KR20150087604A - Ceramic phosphor plate and light lamp apparatus including the same - Google Patents

Abstract

The embodiment of the present invention relates to a ceramic phosphor plate which includes a first phosphor layer which includes a short wavelength range in a transparent ceramic matrix; and a second phosphor layer including a long wavelength range. Also, another embodiment of the present invention relates to a light lamp which includes a phosphor layer which includes a short wavelength range phosphor having a wavelength of 510nm to 580nm in a transparent ceramic matrix; and a second phosphor layer which is made of a long wavelength range phosphor having a wavelength of 580nm to 680nm.

Description

TECHNICAL FIELD [0001] The present invention relates to a ceramic phosphor plate and a lighting apparatus including the ceramic phosphor plate.

An embodiment of the present invention relates to a lighting device and a phosphor plate constituting the lighting device.

Because low-power / high-efficiency light sources use phosphors as low-wavelength light sources that emit with a relatively narrow spectral width, they must be converted to white light for practical use. In such a conversion process, the phosphors degrade and deteriorate Reliability problems may arise. In order to solve such a problem, there is a need to research a phosphor capable of disposing a light source and a phosphor separately from each other.

A separate base substrate for coating such a phosphor is required, and this substrate has been a factor for increasing the cost of the raw material of the lighting member as a support layer of a simple phosphor film. In addition, some transmittance and optical loss are generated optically as an intermediate layer. As shown in FIG. 1, two or more kinds of phosphors 11 and 12 are mixed and used in order to adjust a specific color temperature when the phosphor plate 10 is manufactured. As can be seen from the graph of FIG. 2, And the emission wavelengths overlap with each other and the characteristics of each other are degraded.

In addition, when applied to an illumination as a remote phosphor, the fluorescent material exposed to the outside of the illumination is likely to be contaminated by external moisture and dust, and the fluorescent film due to scratches may be partially broken, It is the main cause. Conventional phosphors can be applied to low-power light sources in the form of UV curing, but in high-power lighting, the phosphor layer is prone to thermal damage and is therefore limited in its scope of application.

An embodiment of the present invention provides a light emitting device comprising: a first phosphor layer including a short wavelength region phosphor in a translucent ceramic matrix; And a second phosphor layer containing a long wavelength region fluorescent material.

According to an aspect of the present invention, there is provided a light emitting device comprising: a first phosphor layer including a short wavelength region phosphor in a translucent ceramic matrix; And a second phosphor layer including a long wavelength region fluorescent material.

According to another aspect of the present invention, there is provided a light emitting device comprising: a first phosphor layer including a short wavelength region phosphor having a wavelength of 510 nm to 580 nm in a translucent ceramic matrix; A second phosphor layer made of a long wavelength region phosphor having a wavelength of 580 nm to 680 nm; And a light incidence portion.

According to this embodiment, a first phosphor layer including a short wavelength region fluorescent substance in a translucent ceramic matrix; And the second phosphor layer including the long wavelength region fluorescent material, the use amount of the expensive long wavelength region fluorescent material (red fluorescent material) can be reduced and the manufacturing cost can be reduced.

Also, according to this embodiment, it is easy to adjust the color temperature according to the required characteristics, and the physical characteristics such as the color rendering index (CRI) and the light efficiency are improved.

1 is a cross-sectional view showing a conventional phosphor plate.
2 is a graph showing a wavelength range of each color of light.
3 is a plan view and a cross-sectional view of the ceramic phosphor plate according to this embodiment.
4 is a plan view and a cross-sectional view of a patterned ceramic phosphor plate according to this embodiment.
FIG. 5 is a schematic view illustrating a light that is excited while light emitted from a light source according to the present embodiment passes through a ceramic phosphor plate.
6 is a cross-sectional view showing a schematic structure of a lighting apparatus according to the present embodiment.
7 is a graph plotting the transmittance with respect to the firing temperature and thickness of the ceramic phosphor plate according to the present embodiment, and FIG. 7B is a graph showing the correlation of the transmittance with respect to the thickness and the firing temperature of the ceramic phosphor plate according to the present embodiment It is a one-sided graph.
FIG. 8 is a graph plotting optical efficiency versus firing temperature and thickness of the ceramic phosphor plate according to the present embodiment, and FIG. 8 (b) is a graph showing the relationship between the thickness and the firing temperature of the ceramic phosphor plate according to this embodiment As shown in FIG.
9 is a graph illustrating the correlation between the area ratio of the pattern of the ceramic phosphor plate according to the present embodiment and the red phosphor content and the color temperature (CCT).

