KR20180091679A - poly crystal phosphor film and method for fabricating the same and vehicle lamp apparatus for using the same - Google Patents

Abstract

The present invention relates to a polycrystalline fluorescent film applicable to a high output optical element, a method of manufacturing the same, and a vehicle lamp apparatus using the same, wherein the polycrystalline fluorescent film is a mixture comprising a nanocrystal first phosphor crystal and a microfine second fluorescent crystal And the mixing ratio of the second fluorescent crystals may be lower than the mixing ratio of the first fluorescent crystals. The method for fabricating a polycrystalline fluorescent film includes the steps of preparing a second fluorescent powder including nano-sized first fluorescent particles and micro-sized second fluorescent particles, injecting the fluorescent powder into a predetermined mold, Forming a sintered body by sintering the fluorescent powder having a predetermined shape at a first temperature to produce a sintered body; sintering the sintered body to a second temperature lower than the first temperature; And sintering the second sintered body to form a polycrystalline fluorescent film.

Description

TECHNICAL FIELD [0001] The present invention relates to a polycrystalline fluorescent film, a method of manufacturing the same, and a vehicle lamp device using the same.

The present invention relates to a polycrystalline fluorescent film applicable to a high output optical device, a manufacturing method thereof, and a vehicle lamp apparatus using the same.

Generally, phosphors are used to convert blue light into white light.

For example, when a fluorescent film is formed by mixing a phosphor with a silicone resin, the fluorescent film can convert incident blue light into white light.

2. Description of the Related Art In recent years, demand for high-power light sources such as automobile head lamps and high-power lighting devices has increased, and the use of high output blue light emitting diodes and blue laser diodes has been increasing.

However, when a fluorescent film mixed with a silicone resin and a fluorescent material is applied to such a high-output blue light source, problems of deterioration and discoloration of the silicone resin occur, and light conversion efficiency is lowered due to degradation of the thermal property of the fluorescent film.

In order to reduce these problems, there have been recent attempts to apply a ceramics-type fluorescent film to a high-power blue light source. However, due to the low crystallinity of the ceramic phosphor, there is a limit to the improvement of the luminous flux and there is a limit to improve the color characteristics and thermal characteristics.

Therefore, it is necessary to develop a fluorescent film which can be applied to a high-power light source by improving luminous flux, color characteristics and thermal characteristics.

The present invention is directed to solving the above-mentioned problems and other problems. Another object of the present invention is to provide a polycrystalline fluorescent film capable of enhancing luminescence characteristics by mixing a nano-sized first fluorescent crystal and a micro-sized second fluorescent crystal at a predetermined ratio to produce a polycrystalline fluorescent film, Device.

Another object of the present invention is to provide a polycrystalline fluorescent film capable of increasing a light flux and improving thermal characteristics and color characteristics by producing a polycrystalline fluorescent film with a mixing ratio of the second fluorescent crystals lower than a mixing ratio of the first fluorescent crystals, And a vehicle lamp device using the same.

Another object of the present invention is to provide a polycrystalline fluorescent film capable of improving the luminescence characteristics by fabricating a transmission type polycrystalline fluorescent film having a relative density of the fluorescent crystals of about 98% to 99.99% and a pore ratio of about 0.5% to 2% And a vehicle lamp device using the same.

Another object of the present invention is to provide a polycrystalline fluorescent film capable of improving the luminescence characteristics by fabricating a reflective polycrystalline fluorescent film having a relative density of fluorescent crystals of about 90% to 96% and a ratio of pores of about 3% to 10% And a vehicle lamp device using the same.

Another object of the present invention is to provide a polycrystalline fluorescent film capable of controlling a surface reflection characteristic by making a position of a micro-sized second fluorescent crystal at the time of molding and manufacturing a polycrystalline fluorescent film, a method for manufacturing the same, and a vehicle lamp device using the same do.

Another object of the present invention is to provide a polycrystalline fluorescent film capable of emitting white light having a color temperature of 5500K to 6500K when a blue wavelength band light is incident thereon so that it can be applied to a headlamp light source having a reduced yellow ring phenomenon A polycrystalline fluorescent film, a manufacturing method thereof, and a vehicle lamp device using the same.

Another object of the present invention is to provide a polycrystalline fluorescent film capable of enhancing the luminous flux and expanding the range of the emission wavelength by mixing a nano-sized oxide and micro-sized fluorescent crystals at a certain ratio to produce a polycrystalline fluorescent film, And to provide a vehicle lamp apparatus using the same.

It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are not restrictive of the invention, unless further departing from the spirit and scope of the invention as defined by the appended claims. It will be possible.

The polycrystalline fluorescent film according to an embodiment of the present invention is composed of a mixture including a nano-sized first phosphor crystal and a micro-sized second fluorescent crystal, and the mixture has a mixing ratio of the second fluorescent crystal 1 < / RTI > fluorescent crystals.

According to an embodiment of the present invention, there is provided a method of fabricating a polycrystalline fluorescent film, comprising: preparing a second fluorescent powder containing nano-sized first fluorescent particles and micro-sized second fluorescent particles; Forming a sintered body by firstly sintering the fluorescent powder having a predetermined shape at a first temperature to form a sintered body at a second temperature lower than the first temperature; And sintering the second sintered body to form a polycrystalline fluorescent film.

A vehicle lamp apparatus using a polycrystalline fluorescent film according to an embodiment of the present invention includes a light source for generating light, a polycrystalline fluorescent film disposed on the light source, a reflector for reflecting light generated from the light source to change the direction of light, Wherein the polycrystalline fluorescent film comprises a mixture comprising a first fluorescent crystal of nano size and a second fluorescent crystal of micro size, and the mixture comprises a mixture ratio of the second fluorescent crystals May be lower than the mixing ratio of the first fluorescent crystals.

The polycrystalline fluorescent film according to the present invention, its manufacturing method, and effects of a vehicle lamp device using the polycrystalline fluorescent film will be described as follows.

According to at least one of the embodiments of the present invention, the nanocrystal first fluorescent crystal and the micro-sized second fluorescent crystal are mixed at a predetermined ratio to produce a polycrystalline fluorescent film, thereby improving the luminescent characteristics.

According to at least one of the embodiments of the present invention, by forming the polycrystalline fluorescent film with the mixing ratio of the second fluorescent crystals lower than the mixing ratio of the first fluorescent crystals, it is possible to increase the light flux and improve the thermal characteristics and color characteristics .

According to at least one of the embodiments of the present invention, by fabricating a transmission type polycrystalline fluorescent film having a relative density of the fluorescent crystals of about 98% to about 99.99% and a pore ratio of about 0.5% to about 2% .

According to at least one of the embodiments of the present invention, by fabricating a reflective polycrystalline fluorescent film having a relative density of fluorescent crystals of about 90% to about 96% and a ratio of pores of about 3% to about 10% Can be improved.

According to at least one of the embodiments of the present invention, the position of the micro-sized second fluorescent crystal is determined at the time of molding and production, and a polycrystalline fluorescent film is produced, whereby the surface reflection characteristic can be controlled.

According to at least one embodiment of the present invention, when a blue wavelength band light is incident, a polycrystalline fluorescent film capable of emitting white light having a color temperature of about 5500K to about 6500K can be produced, Can be applied to a reduced headlamp light source.

According to at least one of the embodiments of the present invention, the light flux can be improved and the range of the emission wavelength can be expanded by mixing the nano-sized oxide and the micro-sized fluorescent crystal in a certain ratio to produce the polycrystalline fluorescent film. Sized fluorescent crystals are not applied, so that a low-priced polycrystalline fluorescent film can be manufactured.

Further scope of applicability of the present invention will become apparent from the following detailed description. It should be understood, however, that the detailed description and specific examples, such as the preferred embodiments of the invention, are given by way of illustration only, since various changes and modifications within the spirit and scope of the invention will become apparent to those skilled in the art.

1 is a structural cross-sectional view illustrating a polycrystalline fluorescent film according to an embodiment of the present invention.
2 is a view showing a transmissive polycrystalline fluorescent film according to the present invention.
3 is a view showing a reflection type polycrystalline fluorescent film according to the present invention.
4 is a graph showing the color coordinates of a head lamp to which the polycrystalline fluorescent film according to the present invention is applied.
5 and 6 are views for explaining the sintering process of the polycrystalline fluorescent film according to the present invention.
7 is a graph showing the optical spectrum of the polycrystalline fluorescent film according to the present invention.
8 is a graph showing the thermal characteristics of the polycrystalline fluorescent film according to the present invention.
9 is a block diagram for explaining the manufacturing process of the polycrystalline fluorescent film according to the present invention.
Figs. 10 to 15 are views for explaining a step of injecting fluorescent powder into a mold. Fig.
16 to 18 are flowcharts for explaining a method of manufacturing a polycrystalline fluorescent film according to the present invention.
19 is a structural cross-sectional view illustrating a polycrystalline fluorescent film according to another embodiment of the present invention.
20 is a view showing a laser light source of a headlamp to which the polycrystalline fluorescent film of FIG. 19 is applied.
FIG. 21 is a graph showing the color coordinates of a headlamp to which the polycrystalline fluorescent film of FIG. 19 is applied.
FIG. 22 is a graph showing a light spectrum according to the polycrystalline fluorescent film of FIG. 19, and is a graph comparing the luminescent characteristics excited by the blue laser with respect to the polycrystalline fluorescent films having different material compositions.
23 is a graph comparing thermal conductivities according to nano-oxides.
24 is a graph showing the thermal characteristics of the polycrystalline sclera to which the nano-oxide is applied.
25 is a block diagram for explaining a manufacturing process of a polycrystalline fluorescent film to which a nano-oxide is applied.
26 is a cross-sectional view showing a head lamp of a vehicle using the polycrystalline fluorescent film according to the present invention.
27 is a front view showing a head lamp of a vehicle using the polycrystalline fluorescent film according to the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, wherein like reference numerals are used to designate identical or similar elements, and redundant description thereof will be omitted. The suffix "module" and " part "for the components used in the following description are given or mixed in consideration of ease of specification, and do not have their own meaning or role. In the following description of the embodiments of the present invention, a detailed description of related arts will be omitted when it is determined that the gist of the embodiments disclosed herein may be blurred. It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory and are intended to provide further explanation of the invention as claimed. , ≪ / RTI > equivalents, and alternatives.

Terms including ordinals, such as first, second, etc., may be used to describe various elements, but the elements are not limited to these terms. The terms are used only for the purpose of distinguishing one component from another.

