KR20160101262A - Wave-conversion part for light lamp apparatus and light lamp apparatus including the same - Google Patents

Abstract

According to an embodiment of the present invention, disclosed is a wavelength conversion part for a lamp device. The wavelength conversion part comprises a ceramic fluorescent substance plate in which at least one kind of a ceramic fluorescent substance from an oxide mixture matrix is dispersed wherein the oxide mixture matrix includes silicon oxide-boron oxide-zinc oxide (SiO_2-B_2O_3-ZnO). A light diffusing agent is applied onto the wavelength conversion part wherein the light diffusing agent includes at least one kind of visible ray non-absorption ceramic particle on one surface of the ceramic fluorescent substance plate.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wavelength conversion unit for a lighting apparatus,

An embodiment of the present invention relates to a lighting apparatus and a wavelength converter constituting the lighting apparatus.

White LEDs have attracted attention as a high efficiency, highly reliable white illumination light source, and some of them have already been used as a small-power small-sized light source. As the luminous efficiency increases, LEDs are widening their range as various illumination sources. However, the LED is a point light source. Since the nature of the direct light is strong and the emitted light is not a diffusion type, the angle of directivity is narrow and the portion that does not receive light becomes dark, and this forms a "light speckle ". In LED packaging and lighting, similar color temperatures should be implemented not only on the front surface but also on the side of the light output portion, so that a so-called "light spot"

As a method for widening the directivity angle, a method of attaching a lens to an encapsulating material or patterning the surface of an encapsulating material, or dispersing particles in an encapsulating material has been used. However, when ceramic particles are mixed with an encapsulating material made of resin, the particles are not dispersed or precipitated, which may cause a decrease in the light transmittance of the encapsulant. Further, when patterning the surface of the encapsulant, there is a problem that additional steps and costs are incurred due to the additional patterning process, and the phosphor plate is damaged or the strength is lowered.

Embodiments of the invention as designed to address the problems of the prior art, a silicon oxide - at least one kind of the zinc oxide _{(SiO 2 -B 2 O 3 -ZnO} ) The oxide mixture matrix containing - boron oxide A ceramic fluorescent plate on which the ceramic fluorescent substance is dispersed; And a light diffusing material including at least one kind of visible light insoluble ceramic particles is coated on one surface of the ceramic phosphor plate, and a lighting apparatus including the same.

A ceramic phosphor plate in which at least one ceramic phosphor is dispersed in an oxide mixture matrix containing silicon oxide-boron oxide-zinc oxide (SiO ₂ -B ₂ O ₃ -ZnO); And a light diffusing material including at least one kind of visible light insoluble ceramic particles is coated on one surface of the ceramic phosphor plate.

Further, in another aspect of the present embodiment, there is provided a lighting device including the above-mentioned wavelength conversion section.

According to an embodiment, there is provided a ceramic phosphor plate in which at least one ceramic phosphor is dispersed in an oxide mixture matrix containing a silicon oxide-boron oxide-zinc oxide (SiO ₂ -B ₂ O ₃ -ZnO); And a wavelength conversion unit for a lighting apparatus to which a light diffusing material containing at least one kind of visible light insufficient ceramic ceramic particles is applied on one surface of the ceramic phosphor plate and loss of transmittance and visible light region can be minimized, And the light extraction efficiency can be improved by suppressing the wave guide phenomenon in the phosphor plate, and the beam angle and uniformity of light can be improved.

1 is a cross-sectional view schematically showing a wavelength converter for a lighting apparatus according to the present embodiment.
2 is a graph showing evaluation results of the directivity angles of the present embodiment and the comparative example.
Fig. 3 is a graph showing the in-plane chromaticity deviation of this embodiment and the comparative example.
Fig. 4 shows the results of comparing the optical characteristics of this embodiment and the comparative example.

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.

1 is a cross-sectional view schematically showing a wavelength converter 100 for an illumination apparatus according to the present embodiment.