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. It should be understood, however, that the embodiments described in the present specification and the constitutions shown in the drawings are only a preferred embodiment of the present invention, and that various equivalents and modifications can be made at the time of filing of the present application . DETAILED DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description, well-known functions or constructions are not described in detail to avoid obscuring the subject matter of the present invention. The following terms are defined in consideration of the functions of the present invention, and the meaning of each term should be interpreted based on the contents throughout this specification. The same reference numerals are used for portions having similar functions and functions throughout the drawings.

3 is a plan view and a cross-sectional view of the ceramic phosphor plate 100 according to the present embodiment.

Referring to FIG. 3, the ceramic phosphor plate 100 according to the present embodiment includes a first phosphor layer 110 and a second phosphor layer 120. The first phosphor layer 110 includes a phosphor in a short wavelength region in a translucent ceramic matrix. The phosphor in the short wavelength region may be an inorganic phosphor in a green to yellow region having a wavelength of 510 nm to 580 nm. The fluorescent material of the short wavelength region may be a mixture of two or more fluorescent materials within the wavelength range. The first phosphor layer 110 is formed in the form of a plate through compression and firing so as to replace the substrate in the conventional phosphor plate.

The inorganic phosphor is mixed as a powder form, and the inorganic phosphor is mixed with a ceramic powder as a translucent ceramic matrix, and is sufficiently mixed and dispersed using a ball mill. As the kind of the ceramic powder, a material having a light transmittance of 40% or more can be used when the thickness is 100 탆. For example, transparent silicate ceramics suitable for optical materials such as borate glass or phosphate glass, and aluminum oxide ceramics can be used. The short wavelength region fluorescent material is contained in the light transmitting ceramic matrix in an amount of 1 to 10% by weight.

The mixture of inorganic phosphor and glass powder is put into a stainless steel mold (SUS) so as to have a plate or a disc shape, and uniaxial compression is performed. At this time, compression is performed for 7 minutes to 5 minutes. The compressed inorganic phosphor-glass powder mixture is fired in a firing furnace. At this time, in accordance with the inorganic phosphor and a glass transition temperature (T _g) of the glass powder it can be adjusted to a temperature and for a time to perform a firing.

The baked phosphor plate (first phosphor layer 110) performs surface polishing to adjust the thickness and adjust the surface roughness to meet the characteristics required in the present embodiment. At this time, the first phosphor layer 110 is polished to have a thickness of 200 to 1000 占 퐉 and a surface roughness (surface roughness) of 0.1 to 0.3 占 퐉.

The second phosphor layer 120 is formed by applying a paste containing a long wavelength region fluorescent material on one surface of a first phosphor layer 110 prepared in the form of a plate. The long wavelength region fluorescent material may be an inorganic fluorescent material having a wavelength of 580 nm to 680 nm in a red region. The fluorescent material in the long wavelength region may be a mixture of two or more fluorescent materials within the wavelength range.

The phosphor of the long wavelength region is mixed with a translucent ceramic powder and an organic vehicle of ethyl cellulose type to prepare a phosphor paste. The translucent ceramic powder may be glass powder, and the glass powder may be, for example, transparent glass suitable as an optical material such as borate glass or phosphate glass. The phosphor of the long wavelength region may have a particle diameter of 1 占 퐉 to 20 占 퐉, and the glass powder may have a particle diameter of 1 占 퐉 to 20 占 퐉. If the particle diameter of the powdery glass is too small, there is a fear that aggregation may occur during mixing of the organic vehicle. On the contrary, when the particle size is too large, light transmitted through the fluorescent substance becomes more light, Can not be obtained. The powdery glass may be a mixture of a powder having a relatively large particle size and a powder having a relatively small particle size. The translucent ceramic powder may be used in an amount of 35 wt% to 50 wt%, and the organic vehicle may be added in an amount of 35 wt% to 50 wt%. The mixing ratio with the phosphor may be adjusted according to the required optical characteristics.

