KR102318233B1 - Composition for Manufacturing Ceramic Fluorescent Plate, Ceramic Fluorescent Plate and Light Emitting Apparatus - Google Patents

Abstract

The present invention provides a glass frit having an average particle diameter (D50) of 30 μm or less; Glass frit having an average particle diameter (D50) of 80 μm or more; And it relates to a composition for manufacturing a ceramic phosphor plate comprising a phosphor.
According to the present invention, a ceramic phosphor plate prepared by using the composition for producing a ceramic phosphor plate by a composition for producing a ceramic phosphor plate, in which the luminous flux is increased by preventing light loss by reducing the interface between glass frits, and the ceramic phosphor plate and the same A light emitting device to which a plate is applied can be provided.

Description

Composition for Manufacturing Ceramic Fluorescent Plate, Ceramic Fluorescent Plate and Light Emitting Apparatus

The present invention relates to a composition for manufacturing a ceramic phosphor plate, a ceramic phosphor plate, and a light emitting device, and more particularly, it is possible to increase the luminous flux by adjusting the particle size of the glass frit when manufacturing the phosphor in glass type phosphor plate. It relates to a composition for manufacturing a ceramic phosphor plate, a ceramic phosphor plate, and a light emitting device.

Light emitting diodes (LEDs), which have recently emerged as a promising next-generation light source, are considered as a potential replacement light source for conventional lighting devices due to their low electricity consumption, high brightness, long lifespan and environmentally friendly devices. White LED was developed by S. Nakamura of Japan. First, a blue LED chip was developed to realize the light of the entire visible ray region as an LED, and white light is produced by combining a yellow fluorescence phosphor and a blue LED. This method was first developed and is currently the most commonly used white LED. In addition, there is a method in which red, green, and blue LEDs are combined or two or more types of phosphors are combined. Epoxy has been mainly used as an LED encapsulant for phosphor application, but recently, a lot of development of a silicone encapsulant having a high refractive index, high hardness, and process efficiency has been made. However, since silicon material is an organic material and has limitations in heat resistance and UV resistance, ceramic plate phosphors are emerging recently. Ceramic plate phosphors include a ceramic sintered type, a crystallized glass type, and a glass powder sintered type. Among them, the glass powder sintered type can be viewed as the most promising technology because the content of phosphors can be freely adjusted and different kinds of phosphors can be freely mixed and used to control color coordinates and color rendering index.

On the other hand, sintered glass has a disadvantage in that the transmittance is lower than that of melting glass. That is, the PiG (Phosphor in Glass) type ceramic phosphor plate is produced by press-molding a mixture of glass frit and phosphor and then sintering. In the case of sintered glass, an interface between glass frits exists and this The transmittance is lowered by the interface, and light loss occurs.

In the conventional manufacturing process of glass frit, the transmittance of one glass frit is high, but when the glass frits are made of sintered glass, the interface between the frits does not disappear completely, so the transmittance is lowered. will occur

Embodiments of the present invention have been devised to solve the above problems, and it is possible to provide a composition for manufacturing a ceramic phosphor plate in which the luminous flux is increased by preventing light loss by reducing the interface between glass frits. .

In addition, embodiments of the present invention can provide a ceramic phosphor plate manufactured using a composition for manufacturing a ceramic phosphor plate and a light emitting device to which the plate is applied.

The present invention is to achieve the above object, the average particle diameter (D50) of 30㎛ or less glass frit (glass frit); Glass frit having an average particle diameter (D50) of 80 μm or more; And it provides a composition for manufacturing a ceramic phosphor plate comprising a phosphor.

In addition, the glass frit each has an average particle diameter (D50) of 5 to 30㎛ glass frit (glass frit); and a glass frit having an average particle diameter (D50) of 80 to 200 μm.

In addition, the content of the glass frit (glass frit) having an average particle diameter (D50) of 80㎛ or more is characterized in that 15% by volume or less.

In addition, the content of the glass frit (glass frit) having an average particle diameter (D50) of 80㎛ or more is characterized in that 5 to 15% by volume or less.

In addition, the glass frit is _{characterized in that SiO 2} -B ₂ O ₃ -ZnO-based.

In addition, the glass frit is characterized in that 40 to 80% by weight of the total _{of SiO 2} , B ₂ O ₃ and ZnO _{3 is included.}

In addition, the composition is characterized in that it further comprises at least one selected from the group consisting _{of Na 2} O, Li ₂ O, and K _{2 O.}

In addition, the phosphor is a LuAG, LuYAG, YAG, or nitride-based phosphor having an emission wavelength of 540 to 570 nm.

In addition, the phosphor is characterized by using a mixture of two types of a LuAG, LuYAG, YAG, or nitride-based phosphor having an emission wavelength of 540 to 570 nm and a SiAlON-based phosphor having an emission wavelength of 580 to 630 nm.

