KR102314610B1 - White light emitting package and manufacturing method by the same - Google Patents

Abstract

The present invention discloses a white light-implemented light emitting package and a method for manufacturing the same. A method of manufacturing a white light-implemented light emitting package according to an embodiment of the present invention includes preparing a coating solution by mixing a phosphor and a solvent; and coating the coating solution on the surface of the blue light emitting device to form a coating layer, wherein white light is expressed by the blue light emitting device and the coating layer.

Description

White light realization light emitting package and manufacturing method thereof

The present invention relates to a white light-implemented light emitting package and a method for manufacturing the same.

Compared to incandescent or fluorescent lamps, LED lighting has environmental-friendly advantages such as low power, long lifespan, and mercury-free, and is gaining popularity in the automotive headlamp market.

This can yield energy savings than current lighting previously reached more than 100lm / W unprecedented level and reduce CO ₂ emissions, and can increase the safety of the driver to the maximum due to the extremely fast signal transmission.

As the adoption of next-generation intelligent LED lighting for automobile headlamps expands, the adoption of DRL (Daytime Running Lamp) and RCL (Rear Combination Lamp), which requires a higher technical level, is expected to rapidly spread.

In particular, although the technical difficulty required for automobile headlights is high, it is expected that the LED lighting market will be rapidly formed in the future because of the active introduction of foreign leading automobile parts industries, prototypes and mass production.

In order to successfully apply the LED lighting system to automobiles, it is important to use LED optics and lighting equipment technology suitable for automobile lighting, while maintaining the design characteristics of automobiles and placing LEDs suitable for lighting-related optical standards.

In particular, there is a need for optical lens and reflector design technology, and optical, lighting equipment material and structural design technology to be able to operate in the conditions of the vehicle's external environment (waterproof and flameproof, shock, vibration, etc.).

Korean Patent No. 10-1778936, "Method for manufacturing non-planar white light emitting diode device using yellow phosphor paste composition capable of spin coating and spray coating" Korean Patent Application Laid-Open No. 10-2010-0127759, "LED light engine kernel and kernel manufacturing method"

In an embodiment of the present invention, there is no need to form a separate photoelectric conversion layer by directly coating a coating solution containing a phosphorescent material on the surface of a blue light emitting device, and white light can be realized in a simple way without the need to match the refractive index An object of the present invention is to provide a light emitting package and a method for manufacturing the same.

An embodiment of the present invention is to provide a white light-implemented light emitting package capable of converting blue light expressed in a blue light emitting device into white light through a simple solution process, which is easy to process and can reduce manufacturing time, and a method for manufacturing the same.

An embodiment of the present invention is to provide a white light-implemented light emitting package capable of excellently expressing white light by adjusting the coating layer thickness by controlling the rotation speed during spin coating of the coating solution according to the blue light intensity of the blue light emitting device, and a method for manufacturing the same. .

A method for manufacturing a white light-implemented light emitting package according to the present invention comprises the steps of preparing a coating solution by mixing a phosphor and a solvent; and coating the coating solution on the surface of the blue light emitting device to form a coating layer, wherein white light is expressed by the blue light emitting device and the coating layer.

According to the method of manufacturing a white light-implemented light emitting package according to an embodiment of the present invention, the coating layer is formed using spin coating, and the thickness of the coating layer can be adjusted by controlling the rotation speed (rpm) of the spin coating.

According to the method of manufacturing a white light-implemented light emitting package according to an embodiment of the present invention, the rotation speed may be 1000 rpm to 5000 rpm.

According to the method of manufacturing a white light-implemented light emitting package according to an embodiment of the present invention, the coating layer may be repeatedly formed by spin-coating the coating solution on the surface of the blue light emitting device at different rotational speeds.

According to the method of manufacturing a white light-implemented light emitting package according to an embodiment of the present invention, the phosphor is a yellow phosphor and DCM ((E)-2-(2-(4-(Dimethylamino)styryl)-6- methyl-4H -pyran-4-ylidene) malononitrile) may include at least one of.

According to the method of manufacturing a white light-implemented light emitting package according to an embodiment of the present invention, the forming of the coating layer comprises casting a coating solution containing the DCM on the surface of the blue light emitting device to form a first coating layer. forming; and spin-coating a coating solution containing the yellow phosphor on the first coating layer to form a second coating layer.

According to the method of manufacturing a white light-implemented light emitting package according to an embodiment of the present invention, the phosphor material may be included in an amount of 5 wt% to 20 wt% based on the total weight of the coating solution.