Referring to FIG. 1, a wavelength converter 100 for an illumination apparatus according to an embodiment of the present invention includes at least one kind of visible light insoluble ceramic particles (hereinafter, referred to as " visible light insoluble ceramic particles ") on one surface of a ceramic phosphor plate 110 in which at least one kind of ceramic fluorescent substance is dispersed 122 is applied to the light diffusing member 120.

In this embodiment, at least one ceramic phosphor is dispersed in an oxide mixture matrix containing a silicon oxide-boron oxide-zinc oxide (SiO ₂ -B ₂ O ₃ -ZnO). The oxide mixture is a main component of the glass forming composition, and the silicon oxide. The three components of the boron oxide and the zinc oxide (SiO ₂ , B ₂ O ₃ , ZnO) form the basic framework of the glass. Depending on the required optical properties and physical / chemical properties, additives such as aluminum oxide, bismuth oxide, and alkali metal oxides may be included. The oxide mixture may include 65 wt% to 80 wt% of the components of the ceramic phosphor plate 110. At this time, the silicon oxide may be included in an amount of 20 to 30% by weight based on the entire glass forming composition. The silicon oxide does not significantly affect the properties of the entire glass in the glass forming composition and can therefore be appropriately adjusted to the content of the other components.

The ceramic phosphor plate 110 according to the present embodiment is formed by using glass frit having a center value average particle diameter of 1 to 10 탆 obtained by vitrification of the glass forming composition for a ceramic fluorescent plate as a matrix, Type phosphor.

The glass frit is prepared by mixing the glass forming composition containing the oxide mixture and the like with a ball mill for 40 to 50 hours, and then putting it into the melting furnace. The melting temperature can be controlled and melted according to the composition of the glass forming composition. The melting temperature may be 1300 ° C to 1600 ° C, and glass may be manufactured according to a conventional glass manufacturing process. The temperature at which the raw materials contained in the glass forming composition can be homogeneously dissolved is selected and melted. At this time, if the temperature exceeds 1600 DEG C, the volatile components may increase. The melt is poured into a twin roll to prepare a glass cullet. The glass cullet is crushed to prepare a glass frit.

The glass frit may have an average particle diameter of 1 탆 to 10 탆, and preferably 2 탆 to 7 탆. When the particle size of the glass frit is reduced, the internal porosity after sintering is reduced, which is advantageous for improving the optical characteristics. If the glass frit has a particle size exceeding 10 탆, there is a fear that a large number of pores are formed when the glass frit is mixed with the phosphor and sintered later. On the other hand, when the particle size of the organic frit is less than 1 탆, it may not be sufficiently dispersed when mixed with the fluorescent material, and the fluorescent material may not be sufficiently passivated. Also, as the milling time increases, the degree of contamination increases, and it becomes difficult to maintain whiteness after sintering.

The ceramic phosphor may be one of yellow, green, and red phosphors depending on required light characteristics, color of illumination, application field, and may be one or more ceramic phosphors that excite light of different wavelengths, have. Examples of the ceramic fluorescent substance include yttrium-aluminum garnet (YAG), ruthenium-aluminum garnet (LuAG), nitride, sulfide, or silicate Can be used.

The ceramic fluorescent substance is mixed in an amount of about 10% by weight to 30% by weight with respect to the glass frit. At this time, the amount of phosphor mixture may be slightly changed depending on the transmittance and color difference after sintering. Also, the content of the phosphor varies depending on the change of the thickness. When the thickness is increased, the phosphor may be added in a reduced amount.

A mixture of the glass frit and the ceramic phosphor is put into a stainless steel mold so as to have a plate or disc shape, and fired in a firing furnace to perform firing. The sintering is performed in an air atmosphere in a typical box furnace. The sintering conditions may be performed at a temperature of 600 ° C to 700 ° C for 20 minutes to 1 hour. At this time, the temperature and time for performing the sintering can be adjusted according to the glass transition temperature (Tg) of the ceramic phosphor and the glass frit.