If the particle diameter of the long wavelength fluorescent material is less than 1 탆, aggregation may occur during mixing with the organic vehicle. On the other hand, when the particle size of the phosphor is more than 20 탆, a sufficient viscosity can not be obtained and it is difficult to obtain a pattern of a form required for printing a phosphor paste on a transparent substrate. Further, since the space between the phosphor particles increases, there is a possibility that the light transmitted through the phosphor is larger than the light excited by the phosphor. The long wavelength fluorescent material may include 15 wt% to 30 wt%. The content of the phosphor may be 25% to 55% of the content of the light transmitting ceramic powder. When the content is less than 25%, the amount of the red phosphor is too small, so that the red light is difficult to emit, and the amount of the transparent ceramic powder increases, and the transmittance of the entire paste may decrease. On the other hand, if it is more than 55%, the amount of the phosphor is too large to sufficiently encapsulate the translucent ceramics, which may result in physical scratches or low reliability in a high temperature and high humidity environment. The content of the phosphor may be controlled depending on the kind of the phosphor.

The content of the solid content of the phosphor and the translucent ceramic powder in the phosphor paste may be in a ratio of 1.5: 1 to 1: 1, as compared with the content of the organic vehicle. When the ratio of the solid content is less than 1, the viscosity of the phosphor paste is too low, and the shape of the pattern is distorted during printing, so that the accurate shape can not be maintained. On the other hand, when the ratio of the solid content is more than 1.5, the viscosity of the phosphor paste tends to be high, and the printability may remarkably decrease.

The long wavelength region fluorescent material, the translucent ceramic powder, and the organic vehicle are put into a paste mixer and mixed by pre-emitter mixing at 100 rpm to 1000 rpm for 1 minute to 30 minutes. Thereafter, the mixture is put into a 3-roll mill and remarried at 100 rpm to 1000 rpm for 1 minute to 30 minutes. The re-mixed mixture is applied to the first phosphor layer 110 by a method such as bar coating or screen coating to form a second phosphor layer. Thereafter, the ceramic phosphor plate of the present embodiment in which the second phosphor layer 120 is formed on the first phosphor layer 110 is completed by drying or heat treatment. The heat treatment is for sintering the phosphor paste and removing the organic vehicle, and the heat treatment can be performed in a heat treatment furnace or an oven without significantly limiting the heat treatment method.

4 is a plan view and a cross-sectional view of the patterned ceramic phosphor plate 200 according to the present embodiment.

Referring to FIG. 4, the ceramic phosphor plate 200 according to the present embodiment includes a second phosphor layer 220 patterned on the first phosphor layer 210. The first phosphor layer 210 is produced in the form of a plate through compression and firing so as to replace the substrate in the conventional phosphor plate. The method of forming the first phosphor layer 210 is the same as that described with reference to FIG. 3, so that the description thereof will be omitted in order to avoid duplication. The phosphor paste including the long wavelength region fluorescent material constituting the second phosphor layer 220 is also the same as that described in FIG. 3, so that the description thereof will be omitted in order to avoid redundancy.

3, the phosphor paste is printed so as to form a pattern 222, unlike the case where it is coated on the entire surface of the first phosphor layer (110 in FIG. 3). 4, circular patterns 222 are shown. However, it is not limited thereto, and various types of patterns can be printed according to characteristics of a required phosphor plate such as a rectangle, a square, a hexagon, and a triangle. The size of the pattern 222 can be adjusted according to a color coordinate and a CRI (color rendering index) to be implemented. The size of the pattern 222 may be 500 탆 ² to ¹⁰⁶ 탆 ² regardless of the shape. The total area of the pattern 222 may be 20% to 100% of the area of the first phosphor layer 210 to adjust the number and spacing to form the pattern 222. As the area ratio of the first phosphor layer 210 and the second phosphor layer 220 increases, that is, as the area of the pattern 220 becomes larger or the number of the patterns increases, warm white can be realized. The characteristics such as the color temperature of the light will be described later in detail.