It is to be understood that when an element is referred to as being "connected" or "connected" to another element, it may be directly connected or connected to the other element, . On the other hand, when an element is referred to as being "directly connected" or "directly connected" to another element, it should be understood that there are no other elements in between.

The singular expressions include plural expressions unless the context clearly dictates otherwise.

In the present application, the terms "comprises", "having", and the like are used to specify that a feature, a number, a step, an operation, an element, a component, But do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, or combinations thereof.

1 is a structural cross-sectional view illustrating a polycrystalline fluorescent film according to an embodiment of the present invention.

1, the polycrystalline fluorescent film 100 of the present invention is formed of a mixture including a nanocrystal first phosphor crystal 20 and a micro-sized second fluorescent crystal 10 .

Here, the mixing ratio of the second fluorescent crystals 10 may be lower than the mixing ratio of the first fluorescent crystals 20.

In one example, the mixing ratio of the second fluorescent crystals 10 to the mixture may be from about 3% to about 30%.

This is because if the mixing ratio of the second fluorescent crystals 10 is about 3% or less, the light flux is decreased and the thermal characteristics and color characteristics are lowered. If the mixing ratio of the second fluorescent crystals 10 is about 30% , And the pore ratio becomes high and the strength becomes weak.

Further, the size of the first fluorescent crystals 20 may be about 100 nm to about 1000 nm.

This is because if the size of the first fluorescent crystals 20 is about 100 nm or less, the sintered body can be advantageously produced but the luminescent characteristics can be lowered. If the size of the first fluorescent crystals 20 is about 1000 nm or more, And the strength of the sintered body is weakened.

The first fluorescent crystals 20 are preferably made of at least one of (A-Ce _x ) ₃ Al ₅ O ₁₂ wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) And X is 0.001 to 0.05).

Further, the size of the second fluorescent crystals 10 may be about 6 um to about 20 um.

This is because if the size of the second fluorescent crystals 10 is less than about 6 m, the luminescent characteristics may deteriorate. If the size of the second fluorescent crystals 10 is more than about 20 m, the sintered body is difficult to manufacture, It is because it weakens.

The second fluorescent crystals 10 are preferably composed of (A-Ce _x ) ₃ Al ₅ O ₁₂ wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) And X is 0.01 to 0.1).

The luminescent center wavelength range of the first fluorescent crystals 20 may be about 540 nm to about 550 nm and the luminescent center wavelength range of the second fluorescent crystals 10 may be about 560 nm to about 580 nm.

Therefore, the present invention can be applied to a headlamp light source as a polycrystalline fluorescent film capable of emitting white light having a color temperature of about 5500K to about 6500K when light of a blue wavelength range is incident.

Meanwhile, the polycrystalline fluorescent film 100 of the present invention can be applied to a transmission type light source or a reflection type light source.

The polycrystalline fluorescent film 100 applicable to the transmission type light source and the polycrystalline fluorescent film 100 applied to the reflective light source may have different manufacturing process conditions and may have different microstructure characteristics.

Here, the polycrystalline fluorescent film 100 applicable to the transmission type light source can emit light having a color temperature of about 5500K to about 6500K by generating light in the yellow wavelength range when light in the blue wavelength range is transmitted.

The polycrystalline fluorescent film 100 applicable to the reflection type light source can emit light having a color temperature of about 5500K to about 6500K by generating light in the yellow wavelength range when light in the blue wavelength range is reflected.

For example, in the case of the polycrystalline fluorescent film 100 that can be applied to a transmissive light source, the first and second fluorescent crystals 20 and 10 may have a relative density of about 98% to about 99.99%.

The reason is that if the relative density is about 98% or less, the transmittance of blue light is lowered and white light having a color temperature of about 5500K to about 6500K can not be emitted.

The ratio of the pores formed between the first and second fluorescent crystals 20 and 10 is such that when the relative density of the first and second fluorescent crystals 20 and 10 is about 98% to about 99.99% About 0.5% to about 2%.

This is because when the ratio of the pores is about 0.5% or less, the transmittance of blue light increases and white light having a color temperature of about 5500K to about 6500K can not be emitted. If the ratio of the pores is about 2% White light having a color temperature of about 5500K to about 6500K can not be emitted.

Further, the transmissive polycrystalline fluorescent film 100 can be subjected to a first sintering process at a first temperature and a second sintering process at a second temperature lower than the first temperature.

Here, the first sintering step is a step for densifying the transmission type polycrystalline fluorescent film 100, and the second sintering step is a step for removing a defect in the transmission type polycrystalline fluorescent film 100.

For example, the first temperature of the first sintering process may be about 1550 to about 1800 degrees when the relative density of the first and second fluorescent crystals 20, 10 is about 98% to about 99.99%.

The reason is that if the first temperature of the first sintering process is about 1550 degrees or less, a sintered body not suitable for the transmission type fluorescent film is formed, and if the first temperature of the first sintering process is about 1800 degrees or more, The first and second fluorescent crystals 20 and 10 are not produced.

The second temperature of the second sintering process is preferably set so that the relative density of the first and second fluorescent crystals 20 and 10 is lower than the first temperature of the first sintering process when the relative density of the first and second fluorescent crystals 20 and 10 is about 98% Lt; RTI ID = 0.0 > 400 C. < / RTI >

The reason is that if the second temperature of the second sintering process is too low, it is difficult to remove the defects, so that the luminescence properties due to the residual foreign matter are lowered. If the second temperature of the second sintering process is too high, , And a part of the second fluorescent crystals 20, 10 may be damaged.

In the case of the polycrystalline fluorescent film 100 applicable to the reflection type light source, the relative density of the first and second fluorescent crystals 20 and 10 may be about 90% to about 96%.

When the relative density is about 90% or less, the white light having a color temperature of about 5500K to about 6500K can not be emitted because the reflectance of light is too high when light in the blue wavelength range is reflected. When the relative density is about 96% The reflectance of light is too low to emit white light having a color temperature of about 5500K to about 6500K when light of a blue wavelength band is reflected.

The ratio of the pores formed between the first and second fluorescent crystals is about 3% to about 10% when the relative density of the first and second fluorescent crystals 20 and 10 is about 90% to about 96% 10%. ≪ / RTI >

This is because when the ratio of the pores is about 3% or less, the reflectance of blue light is lowered and white light having a color temperature of about 5500K to about 6500K can not be emitted. When the ratio of pores is about 10% White light having a color temperature of about 5500K to about 6500K can not be emitted.

Also, the reflective polycrystalline fluorescent film 100 can be subjected to a first sintering process at a first temperature and a second sintering process at a second temperature lower than the first temperature.

Here, the first sintering step is a step for densifying the reflective polycrystalline fluorescent film 100, and the second sintering step is a step for removing a defect in the reflective polycrystalline fluorescent film 100 .

For example, the first temperature of the first sintering process may be about 1450 to about 1700 degrees when the relative density of the first and second fluorescent crystals 20, 10 is about 90% to about 96%.

This is because if the first temperature of the first sintering process is about 1450 degrees or less, sintering of the fluorescent film is not achieved, and if the first temperature of the first sintering process is about 1700 degrees or more, the sintered body becomes too dense, Type sintered body which is not suitable for the fluorescent film is formed.

The second temperature of the second sintering process is set to be lower than the first temperature of the first sintering process when the relative density of the first and second fluorescent crystals 20 and 10 is about 90% to about 96% Lt; RTI ID = 0.0 > 400 C. < / RTI >

The reason is that if the second temperature of the second sintering process is too low, it is difficult to remove the defects, so that the luminescence properties due to the residual foreign matter are lowered. If the second temperature of the second sintering process is too high, , And a part of the second fluorescent crystals 20, 10 may be damaged.

In some cases, in the case of the reflective polycrystalline fluorescent film 100, the first and second fluorescent crystals 20 and 10 made of a luminescent fluorescent material and the third fluorescent luminescent material (not shown) made of a non-luminescent fluorescent material are included You may.

The reason for this is to improve the surface reflection characteristic.

In some cases, the present invention can control the surface reflection characteristic by controlling the mixing ratio of the first and second fluorescent crystals 20 and 10 made of the luminescent fluorescent substance and the third fluorescent substance made of the non-luminescent fluorescent substance , And the yellow ring phenomenon may be removed.

The phenomenon of yellow ring is a phenomenon in which the periphery of the center of the white light emitted from the laser and the light emitting diode light source shows yellow color.

Here, the difference between the thermal expansion coefficients of the first and second fluorescent crystals 20 and 10 and the third fluorescent crystals may be 0 to about 2.0 x 10 ^-6 / K.

The reason is that if the difference in the coefficient of thermal expansion is large, a crystal suitable for the reflection type fluorescent film can not be obtained and the optical characteristics may be deteriorated.

For example, the first and second fluorescent crystals 20 and 10 have a thermal expansion coefficient of about 8.0 × 10 ^-6 / K to about 9.0 × 10 ^-6 / K, and the thermal expansion coefficient of the third fluorescent crystal is about 6.0 × 10 ^-6 / K to about 9.0 × 10 ^-6 / K.

The first fluorescent crystals 20 are preferably made of at least one of (A-Ce _x ) ₃ Al ₅ O ₁₂ wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) And X is from 0.001 to 0.05), but the present invention is not limited thereto.

Next, the second fluorescent crystals 10 are prepared by mixing (A-Ce _x ) ₃ Al ₅ O ₁₂ (wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) And X is from 0.01 to 0.1), but the present invention is not limited thereto.

In addition, the third fluorescent _{crystals, (A) 3 Al 5 O} 12 ( wherein, A is yttrium (Y), gadolinium (Gd), at least any one of lanthanum (La), ruthenium (Lu)), Al ₂ O ₃ , and ZrO ₂ , but the present invention is not limited thereto.

Here, the third fluorescent crystals may be about 0.1 wt% to about 50 wt% with respect to the first and second fluorescent crystals 20 and 10.

This is because if the third fluorescent crystal is about 0.1 wt% or less or about 50 wt% or more with respect to the first and second fluorescent crystals 20 and 10, the surface reflection characteristic of the fluorescent film may be deteriorated.

As described above, the polycrystalline fluorescent film 100 including the first and second fluorescent crystals 20 and 10 generates light in the yellow wavelength range when light of the blue wavelength band is incident, and the color temperature of about 5500K to about 6500K Can be emitted.