The light diffusing member 120 including the visible light insoluble ceramic particles 122 is formed on the ceramic phosphor plate 110 of the wavelength converter 100 for the illumination apparatus according to the present embodiment in order to improve the beam angle . In the embodiment of the present invention, the visible light insoluble ceramic particles 122 should have a bandgap of 3.3 eV or more. In addition, the visible light insufficient water repellent ceramic particles 122 are particles that do not absorb light in a visible crossover region, that is, a region having a wavelength region of 380 nm or more. Therefore, the light is reflected or transmitted without absorbing the light in the visible crosstalk region, and therefore, it may be a white-colored particle. Examples of such visible light insoluble ceramic particles 122 include white particles such as zirconium oxide (ZrO _x ), titanium oxide (TiO _x ), zinc oxide (ZnO), or magnesium oxide (MgO).

The average particle size (D50) of the visible light insoluble ceramic particles 122 may be 0.5 to 1.5 占 퐉. If the average particle size (D50) of the visible light-poor ceramic particles 122 is less than 0.1 mu m, the visible light scattering rate may be lowered and there is a fear that the visible light scattering ceramic particles 122 do not disperse to each other and flocculate. On the other hand, when the average particle size exceeds 1.5 탆, the particle size is too large, resulting in a reduction in chromaticity deviation or appearance as uneven stains.

The visible light insufficient ceramic particles 122 are applied to the heat resistant adhesive resin 124 and coated on the ceramic phosphor plate 110. At this time, the heat-resistant adhesive resin 124 can be used as a silicone resin, and is not particularly limited as long as it is not deteriorated even at 250 DEG C or higher. However, in this embodiment, when the light diffusing member 120 is coated on the ceramic phosphor plate 110, the visible light insoluble ceramic particles 122 must be applied as one layer (as shown in Fig. 1) It is preferable that the thickness of the heat resistant adhesive resin 124 is not less than 3 mu m and not more than 15 mu m. According to Embodiment 2, when the thickness is less than 3 μm, it may be difficult to realize a desired effect properly, and when the thickness is more than 15 μm, it may be difficult to realize a single process in a coating process. However, as shown in Example 2 described later, the chromaticity deviation and the characteristic of the directivity angle are improved as the thickness increases in such a range of thickness.

The visible light insufficient water repellent ceramic particles 122 may be applied in an amount of 1 wt% or less based on the weight of the ceramic fluorescent plate 110. It is preferable that the visible light insufficient water repellent ceramic particles 122 are applied as a single layer on the ceramic fluorescent plate 110 so that the visible light insufficient water repellent ceramic particles 122 exceed 1% by weight of the ceramic fluorescent plate 110 There is a possibility that the thickness of the coated light diffusing member 120 may differ depending on the position, and the directivity angle may not be improved.

According to another aspect of the present invention, there is provided an illuminating device comprising a ceramic phosphor plate in which at least one ceramic phosphor is dispersed in an oxide mixture matrix containing a silicon oxide-boron oxide-zinc oxide (SiO ₂ -B ₂ O ₃ -ZnO) A wavelength converting portion to which a light diffusing material containing at least one kind of visible light insoluble ceramic particles is applied; And a light source element.

The wavelength converter may be roughly classified into two types depending on the positional relationship with the light source device. A remote type in which the wavelength conversion unit and the light source are spaced apart from each other by a predetermined distance and a direct attach type in which the wavelength conversion unit is bonded on the light source.

The spacing type is mainly applied to illumination, and the indoor light is used for a down light module (DLM) or a spot light module (SLM). In addition, it can be applied to a street light module such as a street light for outdoor use. The integral type is applied to a high power LED packaging and is mainly used as a vehicle exterior lamp, a daytime running lamp (DRL), etc. Also, it can be used as a light source of an LED beam projector.

The spacing type prevents the wavelength conversion section from being deformed or reduced in characteristics due to heat from the light source element. On the other hand, in the case of the integrated type, since the thickness of the wavelength conversion section can be set to be thin, the size of the lighting apparatus can be greatly reduced.

In the case of the spacing type, the lighting apparatus includes a housing having a shape that widens toward the upper side from the bottom surface around the light source element mounted on the packaging. As the light source device, a solid light emitting device can be applied, for example. 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. The wavelength converter is provided at an upper end of the housing, and is disposed to be spaced apart from the light source 120. As described above, the wavelength converter according to the present embodiment is coated with a light diffusing material on a ceramic phosphor plate including a matrix made of glass frit and a ceramic fluorescent substance dispersed in a matrix. At this time, the thickness of the wavelength converting portion is 500 탆 to 1000 탆. The inside of the housing may be filled with a material having a refractive index higher than or equal to the refractive index of the wavelength converting portion.