In addition, in order to achieve the above object, the present invention is a glass frit in which a glass frit having an average particle diameter (D50) of 30 μm or less and a glass frit having an average particle diameter (D50) of 80 μm or more are mixed. There is provided a ceramic phosphor plate prepared by adding phosphor to compression molding and then sintering.

Further, in order to achieve the above object, the present invention provides a light emitting device including a ceramic phosphor plate.

According to an embodiment of the present invention, a composition for producing a ceramic phosphor plate in which the luminous flux is increased by reducing the interface between glass frits to prevent light loss, and a ceramic phosphor plate produced using the composition for producing the ceramic phosphor plate, and A light emitting device to which the plate is applied can be provided.

1 is a comparison of the differences between the interfaces between a phosphor sintered with a glass frit having an average particle diameter (D50) of 30 μm or less and a phosphor sintered by mixing a glass frit having an average particle diameter (D50) of 80 μm according to the present invention. .
2 is a photograph of an image for measuring optical properties by assembling a remote type phosphor plate measuring jig.
3 is an optical microscope image of a ceramic phosphor plate manufactured and compared according to the content (volume %) of glass frit having a large particle size.
4 is a PL spectrum comparison result of a ceramic phosphor plate according to an embodiment of the present invention.

Hereinafter, with reference to the accompanying drawings, a preferred embodiment in which a person of ordinary skill in the art to which the present invention pertains can easily practice the present invention will be described in detail. However, it should be understood that the configuration shown in the embodiments and drawings described in this specification is only a preferred embodiment of the present invention, and there may be various equivalents and modifications that can be substituted for them at the time of the present application. . In addition, in the detailed description of the principle of operation of the preferred embodiment of the present invention, if it is determined that a detailed description of a related well-known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. The terms described below are terms defined in consideration of functions in the present invention, and the meaning of each term should be interpreted based on the content throughout this specification. The same reference numerals are used throughout the drawings to refer to parts having similar functions and functions.

Embodiments of the present invention, the average particle diameter (D50) of 30㎛ or less glass frit (glass frit); Glass frit having an average particle diameter (D50) of 80 μm or more; And it relates to a composition for manufacturing a ceramic phosphor plate comprising a phosphor.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

An embodiment of the present invention is to improve optical properties by reducing light loss between microinterfaces of a sintered body of a conventional PIG-type ceramic phosphor plate.

FIG. 2 shows the difference between the interfaces of the phosphor sintered with a glass frit having an average particle diameter (D50) of 30 μm or less and a phosphor sintered by mixing a glass frit having an average particle diameter (D50) of 80 μm according to the present invention. .

As shown in FIG. 2, by using a mixture of glass frits having a particle size of 30 μm or less and glass frit having a particle size of 80 μm or more based on D50, the interface between the glass frits is reduced and light loss is reduced, so that the ceramic phosphor plate The effect of improving the luminous flux of That is, since there is no interface inside the glass frit having a D50 of 80 μm, the luminous flux falling through the interface is prevented as much as possible.

The composition for manufacturing a ceramic phosphor plate according to the present invention uses SiO ₂ -B ₂ O ₃ -ZnO-based glass frits, and the main glass composition is SiO ₂ , B ₂ O ₃ , and ZnO ₃ types, with a total of 40 It is preferably included in the range of to 80% by weight. When less than 40% by weight is included, it is not preferable because reliability problems (physical strength reduction, elution of glass component ions, etc.) occur because the basic skeleton of the glass is not dense. It is undesirable because the content of components that play a role, such as increasing the transmittance and whiteness of , is insufficient.

_{In addition, an alkali (Na 2} O, Li ₂ O, K ₂ O) element may be added to the composition for producing a ceramic phosphor plate according to the present invention for sintering at 650° C. or less, and the content to be added may include 10 to 20% by weight. have.

In the composition for manufacturing a ceramic phosphor plate according to the present invention, glass frit is pulverized to two levels of particle size. The level with a small particle size is D50(S) 30 μm or less, and the level with a large particle size is preferably controlled to be D50(L) 80 μm or more, and more preferably, the level with a small particle size is D50(S) 5 to 30 μm. and the level with a large particle size can be adjusted to be D50 (L) 80 to 200 μm. When a glass frit having a particle size outside the above range is included, the blue light from the LED light source can pass through the phosphor plate as it is due to the too large particle size. It is not advisable because

Glass frit of two particle size levels is mixed and used in a certain volume ratio, and the content of glass frit having a large particle size is preferably 15% by volume or less, and more preferably 5 to 15% by volume. It is preferable to do If the glass frit having a large particle size is mixed at a concentration greater than 15% by volume, it is not preferable because the blue light transmitted without passing through the phosphor increases, so that the color coordinates are blue shifted and the luminous flux is lowered.

One embodiment of the present invention relates to a ceramic phosphor plate manufactured by mixing and sintering phosphor with the glass frit.

