KR20190106392A - Light emitting device package - Google Patents

Abstract

The present invention relates to a light emitting device package and, more specifically, to a light emitting device package which can reduce scattering due to fine particles such as fog, dust, or the like. To this end, according to an embodiment of the present invention, the light emitting device package comprises: a light source emitting blue light; a fluorescent substance; and an encapsulant arranged to surround the light source. In an emitted spectrum, based on a standard in which light emission intensity in a 430 to 470 nm wavelength range region is 100%, the light emitting intensity in a 530 to 700 nm wavelength range region is 240 to 270%.

Description

Light emitting device package {LIGHT EMITTING DEVICE PACKAGE}

The present invention relates to a light emitting device package. More particularly, the present invention relates to a light emitting device package capable of minimizing scattering caused by fine particles such as fog and dust.

A light emitting diode (LED) is a compound semiconductor device that converts electrical energy into light energy, and various colors can be realized by adjusting the composition ratio of the compound semiconductor.

In addition, LEDs consume significantly less power than conventional light sources such as fluorescent and incandescent lamps, and have semi-permanent lifespan, fast response speed, stability, and environment-friendly advantages. It's replacing with speed.

In general, islands, mountainous areas or areas where fog frequently occurs, people are less aware of the white light source due to the scattering of fine particles, and for this reason, safety accidents such as traffic accidents increase. This is because, due to Rayleigh Scattering, light is scattered by fine particles such as smoke or fog before reaching the ground and cannot penetrate. Rayleigh scattering is about 9 times better at shorter wavelengths (about 400 nm) than longer wavelengths (about 700 nm). That is, light has a shorter wavelength, a higher frequency, and a higher energy means better scattering. Accordingly, it is desirable to install lighting to minimize scattering and to transmit light to islands and road lights used in mountain areas.

The lights used in the prior art mainly used a cool white light with a color temperature of 5000-6500K and a warm white light with a color temperature of 2700-3000K. These lights are well scattered due to the above-mentioned reasons, and in particular, in the case of cool white lighting, scattering is more severe and it is difficult to function as lighting.

Accordingly, there is a need to develop a light emitting device package that can minimize scattering and increase transmittance and install the light emitting device package in islands, mountains, and fog areas.

(Patent Document 0001) Republic of Korea Patent Publication No. 10-2016-0113861

The technical problem to be solved by the present invention is to provide a light emitting device package that can minimize the scattering by fine particles such as fog or dust, and improve the transmittance.

The technical problems of the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those skilled in the art from the following description.

The object is a light source for emitting blue light; And an encapsulant including a phosphor and disposed to surround the light source, wherein the emitted spectrum is based on 100% of the emission intensity in the 430-470 nm wavelength range, and the emission intensity in the 530-700 nm wavelength range is It can be achieved by the light emitting device package is 240 ~ 270%.

In this case, the light source may emit blue light in a wavelength range of 440 to 460 nm.

The phosphor may include a first phosphor having a emission center wavelength of 525 nm to 550 nm; A second phosphor having a light emission center wavelength of 550 nm to 570 nm; And a third phosphor having a emission center wavelength of 640 to 665 nm.

Preferably, the first phosphor may include at least one of a phosphor represented by Formula 1 and a phosphor represented by Formula 2 below.

[Formula 1]

Si _6-z Al _z O _z N _8-z : Eu ²⁺ _x

(In Formula 1, 0.01≤x≤0.10, 0.01≤z≤0.3)

[Formula 2]

(Sr, Ba) _3-x Si ₆ O ₃ N ₈ : Eu ²⁺ _x

(In Formula 2, 0.01≤x≤0.3)

Preferably, the second phosphor may include a phosphor represented by the following formula (3).

[Formula 3]

LiBa _2-x Si ₅ N ₈ : Eu ²⁺ _x

(In Formula 3, 0.01≤x≤0.3)

Preferably, the third phosphor may include at least one of a SCASN series phosphor represented by the following Formula 4 and an SSN series phosphor represented by the following Formula 5.