A white light-implemented light emitting package according to the present invention includes a blue light emitting device; and a coating layer formed on the blue light emitting device and including a phosphorescent material, wherein white light is expressed by the blue light emitting device and the coating layer.

According to the white light-implemented light-emitting package according to an embodiment of the present invention, the color coordinates of the white light-implemented light-emitting package may move according to the thickness of the coating layer.

According to the white light-implemented light emitting package according to an embodiment of the present invention, the thickness of the coating layer may be 0.1 μm to 1 μm.

According to an embodiment of the present invention, there is no need to form a separate photoelectric conversion layer by directly coating a coating solution containing a phosphorescent material on the surface of a blue light emitting device, and white light can be realized in a simple way without matching the refractive index. .

According to an embodiment of the present invention, blue light expressed in a blue light emitting device can be converted into white light by a simple solution process, so that the process is easy and the manufacturing time can be shortened.

According to an embodiment of the present invention, by controlling the thickness of the coating layer by controlling the rotation speed during spin coating of the coating solution according to the intensity of blue light of the blue light emitting device, white light can be excellently expressed.

1 is a flowchart illustrating a method of manufacturing a white light-implemented light emitting package according to an embodiment of the present invention.
2 is a cross-sectional view illustrating a specific state of a white light-implemented light emitting package according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings and the contents described in the accompanying drawings, but the present invention is not limited or limited by the embodiments.

The terminology used herein is for the purpose of describing the embodiments and is not intended to limit the present invention. As used herein, the singular also includes the plural unless specifically stated otherwise in the phrase. As used herein, "comprises" and/or "comprising" does not exclude the presence or addition of one or more other elements, steps, or steps mentioned.

As used herein, “embodiment”, “example”, “aspect”, “exemplary”, etc. are to be construed as advantageous in which any aspect or design described is preferred or advantageous over other aspects or designs. it is not doing

Also, the term 'or' means 'inclusive or' rather than 'exclusive or'. That is, unless stated otherwise or clear from context, the expression 'x employs a or b' means any one of natural inclusive permutations.

Also, as used herein and in the claims, the singular expression "a" or "an" generally means "one or more" unless stated otherwise or clear from the context that it relates to the singular form. should be interpreted as

The terms used in the description below are selected as general and universal in the related technical field, but there may be other terms depending on the development and/or change of technology, customs, preferences of technicians, and the like. Therefore, the terms used in the description below should not be understood as limiting the technical idea, but should be understood as exemplary terms for describing the embodiments.

In addition, in a specific case, there is a term arbitrarily selected by the applicant, and in this case, the meaning will be described in detail in the corresponding description. Therefore, the terms used in the description below should be understood based on the meaning of the term and the content throughout the specification, not the simple name of the term.

Unless otherwise defined, all terms (including technical and scientific terms) used herein may be used with the meaning commonly understood by those of ordinary skill in the art to which the present invention belongs. In addition, terms defined in a commonly used dictionary are not to be interpreted ideally or excessively unless clearly defined in particular.

Meanwhile, in the description of the present invention, if it is determined that a detailed description of a related known function or configuration may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted. And, the terms (terminology) used in this specification are terms used to properly express the embodiment of the present invention, which may vary according to the intention of the user or operator, or customs in the field to which the present invention belongs. Accordingly, definitions of these terms should be made based on the content throughout this specification.

1 is a flowchart illustrating a method of manufacturing a white light-implemented light emitting package according to an embodiment of the present invention.

Referring to FIG. 1 , the method of manufacturing a white light-implemented light emitting package according to an embodiment of the present invention includes preparing a coating solution by mixing a phosphorescent material and a solvent ( S110 ) and coating the coating solution on the surface of a blue light emitting device. to form a coating layer (S120).

In the white light-implemented light emitting package manufactured therefrom, white light is expressed by the blue light emitting device and the coating layer.

Specifically, in the white light-implemented light emitting package, a light emitting device emitting blue light may overlap a color expressed by a phosphor included in the coating layer to emit white light.

The method for manufacturing a white light-implemented light emitting package according to an embodiment of the present invention may be applied to a vehicle headlamp, and any other product equipped with a blue light emitting device may be applied.

In step S110, a coating solution expressing a specific color may be prepared by mixing a phosphor and a solvent.

The phosphor includes a transition metal and emits light after absorbing energy when light energy is applied, and may include a light emitting material and a fluorescent material.

For example, the phosphor may be selected from among yellow phosphor and DCM ((E)-2-(2-(4-(Dimethylamino)styryl)-6-methyl-4H-pyran-4-ylidene)malononitrile). It may include at least one, and as long as it is a material that emits yellow light in order to overlap with blue light emitted from the blue light emitting device to express white light, the type is not limited thereto.

