KR101798569B1 - Lighting device - Google Patents

Abstract

An embodiment of the present invention relates to a lighting apparatus, and more particularly, to a lighting apparatus using an LED (Light Emitting Diode).
An apparatus according to an embodiment of the present invention includes a housing and a light source module housed in the housing, wherein the light source module includes a substrate, a light emitting element provided on the substrate, And a photoexcitation layer disposed adjacent to the phosphor layer and including a red phosphor.

Description

LIGHTING DEVICE

An embodiment of the present invention relates to a lighting apparatus, and more particularly, to a lighting apparatus using an LED (Light Emitting Diode).

Light emitting diodes (LEDs) are a type of semiconductor devices that convert electrical energy into light. The light emitting diode has advantages of low power consumption, semi-permanent lifetime, fast response speed, safety, and environmental friendliness compared with conventional light sources such as fluorescent lamps and incandescent lamps. Therefore, much research has been conducted to replace an existing light source with a light emitting diode, and a light emitting diode is increasingly used as a light source of a light unit such as a lamp, a display device, a display board, a streetlight,

Embodiments of the present invention provide an illumination device capable of improving the luminous intensity at a long wavelength.

Further, a lighting device capable of lowering the color temperature (CCT) is provided.

Further, it provides a lighting device capable of improving the color rendering index (CRI).

A lighting apparatus according to an embodiment of the present invention includes a housing and a light source module housed in the housing, the lighting apparatus comprising: a substrate; A light emitting element provided on the substrate; And a photoexcitation layer provided on the substrate and disposed adjacent to the light emitting element, the photoexcitation layer including a red phosphor.

The use of the illumination device according to the embodiment of the present invention has an advantage that the luminous intensity at a long wavelength can be improved.

Further, there is an advantage that the color temperature (CCT) can be lowered.

Further, there is an advantage that the color rendering index (CRI) can be improved.

1 is a perspective view of a lighting apparatus according to an embodiment of the present invention,
FIG. 2 is a perspective view of the light source module shown in FIG. 1,
3 is a cross-sectional view taken along line A-A 'in Fig. 2,
FIG. 4 is a graph of an intensity according to the wavelength of the illumination apparatus shown in FIG. 1, a graph of luminous intensity according to the wavelength of the illumination apparatus except for the light excitation layer in the illumination apparatus shown in FIG. 1,
5 is a perspective view of a lighting apparatus according to another embodiment of the present invention,
FIG. 6 is a perspective view of the photo excitation plate 150 shown in FIG. 5,
FIGS. 7 and 8 are cross-sectional views of B-B 'of the photo-excitation plate 150 shown in FIG. 6,
9 is a view showing the appearance of the coating layer when the substrate has no roughness and the appearance of the coating layer 153 having the roughness,
10 is an actual photograph of Fig. 9,
11 is a comparative photograph to confirm the adhesive performance of the photo excitation plate 150 shown in Fig.

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

In the description of the embodiment according to the present invention, in the case where it is described that any one element is formed on "on or under" another element, Or both on or under are those in which the two elements are in direct contact with each other or one or more other elements are indirectly formed 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.

Hereinafter, a lighting apparatus according to an embodiment of the present invention will be described with reference to the accompanying drawings.

1 is a perspective view of a lighting apparatus according to an embodiment of the present invention.

Referring to FIG. 1, a lighting apparatus according to an embodiment of the present invention may include a housing 110 and a light source module 130.

The housing 110 forms the appearance of a lighting device according to an embodiment of the present invention. The housing 110 houses the light source module 130 therein.

The inner wall of the housing 110 may be inclined differently from the outer wall. When the inner wall of the housing 110 has an inclination, the housing 110 can reflect the light directed to the inner wall of the housing 110 out of the light emitted from the light source module 130 in the upward direction in FIG. Therefore, it is preferable that the inner wall of the housing 110 is coated or deposited with a light reflecting material.

Preferably, the housing 110 is made of a material that can receive heat generated from the light source module 130 and emit it to the outside. For example, aluminum or an aluminum alloy is preferable.

The housing 110 may have a hole for the wire 170 to penetrate therethrough. The wire 170 transfers external power to the light source module 130.

The light source module 130 is accommodated in the housing 110. The light source module 130 is electrically connected to the wire 170 to receive power from the outside. More specifically, the light source module 130 will be described with reference to FIGS. 2 to 3. FIG.

FIG. 2 is a perspective view of the light source module shown in FIG. 1, and FIG. 3 is a sectional view taken along the line A-A 'in FIG.