As a method of forming the pattern 222, a method of performing patterning simultaneously with application of a screen printing, a gravure coating, or the like can be used. In the screen printing, it is easy to adjust the number of the patterns by controlling the number of meshes of the screen, but it is relatively difficult to control the separation distance of the pattern form. On the other hand, when gravure coating is used, it is easy to pattern and form a desired pattern on a copper plate or the like, but it requires additional cost such as copper plate production. Therefore, an appropriate printing method can be used in accordance with the characteristics of the required illumination.

5 is a schematic diagram showing a schematic view of light that is excited while light irradiated from the light source 1100 according to the present embodiment passes through the ceramic fluorescent plate 1200. FIG.

Referring to FIG. 5, the illumination device according to another aspect of the present embodiment includes a ceramic phosphor plate 1200 having a short wavelength region fluorescent material layer 1210 and a long wavelength region fluorescent material layer 1220. The short wavelength region fluorescent substance layer 1210 includes an inorganic fluorescent substance having a wavelength in the range of 510 nm to 580 nm and the long wavelength region fluorescent substance layer 1220 includes an inorganic fluorescent substance having a wavelength in the wavelength range of 580 nm to 680 nm. The light incidence portion 1100 is disposed close to the long wavelength region fluorescent layer 1220 side.

The translucent ceramic matrix constituting the short wavelength region fluorescent material layer 1210 may have the same or different refractive index as the matrix of the long wavelength region fluorescent material layer 1220, It is preferable to use a material having a high refractive index. Since the materials and the constructions of the short wavelength region fluorescent substance layer 1210 and the long wavelength region fluorescent substance layer 1220 have been described above, a description thereof will be omitted in order to avoid redundancy.

The light incident portion 1100 preferably emits light in the blue wavelength region. When the incident light L _I from the light incidence portion 1100 is irradiated to the ceramic fluorescent plate 1200, the incident light L _I is incident on the excitation light L _E1 and L _E2 along the region of the ceramic fluorescent plate 1200, The wavelength of the light is different. That is, when the incident light L _I is irradiated to a portion where the short wavelength region fluorescent substance layer 1210 is exposed, the light is excited from the short wavelength region fluorescent substance. However, when the incident light L _I passes through the translucent ceramic matrix of the short wavelength region fluorescent material layer 1210, the excitation light L _E1 is transmitted through the blue wavelength region as it is. On the other hand, when the incident light L _I is irradiated onto the patterned region of the long wavelength region phosphor layer 1220, the excitation light L _E2 is excited into the light in the red wavelength region.

Accordingly, the color temperature of the excited light changes depending on the ratio of the total area of the pattern 1222 of the long wavelength region fluorescent material layer 1220 to the area of the short wavelength region fluorescent material layer 1210. That is, when the ratio of the total area of the pattern 1222 of the long wavelength region fluorescent material layer 1220 to the area of the short wavelength region fluorescent material layer 1220 is 20% to 35%, the blue wavelength region and the light of the yellow or green wavelength region The color temperature becomes cool white white light of 4000K to 6000K. On the other hand, when the ratio of the total area of the pattern 1222 of the long wavelength region fluorescent substance layer 1220 to the area of the short wavelength region fluorescent substance layer 1210 exceeds 35%, the ratio of light in the red wavelength region becomes high, White light of a warm white color can be realized.

6 is a cross-sectional view showing a schematic structure of a lighting apparatus 2000 according to the present embodiment.

Referring to Fig. 6, the illuminating device according to the present embodiment includes the ceramic phosphor plate 2200 described above. The ceramic phosphor plate 2200 is spaced apart from the light source 2100. The distance from the light source may be 10 mm to 20 mm. The spacing distance may preferably be 12 mm to 18 mm. If the spacing distance exceeds 20 mm, there is a possibility that light extraction may not be sufficiently performed. On the other hand, if the spacing distance is less than 10 mm, the ceramic fluorescent substance 2200 may be thermally deformed due to heat generated from the light source 2100.

The illumination device includes a housing 2300 having a shape that widens from the bottom surface toward the upper side with the light source 2100 as a center. As the light source 2100, for example, a solid light emitting element can be applied as an optical element for emitting light. The solid state light emitting device may be any one selected from an LED, an OLED, a laser diode (LD), a laser, and a VCSEL. A ceramic phosphor plate 2200 is provided on the upper end of the housing 2300 and is disposed to be spaced apart from the light source 2100. The ceramic phosphor plate 2200 includes a matrix composed of glass frit and a ceramic phosphor dispersed in the matrix as described above. The inside of the housing can be filled with a material having a refractive index higher than or equal to the refractive index of the ceramic phosphor plate 2200.