When the phosphorescent material is a yellow phosphor, the coating solution may express yellow color.

Accordingly, in the light emitting package implementing white light, blue light expressed from the blue light emitting device and yellow light expressed from the yellow phosphor included in the coating layer may be mixed to produce white light.

The solvent may dissolve the phosphorescent material, and may include, for example, toluene.

In this case, the phosphor may be included in an amount of 5 wt% to 20 wt% based on the total weight of the coating solution.

When the phosphorescent material is included in an amount of less than 5% by weight, it may not sufficiently overlap the blue color expressed in the blue light emitting device, so that it may be difficult to express white light in a white light-implementing light emitting package.

When the phosphorescent material is included in an amount exceeding 20% by weight, a problem may occur in that the viscosity is increased and the coating property is deteriorated.

In step S120, a coating layer may be formed by directly coating the coating solution including the phosphorescent material on the surface of the blue light emitting device.

In this case, the blue light emitting device may be an LED or OLED that emits blue light.

The coating layer may be formed in the form of a coating film, not in the form of a film.

The coating layer is formed on the surface of the blue light emitting device, and the blue color expressed by the blue light emitting device overlaps the color expressed by the coating layer to convert the color into white light, and performs the same role as a conventional photoelectric conversion layer. can do.

In the conventional white light implementation method, a photoelectric conversion layer is separately formed on the blue light emitting device, and an air layer is formed between the surface of the blue light emitting device and the photoelectric conversion layer, or an adhesive layer for adhesion between the blue light emitting device and the photoelectric conversion layer is included. , a separate refractive index matching was required to realize white light.

However, in the method of manufacturing a white light-implemented light emitting package of the present invention, the coating layer performs the same role as the photoelectric conversion layer, so that white light can be realized by directly coating the coating solution on the surface of the blue light emitting device without separate refractive index matching.

Specifically, in step S120, the coating solution may be spin-coated on the surface of the blue light emitting device to form a coating layer, and the thickness of the coating layer may be adjusted by controlling the rotation speed (rpm) of the spin coating.

More specifically, as the rotation speed of the spin coating increases, the thickness of the coating layer may become thinner, and as the rotation speed of the spin coating decreases, the thickness of the coating layer may become thicker.

According to an embodiment, in the step S120, the thickness of the coating layer may be adjusted by adjusting the rotation speed during the spin coating process according to the intensity of blue light emitted from the blue light emitting device.

In the spin coating process, the rotation speed may be 1000 rpm to 5000 rpm.

When the rotation speed is less than 1000 rpm, the thickness of the coating layer is excessively thick, so that blue light expressed from the blue light emitting device may not pass through the coating layer.

When the rotation speed exceeds 5000 rpm, the thickness of the coating layer is excessively thin, so that it may be difficult to express white light by yellow light expressed in the coating layer and blue light expressed in the blue light emitting device.

According to an embodiment, the coating layer may be formed by repeatedly stacking the coating solution on the surface of the blue light emitting device by spin-coating at different rotation speeds.

For example, the coating layer may be repeatedly formed by spin coating the coating solution on the surface of the blue light emitting device at a rotation speed of 1000 rpm and then spin coating at a rotation speed of 3000 rpm.

In some embodiments, the coating layer may include different phosphorescent materials, and may be formed by repeatedly stacking coating solutions each including different phosphorescent materials.

Specifically, in step S120, a coating solution containing the DCM is cast on the surface of the blue light emitting device to form a first coating layer, and a coating solution containing the yellow phosphor on the first coating layer It may include spin coating to form a second coating layer.

The first coating layer includes DCM, DCM has a longer wavelength than the yellow phosphor, and the coating solution including DCM may be applied on the surface of the blue light emitting device through a casting method.

In some embodiments, the first coating layer may be formed through a spin coating method.

The method of manufacturing a white light-implemented light emitting package according to an embodiment of the present invention can convert blue light expressed in a blue light emitting device into white light with a simple solution process, thereby facilitating the process and shortening the manufacturing time.

In addition, in the method of manufacturing a light emitting package for realizing white light according to an embodiment of the present invention, a coating solution containing a phosphorescent material is directly coated on the surface of a blue light emitting device to form a separate photoelectric conversion layer, and there is no need to match the refractive index. It can convert light into white light.

In addition, in the method of manufacturing a white light-implemented light emitting package according to an embodiment of the present invention, the thickness of the coating layer is adjusted according to the rotation speed of spin coating, and a coating layer of an appropriate thickness is formed according to the blue light intensity of the blue light emitting device to express white light. can do.