Accordingly, the present invention can increase the luminescence characteristics by mixing a first fluorescent crystal of nano size and a second fluorescent crystal of micro size at a predetermined ratio to produce a polycrystalline fluorescent film.

Further, the present invention can increase the light flux and improve the thermal characteristics and the color characteristics by making the polycrystalline fluorescent film with the mixing ratio of the second fluorescent crystals lower than the mixing ratio of the first fluorescent crystals.

Further, the present invention can improve the luminescent characteristics by fabricating a transmission type polycrystalline fluorescent film having a relative density of the fluorescent crystals of about 98% to about 99.99% and a pore ratio of about 0.5% to about 2%.

Further, the present invention can improve the luminescent characteristics by fabricating a reflective polycrystalline fluorescent film having a relative density of fluorescent crystals of about 90% to about 96% and a ratio of pores of about 3% to about 10%.

Further, in the present invention, the position of the micro-sized second fluorescent crystal is determined at the time of molding and production, and a polycrystalline fluorescent film is produced, whereby the surface reflection characteristic can be controlled.

The present invention also provides a head lamp light source having reduced yellow ring phenomenon by manufacturing a polycrystalline fluorescent film capable of emitting white light having a color temperature of about 5500K to about 6500K when blue light is incident Can be applied.

FIG. 2 is a view showing a transmissive polycrystalline fluorescent film according to the present invention, FIG. 3 is a view showing a reflective polycrystalline fluorescent film according to the present invention, and FIG. 4 is a graph showing a color coordinate of a headlamp employing the polycrystalline fluorescent film according to the present invention .

As shown in FIG. 2, when the blue light is incident on the transmission type polycrystalline fluorescent film 100, blue light transmitted through the fluorescent film and yellow light scattered by the fluorescent material are emitted to emit white light having a color temperature of about 5500K to about 6500K can do.

Here, the first and second fluorescent crystals included in the transmission type polycrystalline fluorescent film 100 may have a relative density of about 98% to about 99.99%.

The reason is that if the relative density is about 98% or less, the transmittance of blue light is lowered and white light having a color temperature of about 5500K to about 6500K can not be emitted.

The ratio of pores contained in the transmission type polycrystalline fluorescent film 100 may be about 0.5% to about 2%.

This is because when the ratio of the pores is about 0.5% or less, the transmittance of blue light increases and white light having a color temperature of about 5500K to about 6500K can not be emitted. If the ratio of the pores is about 2% White light having a color temperature of about 5500K to about 6500K can not be emitted.

In addition, it may include a first fluorescent crystal of nano size and a second fluorescent crystal of micro size included in the transmission type polycrystalline fluorescent film 100.

Here, the mixing ratio of the second fluorescent crystals may be lower than the mixing ratio of the first fluorescent crystals.

In one example, the mixing ratio of the second fluorescent crystals may be about 3% to about 30%.

The reason is that if the mixing ratio of the second fluorescent crystals is about 3% or less, the light flux is decreased and the thermal characteristics and the color characteristics are lowered. If the mixing ratio of the second fluorescent crystals is about 30% And the strength is weakened.

In addition, the size of the first fluorescent crystal contained in the transmission type polycrystalline fluorescent film 100 may be about 100 nm to about 1000 nm.

The reason is that if the size of the first fluorescent crystal is less than about 100 nm, it is advantageous for the production of the sintered body but the light emission characteristic can be lowered. If the size of the first fluorescent crystal is about 1000 nm or more, the production of the sintered body is difficult and the strength of the sintered body is weak It is because.

The first fluorescent crystal is at least one of (A-Ce _x ) ₃ Al ₅ O ₁₂ (wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) And X is 0.001 to 0.05).

In addition, the size of the second fluorescent crystals included in the transmission type polycrystalline fluorescent film 100 may be about 6 um to about 20 um.

The reason is that if the size of the second fluorescent crystal is less than about 6 탆, the luminescence characteristics may deteriorate. If the size of the second fluorescent crystal is more than about 20 탆, the sintered body is difficult to manufacture and the strength of the sintered body is weakened.

The second fluorescent crystals are at least one of (A-Ce _x ) ₃ Al ₅ O ₁₂ (wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) And X is 0.01 to 0.1).

Further, the transmissive polycrystalline fluorescent film 100 can be subjected to a first sintering process at a first temperature and a second sintering process at a second temperature lower than the first temperature.

Here, the first temperature of the first sintering process may be about 1550 to about 1800 degrees.

The reason is that if the first temperature of the first sintering process is about 1550 degrees or less, a sintered body that is not suitable for the projection type phosphor film is formed, and if the first temperature of the first sintering process is about 1800 degrees or more, It is too dense and no fluorescent crystals are produced.

In addition, the second temperature of the second sintering process may be about 300 to about 400 degrees lower than the first temperature of the first sintering process.

The reason is that if the second temperature of the second sintering process is too low, it is difficult to remove the defects, so that the luminescence properties due to the residual foreign matter are lowered. If the second temperature of the second sintering process is too high, , Part of the second fluorescent crystal may be damaged.

Next, as shown in FIG. 3, when the blue light is incident on the reflective polycrystalline fluorescent film 100, blue light reflecting the fluorescent film and yellow light scattered by the fluorescent material are emitted to have a color temperature of about 5500K to about 6500K White light can be emitted.

Here, the first and second fluorescent crystals included in the reflective polycrystalline fluorescent film 100 may have a relative density of about 90% to about 96%.

When the relative density is about 90% or less, the white light having a color temperature of about 5500K to about 6500K can not be emitted because the reflectance of light is too high when light in the blue wavelength range is reflected. When the relative density is about 96% The reflectance of light is too low to emit white light having a color temperature of about 5500K to about 6500K when light of a blue wavelength band is reflected.

The ratio of pores contained in the reflective polycrystalline fluorescent film 100 may be about 3% to about 10%.

This is because when the ratio of the pores is about 3% or less, the reflectance of blue light is lowered and white light having a color temperature of about 5500K to about 6500K can not be emitted. When the ratio of pores is about 10% White light having a color temperature of about 5500K to about 6500K can not be emitted.

Further, the size of the first fluorescent crystal contained in the reflective polycrystalline fluorescent film 100 may be about 100 nm to about 1000 nm.

The reason is that if the size of the first fluorescent crystal is less than about 100 nm, it is advantageous for the production of the sintered body but the light emission characteristic can be lowered. If the size of the first fluorescent crystal is about 1000 nm or more, the production of the sintered body is difficult and the strength of the sintered body is weak It is because.

The first fluorescent crystal is at least one of (A-Ce _x ) ₃ Al ₅ O ₁₂ (wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) And X is 0.001 to 0.05).

In addition, the size of the second fluorescent crystals included in the reflective polycrystalline fluorescent film 100 may be about 6 um to about 20 um.

The reason is that if the size of the second fluorescent crystal is less than about 6 탆, the luminescence characteristics may deteriorate. If the size of the second fluorescent crystal is more than about 20 탆, the sintered body is difficult to manufacture and the strength of the sintered body is weakened.

The second fluorescent crystals are at least one of (A-Ce _x ) ₃ Al ₅ O ₁₂ (wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) And X is 0.01 to 0.1).

Also, the reflective polycrystalline fluorescent film 100 can be subjected to a first sintering process at a first temperature and a second sintering process at a second temperature lower than the first temperature.

Here, the first temperature of the first sintering process may be about 1450 degrees to about 1700 degrees.

This is because if the first temperature of the first sintering process is about 1450 degrees or less, sintering of the fluorescent film is not achieved, and if the first temperature of the first sintering process is about 1700 degrees or more, the sintered body becomes too dense, Type sintered body which is not suitable for the fluorescent film is formed.

In addition, the second temperature of the second sintering process may be about 300 to about 400 degrees lower than the first temperature of the first sintering process.

The reason is that if the second temperature of the second sintering process is too low, it is difficult to remove the defects, so that the luminescence properties due to the residual foreign matter are lowered. If the second temperature of the second sintering process is too high, , Part of the second fluorescent crystal may be damaged.

4, in the polycrystalline phosphor having a short wavelength characteristic, the color coordinate line moves to the A region based on the blue light and the color coordinate line moves to the B region based on the blue light in the polycrystalline phosphor having the long wavelength characteristic Located.

Thus, when the color coordinate line of the polycrystalline phosphor is located in the region B, optical characteristics and color characteristics satisfying the headlamp color coordinate standard of the vehicle can be stably obtained.

Accordingly, the polycrystalline fluorescent film of the present invention in which the first and second polycrystalline fluorescent materials are mixed can improve the light flux and improve the thermal characteristics and color characteristics, because the color coordinate lines are located in the region B, It can be suitably applied to a high-power light source.

Further, since the polycrystalline fluorescent film of the present invention emits white light having a color temperature of about 6000K as in the light spectrum B, it can be suitably applied to a high output light source such as a head lamp light source of a vehicle.

5 and 6 are views for explaining the sintering process of the polycrystalline fluorescent film according to the present invention.

The polycrystalline fluorescent film 100 according to the present invention may be composed of a mixture including a nanocrystal first fluorescent crystal 20 and a micro-sized second fluorescent crystal 10.

Here, the mixing ratio of the second fluorescent crystals 10 may be lower than the mixing ratio of the first fluorescent crystals 20.

5, the polycrystalline fluorescent film 100 is subjected to a first sintering process at a first temperature and then to a second sintering process at a second temperature lower than the first temperature, Can be performed.

Here, the first sintering step is a step for densifying the polycrystalline fluorescent film 100, and the second sintering step is a step for removing a defect in the polycrystalline fluorescent film 100.

As an example, the first temperature of the first sintering process may be from about 1450 degrees to about 1800 degrees.

The reason is that if the first temperature of the first sintering process is about 1450 degrees or less, a sintered body that is not suitable for the polycrystalline fluorescent film is formed, and if the first temperature of the first sintering process is about 1800 degrees or more, It is too dense and no fluorescent crystals are produced.

The second temperature of the second sintering process may be about 300 to about 400 degrees lower than the first temperature of the first sintering process.

The reason is that if the second temperature of the second sintering process is too low, it is difficult to remove the defects, so that the luminescence properties due to the residual foreign matter are lowered. If the second temperature of the second sintering process is too high, Some may be damaged.

Further, the polycrystalline fluorescent film 100 of the present invention can be applied to a transmission type light source or a reflection type light source.

The polycrystalline fluorescent film 100 applicable to the transmission type light source and the polycrystalline fluorescent film 100 applied to the reflective type light source may have different sintering process temperature conditions.

