KR20140051475A - Light emitting glass and light emitting device using the same - Google Patents

Light emitting glass and light emitting device using the same Download PDF

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Publication number
KR20140051475A
KR20140051475A KR20120109201A KR20120109201A KR20140051475A KR 20140051475 A KR20140051475 A KR 20140051475A KR 20120109201 A KR20120109201 A KR 20120109201A KR 20120109201 A KR20120109201 A KR 20120109201A KR 20140051475 A KR20140051475 A KR 20140051475A
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South Korea
Prior art keywords
light emitting
light
glass
emitting device
mol
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KR20120109201A
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Korean (ko)
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KR101733495B1 (en
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강동원
유영길
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엘지전자 주식회사
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Abstract

The present invention relates to a light emitting device, and more particularly, to a light emitting glass and a light emitting device using the same. The present invention provides a package comprising: a package body having a mounting portion; A light emitting element mounted on a mounting portion of the package body and emitting light in a first wavelength band; And a light emitting glass which is positioned on the light emitting device and converts the wavelength of at least a part of light emitted from the light emitting device, the light emitting glass being excited by light emitted from the light emitting device to emit light in a second wavelength band, And a color converting unit that is provided in the glass and includes a phosphor that is excited by light emitted from the light emitting device and emits light in a third wavelength band.

Description

TECHNICAL FIELD The present invention relates to a light emitting glass and a light emitting device using the same,

The present invention relates to a light emitting device, and more particularly, to a light emitting glass and a light emitting device using the same.

A light emitting diode (LED), which is one of the light emitting devices, is a light emitting device manufactured using a semiconductor manufacturing process. Since the luminescence phenomenon was observed by applying a voltage to a semiconductor device in the 1920s, it began to be put to practical use at the end of the 1960s.

Since then, researches and developments have been made to improve the efficiency of LED steadily. In particular, there is a growing interest in LEDs having optical characteristics enough to replace conventional light sources. In addition, studies on LED packages and lighting devices using them have been actively conducted along with an increase in research on LEDs.

It is also a point light source and small-sized optical device, and its application fields are very broad in all industries including display, signal, display, lighting, bio, telecommunication, mobile phone, LCD and automobile industry.

When such an LED is used as a light source, a phosphor may be used for color conversion. For example, when a blue light emitting LED is used, white light can be realized by using a yellow phosphor.

Disclosure of Invention Technical Problem [8] The present invention provides a light-emitting glass having a transparent matrix and a light-emitting property.

Also, a light emitting device package capable of providing a high quality light source by using such a light emitting glass together with a phosphor is provided.

According to a first aspect of the present invention, there is provided a light-emitting glass comprising SiO 2 having 30 to 60 mol%, Al 2 O 3 having 0 to 5 mol%, MgO having 10 to 30 mol% , A host having a composition of CaO having 20 to 40 mol%; A glass-forming agent having a composition of 1 to 10 mol%; And a glass composition doped in the matrix to emit light and having an active agent having a composition of 1 to 3 mol%.

According to a second aspect of the present invention, there is provided a package comprising: a package body having a mounting portion; A light emitting element mounted on a mounting portion of the package body and emitting light in a first wavelength band; And a light emitting glass which is positioned on the light emitting device and converts the wavelength of at least a part of light emitted from the light emitting device, the light emitting glass being excited by light emitted from the light emitting device to emit light in a second wavelength band, And a color converting unit that is provided in the glass and includes a phosphor that is excited by light emitted from the light emitting device and emits light in a third wavelength band.

The present invention has the following effects.

First, in the case of implementing illumination using a light-emitting glass capable of emitting red or other intermediate colors, the light-emitting characteristic excellent in color reproduction characteristics can be exhibited without lowering the transmittance or decreasing the color uniformity.

That is, unlike a resin in which a conventional fluorescent material is mixed, the light emitting glass is not discolored due to heat, and high-quality illumination can be realized without lowering the light transmittance of the light emitting element by the phosphor particles.

When such a light emitting glass is used in a light emitting device, the color rendering index (CRI) and the color quality scale (CQS) can be improved without lowering the light extraction efficiency.

1 is a cross-sectional view showing an example of a light emitting device.
2 is an enlarged view of the color conversion section.
3 is a schematic view showing the principle of light emission of the light emitting device.
4 is a graph showing the emission spectrum of the luminescent glass.
5 is a cross-sectional photograph showing a normal color conversion unit.
6 is a cross-sectional photograph showing the light-emitting glass of the present invention.
7 is a graph showing the emission spectrum of a conventional light emitting device.
8 is a graph showing the emission spectrum of the light emitting device of the present invention.
9 is a flowchart showing a manufacturing process of the color conversion unit.
10 is a schematic view showing a state in which a glass frit and a phosphor are mixed.
11 is a schematic view showing a state in which a glass frit and a phosphor are sintered.
12 is a schematic view showing the manufactured light-emitting glass.