Hereinafter, a white light-implemented light-emitting package manufactured by a method of manufacturing a white light-implemented light-emitting package according to an embodiment of the present invention will be described with reference to FIG. 2 .

Since the white light-implemented light-emitting package according to the embodiment of the present invention includes the components of the above-described method for manufacturing the white light-implemented light-emitting package, a redundant description will be omitted.

2 is a cross-sectional view illustrating a specific state of a white light-implemented light emitting package according to an embodiment of the present invention.

Referring to FIG. 2 , the light emitting package 100 for realizing white light according to an embodiment of the present invention includes a blue light emitting device 110 and a coating layer 120 .

The blue light emitting device 110 is a light emitting device emitting blue light, and may be, for example, an LED or OLED emitting blue light.

The coating layer 120 is formed on the blue light emitting device 110, and FIG. 2 shows that it is formed in the form of a film on the surface of the blue light emitting device 110 for convenience, but it may be formed in the form of a coating film instead of in the form of a film. .

The coating layer 120 may include a phosphorescent material, and overlap with blue light emitted from the blue light emitting device 110 to emit yellow light to express white light.

The phosphor may include at least one of yellow phosphor and DCM, and if it is a material that overlaps with blue light expressed from the blue light emitting device 110 and expresses yellow light to express white light, the type is not limited to

The coating layer 120 emits yellow light by the phosphorescent material, and may overlap blue light emitted from the blue light emitting device 110 to emit white light.

Specifically, the coating layer 120 is the color coordinates of the white light-implemented light emitting package 100 according to the embodiment of the present invention by overlapping the blue light expressed from the blue light emitting device 110 and the yellow light expressed from the coating layer 120 . It can move in the direction of white light.

The color coordinates are coordinates for the chromaticity distribution table of the CIE 1931 color space, and the yellow light of the coating layer 120 overlaps the blue light of the blue light emitting device 110 to realize white light according to the embodiment of the present invention. The color coordinates of can be shifted toward white light.

In this case, the color coordinates of the white light-implemented light emitting package 100 according to the embodiment of the present invention may be shifted according to the thickness of the coating layer 120 .

Specifically, as the thickness of the coating layer 120 increases, the color coordinates of the white light-implemented light emitting package 100 according to the embodiment of the present invention may be shifted in the white light direction.

Accordingly, the thickness of the coating layer 120 may be 0.1 μm to 1 μm.

If the thickness of the coating layer 120 is less than 0.1 μm, the thickness of the coating layer 120 is excessively thick, so that the blue light expressed from the blue light emitting device 110 does not pass through the coating layer 120 , and this results in a white light realization light emitting package White light expression of (100) may be difficult.

When the thickness of the coating layer 120 exceeds 1 μm, the thickness of the coating layer 120 is excessively thin and the intensity of yellow light expressed in the coating layer 120 is weak, so that the blue light emitted from the blue light emitting device 110 overlaps due to overlap. White light expression may be difficult.

In the light emitting package 100 for realizing white light according to an embodiment of the present invention, the coating layer 120 is directly formed on the surface of the blue light emitting device 110 without including a separate photoelectric conversion layer, so that White light may be realized due to mixing of blue light and yellow light of the coating layer 120 .

In addition, the light emitting package 100 for realizing white light according to an embodiment of the present invention forms the coating layer 120 of an appropriate thickness according to the blue light intensity of the blue light emitting device 110 , and realizes white light according to the thickness of the coating layer 120 . The color coordinates of the light emitting package 100 may be moved to realize white light.

Hereinafter, the color coordinates of the white light-implementing light-emitting package were evaluated by using the OLED IVL (Current-Voltage-Luminance) measuring equipment of McScience after manufacturing the white light-implementing light-emitting package according to Examples and Comparative Examples.

[Example 1]

After preparing a coating solution by dissolving 0.05 g of a yellow phosphor in 1 mL of toluene, a solvent, the coating solution was spin-coated on the surface of the blue OLED at a speed of 5000 rpm to form a coating layer, thereby preparing a white light emitting package.

[Example 2]

A white light emitting package was prepared in the same manner as in [Example 1], except that the coating solution was spin-coated at 3000 rpm to form a coating layer.

[Example 3]

A white light emitting package was prepared in the same manner as in [Example 1], except that the coating solution was spin-coated at 1000 rpm to form a coating layer.

[Example 4]

A white light emitting package was prepared in the same manner as in [Example 1], except that the coating solution was spin-coated at 1000 rpm and then spin-coated at 3000 rpm to repeatedly form the coating layer.

