third embodiments, and shows the first embodiment as an example. 9 and 10 are experimental graphs showing first and second test results of the optical excitons according to the first to third embodiments.

In FIG. 8, it is assumed that the radius of the diffuser 101 is 'R', and the distance between the diffuser 101 and the center of the diffuser 101 is 'L'. At this time, the light emitting element uses a blue LED having a wavelength of 430 to 480 nm, and the phosphor includes yellow: 555 to 585 nm, green: 510 to 535 nm, and red: 510 to 535 nm.

FIG. 9 illustrates a distance L between the diffuser 101 and the center of the diffuser 101 in a state in which a radius R value of the diffuser 101 is fixed and the shape of the diffuser 101 is also fixed. Experiments were made with only the values changing.

As a result of the experiment, as can be seen from the graph of FIG. 9, the conversion efficiency (Conversion Efficacy) was the highest when the distance L value was in the range of 2500 μm to 3000 μm. Here, the conversion efficiency is the distance between the center of the diffuser 101 and the center of the diffuser 101 in a state where the radius R of the diffuser 101 and the shape of the diffuser 101 are fixed. As the (L) value changes, the light efficiency is output. As the conversion efficiency increases, the light efficiency increases and the color coordinate defect rate due to the thickness deviation may also decrease.

FIG. 10 illustrates a radius R between the diffuser 101 and the center of the diffuser 101 while fixing a distance L value and fixing the shape of the diffuser 101. Experiments were made with only the values changing.

As a result of the experiment, as shown in the graph of FIG. 10, the conversion efficiency (Conversion Efficacy) was the highest in the range of the radius (R) value of the diffusion body 101 between 560 μm and 800 μm. In this case, the conversion efficiency is determined by the distance L between the diffuser 101 and the center of the diffuser 101 and the shape of the diffuser 101 in a fixed state. As the radius R value changes, the light efficiency is output. As the conversion efficiency increases, the light efficiency increases and the color coordinate defect rate due to the thickness variation may decrease.

The optical excitation body and the lighting device using the same according to the embodiment configured as described above can solve the technical problem of the present invention by integrally forming a plurality of diffusers on one or both surfaces of the hemispherical matrix using PPM.

Although the above description has been made with reference to the embodiments, these are merely examples and are not intended to limit the present invention. Those skilled in the art to which the present invention pertains are not illustrated above without departing from the essential characteristics of the present embodiments. It will be appreciated that many variations and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

The optical excitation body according to the embodiment may be applied to an LED package, a lighting module, a lighting device, a back light unit (BLU), or the like.

100: hemispherical matrix 101: diffuser
110: hemispherical matrix 111: diffuser
120: hemispherical matrix 121: diffuser
130: optical excitation 140: light source module
141: light emitting element

Claims (17)

A hemispherical matrix formed of a light-transmissive material and including a phosphor; And
A plurality of diffusers integrally formed on at least one of an inner side and an outer side of the matrix;
Photoexcitation including the.
The method of claim 1,
The diffuser is an optical excitation in the form of an embossed or intaglio.
The method of claim 1,
The diffuser is formed of any one of a shape including a hemispherical shape, polygonal pillar shape, polygonal horn shape, a shape having a plurality of bends.
The method of claim 1,
The diffuser is an optical excitation body composed of any one of UV resin (resin) or acrylic, silicone, urethane resin.
The method of claim 1,
The diffusion body is formed in plural on the outer surface of the matrix, the optical excitation body having the same material as the matrix.
The method of claim 1,
The diffusing body is formed in plural on the inner surface of the matrix, the optical excitation body having the same material as the matrix.
The method of claim 1,
The diffusion body is formed in a plurality of inner and outer surfaces of the mother, respectively, the optical excitation body having the same material as the mother, the diffusion formed on the inner surface and the outer surface are formed alternately with each other.
The method of claim 1,
The light transmissive material includes a photopolymer.
The method of claim 9,
The polymer is polycarbonate (PC), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), acrylic resin, polystyrene (PS), polymethyl methacrylate (Polymethyl methacrylate). : Optical exciton of any one of PMMA).
The method of claim 1,
The optical excitons are sized by the relationship of C = B = α × D, A = β × C,
A is an inner diameter of the optical excitation body, B is a height from the light source to an upper portion of the outer shape of the optical excitation body, C is an opening diameter of the optical excitation body in which the light source is disposed, and D is a light source facing each other. The diameter between, wherein α and β are constants of optical excitation.
11. The method of claim 10,
Α has a range between 2 and 2.2,
Wherein β is in the range of 1.1 to 1.2.
11. The method of claim 10,
Α is 2.12,
Wherein β is 1.15.
The method of claim 1,
And a distance between the diffuser and the diffuser center is in a range between 2500 μm and 3000 μm.
The method of claim 1,
The radius (R) of the diffuser has an optical excitation having a range between 560 μm and 800 μm.
The method of claim 1,
The matrix further includes a diffusing material for diffusing light.
The method of claim 1,
The phosphor includes at least one or more of yellow, red, green and blue phosphors.
A lighting device comprising the optical exciter according to any one of claims 1 to 16.

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