For example, in the case of a transmissive polycrystalline fluorescent film, the first temperature of the first sintering process may be about 1550 to about 1800 degrees.

The reason is that if the first temperature of the first sintering process is about 1550 degrees or less, a sintered body that is not suitable for the projection type phosphor film is formed, and if the first temperature of the first sintering process is about 1800 degrees or more, It is too dense and no fluorescent crystals are produced.

In the case of the transmission type polycrystalline fluorescent film, the second temperature of the second sintering process may be about 300 to about 400 degrees lower than the first temperature of the first sintering process.

The reason is that if the second temperature of the second sintering process is too low, it is difficult to remove the defects, so that the luminescence properties due to the residual foreign matter are lowered. If the second temperature of the second sintering process is too high, Some may be damaged.

In the case of the reflective polycrystalline fluorescent film, the first temperature of the first sintering step may be about 1450 to about 1700 degrees.

This is because if the first temperature of the first sintering process is about 1450 degrees or less, sintering of the fluorescent film is not achieved, and if the first temperature of the first sintering process is about 1700 degrees or more, the sintered body becomes too dense, Type sintered body which is not suitable for the fluorescent film is formed.

In the case of the reflective polycrystalline fluorescent film, the second temperature of the second sintering process may be about 300 to about 400 degrees lower than the first temperature of the first sintering process.

The reason is that if the second temperature of the second sintering process is too low, it is difficult to remove the defects, so that the luminescence properties due to the residual foreign matter are lowered. If the second temperature of the second sintering process is too high, (10) may be damaged.

FIG. 7 is a graph showing the optical spectrum of the polycrystalline fluorescent film according to the present invention, and FIG. 8 is a graph showing the thermal characteristics of the polycrystalline fluorescent film according to the present invention.

As shown in FIG. 7, the polycrystalline fluorescent film containing only the nano-sized first fluorescent crystal has a luminescent center wavelength range of about 540 nm to about 550 nm as in the light spectrum A, The second polycrystalline fluorescent film of the present invention having the second fluorescent crystals of the size of about 560 nm to about 580 nm has a light emission center wavelength range of about 560 nm to about 580 nm as in the light spectrum B, Can be suitably applied.

8, the polycrystalline fluorescent film containing only the nano-sized first fluorescent substance crystals has a thermal stability of about 93% at about 200 degrees, but the nano-sized first fluorescent crystals and the micro- Since the polycrystalline fluorescent film of the present invention in which the fluorescent crystals are mixed has a thermal stability of about 94% at about 200 degrees, it can be suitably applied to a high output light source such as a head lamp light source of a vehicle.

The polycrystalline fluorescent film of the present invention in which the nano-sized first fluorescent crystals and the micro-sized second fluorescent crystals are mixed can emit white light having a color temperature of about 5500K to about 6500K when light of a blue wavelength range is incident As a polycrystalline fluorescent film, and can be applied to a headlamp light source.

9 is a block diagram for explaining the manufacturing process of the polycrystalline fluorescent film according to the present invention.

9, the first step 210 is a step of preparing a fluorescent powder 30 in which nano-sized first fluorescent particles 34 and micro-sized second fluorescent particles 32 are mixed .

Here, in the fluorescent powder 30, the blending ratio of the second fluorescent particles 32 may be lower than the blending ratio of the first fluorescent particles 34.

For example, the mixing ratio of the second fluorescent particles 32 to the fluorescent powder 30 may be about 3% to about 30%.

The reason is that if the blending ratio of the second fluorescent particles is about 3% or less, the light flux is decreased and thermal characteristics and color characteristics are lowered, and if the blending ratio of the second fluorescent particles is about 30% And the strength is weakened.

Further, the size of the first fluorescent particles 34 may be about 100 nm to about 1000 nm.

This is because if the size of the first fluorescent particles is about 100 nm or less, it is advantageous for producing a sintered body, but the emission characteristics may be deteriorated. When the size of the first fluorescent particles is about 1000 nm or more, the sintered body is difficult to manufacture, It is because.

The first fluorescent particles 34 may be at least one selected from the group consisting of (A-Ce _x ) ₃ Al ₅ O ₁₂ wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) And X is 0.001 to 0.05).

In addition, the size of the second fluorescent particles 34 may be about 6 um to about 20 um.

The reason for this is that if the size of the second fluorescent particles is less than about 6 탆, the luminescent properties may be lowered, and if the size of the second fluorescent particles is more than about 20 탆, the sintered body is difficult to manufacture and the strength of the sintered body is weakened.

The second fluorescent particles 32 may be at least one selected from the group consisting of (A-Ce _x ) ₃ Al ₅ O ₁₂ wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) And X is 0.01 to 0.1).

In another case, the fluorescent particles contained in the fluorescent powder 30 may include first and second fluorescent particles 34 and 32 made of a luminescent fluorescent material and third fluorescent particles made of a non-luminescent fluorescent material.

Here, the first and second fluorescent particles 34 and 32 and the third fluorescent particle may have a difference in thermal expansion coefficient of 0 to 2.0 × 10 ^-6 / K.

For example, the first and second fluorescent particles 34 and 32 have a thermal expansion coefficient of about 8.0 × 10 ^-6 / K to 9.0 × 10 ^-6 / K, and the thermal expansion coefficient of the third fluorescent particle is about 6.0 × 10 ^-6 / K to 9.0 10 ^-6 / K.

The first fluorescent particles 34 may be at least one selected from the group consisting of (A-Ce _x ) ₃ Al ₅ O ₁₂ (where A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) And X is 0.001 to 0.05), and the second fluorescent particles 32 may be (A-Ce _x ) ₃ Al ₅ O ₁₂ , where A is yttrium (Y), gadolinium (Gd) (A) ₃ Al ₅ O ₁₂ (where A is yttrium (Y), yttrium (Y), and y is at least one of La, La, and X is 0.01 to 0.1) But is not limited to, at least one of gadolinium (Gd), lanthanum (La), and ruthenium (Lu), Al ₂ O ₃ , and ZrO ₂ .

Next, the second step 220 is a step of injecting the fluorescent powder 30 into the predetermined mold 40 and molding the fluorescent powder 30 into a predetermined shape.

Here, the second fluorescent particles 32 of the fluorescent powder 30 to be injected into the predetermined mold 40 can be uniformly distributed in the upper and lower portions of the mold 40.

However, the second fluorescent particles 32 of the fluorescent powder 30 to be injected into the predetermined mold 40 may be distributed unevenly on the upper and lower sides of the mold 40, as the case may be.

The number of the second fluorescent particles 32 of the fluorescent powder to be injected into the predetermined mold 40 can be increased by the number of the second fluorescent particles 32 of the fluorescent powder injected into the upper region and the lower region of the predetermined mold 40 May be smaller than the number of the second fluorescent particles 32 of the fluorescent powder to be injected into the central region between the upper region and the lower region of the predetermined mold 40.

The number of the second fluorescent particles 32 of the fluorescent powder to be injected into the predetermined mold 40 may gradually increase from the upper region or the lower region of the predetermined mold 40 toward the central region.

The number of the second fluorescent particles 32 of the fluorescent powder to be injected into the predetermined mold 40 is larger than the number of the second fluorescent particles 32 of the fluorescent powder to be injected into the upper region and the lower region of the predetermined mold 40, May be greater than the number of the second fluorescent particles 32 of the fluorescent powder injected into the central region between the upper and lower regions of the predetermined mold 40.

As another example, the number of the second fluorescent particles 32 of the fluorescent powder to be injected into the predetermined mold 40 may gradually become smaller toward the central region in the upper region or the lower region of the predetermined mold 40.

As another example, the second fluorescent particles 32 of the fluorescent powder to be injected into the predetermined mold 40 may be located only in the upper region or the lower region of the predetermined mold 40.

As another example, the second fluorescent particles 32 of the fluorescent powder to be injected into the predetermined mold 40 may be located only in the central region between the upper region and the lower region of the predetermined mold 40.

Next, in a third step 230, the fluorescent powder having a predetermined shape is firstly sintered at a first temperature to produce a sintered body 50, and the sintered body 50 subjected to the first sintering is sintered at a second temperature lower than the first temperature And the second sintering is performed at a temperature.

Here, the first temperature of the first sintering may be about 1550 to about 1800 degrees or about 1450 to about 1700 degrees.

The second temperature of the second sintering may be a temperature which is 300 to 400 degrees lower than the first temperature of the first sintering.

The fourth step 240 is a step of forming a polycrystalline fluorescent film by processing the sintered body 50 which is secondarily sintered.

Here, the polycrystalline fluorescent film may be a mixture including a nano-sized first fluorescent crystal and a micro-sized second fluorescent crystal.

At this time, the mixing ratio of the second fluorescent crystals may be lower than the mixing ratio of the first fluorescent crystals.

As an example, the mixing ratio of the second fluorescent crystals to the mixture may be from about 3% to about 30%.

Further, the size of the first fluorescent crystals may be about 100 nm to about 1000 nm, and the size of the second fluorescent crystals may be about 6 um to about 20 um.

Further, the polycrystalline fluorescent film includes first and second fluorescent crystals and pores formed between the first and second fluorescent crystals, and the first and second fluorescent crystals have a relative density of 98% to 99.99% , And the pore ratio may be 0.5% to 2%.

The polycrystalline fluorescent film 100 includes first and second fluorescent crystals and pores formed between the first and second fluorescent crystals. The first and second fluorescent crystals have a relative density of 90% To 96%, and the pore ratio may be 3% to 10%.

Next, the fifth step 250 is a step of evaluating the optical characteristics of the polycrystalline fluorescent film 100.

Here, the polycrystalline fluorescent film 100 can increase the luminous flux and improve the thermal characteristics and the color characteristics by making the mixing ratio of the second fluorescent crystals lower than the mixing ratio of the first fluorescent crystals.

The polycrystalline fluorescent film 100 can emit light having a color temperature in the range of 5500K to 6500K by generating light in the yellow wavelength range when light in the blue wavelength range is incident.

Figs. 10 to 15 are views for explaining a step of injecting fluorescent powder into a mold. Fig.

10 to 15, the present invention is a method for injecting nano-sized first fluorescent particles 34 and micro-sized second fluorescent particles 32 into a mold 40 in order to fabricate a polycrystalline fluorescent film. And sintering process is performed.