[Formula 4]

(Ca, Sr) _1-x AlSiN ₃ : Eu ²⁺ _x

(In formula 4, 0 <x ≦ 0.50)

[Formula 5]

Sr _2-x Si ₅ N ₈ : Eu ²⁺ _x

(In Formula 5, 0 <x ≦ 0.50)

In addition, the phosphor may include 5 to 15 wt% of the first phosphor, 70 to 85 wt% of the second phosphor, and 5 to 20 wt% of the third phosphor with respect to 100 wt% of the entire phosphor.

In addition, the phosphor may be included in 25 to 35 parts by weight based on 100 parts by weight of the encapsulant.

According to the present invention as described above, it is possible to minimize the scattering by the fine particles, such as fog or dust particles by strengthening the Amber peak (Amber peak) area, and have an effect of increasing the transmittance.

Furthermore, it can also have an effect that can be applied to a variety of special lighting, such as general Middle power LED, High Power LED, Camera Flash, car LED, medical LED.

Effects of the present invention are not limited to the above-mentioned effects, and other effects not mentioned will be clearly understood by those skilled in the art from the following description.

1 is a reference diagram for Rayleigh scattering.
2 is a schematic cross-sectional view of a light emitting device package according to an embodiment of the present invention.
Figure 3 shows the spectrum (amber spectrum) of the light emitting device package according to an embodiment of the present invention.
4 to 5 show the spectra of the comparative examples.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Advantages and features of the present invention and methods for achieving them will be apparent with reference to the embodiments described below in detail with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below, but can be implemented in various forms, and only the embodiments are intended to complete the disclosure of the present invention, and the general knowledge in the art to which the present invention pertains. It is provided to fully convey the scope of the invention to those skilled in the art, and the present invention is defined only by the scope of the claims. Like reference numerals refer to like elements throughout.

Unless otherwise defined, all terms (including technical and scientific terms) used in the present specification may be used in a sense that can be commonly understood by those skilled in the art. In addition, the terms defined in the commonly used dictionaries are not ideally or excessively interpreted unless they are specifically defined clearly. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. In this specification, the singular also includes the plural unless specifically stated otherwise in the phrase.

As used herein, “comprises” and / or “comprising” refers to a component, step, operation and / or element that is mentioned in the presence of one or more other components, steps, operations and / or elements. Or does not exclude additions.

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

2 is a cross-sectional view of a light emitting device package 100 according to an embodiment of the present invention. Referring to Figure 2, the light emitting device package 100 according to an embodiment of the present invention includes a light source 10 for emitting blue light; And an encapsulant 20 including the phosphor 21 and disposed to surround the light source 10, wherein the emitted spectrum is based on 100% of an emission intensity in a wavelength range of 430 to 470 nm. The light emission intensity in the 700 nm wavelength range region is characterized in that 240 ~ 270%. The present invention enhances the emission intensity of the amber region (530 ~ 700nm wavelength range) compared to the blue region (430 ~ 470nm wavelength range region) than the conventional light emitting device package used for road lighting in the mountains, islands, dust, fog, etc. Minimizing scattering by the fine particles, and can increase the transmittance, it can have the effect of improving the cognition of the human eye by applying to various lighting fixtures, such as road lighting.

The light source 10 emitting blue light is located on the body 30. The light source 10 preferably uses a light source 10 that emits blue light in a wavelength range of 440 nm to 460 nm in order to reinforce the amber region by the combination with the phosphor 21 to be described later. The body 30 may use the body 30 in which the cavity is formed. The cavity may be formed in a cup shape, a concave container shape, or the like, and the side surface of the cavity may be formed perpendicularly or inclined with respect to the bottom surface, and may vary in size and shape. The shape of the cavity viewed from above may be circular, polygonal, oval, or the like, or may be a curved shape. However, the present invention is not limited thereto, and a body 30 having various shapes may be used.

The encapsulant 20 includes the phosphor 21 and is disposed surrounding the light source 10. The encapsulant 20 may be formed by dotting the body 30 on which the light source 10 is formed. The encapsulant 20 may use a thermosetting resin such as an epoxy resin or a silicone resin, or may use a ceramic material such as glass. The light emitting device package 100 may be manufactured in various forms such as a horizontal type, a vertical type, a flip type, and the phosphor 21 may be included in an amount of 20 to 150 parts by weight based on 100 parts by weight of the encapsulant 20. Preferably, the light emitting device package 100 may be manufactured in a lead frame type. In this case, the phosphor 21 may be included in an amount of 25 to 35 parts by weight based on 100 parts by weight of the encapsulant 20.