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

While the invention is susceptible to various modifications and alternative forms, specific embodiments thereof are shown by way of example in the drawings and will herein be described in detail. Rather, the intention is not to limit the invention to the particular forms disclosed, but rather, the invention includes all modifications, equivalents and substitutions that are consistent with the spirit of the invention as defined by the claims.

It will be appreciated that when an element such as a layer, region or substrate is referred to as being present on another element "on," it may be directly on the other element or there may be an intermediate element in between .

Although the terms first, second, etc. may be used to describe various elements, components, regions, layers and / or regions, such elements, components, regions, layers and / And should not be limited by these terms.

1, an example of a light emitting device includes a package body 10 provided with a mounting portion 11, a mounting portion 11 which is mounted on the mounting portion 11 of the package body 10 and emits light in a first wavelength band A light emitting device 20 and a color conversion unit 30 for converting a wavelength of at least a part of light emitted from the light emitting device 20 on the light emitting device 20. [

The package body 10 of the light emitting device may be made of a material such as a ceramic or a semiconductor and includes a lead (not shown) electrically connected to the light emitting element 20, a heat emitting portion (not shown) And the like.

The mounting portion 11 of the package body 10 may have a groove shape recessed from the upper surface of the package body 10 as shown in Fig. However, it is of course possible to have various shapes such as a flat shape.

In the case of having the groove-shaped mounting portion 11, the mounting portion 11 may be filled with the filling material 40 of a material such as silicone gel or epoxy. However, a protective layer for protecting the light emitting element 20 may be located even when the mounting portion has a flat shape or the like.

Optionally, such filler material 40 may be omitted. Accordingly, the color conversion unit 30 may be disposed on the filler 40, but it may be configured to be in contact with the light emitting device 20, as the case may be.

As described above, the package body 10 having various shapes can be used. Hereinafter, a detailed description of the package body 10 will be omitted.

2, the color converting unit 30 includes a light emitting glass 31 that emits light in a second wavelength band by being excited by light emitted from the light emitting device 20, And a phosphor 32 that emits light in the third wavelength band by being excited by the light emitted from the light emitting device 20.

Here, a light emitting diode (LED) may be used as the light emitting element 20, but various other light emitting elements 20 may be used.

The light emitting glass 31 is in the same state as the transparent glass when it is not excited, but is a light emitting body in which the whole glass emits light when excited by light emitted from the light emitting element 20 or other energy.

When the light emitting glass 31 is used in a light emitting device, the color rendering index (CRI) and the color quality scale (CQS) can be improved without lowering the light extraction efficiency. This will be described in detail below.

FIG. 3 shows the principle of light emission of the light emitting device of the example described above. That is, when the light of the first wavelength band is emitted from the light emitting device 20, the color converting unit 30 is excited by the light of the first wavelength band, and a part of the light of the first wavelength band is excluded from the first wavelength band Into a second wavelength band and a third wavelength band having a long wavelength.

For example, the light emitting glass 31 is excited by the light of the first wavelength band to emit light of the second wavelength band. At this time, the light emitting glass 31, which is transparent, The light of the second wavelength band can be emitted from the entirety of the light emission glass 31.

The phosphor 32 may be excited by the light of the first wavelength band emitted from the light emitting device 20 to emit light of the third wavelength band.

The light of the second wavelength band emitted from the light emitting glass 31 may excite the fluorescent substance 32 or the light of the third wavelength band emitted from the fluorescent substance 32 may be emitted from the light emitting glass 31 ).

For example, if the first wavelength band is the blue band, the second wavelength band is the red band, and the third wavelength band is the yellow band, the blue light emitted from the light emitting device 20 31 emit red light as a whole and the phosphor 32 emits yellow light by the blue light emitted from the light emitting element 20. [

FIG. 4 shows the emission spectrum of the light-emitting glass 31 that emits light in the red wavelength band. As can be seen from the luminescence spectrum, it can be seen that it exhibits excellent luminescence characteristics in the red region.

When the blue light is emitted from the light emitting element 20, a part of the blue light is emitted by the phosphor 32 included in the light converting part 30, and the blue light and the yellow light are mixed, Light is emitted.

However, in order to realize high-quality illumination, it is necessary to improve color reproduction characteristics such as color rendering index (CRI) and color quality scale (CQS) described above.