In addition, the optical characteristic can be measured as such an integrating sphere (integrating sphere). The integrating sphere has a constant internal brightness at any angle and captures all of the light reflected from the sample surface and distributes the light uniformly on the surface of the integrating sphere. There are special paint and polytetrafluoroethylene (PTFE) coating materials on the inner wall of the integrating sphere and care should be taken not to contaminate the interior. In the case of spectral transmittance, 100% of the light transmitted without the sample is taken as 0% when the light is completely blocked by the opaque object such as the iron plate. When the dispersion effect in the permeation color is large in the permeation color, it is preferable to measure using an integral sphere.

The integrating sphere is prepared such that W _T is 55 mm to 60 mm, W _B is 35 mm to 40 mm, and H is 15 mm to 20 mm. First, the radiant flux of the blue LED, which is the light source 2100, is measured in the absence of the ceramic phosphor plate 2200. Then, the luminous efficiency can be obtained by measuring the luminous flux by mounting the ceramic phosphor plate 2200 and then dividing by the luminous flux value of the blue LED measured previously.

7 is a graph plotting the transmittance with respect to the firing temperature and thickness of the ceramic phosphor plate according to the present embodiment, and FIG. 7B is a graph showing the correlation of the transmittance with respect to the thickness and the firing temperature of the ceramic phosphor plate according to the present embodiment It is a one-sided graph.

FIG. 8 is a graph plotting optical efficiency versus firing temperature and thickness of the ceramic phosphor plate according to the present embodiment, and FIG. 8 (b) is a graph showing the relationship between the thickness and the firing temperature of the ceramic phosphor plate according to this embodiment As shown in FIG.

Referring to FIGS. 7 and 8, it can be seen that the transmittance decreases with the thickness of the ceramic phosphor plate and the firing temperature, but the light efficiency increases. Therefore, it is necessary to control the thickness and the firing temperature in order to keep the transmittance at a high level but not to decrease the light efficiency. However, since there is a limitation in physically controlling the thickness, it is possible to pattern the long wavelength region phosphor layer to adjust the size and number of patterns so that the transmittance does not decrease while maintaining a high light efficiency thickness.

Hereinafter, the present invention will be described more specifically by way of examples. However, the following examples are intended to aid understanding of the present invention, and the scope of the present invention is not limited to these examples in any sense.

[ Example ]

Example  1 to Example  3

A PhiG matrix (Phosphor in Glass matrix) was prepared in the form of a circular plate having a thickness of 0.5 mm and a diameter of 60 mm so as to contain 7 wt% of a LuAG phosphor (green) having an emission wavelength of 550 nm. A red phosphor paste was prepared by mixing 20 wt% of 620 nm nitride phosphor (red), 40 wt% of glass powder and 60 wt% of ethyl cellulose, and applied to the circular plate by a silk screen method. The results of the measurement of the pattern conditions and characteristics are shown in Table 1.

Comparative Example  One

A PiG matrix was prepared in the form of a circular plate having a thickness of 0.5 mm and a diameter of 60 mm so as to include a LuAG phosphor having an emission wavelength of 550 nm and a nitride phosphor having an emission wavelength of 620 nm. The manufacturing conditions and the measurement results are shown in Table 1.

Comparative Example 1 Example 1 Example 2 Example 3 Red phosphor paste
Coating area - 100% 35% 20% Red phosphor requirement (g) 2.4 0.026 0.022 0.01 Lumens 431.5 340.5 418.9 473.5 Color coordinates
Cx 0.4464 0.4974 0.433 0.38 Cy 0.4242 0.38 0.3873 0.3873 Color temperature CCT (K) 3003.4 2038.2 2924.6 4084.1 Light efficiency (lm / Wrad.blue) 150 131 161.1 182.1 Color rendering index
CRI 74.6 79.7 84.7 80 R9 -12.6 12.6 25.4 5.8

In Table 1, unlike Comparative Example 1, which contains both the red phosphor and the green phosphor in the PiG matrix, the amount of the expensive red phosphor can be reduced by 1/100 to 1/250. Also, the physical characteristics such as color rendering index, light efficiency, and luminous flux were kept similar or high while various color temperatures were controlled. FIG. 9 shows the correlation between the pattern area area ratio and the red phosphor content and the color temperature (CCT). According to Fig. 9, the color temperature required according to the lighting apparatus can be easily adjusted to the printing area of the pattern or the content of the red phosphor.