The phosphors that can be used can be used by mixing one or more kinds, and when one kind is mixed, LuAG, LuYAG, YAG, Nitride-based phosphors having an emission wavelength of 540 to 570 nm can be used, and when two kinds are mixed, the above 1 A SiAlON-based phosphor having an emission wavelength of 580 to 630 nm can be added to the phosphor used for species mixing.

Hereinafter, the present invention will be described in more detail through examples. These examples are only for illustrating the present invention in more detail, and it will be apparent to those of ordinary skill in the art that the scope of the present invention is not limited by these examples according to the gist of the present invention. .

[Example]

1. Glass manufacturing process

1) Oxide raw material

2) Mixing through Ball Mill (48hr)

3) Put the mixed powder in a platinum crucible and melt (1300℃, 30 minutes)

4) Pour the glass melt into the twin roller and proceed with quenching (Glass Cullet manufacturing)

5) Manufacture of glass frit by pulverizing the manufactured glass cullet using a ball mill or a jet mill to achieve a desired particle size

- During sieving after pulverization, it is separated into two levels: D50(L)=80㎛, D50(S)=10㎛.

2. Preparation of ceramic phosphor plate

1) material mixing

- When 3000K color temperature is realized: 550nm LuAG:Ce phosphor 7% by weight, 620nm Nitride phosphor 2% by weight mixed

- When 5700K color temperature is realized: 15% by weight of 550nm LuAG:Ce phosphor, 1.5% by weight of 590nm Nitride phosphor mixed

2) Compression molding (press)

- The powder mixed in the Sus mold is uniaxially pressed at room temperature (5 Ton, 3 minutes)

3) sintering

- Put the green body that has undergone the press process into the sintering furnace and sinter step by step (1st sintering: ~250℃, 1hr / 2nd sintering: sintering conditions vary depending on Glass Tg)

4) Polishing

- Polishing the surface of the plate through polishing (thickness processing): thickness of 100 ~ 200㎛

- Mirror finish with surface roughness 0.2 ~ 7㎛

3. Phosphor plate luminous flux measurement (remote type)

1) Process the ceramic phosphor plate to a diameter of 24mm and a thickness of 120㎛

2) As shown in FIG. 2, it was assembled on a jig for measuring a remote type phosphor plate and optical properties were measured.

[Experiment result]

1. Comparison of Optical Microscopy Images

3 is an optical microscope image of a ceramic phosphor plate manufactured and compared according to the content (volume %) of glass frit having a large particle size.

In the case where glass frit having a large particle size is not mixed and used (0% by volume), the particle size of the used glass frit can be estimated based on the distance between the phosphors.

When glass frit having a large particle size is mixed, it can be confirmed that there is a transparent portion in which the phosphor is not mixed.

2. Evaluation of optical properties of ceramic phosphor plates

1) Remote type

Sample Size: 24Φ, thickness 120μm

Chip: 443~446nm, 500~510mW (@350mA)

Applied current: 1,200 mA

Separation distance between Chip & Plate: 4mm

0% One% 5% 10% 15% 20% 25% Luminous flux (lm) 981 985 1015 1029 1012 939 879 color coordinates Cx 0.3197 0.3198 0.3265 0.3185 0.3232 0.3056 0.2893 Cy 0.3308 0.3318 0.3318 0.3281 0.3299 0.305 0.2739

Measure the luminous flux and color coordinates according to the content (vol.%) of glass frits with a large particle size

When glass frits with a large particle size are mixed, the effect of increasing the luminous flux can be seen.

When glass frits with a large particle size are mixed over a certain concentration, the blue light transmitted without passing through the phosphor increases, causing a blue shift in color coordinates and a lower luminous flux (refer to PL spectrum).

3. Comparison of PL spectrum

4 is a PL spectrum comparison result of a ceramic phosphor plate according to an embodiment of the present invention.

When 10% by volume of glass frit with a large particle size is mixed, the blue light near 450 nm transmitted through the glass frit area increases compared to the case without mixing, and the loss of light near 560 nm converted by the phosphor is also reduced. increases

When 20% by volume of glass frit having a large particle size is mixed, the amount of blue light near 450 nm transmitted through the glass frit area increases, but there is a limit to the area that can be loaded with the phosphor, so that the light near 560 nm is more It becomes difficult to extract.

For this reason, when mixing 20% by volume or more, the luminous flux is negatively affected.

Claims (11)

a first glass frit having an average particle diameter (D50) of 5 μm to 30 μm;
a second glass frit having an average particle diameter (D50) of 80 μm to 200 μm; and
comprising a phosphor;
The content of the second glass frit is 5 to 15% of the sum of the volumes of the first glass frit and the second glass frit.
delete According to claim 1,
The first glass frit and the second glass frit are SiO2-B2O3-ZnO-based phosphor plate.
4. The method of claim 3,
The phosphor plate, wherein the first glass frit and the second glass frit contain at least 40 wt% of SiO2, B2O3 and ZnO3 in total.
4. The method of claim 3,
The phosphor is LuAG, LuYAG, YAG, or a nitride-based phosphor having an emission wavelength of 540 to 570 nm.
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