2 to 3, the light source module 130 may include a substrate 131, a photo-excitation layer 133, and a light-emitting device 135.

The substrate 131 is mounted on the housing 110 and at least one light emitting device 135 is disposed on the substrate 131. On the substrate 131, a photoexcitation layer 133 is disposed.

Here, as shown in FIG. 4, a reflective layer 132 may be disposed between the substrate 131 and the photo-excited layer 133. That is, the reflective layer 132 may be disposed on the substrate 131 or a reflective material may be coated thereon.

The reflective layer 132 reflects light reflected from the light emitting element 135 directly or by another optical structure provided in the housing 110. The reflective layer 132 preferably has a reflectivity of 70% or more.

The reflective layer 132 may be coated on the substrate 131 or may be integral with the photo-excitation plate 133. Alternatively, the reflective layer 132 itself may be separately formed.

The substrate 131 may be formed of a material such as polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), acrylic resin, polystyrene (Polystyrene, PS), and the like. Here, when heat resistance and chemical resistance of the substrate 131 are required, the substrate 131 is preferably polycarbonate (PC).

The photoexcitation layer 133 is disposed on the substrate 131 and reflects light from the light emitting element 135 and has at least one phosphor 133-1. Specifically, the photoexcitation layer 133 is disposed on the substrate 131 between the plurality of light emitting elements 135 disposed on the substrate 131. [ Here, the photoexcitation layer 133 may be easily separated from the substrate 131, and may be coated on the substrate 131 to form an integral body with the substrate 131. Further, the photoexcitation layer 133 may be disposed on the inner wall of the housing 110.

The photo-excitation layer 133 may be formed of at least one of a resin material and a silicon material, and may preferably be a silicone resin (Silicone Resin).

The photoexcitation layer 133 has at least one phosphor 133-1. The phosphor 133-1 excites the light. The phosphor 133-1 may be incorporated in the coating layer 153 by being mixed with a liquid coating layer 153 and stirred using a stirrer, for example.

The phosphor 133-1 excites the light from the light emitting element 135 to emit the excited light. Here, the phosphor 133-1 may be any one of yellow, green, and red phosphors, but is most preferably a red phosphor. Therefore, the phosphor 133-1 is preferably a nitride-based phosphor and a sulfide-based phosphor. Here, CaS: Eu can be used as a typical sulfide-based inorganic phosphor.

On the other hand, the photoexcitation layer 133 may further include a yellow or green phosphor as well as a red phosphor 133-1. When a yellow or green phosphor is further included in the photoexcitation layer 133, the phosphor may be at least one of a silicate series, a sulfide series, a YAG series, and a TAG series. On the other hand, at least one of SrS: Eu and MgS: Eu of the sulfide series may be used as the yellow phosphor. As the green phosphor, SrGa2S4 and Eu2 + of the sulfide series can be used.

The photoexcitation layer 133 may further include at least one of a diffusing agent, an antifoaming agent, an additive, and a curing agent.

The diffusing agent can diffuse the light incident on the photoexcitation layer 133 by scattering. Examples of the diffusion agent include silicon oxide (SiO2), titanium oxide (TiO2), zinc oxide (ZnO), barium sulfate (BaSO4), calcium carbonate (CaSO4), magnesium carbonate (MgCO3) 3), synthetic silica, glass beads, and diamond. However, the present invention is not limited thereto.

The defoaming agent can ensure reliability by removing bubbles in the photoexcitation layer 133. Particularly, it is possible to solve the bubble problem which is a problem when the photo-excitation layer 133 is coated on the substrate 131 by the screen printing method. Examples of the antifoaming agent include, but are not limited to, at least one of octanol, cyclohexanol, ethylene glycol, and various surfactants.

The additive may be used to evenly disperse the phosphor 133-1 in the photoexcitation layer 133. [

On the other hand, the photoexcitation layer 133 may not be disposed on the substrate 131, but may be disposed on the inner wall of the housing 110.

FIG. 5 is a graph of intensity according to the wavelength of the illumination apparatus shown in FIG. 1, and a graph of luminous intensity according to the wavelength of the illumination apparatus except for the light excitation layer in the illumination apparatus shown in FIG.

5, the first curve 410 is an experimental result when a general optical plate is provided on the light source module 130 in the illuminating device shown in FIG. 4, and the second curve 450 is an experimental result when the light This is the experimental result when the excitation layer 133 is removed. That is, the two curves 410 and 450 shown in FIG. 4 are experimental graphs with and without the photo-excitation layer 133, respectively. The light emitting device 135 of the light source module 130 uses a general white light emitting diode. Here, the light emitting device 135 of the light source module 130 may use a blue light emitting diode as well as a white light emitting diode.