In this case, red or neutral light emission is required, and the light emitting device of the present invention can improve such color reproduction characteristics by the red light emitted from the light emitting glass 31.

On the other hand, as a conventional method, when a variety of phosphors are mixed in a resin to improve color reproduction characteristics, such a phosphor may be incorporated in a resin and used in a light emitting device. Such degradation and discoloration of the resin may occur, The lowering of the temperature dependency of the temperature may cause a problem of lowering the efficiency.

Also, if the content of the phosphor is increased, the efficiency of the light emitting device as a whole may be lowered due to a decrease in light transmittance, or the color uniformity may be lowered.

However, in the case of implementing illumination using the light-emitting glass 31 capable of emitting red or other intermediate colors as described above, there is no such problem, that is, when the color reproduction is performed without lowering the transmittance or decreasing the color uniformity The luminescent characteristics excellent in characteristics can be exhibited.

Furthermore, the light emitting glass 31 is not discolored by heat, and the color converting unit 30 is formed by mixing and sintering the light emitting glass 31 and the phosphor 32 to realize high-quality illumination.

Fig. 5 shows a cross section of a state in which a red phosphor is contained in a resin or glass as a conventional method. As shown in the figure, it can be observed that a red phosphor is mixed in the glass. The phosphor thus observed can lower the light transmittance of the light emitting element.

However, FIG. 6 shows the light-emitting glass 31 capable of emitting red light, and particles like the fluorescent material are not observed, and a smooth glass-like structure can be confirmed. Such a light-emitting glass 31 has an appearance similar to that of a transparent glass when it is not excited, and when it is excited, the light is uniformly emitted as a whole.

7 shows the spectrum of white light when a usual red phosphor is used for improving the color rendering property, and Fig. 8 shows the spectrum of white light when the emission glass 31 is used.

As shown in the figure, the color rendering index can be improved up to 94 in the case of using the light emitting glass 31 described above while the color rendering index is 62 in the case of using a usual method using a common red phosphor.

As described above, such a light-emitting glass 31 is made of a glass composition having light-emitting characteristics, and when it is not excited, it is possible to provide a glass-like transparent light-emitting body.

Such a glass composition may comprise a host material, a glass former for vitrification, and an activator doped in the matrix to emit energy to emit light.

In order to vitrify the glass composition, a very high temperature is required. Thus, the glass composition may not be vitrified when synthesized at such a high temperature and may be a crystalline material, and thus may contain a glass forming agent for vitrification.

In addition, the glass composition may further include a glass modifier which serves as a non-crosslinked corpuscle in the glass composition and lower the vitrification temperature to help vitrification.

The composition of the matrix material may include SiO 2 having 30 to 60 mol%, Al 2 O 3 having 0 to 5 mol%, MgO having 10 to 30 mol%, and CaO having 20 to 40 mol% .

The glass former forming this mother material into glass may have a composition of 1 to 10 mol%, and B 2 O 3 may be used.

On the other hand, ZnO having a composition of 0 to 10 mol% can be used as the free-form modifier.

As the activator, Eu oxide having a composition of 1 to 3 mol% may be used for red emission. Such Eu oxide may be Eu 2 O 3 .

On the other hand, it is also possible to manufacture the light-emitting glass 31 that emits light of a different wavelength band by changing the activator. For example, the light emitting glass 31 that emits green light can be formed using Tb oxide, and the light emitting glass 31 that emits yellow light using Ce oxide can be formed.

The Tb oxide may use Tb 4 O 7 , and the Ce oxide may use CeO 2 . In addition, the Mn material may be used as an activator. As described above, light emission of a desired wavelength band can be obtained through the modification of the activator. It is also possible to control the intensity of luminescence emission by changing the content of the activator.

Hereinafter, a manufacturing process of the color conversion portion 30 including the light emitting glass 31 will be described with reference to FIGS. 9 to 12. FIG.

9 is a flowchart showing a manufacturing process of the color conversion unit 30. The manufacturing process of the color conversion unit 30 includes a manufacturing step S10 of glass frit for the light emitting glass 31, And mixing and sintering the glass frit with the phosphor (S20).

In order to prepare glass frit, the raw materials of the glass composition are first mixed (S11) and melted at a high temperature (S12) is performed together.

The raw material of the glass composition may contain a matrix, a glass former and an activator as described above, and a glass modifier may further be contained therein.

Here, the activator can be selected according to the emission wavelength, and the content thereof can be determined according to the emission intensity.

The light emitting glass material in which the raw material is vitrified is made into a state of flake (S13), and the glass frit is produced by pulverizing it (S14).