The distance from the light source element 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 phosphor may be thermally deformed due to heat generated from the light source device.

In the case of the junction type, the light source element is mounted on the packaging in the same manner as the above-described integral type, but the wavelength conversion section is directly mounted on the light source element. In the case of the junction type, since the wavelength conversion unit is directly mounted on the light source device, the wavelength conversion unit can be directly affected by the heat of the light source device. However, the thickness of the wavelength conversion portion is 80 to 200 占 퐉, which can reduce the thickness of the integrated wavelength conversion portion. In addition, it is possible to eliminate the housing used in the integral type, and to reduce the space by the distance between the light source and the wavelength conversion unit, thereby realizing a compact size lighting apparatus.

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  One

(Si) having a mean particle size (D50) of 5 占 퐉 and a main emission peak of 540 nm and an a-SiAlON phosphor having a main emission peak of 580 nm or more, The oxide (ZrO ₂ ) was dispersed and applied by spray coating, followed by drying. At this time, the amount of zirconium oxide was added so as to be 1% based on the weight of the phosphor plate.

[ Comparative Example ]

Comparative Example  One

The same phosphor plate as in Example 1 was used, but no zirconium oxide was applied.

Comparative Example  2

Using the same phosphor plate as in Example 1, a lithographic process was performed to form a pattern (concave-convex pattern in the form of a lens array) on the surface.

[evaluation]

One. Oriented angle  Improvement evaluation

Cx and Cy values of 14000 points or more were measured in a high-output chip having a size of 980 mu m x 980 mu m to confirm the deviation. The results are shown in Table 1 and Fig .

   LED driving conditions: IF = 350mA, Tb = 25 DEG C

[Table 1]

Referring to Table 1 and FIG. 2, it can be seen that the method of applying the first embodiment of the present invention in which zirconium oxide (ZrO ₂ ) is dispersed on the surface of the phosphor plate and applied by spray coating is the best in terms of the measurement result of the orientation angle have. In addition, Comparative Example 1 and Comparative Example 2 are not only disadvantageous in terms of the characteristics of the directivity angle but also require an additional step of implementing a pattern by using a process such as photolithography, which is disadvantageous in terms of cost increase.

2. In-plane chromaticity deviation measurement

In-plane chromaticity deviations were measured with a Source Imaging Goniometer System, and the results are shown in Table 2 and FIG.

Referring to the results shown in the following Table 2 and FIG. 3, even in this case, the method of applying the first embodiment of the present invention in which zirconium oxide (ZrO ₂ ) is dispersed on the surface of the phosphor plate and applied by spray coating, Which is superior to the other Comparative Examples 1 and 2.

[Table 2]

3. Change of optical properties according to light diffusion material coating

The optical properties of the zirconium oxide particles before and after the coating of the zirconium oxide particles were measured in Example 1 (using two samples), and the differences are shown in Table 3.

[Table 3]

When the characteristics of the method of Embodiment 1 of the present invention in which zirconium oxide (ZrO ₂ ) is dispersed on the surface of the phosphor plate and applied by spray coating are compared with those in which zirconium oxide (ZrO ₂ ) is not coated, , The luminous flux increases, and it is confirmed that the color coordinates and the orientation angle are improved.

Example  2

(Si) having a mean particle size (D50) of 5 占 퐉 and a main emission peak of 540 nm and an a-SiAlON phosphor having a main emission peak of 580 nm or more, The oxide (ZrO ₂ ) was dispersed and applied by spray coating, followed by drying. At this time, the amount of zirconium oxide was added so as to be 1% based on the weight of the phosphor plate. Particularly, in Example 2, the variation of the chromaticity deviation and the directivity angle was measured by changing the thickness of the coating. As a comparative example, a phosphor plate which does not have a coating is used as a comparative group (Ref).