The phosphor 21 included in the encapsulant 20 includes a first phosphor 21a having a light emission center wavelength of 525 nm to 550 nm; A second phosphor 21b having a luminescence center wavelength of 550 nm to 570 nm; And a third phosphor 21c having a emission center wavelength of 640 nm to 665 nm.

The first phosphor 21a may be a phosphor that is excited by an excitation light source and emits light in a green region or emits light in a yellow region. That is, it may be a green phosphor (green phosphor) and / or a yellow phosphor (yellow phosphor). Specifically, the first phosphor 21a may include at least one of a phosphor represented by the following Chemical Formula 1 and a phosphor represented by the following Chemical Formula 2.

[Formula 1]

Si _6-z Al _z O _z N _8-z : Eu ²⁺ _x

(In Formula 1, 0.01≤x≤0.10, 0.01≤z≤0.3)

[Formula 2]

(Sr, Ba) _3-x Si ₆ O ₃ N ₈ : Eu ²⁺ _x

(In Formula 2, 0.01≤x≤0.3)

The second phosphor 21b may be a phosphor that is excited by an excitation light source and emits light in an amber region. That is, it may be an amber phosphor (amber phosphor). Specifically, the second phosphor 21b may include a phosphor represented by Chemical Formula 3 below.

[Formula 3]

LiBa _2-x Si ₅ N ₈ : Eu ²⁺ _x

(In Formula 3, 0.01≤x≤0.3)

The third phosphor 21c may be a phosphor that is excited by an excitation light source and emits light in a red region. That is, it may be a red phosphor (red phosphor). Specifically, the third phosphor 21c may include at least one of the SCASN series phosphor represented by the following Chemical Formula 4 and the SSN series phosphor represented by the following Chemical Formula 5.

[Formula 4]

(Ca, Sr) _1-x AlSiN ₃ : Eu ²⁺ _x

(In formula 4, 0 <x ≦ 0.50)

[Formula 5]

Sr _2-x Si ₅ N ₈ : Eu ²⁺ _x

(In Formula 5, 0 <x ≦ 0.50)

In the case of using the light source 10 emitting blue light, the phosphor 21 is preferably adjusted to an appropriate compounding ratio in order to strengthen the amber region relative to the wavelength of the blue region. To this end, the phosphor 21 is 5 to 15% by weight of the first phosphor 21a, 70 to 85% by weight of the second phosphor 21b and 5 to 20% by weight based on 100% by weight of the total phosphor 21 The third phosphor 21c may be included.

Hereinafter, the configuration and effects of the present invention will be described in more detail with reference to specific examples. However, this embodiment is intended to illustrate the present invention in more detail, and the scope of the present invention is not limited to these examples.

EXAMPLE

A light emitting device package was manufactured by mixing 20 parts by weight of a phosphor with respect to 100 parts by weight of a silicon encapsulating material, and mixing yellow (LYP) (8 wt%), amber (LAP) (78 wt%), and red (SCASN) (14 wt%). .

[Comparative Example]

5000K and 2700K models of 5630 PKG (using blue light source and yellow phosphor) produced by LG Innotek were used as Comparative Examples 1 and 2, respectively.

Experimental Example: Comparison of Spectral Intensity

After measuring the intensity of the spectrum according to the wavelength of Examples and Comparative Examples 1 and 2, the results are shown in Figs. 3 and 4 to 5, respectively. As shown in FIG. 3, in the case of the embodiment, it was found that the emission intensity of the 530-700 nm wavelength range (amber peak) was about 265% based on the emission intensity of 100% of the 430-470 nm wavelength range (blue peak). . Therefore, compared to Comparative Examples 1 and 2, the amber region can be strengthened relative to each other, thereby minimizing scattering of light by fine particles such as dust and fog, and improving the transmittance.

Meanwhile, a plurality of light emitting device packages according to the present invention described above may be arranged on a substrate, and a light guide plate, a prism sheet, a diffusion sheet, or the like, which is an optical member, may be disposed on an optical path of the light emitting device package.

