KR101791505B1 - Phosphor coating matrix - Google Patents

Abstract

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photo-excitation plate, and more particularly, to a photo-excitation plate used for LED (Light Emitting Diode) illumination.
According to an embodiment of the present invention, there is provided a photo-excitation plate comprising: a substrate having a rough surface and transmitting light; And a coating layer coated on the surface of one surface of the substrate and having at least one phosphor that emits excitation light excited by the light, wherein the phosphor has a yellow phosphor, a red phosphor, a green phosphor, A phosphor, and a blue phosphor.

Description

{PHOSPHOR COATING MATRIX}

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a photo-excitation plate, and more particularly, to a photo-excitation plate used for LED (Light Emitting Diode) illumination.

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,

The present invention provides a photo excitation plate of a new structure.

Further, there is provided a light excitation plate capable of enhancing the photoexcitation efficiency.

Further, there is provided a photo-excitation plate having high coating uniformity.

Further, there is provided a photo-excitation plate having good adhesion.

Also provided is a light excitation plate having a high phosphor content.

Further, there is provided a light excitation plate capable of compensating for a decrease in luminous flux.

According to an embodiment of the present invention, there is provided a photo-excitation plate comprising: a substrate having a rough surface and transmitting light; And a coating layer coated on the surface of one surface of the substrate and having at least one phosphor that emits excitation light excited by the light, wherein the phosphor has a yellow phosphor, a red phosphor, a green phosphor, A phosphor, and a blue phosphor.

Here, it is preferable that the light and the excitation light overlap and are emitted to the outside.

Here, the coating layer preferably includes at least one of a diffusing agent, a defoaming agent, an additive, and a curing agent.

Here, it is preferable that when the light is white light, the coating layer includes the green phosphor and the red phosphor, and when the light is blue light, the coating layer includes the green phosphor, the yellow phosphor and the red phosphor.

Here, fine irregularities may be uniformly or nonuniformly formed on one surface of the substrate.

Here, the substrate preferably includes a diffusing agent.

Here, the substrate is preferably made of a resin material.

The use of the photo excitation plate according to the embodiment of the present invention has an advantage that the light excitation efficiency can be increased.

Further, there is an advantage that the coating uniformity is high.

In addition, there is an advantage of good adhesion.

Further, there is an advantage that the content of the phosphor is high.

In addition, there is an advantage that light flux can be compensated for.

1 is a perspective view of a light excitation plate according to an embodiment of the present invention,
Figs. 2A and 2B are cross-sectional views of the light excitation plate shown in Fig. 1,
3 is a view showing a state of a coating layer when the substrate has no predetermined roughness and a state of a coating layer having a predetermined roughness,
Figure 4 is an actual photograph of Figure 3,
FIG. 5 is a comparative photograph to confirm the adhesive performance of the photo excitation plate shown in FIG. 1;

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 of being described as being formed "on or under" of each element, the upper (upper) or lower (lower) or under are all such that 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 light excitation plate according to an embodiment of the present invention will be described with reference to the accompanying drawings.

FIG. 1 is a perspective view of a light excitation plate according to an embodiment of the present invention, and FIG. 2 is a sectional view of the light excitation plate shown in FIG.

Referring to FIGS. 1 and 2, a photo-excitation plate 100 according to an embodiment of the present invention includes a substrate 110 and a coating layer 130.

The substrate 110 is preferably made of a resin material that transmits light. 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. Particularly, when heat resistance and chemical resistance of the substrate 110 are required, the substrate 110 is preferably polycarbonate (PC).

The substrate 110 can diffuse light as well as transmit light. For example, the substrate 110 may be a diffusive plate or a light-transmissive 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.

The substrate 110 has a predetermined roughness on one surface, as shown in Figs. 2A and 2B. Here, one surface is preferably a surface in contact with the coating layer 130. The fact that one surface of the substrate 110 has a predetermined roughness means that the fine irregularities are uniformly distributed as shown in FIG. 2A or that the fine irregularities are non-uniformly distributed as shown in FIG. 2B do.

The coating layer 130 is coated on one surface of the substrate 110. The coating layer 130 may be formed of at least one of a resin material and a silicon material, and preferably a silicone resin (Silicone Resin).

The coating layer 130 has at least one phosphor 135. The phosphor 135 excites light. The fluorescent material 135 may be contained in the coating layer 130 by mixing with a liquid coating layer 130 and stirring using a stirrer.

The phosphor 135 excites the light from the light source and emits the excited light. The phosphor 135 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 135 may include at least one of yellow, red, green, and blue phosphors emitting yellow, red, green, and blue light. However, the type of the phosphor 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 135 may be included in the coating layer 130 depending on the light source. For example, when the light source is a white light source, the coating layer 130 may include green and red phosphors. Further, when the light source is a blue light source, the coating layer 130 may include green, yellow, and red phosphors. As described above, the type and amount of the fluorescent material 135 included in the coating layer 130 may vary according to the type of the light source, but the present invention is not limited thereto.

The coating layer 130 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 coating layer 130 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 130. Particularly, it is possible to solve the bubble problem which is a problem when the coating layer 130 is coated on the substrate 110 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 130.