Table 4 and FIG. 4 show the results of comparing the optical characteristics of the second comparative group and the second comparative group.

[Table 4]

As a result of the above measurement, it can be seen that the chromaticity deviation and the directivity angle are improved compared with the comparative group (Ref) in which zirconium oxide is not coated, with reference to FIG. 4 and Table 4. Further, it can be confirmed that the chromaticity deviation and the effect of improving the directivity angle are enhanced as the coating thickness of the zirconium oxide is increased in Example 2. (Except ZrO2-1, Coating 2 times: ZrO2-2, Coating 3 times: ZrO2-3, not coated: Ref)

Also, when the material coated with the same conditions as in the above experiment was applied with ZnO (zinc oxide), as shown in Fig. 4 (ZnO coating 1 time: ZnO-1), almost the same results as those of the zirconium oxide of Example 2 were obtained You can see what you can get. Table 5 below shows the results of coating zinc oxide with other conditions being the same as in Example 2. [

[Table 5]

Also, in the case of zinc oxide, the chromaticity deviation and the effect of improving the directivity angle are increased as the coating thickness is increased.

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: Wavelength conversion unit for lighting apparatus
110: Ceramic phosphor plate
120: light diffusion material
122: visible light insoluble ceramic particles
124: Adhesive resin

Claims (12)

And a ceramic phosphor plate in which at least one ceramic phosphor is dispersed in an oxide mixture matrix containing silicon oxide-boron oxide-zinc oxide (SiO ₂ -B ₂ O ₃ -ZnO)
And a light diffusing material including at least one kind of visible light insoluble ceramic particles is coated on one surface of the ceramic phosphor plate.
The method according to claim 1,
The above-
Aluminum nitride, yttrium aluminum garnet (YAG), ruthenium-aluminum garnet (LuAG), nitride, sulfide, silicate and mixtures thereof. And at least one kind selected from the group consisting of:
The method according to claim 1,
The visible light insufficient water repellent ceramic particles may be a water-
Wherein the optical bandgap is 3.3 eV or more.
The method according to claim 1 or 3,
The visible light insufficient water repellent ceramic particles may be a water-
Wherein the wavelength conversion portion is at least one selected from the group consisting of zirconium oxide (ZrO _x ), titanium oxide (TiO _x ), zinc oxide (ZnO), and magnesium oxide (MgO).
The method according to claim 1 or 3,
The visible light insufficient water repellent ceramic particles may be a water-
And a mean particle size (D50) of 0.5 占 퐉 to 1.5 占 퐉.
The method according to claim 1,
The light-
Wherein the visible light insufficient water-repellent ceramic particles are dispersed in the heat-resistant adhesive resin and applied onto the ceramic phosphor plate.
The method of claim 6,
The light-
Wherein the thickness of the heat-resistant adhesive resin applied on the ceramic phosphor plate is 1 占 퐉 or less.
The method according to claim 1,
The visible light insufficient water repellent ceramic particles may be a water-
Wherein the weight of the ceramic phosphor plate is 1 wt% or less based on the weight of the ceramic phosphor plate.
At least one kind of visible light insoluble ceramics (hereinafter referred to as " visible light insoluble ceramics ") is formed on one surface of a ceramic phosphor plate in which at least one kind of ceramic fluorescent substance is dispersed in an oxide mixture matrix containing silicon oxide-boron oxide-zinc oxide (SiO ₂ -B ₂ O ₃ -ZnO) A wavelength converter to which a light diffusing material containing particles is applied; And
A light source element;
≪ / RTI >
The method of claim 9,
The wavelength converter may include:
Wherein the light source is a remote type provided at a distance of 10 mm to 20 mm from the light source, or is mounted on the light source.
The method of claim 10,
Wherein the thickness of the ceramic phosphor plate of the spacing type is 500 mu m to 1000 mu m, and the thickness of the integral type ceramic phosphor plate is 80 mu m to 200 mu m.
The method of claim 9,
The light source device includes:
Wherein the at least one element is selected from the group consisting of LED, OLED, laser diode (LD), Laser and VCSEL.

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