Here, the mixing ratio of the second fluorescent particles 32 may be lower than the mixing ratio of the first fluorescent particles 34.

In one example, the mixing ratio of the second fluorescent particles 32 may be about 3% to about 30%.

10, the second fluorescent particles 32 of the fluorescent powder 30 to be injected into the predetermined mold 40 can be uniformly distributed in the upper and lower portions of the mold 40.

11, the second fluorescent particles 32 of the fluorescent powder 30 to be injected into the predetermined mold 40 may be distributed nonuniformly in the upper and lower portions of the mold 40. In this case,

12, the second fluorescent particles 32 of the fluorescent powder to be injected into the predetermined mold 40 may be located only in a central region between the upper region and the lower region of the predetermined mold 40. In this case,

This is because it is advantageous to fabricate a reflection type polycrystalline fluorescent film having high reflectance on the upper and lower surfaces.

13, the second fluorescent particles 32 of the fluorescent powder to be injected into the predetermined mold 40 may be located only in the upper region or the lower region of the predetermined mold 40. In this case,

This is because it is advantageous to fabricate a transmissive polycrystalline fluorescent film having low reflectance on the upper and lower surfaces.

14, the number of the second fluorescent particles 32 of the fluorescent powder to be injected into the predetermined mold 40 is set so that the number of the fluorescent particles 32 injected into the upper region and the lower region of the predetermined mold 40 2 fluorescent particles 32 may be smaller than the number of the second fluorescent particles 32 of the fluorescent powder to be injected into the central region between the upper region and the lower region of the predetermined mold 40.

The number of the second fluorescent particles 32 of the fluorescent powder to be injected into the predetermined mold 40 may gradually increase from the upper region or the lower region of the predetermined mold 40 toward the central region.

This is because it is advantageous to fabricate a reflection type polycrystalline fluorescent film having high reflectance on the upper and lower surfaces.

15, the number of the second fluorescent particles 32 of the fluorescent powder to be injected into the predetermined mold 40 is set to be larger than the number of the second fluorescent particles 32 of the fluorescent powder to be injected into the upper region and the lower region of the predetermined mold 40 2 fluorescent particles 32 may be larger than the number of the second fluorescent particles 32 of the fluorescent powder to be injected into the central region between the upper region and the lower region of the predetermined mold 40. [

As another example, the number of the second fluorescent particles 32 of the fluorescent powder to be injected into the predetermined mold 40 may gradually become smaller toward the central region in the upper region or the lower region of the predetermined mold 40.

This is because it is advantageous to fabricate a transmissive polycrystalline fluorescent film having low reflectance on the upper and lower surfaces.

16 to 18 are flowcharts for explaining a method of manufacturing a polycrystalline fluorescent film according to the present invention.

16, first, a fluorescent powder containing nano-sized first fluorescent particles and micro-sized second fluorescent particles is prepared (S10).

Here, in the fluorescent powder, the mixing ratio of the second fluorescent particles may be lower than the mixing ratio of the first fluorescent particles.

In one example, the mixing ratio of the second fluorescent particles to the fluorescent powder may be about 3% to about 30%.

The reason is that if the blending ratio of the second fluorescent particles is about 3% or less, the light flux is decreased and thermal characteristics and color characteristics are lowered, and if the blending ratio of the second fluorescent particles is about 30% And the strength is weakened.

Further, the size of the first fluorescent particles may be about 100 nm to about 1000 nm.

This is because if the size of the first fluorescent particles is about 100 nm or less, it is advantageous for producing a sintered body, but the emission characteristics may be deteriorated. When the size of the first fluorescent particles is about 1000 nm or more, the sintered body is difficult to manufacture, It is because.

The first fluorescent particle is at least one of (A-Ce _x ) ₃ Al ₅ O ₁₂ (wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) And X is 0.001 to 0.05).

In addition, the size of the second fluorescent particles may be about 6 um to about 20 um.

The reason for this is that if the size of the second fluorescent particles is less than about 6 탆, the luminescent properties may be lowered, and if the size of the second fluorescent particles is more than about 20 탆, the sintered body is difficult to manufacture and the strength of the sintered body is weakened.

The second fluorescent particle is at least one of (A-Ce _x ) ₃ Al ₅ O ₁₂ (wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) And X is 0.01 to 0.1).

In another case, the fluorescent particles contained in the fluorescent powder may include first and second fluorescent particles composed of a luminescent fluorescent substance and third fluorescent particles composed of a non-luminescent fluorescent substance.

Here, the first and second fluorescent particles and the third fluorescent particles may have a difference in thermal expansion coefficient from 0 to 2.0 x 10 < ^-6 > / K.

For example, the first and second fluorescent particles have a thermal expansion coefficient of about 8.0 × 10 ^-6 / K to 9.0 × 10 ^-6 / K, and the third fluorescent particles have a thermal expansion coefficient of about 6.0 × 10 ^-6 / K To 9.0 x 10 < ^-6 > / K.

Here, the first fluorescent particle is at least one of (A-Ce _x ) ₃ Al ₅ O ₁₂ (wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) X is 0.001 to 0.05), and the second fluorescent particle is (A-Ce _x ) ₃ Al ₅ O ₁₂ (wherein A is yttrium (Y), gadolinium (Gd), lanthanum (A) ₃ Al ₅ O ₁₂ (wherein A is yttrium (Y), gadolinium (Gd), lanthanum (La) (La) and ruthenium (Lu)), Al ₂ O ₃ , and ZrO ₂ , but the present invention is not limited thereto.

Next, in the present invention, the fluorescent powder is injected into a predetermined mold and molded into a predetermined shape (S20)

Here, the second fluorescent particles of the fluorescent powder to be injected into the predetermined mold can be uniformly distributed in the upper part and the lower part of the mold.

However, in some cases, the second fluorescent particles of the fluorescent powder to be injected into the predetermined mold may be distributed non-uniformly on the upper and lower sides of the mold.

For example, the number of the second fluorescent particles of the fluorescent powder to be injected into the predetermined mold is set such that the number of the second fluorescent particles of the fluorescent powder to be injected into the upper region and the lower region of the predetermined mold is different between the upper region and the lower region May be less than the number of the second fluorescent particles of the fluorescent powder to be injected into the central region of the fluorescent particles.

In some cases, the number of the second fluorescent particles of the fluorescent powder to be injected into the predetermined mold may gradually increase toward the central region in the upper region or the lower region of the predetermined mold.

The number of the second fluorescent particles of the fluorescent powder to be injected into the upper and lower regions of the predetermined mold is larger than the number of the second fluorescent particles of the fluorescent powder injected into the upper and lower regions of the predetermined mold, May be larger than the number of the second fluorescent particles of the fluorescent powder to be injected into the central region between the fluorescent particles.

As another example, the number of the second fluorescent particles of the fluorescent powder to be injected into the predetermined mold may gradually become smaller toward the central region in the upper region or the lower region of the predetermined mold.

As another example, the second fluorescent particles of the fluorescent powder to be injected into the predetermined mold may be located only in the upper region or the lower region of the predetermined mold.

As another example, the second fluorescent particles of the fluorescent powder to be injected into the predetermined mold may be located only in the central region between the upper region and the lower region of the predetermined mold.

Next, in the present invention, a sintered body is firstly sintered at a first temperature (S30), and the sintered body subjected to the first sintering is secondarily sintered at a second temperature lower than the first temperature. (S40)

Here, the first temperature of the first sintering may be from about 1550 degrees to about 1800 degrees, or from about 1450 degrees to about 1700 degrees.

The second temperature of the second sintering may be a temperature which is 300 to 400 degrees lower than the first temperature of the first sintering.

Next, in the present invention, the sintered body subjected to the secondary sintering is processed (S50) to form a polycrystalline fluorescent film (S60)

Here, the polycrystalline fluorescent film includes pores formed between the nano-sized first fluorescent crystals, the micro-sized second fluorescent crystals, and the first and second fluorescent crystals, and the first and second fluorescent crystals are opposed to each other The density may be from 98% to 99.99%, and the pore ratio may be from 0.5% to 2%.

The polycrystalline fluorescent film includes a first fluorescent crystal of nano size, a second fluorescent crystal of micro size, and pores formed between the first and second fluorescent crystals, and the first and second fluorescent crystals are opposed to each other The density may be 90% to 96%, and the pore ratio may be 3% to 10%.

On the other hand, as shown in FIG. 17, the step of preparing the fluorescent powder containing the first and second fluorescent particles includes a step (S16) of preparing nano-sized first fluorescent particles and micro-sized second fluorescent particles, (S18) mixing the first fluorescent particles and the second fluorescent particles, and preparing a fluorescent powder containing the first fluorescent particles and the second fluorescent particles (S19).

18, the step of injecting the fluorescent powder into a predetermined mold and molding the fluorescent powder into a predetermined shape includes a step of preparing a mold (S21), a step of determining the position of the second fluorescent particle to be injected into the mold (S22 (S23) of confirming whether the position of the determined second fluorescent particle is the central region of the mold, and determining whether the position of the determined second fluorescent particle is the central region, (S24) of injecting a fluorescent powder containing the first fluorescent particles into the central region and into the upper and lower regions of the mold, and injecting the first fluorescent particles (S25) of injecting the fluorescent powder containing the fluorescent particles containing the second fluorescent particles into the upper and lower regions of the mold, and injecting the fluorescent powder injected into the mold into a predetermined shape A may include the step (S26) of forming.

19 is a structural cross-sectional view illustrating a polycrystalline fluorescent film according to another embodiment of the present invention.

As shown in FIG. 19, the polycrystalline fluorescent film 100 of the present invention may be composed of a mixture including a nano-sized oxide 70 and a micro-sized fluorescent crystal 60.

Here, the mixing ratio of the fluorescent crystals 60 may be lower than the mixing ratio of the oxides 70.

In one example, the mixing ratio of the fluorescent crystals 60 to the mixture may be from about 10% to about 40%.

The reason is that if the mixing ratio of the fluorescent crystals 60 is less than about 10%, the light emitting area decreases and the light flux decreases, the thermal characteristics and the color characteristics deteriorate. If the mixing ratio of the fluorescent crystals 60 is about 40% , The pore ratio becomes high, so that it is difficult to ensure compactness and the color characteristic shows yellow characteristic.

Also, the size of the oxide 70 may be about 50 nm to about 1 um.

This is because if the size of the oxide 70 is about 50 nm or less, the sintered body can be advantageously produced but the luminescent properties can be degraded. If the size of the oxide 70 is about 1 um or more, the sintered body is difficult to manufacture, It is because.