5, an illuminating device having a photoexcitation layer 133, that is, an illuminating device according to an embodiment of the present invention has a light intensity enhancement effect in a long wavelength which can not be confirmed in a general illuminating device without the photoexcitation layer 133 .

Further, it has been confirmed that the lighting apparatus according to the embodiment of the present invention has a lower color temperature (CCT) and a higher CRI than the general lighting apparatus.

Here, the graph of FIG. 5 can be expected to show similar experimental results even when the experiment is conducted with respect to the illumination apparatus shown in FIG. 4 or the illumination apparatus shown in FIG.

6 is a perspective view of a lighting apparatus according to another embodiment of the present invention.

The illumination device according to another embodiment of the present invention shown in FIG. 6 is the one in which the light excitation plate 150 is mounted on the housing 110 of the illumination device according to the embodiment of the present invention shown in FIG. Therefore, the remaining structures except for the photo-excitation plate 150 are the same as those shown in FIG. 1, and a description thereof will be omitted below. Hereinafter, the light guide plate 150 will be described in detail with reference to the drawings.

The light guide plate 150 is disposed at the upper end of the housing 110 and is disposed on the light source module 130. The light guide plate 150 excites light emitted from the light source module 130. That is, the wavelength of the light emitted from the light source module 130 is changed. The light guide plate 150 will be described in detail with reference to the accompanying drawings.

FIG. 7 is a perspective view of the photo-excitation plate 150 shown in FIG. 6, and FIGS. 8 and 9 are cross-sectional views taken along the line B-B 'of the photo-excitation plate 150 shown in FIG. 8 and 9 are different embodiments.

7 to 9, the photo-excitation plate 150 includes a base 151 and a coating layer 153. [

The base 151 is preferably made of a resin material that transmits light from the light emitting element. For example, it is possible to use polycarbonate (PC), polymethyl methacrylate (PMMA), polyethylene terephthalate (PET), polyethylene naphthalate (PEN), acrylic resin, polystyrene , PS), and the like. In particular, when heat resistance and chemical resistance of the base 151 are required, the base 151 is preferably made of polycarbonate (PC).

The base 151 can diffuse light as well as transmit light. For example, the base 151 may be a light diffusing plate or a light transmitting substrate containing a diffusing agent. Here, the diffusing agent may be, for example, silicon oxide (SiO2), titanium oxide (TiO2), zinc oxide (ZnO), barium sulfate (BaSO4), calcium carbonate (CaSO4), magnesium carbonate (MgCO3) (OH) 3), synthetic silica, glass beads, and diamond. In addition, the particle size of the diffusing agent may be selected to be a size suitable for light diffusion, and may have a diameter of, for example, 5 to 7 μm.

One surface of the base 151 has a predetermined roughness. Here, one surface is preferably a surface in contact with the coating layer 153. The reason why the one surface of the base 151 has a predetermined roughness is that the fine irregularities are uniformly distributed as shown in FIG. 8, or that the fine irregularities are nonuniformly distributed as shown in FIG. 9 do.

The coating layer 153 is coated on the surface of one side of the base 151. The coating layer 153 may be formed of at least one of a resin material and a silicon material, and preferably a silicone resin (Silicone Resin). Here, the coating layer 153 may be formed on or under the base 151, or a coating layer including different phosphors may be formed on the base 151 at the same time

The coating layer 153 has at least one phosphor 153-1. The phosphor 153-1 excites the light. The phosphor 153-1 may be incorporated in the coating layer 153 by being mixed with a liquid coating layer 153 and stirred using a stirrer.

The phosphor 153-1 excites the light from the light source module 130 to emit the excited light. The phosphor 153-1 may be at least one of a silicate series, a sulfide series, a YAG series, a TAG series, and a nitride series, for example.

The phosphor 153-1 may include at least one of yellow, red, green, and blue phosphors emitting yellow, red, green, and blue light. However, It is not limited.

On the other hand, CaS: Eu can be used as a typical sulfide-based inorganic phosphor for emitting a core color. As the orange phosphor, at least one of SrS: Eu and MgS: Eu of the sulfide series may be used. As the green phosphor, SrGa2S4 and Eu2 + of the sulfide series can be used.