Thereafter, as shown in Fig. 10, such a glass frit and a phosphor are mixed (S21). The phosphor may be selected to emit light of a desired wavelength band. For example, a yellow phosphor capable of emitting white light in combination with blue light can be used. However, it goes without saying that a phosphor capable of emitting light in other wavelength bands can be selected.

For example, the glass composition contains an activator capable of emitting yellow wavelength light, and the red phosphor may be mixed therein. In addition, two or more kinds of phosphors emitting light of different wavelength bands may be mixed.

As shown in FIG. 11, the glass frit thus mixed with the phosphor is sintered together (S22).

Then, as shown in FIG. 12, the color converting unit 30 in which the phosphors 32 are located is formed in the light emitting glass 31.

1, the light emitting device 20 is mounted on the mounting portion 11 of the package body 10, and the mounting portion 11 is filled with the filling material 40, The light emitting device can be manufactured by attaching the color conversion portion 30.

It should be noted that the embodiments of the present invention disclosed in the present specification and drawings are only illustrative of specific examples for the purpose of understanding and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that other modifications based on the technical idea of the present invention are possible in addition to the embodiments disclosed herein.

10: package body 11: mounting part
20: light emitting element 30:
31: luminous glass 32: fluorescent material
40: filler

Claims (13)

In the light-emitting glass,
A matrix having a composition of SiO 2 having 30 to 60 mol%, Al 2 O 3 having 0 to 5 mol%, MgO having 10 to 30 mol%, and CaO having 20 to 40 mol%;
A glass-forming agent having a composition of 1 to 10 mol%; And
And a glass composition doped in the matrix to emit light and containing an activator having a composition of 1 to 3 mol%. The light-emitting glass according to claim 1, wherein the glass forming agent comprises B 2 O 3 . The light-emitting glass according to claim 1, further comprising a glass modifier having a composition of 0 to 10 mol% as a non-crosslinking oxygen in the glass composition. The light-emitting glass according to claim 3, wherein the glass modifier is ZnO. The light-emitting glass according to claim 1, wherein the activator is at least one of a Eu oxide, a Tb oxide, and a Ce oxide. A package body having a mounting portion;
A light emitting element mounted on a mounting portion of the package body and emitting light in a first wavelength band; And
A light emitting glass which is positioned on the light emitting device and converts at least a part of the wavelength of the light emitted from the light emitting device to emit light of a second wavelength band by being excited by light emitted from the light emitting device, And a color converting part including a phosphor that is provided in the light emitting device and emits light in a third wavelength band by being excited by light emitted from the light emitting device. The light emitting device according to claim 6, wherein the first wavelength band is a blue wavelength band, the second wavelength band is a red wavelength band, and the third wavelength band is a yellow or green wavelength band. 7. The light emitting device according to claim 6,
A matrix having a composition of SiO 2 having 30 to 60 mol%, Al 2 O 3 having 0 to 5 mol%, MgO having 10 to 30 mol%, and CaO having 20 to 40 mol%;
A glass-forming agent having a composition of 1 to 10 mol%; And
And a glass composition containing at least one of Eu oxide, Tb oxide and Ce oxide, which is doped in the matrix and emits light, having a composition of 1 to 3 mol% . The light emitting device according to claim 8, wherein the glass forming agent comprises B 2 O 3 . 9. The light emitting device according to claim 8, wherein the light emitting glass further comprises a glass modifier acting as a non-crosslinked oxygen in the glass composition. The light emitting device according to claim 10, wherein the free-form modifier is ZnO having a composition of 0 to 10 mol%. 7. The light emitting device according to claim 6, wherein the light emitting glass is transparent in a non-excited state. The light emitting device according to claim 6, wherein the color converting portion is a state in which the light emitting glass and the phosphor are sintered together.
KR1020120109201A 2012-09-28 2012-09-28 Light emitting glass and light emitting device using the same KR101733495B1 (en)

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Application Number Priority Date Filing Date Title
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KR101733495B1 KR101733495B1 (en) 2017-05-10

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Publication number Priority date Publication date Assignee Title
DE102005031523B4 (en) * 2005-06-30 2015-11-05 Schott Ag Semiconductor light source with light conversion medium made of glass ceramic
JP2009270091A (en) * 2008-05-06 2009-11-19 Mitsubishi Chemicals Corp Fluorescent glass, method of manufacturing fluorescent glass, semiconductor light-emitting device, and method of manufacturing semiconductor light-emitting device
JP5131841B2 (en) * 2008-07-09 2013-01-30 独立行政法人産業技術総合研究所 Red fluorescent glass

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