[Example 5]

After dissolving 0.05 g of DCM in 1 mL of toluene, a solvent, to prepare a coating solution, the coating solution was cast on the surface of a blue OLED to form a coating layer, thereby preparing a white light emitting package.

[Example 6]

A first coating solution was prepared by dissolving 0.01 g of DCM in 15 mL of toluene, a solvent, and 0.05 g of a yellow phosphor was dissolved in 1 mL of toluene to prepare a second coating solution.

After forming the first coating layer by casting the first coating solution on the surface of the blue OLED, the second coating solution was spin-coated on the first coating layer at 1000 rpm to form the second coating layer, thereby preparing a white light emitting package.

[Comparative example]

Blue OLED.

In order to check whether the white light is expressed in Examples 1 to 6 and Comparative Examples, the color coordinates for Examples 1 to 6 and Comparative Examples are (x,y)=(0.333?? ,0.333??) direction was evaluated and summarized in the table below.

[graph]

Referring to the above table, it can be seen that the color coordinates of Examples 1 to 6 including the phosphorescent material are shifted to white rather than the color coordinates of Comparative Examples.

In addition, in Examples 1 to 3, it can be seen that the color coordinates are shifted to white as the rotation speed decreases during spin coating.

Accordingly, it can be seen that as the rotational speed of the coating solution decreases, the thickness of the coating layer becomes thicker and the color coordinates of the light expressed in the white light-implemented light emitting package are shifted to white.

In addition, according to Example 4, when the coating layer is formed by spin coating at different rotational speeds, it can be confirmed that the color coordinates are further shifted to white.

In addition, it can be seen that the color coordinates are shifted to white even in the case of Example 5 in which only DCM is cast, and accordingly, DCM is also a phosphorescent material and it can be seen that blue light expressed in a blue light emitting device can be converted into white light. can

In addition, in the case of Example 6 using both DCM and yellow phosphor, it can be seen that the color coordinates are shifted toward the whitest side.

Accordingly, in the method of manufacturing a light emitting package implementing white light according to an embodiment of the present invention, blue light expressed in the blue light emitting device can be excellently converted into white light by coating directly on the surface of the blue light emitting device using a phosphorescent material. .

As described above, although the present invention has been described with reference to limited embodiments and drawings, the present invention is not limited to the above embodiments, and various modifications and variations from these descriptions are provided by those skilled in the art to which the present invention pertains. This is possible. Therefore, the scope of the present invention should not be limited to the described embodiments, but should be defined by the following claims as well as the claims and equivalents.

100: white light realization light emitting package
110: blue light emitting device
120: coating layer

Claims (10)

preparing a coating solution by mixing a phosphor and a solvent; and
and coating the coating solution on the surface of the blue light emitting device to form a coating layer,
It is characterized in that white light is expressed by the blue light emitting device and the coating layer,
The phosphor is at least one of a yellow phosphor and DCM ((E)-2-(2-(4-(Dimethylamino)styryl)-6-methyl-4H-pyran-4-ylidene)malononitrile) includes,
The forming of the coating layer may include forming a first coating layer by casting a coating solution containing the DCM on the surface of the blue light emitting device, and a coating comprising the yellow phosphor on the first coating layer Method of manufacturing a white light-implemented light emitting package, characterized in that it further comprises the step of forming a second coating layer by spin coating the solution.

According to claim 1,
The coating layer is formed using spin coating,
A method of manufacturing a white light-implemented light emitting package, characterized in that the thickness of the coating layer is adjusted by controlling the rotation speed (rpm) of the spin coating.
3. The method of claim 2,
The rotation speed is a method of manufacturing a white light-implemented light emitting package, characterized in that 1000rpm to 5000rpm.
3. The method of claim 2,
The coating layer is a method of manufacturing a white light-implemented light emitting package, characterized in that the coating solution is spin-coated at different rotation speeds on the surface of the blue light emitting device to be repeatedly formed.
delete delete According to claim 1,
The phosphorescent material is a method of manufacturing a white light-implemented light emitting package, characterized in that it is included in an amount of 5% to 20% by weight based on the total weight of the coating solution.
blue light emitting device; and
A coating layer formed on the blue light emitting device and including a phosphorescent material
includes,
White light realization light emitting package, characterized in that the white light is expressed by the blue light emitting device and the coating layer.
9. The method of claim 8,
A white light-implemented light-emitting package, characterized in that the color coordinates of the white light-implemented light-emitting package move according to the thickness of the coating layer.
9. The method of claim 8,
The coating layer has a thickness of 0.1 μm to 1 μm.

Images