Different types and amounts of the phosphors 153-1 may be included in the coating layer 153 depending on the light source. For example, when the light source is a white light source, the coating layer 153 may include green and red phosphors. Further, when the light source is a blue light source, the coating layer 153 may include green, yellow and red phosphors. As described above, the type and amount of the phosphor 153-1 included in the coating layer 153 may vary according to the type of the light source, but the present invention is not limited thereto.

The coating layer 153 may further include at least one or more of a diffusing agent, an antifoaming agent, an additive, and a curing agent.

The diffusing agent can diffuse the light incident on the coating layer 153 by scattering. Examples of the diffusion agent include silicon oxide (SiO2), titanium oxide (TiO2), zinc oxide (ZnO), barium sulfate (BaSO4), calcium carbonate (CaSO4), magnesium carbonate (MgCO3) 3), synthetic silica, glass beads, and diamond. However, the present invention is not limited thereto.

The defoaming agent can ensure reliability by removing bubbles in the coating layer 153. Particularly, it is possible to solve the bubble problem which is a problem when the coating layer 153 is coated on the base 151 by the screen printing method. Examples of the antifoaming agent include, but are not limited to, at least one of octanol, cyclohexanol, ethylene glycol, and various surfactants.

The curing agent may cure the coating layer 153.

The additive may be used to evenly disperse the phosphor 153-1 in the coating layer 153. [

The coating layer 153 may be composed of a layer having a red phosphor, a layer having a green phosphor, and a layer having a yellow phosphor instead of a mixture of various phosphors. For example, the coating layer 153 may be formed of at least one of a first coating layer having a red phosphor, a second coating layer having a green phosphor, and a third coating layer having a yellow phosphor.

The light excitation plate 150 including the base 151 and the coating layer 153 can change the wavelength of the light emitted from the light emitting device 135 of the light source module 130 and emit the light to the outside. Therefore, the light excitation plate 150 can be used to generate light having various wavelengths, or can be used for various light sources such as various lighting devices, backlight units, light emitting devices, and display devices, And the like.

Since the one surface of the base 151 of the photo-excitation plate 150 has a predetermined roughness, when the coating layer 153 is coated on one surface of the base 151, the uniformity of the coating can be secured. More specifically, FIG. 10 and FIG. 11 will be referred to.

10 is a view showing the appearance of the coating layer when roughness is not provided and the appearance of the coating layer 153 having roughness. The left side is the appearance of the coating layer when there is no predetermined roughness, and the right side is the appearance of the coating layer 153 when there is the predetermined roughness. 11 is an actual photograph of Fig.

Referring to FIGS. 10 and 11, it can be seen that no coating line is formed on the coating layer 153 when a predetermined roughness is present on the base 151.

Further, the photo-excitation plate 150 is excellent in adhesion. This will be described with reference to FIG.

FIG. 12 is a comparative photograph to confirm the adhesive performance of the photo excitation plate 150 shown in FIG. The left photograph is a photograph showing a state after a predetermined time after attaching 25 square pieces of 1 mm ² square material to a light excitation plate having no predetermined roughness using a tape, This is a photograph showing the state after a predetermined time after attaching 25 substances with a tape.

Comparing the two photographs of FIG. 12, it can be seen that the adhesion of the photo-excitation plate 150 is better.

Since the base 151 of the photo-exciting plate 150 has a predetermined roughness, the phosphor 153-1 included in the coating layer 153 has the same thickness and the coating layer on the rough base Is higher than the phosphor content contained in the coated light excitation plate.

On the other hand, in the case where the base 151 of the photo-excitation plate 150 is a diffuser substrate to which a diffusing function is further added, it is possible to compensate for a reduction in luminous flux (approximately 30%) due to the transmissivity of the diffuser substrate (approximately 60% . Specifically, it is explained with reference to <Table 1> and <Table 2> below. Experiments in <Table 1> and <Table 2> were conducted with the same light emitting diodes.

Board Number of applications Lm CIE CCT Power Eff. PC


One 353.8 0.2040 0.1114 - 8.64 39.6 2 514.4 0.2401 0.1758 - 8.64 63 3 628.8 0.3001 0.2759 8469 8.68 69.5 4 603 0.3337 0.3324 5438 8.67 72.5

Table 1 shows a coating layer 153 coated on a general polycarbonate (PC) base having no predetermined roughness. The coating layer 153 is coated once to four times, and the luminous flux Lm, It shows coordinate system (CIE), color temperature (CCT), power, efficiency (Eff.).