Example  4 to Example  7: Luag  Series phosphor

A PhiG matrix (Phosphor in Glass matrix) was prepared in the form of a circular plate having a thickness of 0.5 mm and a diameter of 60 mm so as to contain 7 wt% of a LuAG phosphor (green) having an emission wavelength of 550 nm. A red phosphor paste was prepared by mixing 20 wt% of nitride phosphors (red) of 620 nm and 630 nm of luminescence wavelength, 40 wt% of glass powder, and 60 wt% of ethyl cellulose, and applied to the circular plate by a silk screen method. The results of the measurement of the pattern conditions and characteristics are shown in Table 2.

Comparative Example  2

A PiG matrix was prepared in the form of a circular plate having a thickness of 0.5 mm and a diameter of 60 mm so as to include a LuAG phosphor having an emission wavelength of 550 nm and a nitride phosphor having an emission wavelength of 620 nm. Table 2 shows the results of the measurement of the manufacturing conditions and characteristics.

Comparative Example  3

A PiG matrix was prepared in the form of a two-layer circular plate having a thickness of 0.5 mm and a diameter of 60 mm so as to include a LuAG phosphor having an emission wavelength of 550 nm and a nitride phosphor having an emission wavelength of 620 nm. Table 2 shows the results of the measurement of the manufacturing conditions and characteristics.

Comparative Example 2 Comparative Example 3 Example 4 Example 5 Example 6 Example 7
Upper layer
550 nm
(7 wt%) +
620 nm
(2.4 wt%) Luag
550 nm
7wt%
LuAG 550nm 7wt%
substratum Nitride
620 nm
7wt%
Paste
620 nm phosphor 20 wt%
Paste
630 nm phosphor 20 wt% Paste
Application (g) - - 0.09 0.11 0.09 0.11 Red phosphor
Consumption (g) 0.36 0.24 0.018 0.022 0.018 0.022 Lumens 454.4 277.2 485.7 402.1 432.5 348.1 Color coordinates
Cx 0.4397 0.4011 0.3863 0.454 0.4356 0.5052 Cy 0.4018 0.3428 0.388 0.3857 0.3846 0.3742 Color temperature CCT (K) 2933.7 3140.6 3926.6 2707.8 2855.9 1929.6 Efficiency (lm / Wrad) 167.1 101.92 179.9 148.9 160.2 128.9 Color rendering index 76.4 85.6 78.8 79.5 84.7 78

In Table 2, in the evaluation based on the LuAG-based yellow phosphor, it was confirmed that the pattern application includes two phosphors in the single layer (Comparative Example 2) or a method in which the respective phosphors are contained in the two- 3), it can be seen that the ceramic phosphor plate according to the present embodiment consumes a small amount of red phosphor and exhibits excellent characteristics. Further, when the wavelength of the red phosphor is 630 nm, the amount of the red phosphor can be further reduced.

Example  8 - Example  10: Nitride-based phosphor

(Phosphor in Glass matrix) was prepared in the form of a circular plate having a thickness of 1 mm, a thickness of 0.5 mm and a diameter of 60 mm so as to include a nitride phosphor (green) having an emission wavelength of 550 nm. A red phosphor paste was prepared by mixing 20 wt% of nitride phosphors (red) of 620 nm and 630 nm of luminescence wavelength, 40 wt% of glass powder, and 60 wt% of ethyl cellulose, and applied to the circular plate by a silk screen method. The results of the measurement of the pattern conditions and characteristics are shown in Table 3.

Comparative Example  4

A PiG matrix was prepared in the form of a circular plate having a thickness of 1 mm and a diameter of 60 mm so as to include a nitride phosphor having an emission wavelength of 550 nm and a nitride phosphor having an emission wavelength of 620 nm. The manufacturing conditions and the measurement results are shown in Table 3.