The oxide 70 is a non-luminescent YAG, for example, (A) ₃ Al ₅ O ₁₂ wherein A is yttrium (Y), gadolinium (Gd), lanthanum (La) At least one of Al ₂ O ₃ and Y ₂ O ₃ ), but is not limited thereto.

In addition, the size of the fluorescent crystals 60 may be about 6 um to about 20 um.

This is because if the size of the fluorescent crystals 60 is less than about 6 탆, the luminescence characteristics may deteriorate. If the size of the fluorescent crystals 60 is more than about 20 탆, the sintered body is difficult to manufacture and the strength of the sintered body is weakened .

The fluorescent crystals 60 are at least one of (A-Ce _x ) ₃ Al ₅ O ₁₂ wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) , And X is 0.01 to 0.1).

Further, the luminescent center wavelength range of the fluorescent crystals 60 may be about 550 nm to about 580 nm.

As described above, in the polycrystalline fluorescent film to which the nano-oxide is applied, the light flux can be improved and the range of the emission wavelength can be expanded by mixing the nano-sized oxide and the micro-sized fluorescent crystal in a certain ratio to produce the polycrystalline fluorescent film. It is possible to manufacture a low-priced polycrystalline fluorescent film.

In some cases, the polycrystalline fluorescent film to which the nano-oxide is applied may be a green luminescent oxide-based phosphor (Ba ₂ SiO ₄ , Sr ₂ SiO ₄ , SrAl ₂ O ₄ , Sr ₄ Al ₁₄ O ₂₅ ), an amber-emitting oxy-nitride-based phosphor (a-SiAlON, b-SiAlON), a red light emitting nitride-based phosphor (Sr ₂ Si ₅ N ₈ , Ca ₂ Si ₅ N ₈ , CaAlSiN ₃ , and LaSi ₃ N ₅ ).

In general, when a polycrystalline fluorescent film is fabricated through a molding and sintering process using only a nano-sized phosphor having a weak crystallinity, there is a limit in improving the luminous flux due to low crystallinity.

In the case of fabricating a polycrystalline fluorescent film using only a nano-sized phosphor, it is necessary to increase the Gd content and Ce content in order to change the color characteristics. However, since the increase in Gd and Ce causes a decrease in thermal characteristics, .

In addition, when a polycrystalline fluorescent film is fabricated using only a micro-sized phosphor, high crystallinity is achieved and high luminous flux characteristics can be realized. However, when the color characteristic is shifted to a long wavelength due to composition change, thermal property deterioration is low, .

That is, the polycrystalline fluorescent film made only of a micro-sized phosphor has a low density of sintered body and has a relative density of about 90% or less, which is likely to be broken, heat is accumulated in pores, , A light beam drop may occur.

In addition, the polycrystalline fluorescent film made only of a micro-sized fluorescent material has a blue reflectance lower than that of the target, so that it may show a color characteristic of yellow instead of white.

Therefore, when a composite sintered body is manufactured by mixing a nano-sized oxide and a micro-sized phosphor as in the present invention, the polycrystalline fluorescent film can improve the light flux and broaden the range of the emission wavelength, So that a low-priced polycrystalline ceramic phosphor can be produced.

That is, when a small amount of microphosphorescent material and nano-oxide are mixed and sintered to form an oxide-coated polycrystalline fluorescent film, the polycrystalline fluorescent film to which the oxide is applied is dense and the color characteristic is improved and the production cost can be reduced.

Therefore, the present invention can be applied to a headlamp light source as a polycrystalline fluorescent film capable of emitting white light having a color temperature of about 5500K to about 6500K when light of a blue wavelength range is incident.

Meanwhile, the polycrystalline fluorescent film 100 to which the oxide of the present invention is applied can be applied to a reflective light source.

The polycrystalline fluorescent film 100 applicable to the reflection type light source can emit light having a color temperature of about 5500K to about 6500K by generating light in the yellow wavelength range when light in the blue wavelength range is reflected.

In the case of a polycrystalline fluorescent film 100 that can be applied to a reflective light source, the oxide 70 and the fluorescent crystals 60 may have a relative density of about 90% to about 96%.

When the relative density is about 90% or less, the white light having a color temperature of about 5500K to about 6500K can not be emitted because the reflectance of light is too high when light in the blue wavelength range is reflected. When the relative density is about 96% The reflectance of light is too low to emit white light having a color temperature of about 5500K to about 6500K when light of a blue wavelength band is reflected.

The ratio of the pores formed between the oxide 70 and the fluorescent crystals 60 is about 3% to about 60% when the relative density of the oxide 70 and the fluorescent crystals 60 is about 90% to about 96% 10%. ≪ / RTI >

This is because when the ratio of the pores is about 3% or less, the reflectance of blue light is lowered and white light having a color temperature of about 5500K to about 6500K can not be emitted. When the ratio of pores is about 10% White light having a color temperature of about 5500K to about 6500K can not be emitted.

Further, the reflection type polycrystalline fluorescent film 100 can perform a single sintering step.

Here, the sintering process is a process for densifying the polycrystalline fluorescent film 100 and removing defects in the polycrystalline fluorescent film 100.

As an example, the temperature of the sintering process may be from about 1500 degrees to about 1700 degrees, and the sintering process may be performed in a nitrogen atmospheric environment.

If the temperature of the sintering process is about 1500 degrees or less, sintering of the fluorescent film is not performed, and if the temperature of the sintering process is about 1700 degrees or more, the sintered body becomes too dense and is not suitable for the reflective fluorescent film. Is formed.

Further, since the oxide-applied polycrystalline fluorescent film is manufactured by only one sintering process without applying a vacuum process in the sintering process, the process cost can be further reduced.

As described above, in the polycrystalline fluorescent film to which the nano-oxide is applied, the light flux can be improved and the range of the emission wavelength can be expanded by mixing the nano-sized oxide and the micro-sized fluorescent crystal in a certain ratio to produce the polycrystalline fluorescent film. It is possible to manufacture a low-priced polycrystalline fluorescent film.

20 is a view showing a laser light source of a headlamp to which the polycrystalline fluorescent film of FIG. 19 is applied.

As shown in FIG. 20, the polycrystalline fluorescent film 100 to which an oxide is applied can be applied to a reflection type light source such as a head lamp of a vehicle.

Here, the polycrystalline fluorescent film 100 can emit white light having a color temperature of about 5500K to about 6500K by generating light in the yellow wavelength range when light in the blue wavelength range is reflected.

In the case of the polycrystalline fluorescent film 100 applied to the reflection type light source, the oxide 70 and the fluorescent crystal 60 may have a relative density of about 90% to about 96%.

When the relative density is about 90% or less, the white light having a color temperature of about 5500K to about 6500K can not be emitted because the reflectance of light is too high when light in the blue wavelength range is reflected. When the relative density is about 96% The reflectance of light is too low to emit white light having a color temperature of about 5500K to about 6500K when light of a blue wavelength band is reflected.

The ratio of the pores formed between the oxide 70 and the fluorescent crystals 60 is about 3% to about 60% when the relative density of the oxide 70 and the fluorescent crystals 60 is about 90% to about 96% 10%. ≪ / RTI >

This is because when the ratio of the pores is about 3% or less, the reflectance of blue light is lowered and white light having a color temperature of about 5500K to about 6500K can not be emitted. When the ratio of pores is about 10% White light having a color temperature of about 5500K to about 6500K can not be emitted.

Next, the oxide-applied polycrystalline fluorescent film 100 may be composed of a mixture including a nano-sized oxide 70 and a micro-sized fluorescent crystal 60.

Here, the size of the oxide 70 may be about 50 nm to about 1 um, and the size of the fluorescent crystals 60 may be about 6 um to about 20 um.

The oxide 70 is a non-luminescent YAG, for example, (A) ₃ Al ₅ O ₁₂ wherein A is yttrium (Y), gadolinium (Gd), lanthanum (La) At least one of Al ₂ O ₃ and Y ₂ O ₃ ), but is not limited thereto.

The fluorescent crystals 60 are formed of at least one of (A-Ce _x ) ₃ Al ₅ O ₁₂ (wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) , And X is 0.01 to 0.1).

In some cases, the polycrystalline fluorescent film 100 to which the nano-oxide is applied may be formed of an oxide-based fluorescent material (Ba ₂ SiO ₄ , Sr ₂ SiO ₄ , SrAl ₂ O ₄ , Sr ₄ Al ₁₄ O _25), amber (amber) of the luminous oxy-nitride (oxy-nitride) based fluorescent material (a-SiAlON, b-SiAlON ), red (red) of the light-emitting nitride (nitride) based fluorescent material (Sr ₂ Si ₅ N ₈ , Ca ₂ Si ₅ N ₈ , CaAlSiN ₃ , and LaSi ₃ N ₅ ).

As described above, in the polycrystalline fluorescent film to which the nano-oxide is applied, the light flux can be improved and the range of the emission wavelength can be expanded by mixing the nano-sized oxide and the micro-sized fluorescent crystal in a certain ratio to produce the polycrystalline fluorescent film. The present invention can be applied to a reflection type laser light source such as a head lamp of a vehicle because it is possible to manufacture a low cost polycrystalline fluorescent film.

FIG. 21 is a graph showing the color coordinates of a headlamp to which the polycrystalline fluorescent film of FIG. 19 is applied.

As shown in Fig. 21, the polycrystalline fluorescent film (a) applied only to the nano-fluorescent material is located in the boundary region of the color coordinate of the headlamp, and the polycrystalline fluorescent film (b) applied only to the micro-fluorescent material is located outside the color coordinate area On the other hand, it can be seen that the polycrystalline fluorescent film (c) to which the oxide is applied is located within the color coordinate region of the headlamp.

The reason for this is as follows. In the case of the fluorescent film (a) using only the nano-phosphors, there is a limit to the improvement of the luminous flux due to the low crystallinity, and the thermal characteristics are lowered due to Gd and Ce added for color characteristic change. In the case of the fluorescent film (b) applied only with a microphosphor, the high crystallinity is high and high luminous flux characteristics can be realized. However, when the color characteristic is shifted to a long wavelength due to the composition change, This is because the light flux may be lowered during driving.

That is, the fluorescent film (b) applied only to the microphosphor is likely to be damaged due to the low density of the sintered body because the sintered body has a relative density of about 90% or less and heat is accumulated in the pores, , A light beam drop may occur.