Board Number of applications Lm CIE CCT Power Eff. Diffuser
Substrate

One 455.3 0.2231 0.1822 - 8.51 53.5 2 635.9 0.3040 0.3248 7043 8.65 73.5 3 646.6 0.3617 0.4240 4741 8.75 73.9 4 603.8 0.3980 0.4809 4190 8.73 69.2

Table 2 shows the luminous flux Lm, the chromaticity coordinate system (CIE), the chromaticity coordinate system (CIE), the chromaticity coordinate system (CIE), and the chromaticity coordinates (CIE) when the coating layer 153 is coated one to four times when the base 151 is a diffuser substrate, It shows color temperature (CCT), power (power) and efficiency (Eff.).

As shown in Table 1 and Table 2, for example, when one coating layer 153 is coated on each substrate, the luminous flux at the time of PC (0.5T) is 353.8 (Lm) (Diffuser Substrate) was 455.3 (Lm). It was confirmed through this experiment that the transmittance of the diffuser substrate is lower than that of a general PC, so that the light flux is lowered as compared with a general PC. However, since the diffuser substrate has a predetermined roughness, I could confirm. This is because the surface area of the phosphor 153-1 included in the coating layer 153 is increased due to the roughness.

The illumination device according to another embodiment of the present invention shown in Fig. 6 has an advantage that the color temperature and the color rendering index can be further improved by further using the light excitation plate 150 in the illumination device shown in Fig.

In the method of manufacturing the photo-exciting plate 150, first, a light-transmitting base 151 having a predetermined roughness is provided. Here, the light-transmitting base 151 may be a diffuser base 151 to which a light diffusion function is further added.

Next, the phosphor 153-1 is mixed with the coating solution. The mixing of the coating liquid and the phosphor 153-1 is preferably performed through an ultrasonic dispersing machine.

Next, the coating solution containing the phosphor 153-1 is coated on one surface having a predetermined roughness in the light-transmitting base 151 as well.

The light excitation plate 150 can be manufactured through the above process.

In addition, the photo-excitation plate 130 may use a polymer plate including a phosphor. A light excitation plate 130 including the above-mentioned phosphor and a diffusing agent may be fabricated in a polymer plate or a plastic, a fluorescent material and an additive may be mixed and injected using an injection molding method The light excitation plate 130 may be manufactured.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is to be understood that the invention is not limited to the disclosed exemplary embodiments, but, on the contrary, It will be understood that various modifications 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.

110: Housing
130: Light source module
131: substrate
133: photo excitation layer
135: Light emitting element
150: light excitation plate
151: Base
153: Coating layer
170: wire

Claims (13)

housing;
A light source module housed in the housing; And
And a light excitation plate disposed on the light source module,
The light source module includes:
Board;
A plurality of light emitting devices provided on the substrate; And
And a photoexcitation layer provided on the substrate and disposed adjacent to the light emitting element, the photoexcitation layer including a red phosphor,
Wherein the light excitation plate comprises at least one phosphor,
Wherein the photoexcitation layer is disposed between the plurality of light emitting elements, and the height of the photoexcitation layer is lower than the height of the light emitting element.
The method according to claim 1,
Wherein the photoexcitation layer is coated on the substrate.
The method according to claim 1,
Wherein the photoexcitation layer further comprises a yellow or green phosphor.
The method according to claim 1,
Wherein the housing emits heat from the light source module.
housing;
A light source module housed in the housing; And
And a light excitation plate disposed on the light source module,
The light source module includes:
Board;
A light emitting element provided on the substrate; And
And a photoexcitation layer provided on the substrate and disposed adjacent to the light emitting element, the photoexcitation layer including a red phosphor,
The photo-
A base disposed on the housing on the light source module, the base having a rough surface and transmitting light; And
And a coating layer coated on one surface of the base and having at least one phosphor.
6. The method of claim 5,
And the base has a diffuser function for diffusing the light.
6. The method of claim 5,
Wherein the coating layer comprises at least one of a diffusing agent, a defoaming agent, an additive, and a curing agent.
6. The method of claim 5,
Wherein the coating layer comprises at least one of yellow, red, green and blue phosphors.
6. The method of claim 5,
Wherein fine irregularities are uniformly or nonuniformly formed on one surface of the base.
6. The method of claim 5,
Wherein the coating layer comprises at least one of a first coating film having a yellow phosphor, a second coating film having a red phosphor, and a third coating film having a blue phosphor.
6. The method of claim 5,
Wherein the base comprises a diffusing agent.
6. The method of claim 5,
Wherein the base is made of a resin material.
13. The method according to any one of claims 1 to 12,
Wherein at least one of the substrate and the inner wall surface of the housing includes a reflective layer and the photoexcitation layer is positioned on the reflective layer.

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