The additive may be used to evenly disperse the phosphors 135 in the coating layer 130.

Meanwhile, the coating layer 130 may be composed of a layer having a red-based phosphor, a layer having a green-based phosphor, and a layer having a yellow-based phosphor separately, in addition to mixing various kinds of phosphors.

As described above, the photo-excitation plate 100 including the substrate 110 and the coating layer 130 has an effect of changing the wavelength of light emitted from the light source and emitting the light to the outside. Accordingly, the photo-excitation plate 100 may be used for generating light having various wavelengths, or may be used for various light sources such as various illumination devices, backlight units, light emitting devices, and display devices, And the like.

1 has a predetermined roughness on one surface of the substrate 110. Therefore, when the coating layer 130 is coated on one surface of the substrate 110, the uniformity of the coating is secured can do. 3 and FIG. 4 will be referred to concretely.

3 is a view showing a state of a coating layer when the substrate has no predetermined roughness and a state of a coating layer having a predetermined roughness. The left figure is the appearance of the coating layer when there is no predetermined roughness, and the right figure is the appearance of the coating layer when there is the predetermined roughness. 4 is an actual photograph of Fig.

Referring to FIGS. 3 and 4, it can be seen that there is no coating line in the coating layer when there is a predetermined roughness on one side of the substrate.

Further, the photo-excitation plate 100 according to the embodiment of the present invention is excellent in adhesion. This will be described with reference to FIG.

FIG. 5 is a comparative photograph showing the adhesion performance of the photo excitation plate shown in FIG. 1. FIG. The photograph on the left is a photograph showing a state after a predetermined time has elapsed after 25 square pieces of 1 mm 2 are attached 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 pieces of the square material using a tape.

Comparing the two photographs of FIG. 5, it was confirmed that the adhesion of the photoexcitation plate shown in FIG. 1 was better.

Since the substrate 110 has a predetermined roughness, the phosphor 135 included in the coating layer 130 may have the same thickness and the roughness may be reduced. Which is higher than the phosphor content in the light excitation plate coated with a coating layer on a general substrate.

Meanwhile, in the case where the substrate 110 of the photo-excitation plate 100 according to the embodiment of the present invention is a diffuser substrate to which the diffusing function is further added, the luminous flux reduction (approximately 30%) due to the transmissivity of the diffuser substrate %) Can be compensated. Specifically, it is explained with reference to <Table 1> and <Table 2> below. The experiments in <Table 1> and <Table 2> were performed with the same light source.

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 8496 8.68 69.5 4 603 0.3337 0.3324 5438 8.67 72.5

1 is a coating of a coating layer 130 shown in FIG. 1 on a general polycarbonate (PC) substrate having no predetermined roughness, and the light flux Lm when the coating layer is coated once to four times, , Color 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 fluxes Lm and Lm when the coating layer 130 is coated once to four times when the substrate 110 is a diffuser substrate in the photo excitation plate 100 shown in FIG. It shows coordinate system (CIE), color temperature (CCT), power, efficiency (Eff.).

As shown in Table 1 and Table 2, for example, when one coating layer 130 is coated on each of the substrates, the luminous fluxes are 353.8 (Lm) for PC (0.5T) (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 135 included in the coating layer 130 is increased due to the roughness.

In the method of manufacturing the photo excitation plate 100 according to the embodiment of the present invention shown in FIGS. 1, 2A and 2B, first, a transparent substrate 110 having a predetermined roughness is provided. Here, the transparent substrate 110 may be a diffuser substrate 110 that further adds a light diffusion function.

Next, the phosphor 135 is mixed with the coating solution. The mixing of the coating liquid and the phosphor 135 is preferably performed through an ultrasonic disperser.

Next, the coating solution containing the phosphor 135 is coated on one side of the translucent substrate 110 having a predetermined roughness.

Through the above process, the photo-excitation plate 100 according to an embodiment of the present invention can be manufactured.

The features, structures, effects and the like described in the embodiments are included in at least one embodiment of the present invention and are not necessarily limited to only one embodiment. Furthermore, the features, structures, effects and the like illustrated in the embodiments can be combined and modified by other persons skilled in the art to which the embodiments belong. Therefore, it should be understood that the present invention is not limited to these combinations and modifications.

100: light excitation plate
110: substrate
130: Coating layer
135: Phosphor

Claims (7)

A substrate including a diffusing agent, one surface of which has a roughness and transmits light; And
A coating layer coated on a surface of one surface of the substrate and having at least one phosphor emitting excitation light excited by the light;
/ RTI &gt;
Wherein the phosphor includes at least one of a yellow phosphor, a red phosphor, and a green phosphor according to a hue of the light,
Wherein when the light is white light, the coating layer includes the green phosphor and the red phosphor,
Wherein the coating layer comprises the green phosphor, the yellow phosphor and the red phosphor when the light is blue light.
The method according to claim 1,
Wherein the light and the excitation light overlap each other and are emitted to the outside.
The method according to claim 1,
Wherein the coating layer comprises at least one of a diffusing agent, a defoaming agent, an additive, and a curing agent.
delete The method according to claim 1,
Wherein a fine unevenness is uniformly or nonuniformly formed on one surface of the substrate.
delete delete

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