In addition, it can be implemented as a light source device including a light emitting device package according to the present invention.

In addition, the light source device includes a light source module including a substrate and a light emitting device package according to the present invention, a radiator for dissipating heat from the light source module, and a power supply unit for processing or converting an electrical signal provided from the outside and providing the light source module to the light source module. It may include. For example, the light source device may include a lamp, a head lamp, or a street lamp. In addition, the light source device according to the embodiment may be variously applied to a product requiring light to be output.

In addition, the light source device includes a bottom cover, a reflector disposed on the bottom cover, a light emitting module emitting light and including a semiconductor element, a light guide plate disposed in front of the reflector and guiding light emitted from the light emitting module to the front; An optical sheet including prism sheets disposed in front of the light guide plate, a display panel disposed in front of the optical sheet, an image signal output circuit connected to the display panel and supplying an image signal to the display panel, and disposed in front of the display panel It may include a color filter. The bottom cover, the reflector, the light emitting module, the light guide plate, and the optical sheet may form a backlight unit.

As another example of the light source device, the head lamp may include a light emitting module including a light emitting device package disposed on a substrate, a reflector reflecting light emitted from the light emitting module in a predetermined direction, for example, a front, and reflected by the reflector. It may include a lens for refracting the light forward, and a shade for blocking or reflecting a portion of the light reflected by the reflector toward the lens to achieve a light distribution pattern desired by the designer.

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. Therefore, it should be understood that the embodiments described above are exemplary in all respects and not restrictive.

100: light emitting device package
10: light source
20: encapsulant
21: phosphor
21a: first phosphor
21b: second phosphor
21c: third phosphor
30: body

Claims (8)

A light source emitting blue light; And
Including a phosphor, encapsulating material disposed surrounding the light source; including,
The emission spectrum,
Based on 100% emission intensity in the 430-470nm wavelength range,
The light emitting device package, characterized in that the emission intensity in the wavelength range of 530 ~ 700nm is 240 ~ 270%. The method of claim 1, wherein the light source,
A light emitting device package, characterized in that for emitting blue light in the wavelength range of 440 ~ 460nm. The method of claim 1, wherein the phosphor,
A first phosphor having a light emission center wavelength of 525 to 550 nm;
A second phosphor having a light emission center wavelength of 550 nm to 570 nm; And
And a third phosphor having a light emission center wavelength of 640 nm to 665 nm. The method of claim 3, wherein the first phosphor,
A light emitting device package, characterized in that it comprises at least one of the phosphor represented by the formula (1) and the phosphor represented by the formula (2).
[Formula 1]
Si _6-z Al _z O _z N _8-z : Eu ²⁺ _x
(In Formula 1, 0.01≤x≤0.10, 0.01≤z≤0.3)
[Formula 2]
(Sr, Ba) _3-x Si ₆ O ₃ N ₈ : Eu ²⁺ _x
(In Formula 2, 0.01≤x≤0.3) The method of claim 3, wherein the second phosphor,
To include a phosphor represented by the formula (3), a light emitting device package.
[Formula 3]
LiBa _2-x Si ₅ N ₈ : Eu ²⁺ _x
(In Formula 3, 0.01≤x≤0.3) The method of claim 3, wherein the third phosphor,
A light emitting device package, characterized in that it comprises at least one of the SCASN-based phosphor represented by the formula (4) and the SSN-based phosphor represented by the formula (5).
[Formula 4]
(Ca, Sr) _1-x AlSiN ₃ : Eu ²⁺ _x
(In formula 4, 0 <x ≦ 0.50)
[Formula 5]
Sr _2-x Si ₅ N ₈ : Eu ²⁺ _x
(In Formula 5, 0 <x ≦ 0.50) The method of claim 3, wherein the phosphor,
A light emitting device package comprising: 5 to 15 wt% of a first phosphor, 70 to 85 wt% of a second phosphor, and 5 to 20 wt% of a third phosphor relative to 100 wt% of the total phosphor. The method of claim 1, wherein the phosphor,
The light emitting device package, characterized in that contained in 25 to 35 parts by weight based on 100 parts by weight of the encapsulant.

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