Further, the fluorescent film (b) applied only to the microphosphorescence has a blue reflectance lower than that of the target, so that the fluorescent film (b) can exhibit a color characteristic of yellow instead of white.

On the other hand, as in the present invention, the polycrystalline fluorescent film (c) to which the nano-oxide is applied can be manufactured at a low cost since the luminous flux can be improved and the range of the emission wavelength can be expanded and the expensive nano- .

That is, the oxide-applied polycrystalline fluorescent film (c) which is sintered by mixing a microphosphor and a nano-oxide is dense and can be fabricated at a low cost with improved color characteristics.

Therefore, the polycrystalline fluorescent film (c) to which the nano-oxide is applied can emit white light having a color temperature of about 5500K to about 6500K when the light of blue wavelength is incident, so that it can be suitably applied to a high output light source such as a head lamp .

FIG. 22 is a graph showing a light spectrum according to the polycrystalline fluorescent film of FIG. 19, and is a graph comparing the luminescent characteristics excited by the blue laser with respect to the polycrystalline fluorescent films having different material compositions.

As shown in Fig. 22, the polycrystalline fluorescent film applied only to the nanophosphor has a luminescent center wavelength range of about 540 nm to about 550 nm, as in the optical spectrum A, and the polycrystalline fluorescent film applied only to the microphosphor, The central wavelength range may be from about 560 nm to about 580 nm.

On the other hand, as in the present invention, the polycrystalline fluorescent film to which the oxide is applied, as in the optical spectrum C, has a luminescent center wavelength range of about 550 nm to about 580 nm, Can be confirmed.

Therefore, the polycrystalline fluorescent film to which the oxide is applied can be applied to a high-output light source such as a head lamp light source of a vehicle with improved luminescence characteristics.

FIG. 23 is a graph comparing thermal conductivities according to nano-oxides, and FIG. 24 is a graph showing thermal characteristics according to a polycrystalline scleral applied with nano-oxide.

The polycrystalline fluorescent film of the present invention may be composed of a mixture containing a nano-sized oxide and a micro-sized fluorescent crystal, wherein the oxide is a non-luminous YAG, for example, (A) ₃ Al ₅ O ₁₂ And may include at least any one of yttrium (Y), gadolinium (Gd), lanthanum (La), ruthenium (Lu), Al ₂ O ₃ and Y ₂ O ₃ . Do not.

Here, as shown in FIG. 23, it can be seen that the nano-oxide has a high thermal conductivity.

For example, the thermal conductivity of the oxide YAG is about 6 - 10, the thermal conductivity of the oxide Al ₂ O ₃ is 12 - 34, and the thermal conductivity of the oxide Y ₂ O ₃ may be 8 - 12.

Therefore, when the polycrystalline fluorescent film is manufactured by applying the nano-oxide having high thermal conductivity as in the present invention, the thermal characteristics of the polycrystalline fluorescent film can be greatly improved due to the high thermal conductivity characteristics of the nano-oxide forming the matrix.

24, the polycrystalline fluorescent film (b) to which only the microphosphor is applied has a thermal stability of about 92% at about 200 degrees. However, the polycrystalline fluorescent film of the present invention, to which the nano-oxide is applied, Since the stability is about 96%, the thermal characteristics are improved and can be suitably applied to a high output light source such as a head lamp light source of a vehicle.

In addition, the polycrystalline fluorescent film of the present invention to which nano-oxide is applied can be applied to a headlamp light source as a polycrystalline fluorescent film capable of emitting white light having a color temperature of about 5500K to about 6500K when blue light is incident.

25 is a block diagram for explaining a manufacturing process of a polycrystalline fluorescent film to which a nano-oxide is applied.

As shown in FIG. 25, the first step is a step of preparing a fluorescent powder 80 in which nano-sized oxide particles 84 and micro-sized fluorescent particles 82 are mixed.

Here, in the fluorescent powder 80, the blending ratio of the fluorescent particles 82 may be lower than the blending ratio of the oxide particles 84.

In one example, the mixing ratio of the fluorescent particles 82 to the fluorescent powder 80 may be about 3% to about 30%.

This is because if the mixing ratio of the fluorescent particles is about 3% or less, the light flux is decreased and the thermal characteristics and color characteristics are lowered. If the mixing ratio of the fluorescent particles is about 30% or more, the pore ratio becomes higher It is because it weakens.

Also, the size of the oxide particles 84 may be from about 50 nm to about 1 um.

The reason for this is that when the size of the oxide particles is about 50 nm or less, the sintered body can be advantageously produced but the luminescent characteristics can be deteriorated. When the size of the oxide particles is about 1 um or more, the sintered body is difficult to manufacture and the strength of the sintered body is weakened.

As the non-luminous YAG, for example, the oxide particles 84 may be formed of (A) ₃ Al ₅ O ₁₂ (where A is yttrium (Y), gadolinium (Gd), lanthanum (La) , Al ₂ O ₃ , and Y ₂ O ₃ , but the present invention is not limited thereto.

In addition, the size of the fluorescent particles 82 may be about 6 um to about 20 um.

The reason for this is that when the size of the fluorescent particles is less than about 6 탆, the luminescent characteristics may be deteriorated. When the size of the fluorescent particles is about 20 탆 or more, the production of the sintered body is difficult and the strength of the sintered body is weakened.

The fluorescent particles 82 are at least one of (A-Ce _x ) ₃ Al ₅ O ₁₂ (wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) , And X is 0.01 to 0.1).

Next, in the second step, the fluorescent powder 80 is injected into the predetermined mold 90 and molded into a predetermined shape.

Here, the fluorescent particles 82 of the fluorescent powder 80 to be injected into the predetermined mold 90 can be uniformly distributed in the upper portion and the lower portion of the mold 90.

However, in some cases, the fluorescent particles 82 of the fluorescent powder 80 to be injected into the predetermined mold 90 may be distributed non-uniformly on the upper and lower sides of the mold 90.

The number of the fluorescent particles 82 of the fluorescent powder to be injected into the upper region and the lower region of the predetermined mold 90 is smaller than the number of the fluorescent particles 82 May be less than the number of fluorescent particles 82 of the fluorescent powder to be injected into the central region between the upper region and the lower region of the mold 90.

The number of the fluorescent particles 82 of the fluorescent powder to be injected into the predetermined mold 90 may gradually increase toward the central region in the upper region or the lower region of the predetermined mold 90. [

The number of the fluorescent particles 82 of the fluorescent powder to be injected into the predetermined mold 90 is set such that the number of the fluorescent particles 82 of the fluorescent powder to be injected into the upper region and the lower region of the predetermined mold 90, May be larger than the number of the fluorescent particles 82 of the fluorescent powder to be injected into the central region between the upper region and the lower region of the predetermined mold 90.

As another example, the number of the fluorescent particles 82 of the fluorescent powder to be injected into the predetermined mold 90 may gradually become smaller toward the central region in the upper region or the lower region of the predetermined mold 90.

As another example, the fluorescent particles 82 of the fluorescent powder to be injected into the predetermined mold 90 may be located only in the upper region or the lower region of the predetermined mold 90.

As another example, the fluorescent particles 82 of the fluorescent powder to be injected into the predetermined mold 90 may be located only in the central region between the upper region and the lower region of the predetermined mold 90.

Next, in the third step, the sintered body is produced by sintering the fluorescent powder having a predetermined shape at a predetermined temperature.

Here, the sintering temperature may be about 1500 degrees to about 1700 degrees.

Next, the fourth step is a step of forming the polycrystalline fluorescent film 100 by processing the sintered body to be sintered.

Here, the polycrystalline fluorescent film 100 may be a mixture including a nano-sized oxide 70 and a micro-sized fluorescent crystal 60.

Here, the mixing ratio of the fluorescent crystals 60 may be lower than the mixing ratio of the oxides 70.

In one example, the mixing ratio of the fluorescent crystals 60 to the mixture may be from about 10% to about 40%.

The reason is that if the mixing ratio of the fluorescent crystals 60 is less than about 10%, the light emitting area decreases and the light flux decreases, the thermal characteristics and the color characteristics deteriorate. If the mixing ratio of the fluorescent crystals 60 is about 40% , The pore ratio becomes high, so that it is difficult to ensure compactness and the color characteristic shows yellow characteristic.

Also, the size of the oxide 70 may be about 50 nm to about 1 um.

This is because if the size of the oxide 70 is about 50 nm or less, the sintered body can be advantageously produced but the luminescent properties can be degraded. If the size of the oxide 70 is about 1 um or more, the sintered body is difficult to manufacture, It is because.

The oxide 70 is a non-luminescent YAG, for example, (A) ₃ Al ₅ O ₁₂ wherein A is yttrium (Y), gadolinium (Gd), lanthanum (La) At least one of Al ₂ O ₃ and Y ₂ O ₃ ), but is not limited thereto.

In addition, the size of the fluorescent crystals 60 may be about 6 um to about 20 um.

This is because if the size of the fluorescent crystals 60 is less than about 6 탆, the luminescence characteristics may deteriorate. If the size of the fluorescent crystals 60 is more than about 20 탆, the sintered body is difficult to manufacture and the strength of the sintered body is weakened .

The fluorescent crystals 60 are at least one of (A-Ce _x ) ₃ Al ₅ O ₁₂ wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) , And X is 0.01 to 0.1).

Further, the luminescent center wavelength range of the fluorescent crystals 60 may be about 550 nm to about 580 nm.

As described above, in the polycrystalline fluorescent film to which the nano-oxide is applied, the light flux can be improved and the range of the emission wavelength can be expanded by mixing the nano-sized oxide and the micro-sized fluorescent crystal in a certain ratio to produce the polycrystalline fluorescent film. It is possible to manufacture a low-priced polycrystalline fluorescent film.

In some cases, the polycrystalline fluorescent film to which the nano-oxide is applied may be a green luminescent oxide-based phosphor (Ba ₂ SiO ₄ , Sr ₂ SiO ₄ , SrAl ₂ O ₄ , Sr ₄ Al ₁₄ O ₂₅ ), an amber-emitting oxy-nitride-based phosphor (a-SiAlON, b-SiAlON), a red light emitting nitride-based phosphor (Sr ₂ Si ₅ N ₈ , Ca ₂ Si ₅ N ₈ , CaAlSiN ₃ , and LaSi ₃ N ₅ ).