Comparative Example  5

A PiG matrix was prepared in the form of a circular plate having a thickness of 0.5 mm and a diameter of 60 mm so as to include a nitride phosphor having an emission wavelength of 550 nm and a nitride phosphor having an emission wavelength of 620 nm. The manufacturing conditions and the measurement results are shown in Table 3.

Comparative Example 4 Example 8 Example 9 Comparative Example 5 Example 10 Upper layer Nitride 550 nm 1.2 wt%
Nitride 620 nm
0.8 wt%
Nitride 550 nm 3 wt% Nitride 550 nm 1.2 wt%
Nitride 620 nm
0.8 wt% Nitride 550 nm 3 wt% substratum 620 nm
Phosphor
Paste 630 nm
Phosphor
Paste 620 nm
Phosphor
Paste Paste
Application (g) - 0.07 0.09 - 0.08 Red phosphor
Consumption (g) 0.12 0.014 0.018 0.014 0.016 Lumens 349 370.70 359.23 393 398.70 Color coordinates
Cx 0.4378 0.4722 0.4602 0.4393 0.4419 Cy 0.4073 0.4788 0.4798 0.4087 0.4138 Color temperature CCT (K) 3045.9 3010.9 3178.4 2996 2993.6 Efficiency (lm / Wrad) 112 123.73 119.9 128 146.0 Color rendering index 74.7 74.9 77.7 76.7 79.1

In FIG. 3, it was confirmed that the same effect as that of the LuAG series described above was realized when evaluating based on the nitride-based yellow phosphor. However, it was confirmed that the increase in the amount of the red phosphor was not increased even when the thickness was doubled from 500 μm to 1000 μm.

The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. The scope of the present invention should be interpreted based on the scope of the following claims and all technical ideas within the scope of equivalents thereof are to be construed as being included in the scope of the present invention. It is to be understood that the invention is not limited thereto.

100, 200, 1200: Ceramic phosphor plate
110, 210: first phosphor layer
120, 220: second phosphor layer
222: phosphor pattern
1000: Lighting device
1100: light incidence part

Claims (13)

A first phosphor layer including a short wavelength region phosphor in a translucent ceramic matrix; And
A second phosphor layer including a long wavelength region phosphor;
And the ceramic phosphor plate.
The method according to claim 1,
The above-mentioned short wavelength region fluorescent material,
Wherein the phosphor is a phosphor having a wavelength of 510 nm to 580 nm.
The method according to claim 1,
The long wavelength region fluorescent material,
A ceramic phosphor plate having a wavelength of 580 nm to 680 nm.
The method according to claim 1,
Wherein the translucent ceramic matrix comprises:
A ceramic phosphor plate comprising a borate-based ceramic, a phosphate-based ceramic or an aluminum oxide-based ceramic.
The method according to claim 1 or 4,
Wherein the short wavelength region fluorescent material is contained in the light transmitting ceramic matrix in an amount of 1 wt% to 10 wt%.
The method according to claim 1,
Wherein the second phosphor layer comprises
Wherein the first phosphor layer is formed by applying or printing a paste containing the long wavelength region fluorescent material on one surface of the first phosphor layer.
The method of claim 6,
The paste,
A ceramic phosphor plate comprising a matrix of silicate-based ceramics or polymers.
The method according to claim 6 or 7,
And the long wavelength region fluorescent material is contained in the matrix in an amount of 15 to 30% by weight.
The method according to claim 1,
Wherein the second phosphor layer comprises
Wherein a phosphor pattern is formed so as to occupy a part of the one surface area of the first phosphor layer.
The method of claim 9,
Wherein a total area of the phosphor pattern of the second phosphor layer is 20% to 100% of a surface area of the first phosphor layer.
The method of claim 9,
In the phosphor pattern,
Wherein a pattern area is 500 탆 ² to 10 ⁶ 탆 ² , respectively.
A first phosphor layer including a short wavelength region phosphor having a wavelength of 510 nm to 580 nm in a translucent ceramic matrix;
A second phosphor layer made of a long wavelength region phosphor having a wavelength of 580 nm to 680 nm; And
A light incidence portion;
≪ / RTI >
The method of claim 12,
And the long wavelength region fluorescent material is arranged at a position adjacent to the light incidence portion.

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