FIG. 26 is a cross-sectional view showing a head lamp of a vehicle using the polycrystalline fluorescent film according to the present invention, and FIG. 27 is a front view showing a head lamp of a vehicle using the polycrystalline fluorescent film according to the present invention.

26 and 27, a head lamp 1000 of a vehicle using a polycrystalline fluorescent film includes a light source 300 for generating light, a polycrystalline fluorescent film 100 disposed on the light source 300, a light source 300 And a lens 600 for refracting the light reflected from the reflector 400. The reflector 400 reflects the light emitted from the reflector 400 and changes the direction of the light.

Here, the polycrystalline fluorescent film 100 includes pores formed between the nano-sized first fluorescent crystals, the micro-sized second fluorescent crystals, and the first and second fluorescent crystals, and the mixing ratio of the second fluorescent crystals May be lower than the mixing ratio of the first fluorescent crystals.

Further, the first and second fluorescent crystals are a composite containing at least one rare earth material and cerium (Ce), and the first and second fluorescent crystals are sintered at a first temperature and at a second temperature lower than the first temperature A sintering process can be performed.

In some cases, the polycrystalline fluorescent film 100 may be a mixture including nano-sized oxide and micro-sized fluorescent crystals, wherein the blending ratio of the fluorescent crystals may be lower than the blending ratio of the oxides.

The oxide is at least one of (A) ₃ Al ₅ O ₁₂ (where A is yttrium (Y), gadolinium (Gd), lanthanum (La), ruthenium (Lu) ), Al ₂ O ₃ , and Y ₂ O ₃ , but the present invention is not limited thereto.

The fluorescent crystals may be at least one of (A-Ce _x ) ₃ Al ₅ O ₁₂ (wherein A is at least one of yttrium (Y), gadolinium (Gd), lanthanum (La) 0.01 to 0.1).

26, the reflector 400 reflects the light emitted from the light source 300 in a predetermined direction.

The shade 500 is disposed between the reflector 400 and the lens 600 and shields or reflects a part of the light that is reflected by the reflector 400 and directed to the lens 600 to form a desired light distribution pattern Member.

Here, the height of one side 500-1 and the other side 500-2 of the shade 500 may be different from each other.

The light transmitted through the polycrystalline fluorescent film 100 of the light source 300 can be reflected by the reflector 400 and the shade 500 and then transmitted through the lens 600 and directed toward the front of the vehicle.

Here, the lens 600 refracts the light reflected by the reflector 400 forward.

27, the head lamp 1000 of the vehicle may include a light source 300 including a polycrystalline fluorescent film and a light housing 1100. [

Here, the polycrystalline fluorescent film of the light source 300 may include the embodiments described above. The light housing 1100 accommodates the light source 300, and may be made of a light transmitting material.

The vehicle light housing 1100 may include bends depending on the vehicle part and the design to be mounted.

The light source 300 including the polycrystalline fluorescent film can emit white light having a color temperature of about 5500K to about 6500K by generating light in the yellow wavelength range when light in the blue wavelength range is incident, , The yellow ring phenomenon can be reduced, the luminous flux can be improved, and the color characteristics and thermal characteristics can be improved.

Accordingly, the present invention can increase the luminescence characteristics by mixing a first fluorescent crystal of nano size and a second fluorescent crystal of micro size at a predetermined ratio to produce a polycrystalline fluorescent film.

Further, the present invention can increase the light flux and improve the thermal characteristics and the color characteristics by making the polycrystalline fluorescent film with the mixing ratio of the second fluorescent crystals lower than the mixing ratio of the first fluorescent crystals.

Further, the present invention can improve the luminescent characteristics by fabricating a transmission type polycrystalline fluorescent film having a relative density of the fluorescent crystals of about 98% to about 99.99% and a pore ratio of about 0.5% to about 2%.

Further, the present invention can improve the luminescent characteristics by fabricating a reflective polycrystalline fluorescent film having a relative density of fluorescent crystals of about 90% to about 96% and a ratio of pores of about 3% to about 10%.

Further, in the present invention, the position of the micro-sized second fluorescent crystal is determined at the time of molding and production, and a polycrystalline fluorescent film is produced, whereby the surface reflection characteristic can be controlled.

Further, the present invention can improve the luminescent characteristics by fabricating a transmission type polycrystalline fluorescent film having a relative density of the fluorescent crystals of about 98% to about 99.99% and a pore ratio of about 0.5% to about 2%.

Further, the present invention can improve the luminescent characteristics by fabricating a reflective polycrystalline fluorescent film having a relative density of fluorescent crystals of about 90% to about 96% and a ratio of pores of about 3% to about 10%.

Further, the present invention can control the surface reflection characteristic by manufacturing a reflection type polycrystalline fluorescent film including a first fluorescent crystal made of a luminescent fluorescent material and a second fluorescent crystal made of a non-luminescent fluorescent material.

The present invention also provides a head lamp light source having reduced yellow ring phenomenon by manufacturing a polycrystalline fluorescent film capable of emitting white light having a color temperature of about 5500K to about 6500K when blue light is incident Can be applied.

In addition, the present invention can improve the luminous flux and broaden the range of the emission wavelength by mixing the nano-sized oxide and the micro-sized fluorescent crystal in a certain ratio to fabricate the polycrystalline fluorescent film, and the nano- It is possible to manufacture a low-cost polycrystalline fluorescent film.

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.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of illustration, It can be seen that various modifications and applications are possible. For example, each component specifically shown in the embodiments can be modified and implemented. It is to be understood that all changes and modifications that come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein.

100: Polycrystalline fluorescent film
10: First fluorescent crystal
20: Second fluorescent crystal
30: Fluorescent powder
40: Mold
50: sintered body

Claims (20)

A mixture comprising a nano-sized first phosphor crystal and a micro-sized second fluorescent crystal,
The mixture may contain,
Wherein the mixing ratio of the second fluorescent crystals is lower than the mixing ratio of the first fluorescent crystals. The method according to claim 1, wherein the mixing ratio of the second fluorescent crystals
And 3% to 30% with respect to the mixture. [2] The method of claim 1,
Wherein the thickness of the polycrystalline fluorescent film is 100 nm to 1000 nm. The method according to claim 1,
(A-Ce _x ) ₃ Al ₅ O ₁₂ wherein A is at least any one of yttrium (Y), gadolinium (Gd), lanthanum (La), and ruthenium (Lu) Wherein the polycrystalline fluorescent film is a polycrystalline fluorescent film. The method according to claim 1, wherein the size of the second fluorescent crystal
Wherein the thickness of the polycrystalline fluorescent film is in the range of 6um to 20um. The method according to claim 1,
(A-Ce _x ) ₃ Al ₅ O ₁₂ (wherein A is at least any one of yttrium (Y), gadolinium (Gd), lanthanum (La), and ruthenium (Lu) Wherein the polycrystalline fluorescent film is a polycrystalline fluorescent film. The method according to claim 1, wherein the emission center wavelength range of the first fluorescent substance crystals,
540 nm to 550 nm,
Wherein the emission center wavelength range of the second fluorescent crystal
560 nm to 580 nm. The liquid crystal display device according to claim 1,
Wherein a first sintering process at a first temperature and a second sintering process at a second temperature lower than the first temperature are performed. 9. The method of claim 8, wherein the first temperature of the first sintering process is selected from the group consisting of:
Wherein the polycrystalline fluorescent film is in the range of 1450 to 1800 degrees. The method according to claim 8, wherein the second temperature of the second sintering step is selected from the group consisting of:
Wherein the temperature of the polycrystalline fluorescent film is lower than the first temperature of the first sintering step by 300 to 400 degrees. Preparing a second fluorescent powder comprising nano-sized first fluorescent particles and micro-sized second fluorescent particles;
Injecting the fluorescent powder into a predetermined mold and molding the fluorescent powder into a predetermined shape;
Forming a sintered body by firstly sintering the fluorescent powder having the predetermined shape at a first temperature;
Sintering the first sintered body to a second temperature lower than the first temperature; And,
And forming a polycrystalline fluorescent film by processing the sintered body subjected to the second sintering step. 12. The method according to claim 11, wherein in the step of preparing the fluorescent powder, a mixing ratio of the second fluorescent particles contained in the fluorescent powder,
Wherein a mixing ratio of the first fluorescent particles contained in the fluorescent powder is lower than that of the first fluorescent particles contained in the fluorescent powder. 13. The method according to claim 12, wherein the mixing ratio of the second fluorescent particles
And 3% to 30% with respect to the fluorescent powder. 12. The method according to claim 11, wherein in the step of preparing the fluorescent powder, the size of the first fluorescent particles contained in the fluorescent powder,
Wherein the thickness of the polycrystalline fluorescent film is 100 nm to 1000 nm. 12. The method according to claim 11, wherein, in preparing the fluorescent powder, the first fluorescent particles contained in the fluorescent powder,
(A-Ce _x ) ₃ Al ₅ O ₁₂ wherein A is at least any one of yttrium (Y), gadolinium (Gd), lanthanum (La), and ruthenium (Lu) And a second step of irradiating the phosphor layer with light. 12. The method according to claim 11, wherein, in the step of preparing the fluorescent powder, the size of the second fluorescent particles contained in the fluorescent powder is,
Wherein the thickness of the polycrystalline fluorescent film is in the range of 6 to 20 um. 12. The method according to claim 11, wherein in the step of preparing the fluorescent powder, the second fluorescent particles contained in the fluorescent powder,
(A-Ce _x ) ₃ Al ₅ O ₁₂ (wherein A is at least any one of yttrium (Y), gadolinium (Gd), lanthanum (La), and ruthenium (Lu) And a second step of irradiating the phosphor layer with light. The method according to claim 11, wherein, in the step of firstly sintering the fluorescent powder having the predetermined shape at a first temperature to produce a sintered body,
1450 DEG C to 1800 DEG C. 12. The method according to claim 11, wherein in the second sintering of the sintered first sintered body to a second temperature lower than the first temperature,
Wherein the temperature of the polycrystalline fluorescent film is lower than the first temperature of the first sintering by 300 to 400 degrees. A light source for generating light;
A polycrystalline fluorescent film disposed on the light source;
A reflector for reflecting the light emitted from the light source to change a direction of light; And,
And a lens for refracting the light reflected from the reflector,
In the polycrystalline fluorescent film,
A mixture comprising a nano-sized first phosphor crystal and a micro-sized second fluorescent crystal,
The mixture may contain,
Wherein the mixing ratio of the second fluorescent crystals is lower than the mixing ratio of the first fluorescent crystals.

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