Light emitting device and light source module having thereof

A light emitting device according to an embodiment includes a body having a recess; a light emitting chip disposed in the recess; and a first dampproof layer sealing the light emitting chip and extended from a surface of the light emitting chip to a bottom of the recess, wherein the light emitting chip includes a wavelength range of 100 nm to 280 nm, and the first dampproof layer includes a fluororesin-based material.

CROSS-REFERENCE TO RELATED PATENT APPLICATIONS

This application is a U.S. National Stage Application under 35 U.S.C. § 371 of PCT Application No. PCT/KR2015/007423, filed Jul. 17, 2015, which claims priority to Korean Patent Application No. 10-2014-0097088, filed Jul. 30, 2014, whose entire disclosures are hereby incorporated by reference.

TECHNICAL FIELD

The present invention relates to a light emitting device and a light source module including the same.

BACKGROUND ART

A light emitting diode may configure a light emitting source by using compound semiconductor materials such as GaAs-based, AlGaAs-based, GaN-based, InGaN-based and InGaAlP-based materials.

Such a light emitting diode is packaged and used as a light emitting device emitting various colors, and the light emitting device is used as a light source in various fields such as a lighting indicator displaying a color, a character indicator, and an image indicator.

In particular, in the case of an ultraviolet light emitting diode (UV LED), it is used for sterilization and purification in the case of a short wavelength, and it may be used in an exposure apparatus or a curing apparatus in the case of a long wavelength. However, the environment in which the UV LED of a short wavelength is applied is mostly highly humid or inside water, so that dampproof and waterproof functions are deteriorated, and thus device failure is caused and operation reliability may be deteriorated.

DISCLOSURE

Technical Problem

The embodiment provides a light emitting device having a new waterproof and dampproof structure.

The embodiment provides a light emitting device having a dampproof layer covering a surface of a light emitting chip.

The embodiment provides a light emitting device having a dampproof layer covering a surface of a body in which a light emitting chip is disposed.

The embodiment provides a light emitting device including a dampproof layer extended from a light transmitting layer disposed on a light emitting chip to a surface of a body.

The embodiment provides a light emitting device having a plurality of dampproof layers covering a surface of body and a surface of a light emitting chip.

The embodiment provides a light emitting device having a body and a dampproof layer covering a surface of a substrate.

The embodiment provides a light emitting device having a dampproof layer including an ultraviolet light emitting chip and fluorine and a light source module.

The embodiment provides a light emitting device having a dampproof layer protecting an ultraviolet light emitting chip and a protection device from water or moisture and a light source module.

The embodiment may improve the reliability of an ultraviolet light source module.

Technical Solution

According to an embodiment, there is provided a light emitting device including a body having a recess; a light emitting chip disposed in the recess; and a first dampproof layer sealing the light emitting chip and extended from a surface of the light emitting chip to a bottom of the recess, and the light emitting chip includes a wavelength range of 100 nm to 280 nm, and the first dampproof layer includes a fluororesin-based material.

According to an embodiment, there is provided a light emitting device including a body having a recess; a light emitting chip disposed in the recess; a light transmitting layer disposed on the recess, and a first dampproof layer extended from an upper surface of the light transmitting layer to an upper surface of the body, and the light emitting chip includes a wavelength range of 100 nm to 280 nm, and the first dampproof layer includes a fluororesin-based material.

According to an embodiment, there is provided a light source module including a light emitting device having a first dampproof layer on a surface of a body; and a circuit board disposed below the body of the light emitting device, and the first dampproof layer of the light emitting device is extended to a side surface of the body and an upper surface of the circuit board.

Advantageous Effects

The embodiment may be provided as a waterproof module within a product applied to high humidity and underwater environments.

The embodiment may be provided as a sterilizing device in a high humidity environment and underwater.

The embodiment may reduce transmission loss of a UV-C wavelength.

The embodiment may minimize discoloration and deterioration by UV-C.

MODES OF THE INVENTION

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying drawing so that a person skilled in the art to which the present invention belongs can easily carry out. However, the present invention may be embodied in many different forms and not limited to the embodiments described herein.

Throughout the specification, when a part is referred to as “including” an element, it means that the part may include other elements as well without excluding the other elements unless specifically stated otherwise. In order to clearly illustrate the present invention in the drawing, parts which are not related to the description are omitted, and in respect to similar parts throughout the specification, similar reference numbers are added.

In the description of an embodiment, when a part such as a layer, a film, an area, and a plate are “above” another part, not only a case in which the part is “directly above” another part but also a case in which there is another part therebetween are included. Conversely, when a part is “directly above” another part, it means that there is no other part therebetween.

Hereinafter, a light emitting device according to a first embodiment of the present invention will be described with reference toFIGS. 1 to 6.

FIG. 1is a perspective view of a light emitting device according to a first embodiment,FIG. 2is a perspective view in which a light transmitting layer is removed in theFIG. 1,FIG. 3is a floor plan view of the light emitting device of theFIG. 1in which the light transmitting layer is removed,FIG. 4is a rear view of the light emitting device of theFIG. 1,FIG. 5is an A-A side cross-sectional view of the light emitting device of theFIG. 1andFIG. 6is a B-B side cross-sectional view of the light emitting device of theFIG. 3.

Referring toFIGS. 1 to 6, a light emitting device100includes a body110having a recess111, a plurality of electrodes121,123and125disposed in the recess111, a light emitting chip131disposed on at least one of the plurality of electrodes121,123and125, a light transmitting layer161disposed on the recess111, and a fluororesin-based dampproof layer171covering a surface of the light emitting chip131. The light emitting chip131may emit a UV-C wavelength, which is an ultraviolet wavelength ranging from 100 nm to 280 nm. The wavelength of the light emitting chip131is not limited thereto, and the light emitting chip131may emit at least one wavelength of visible light or infrared light.

The body110includes an insulating material such as a ceramic material. The ceramic material includes a low temperature co-fired ceramic (LTCC) or a high temperature co-fired ceramic (HTCC) which is co-fired at the same time. The material of the body110may be AIN, and may be formed of a metal nitride having a thermal conductivity of 140 W/mK or more.

As shown inFIGS. 5 to 6, a connection pattern117may be disposed in the body110, and the connection pattern117may provide an electrical connection path between the recess111and a lower surface of the body110.

An upper periphery of the body110includes a stepped structure115. The stepped structure115is disposed at an upper periphery of the recess111as an area which is lower than an upper surface of the body110. The depth of the stepped structure115is a depth from the upper surface of the body110and it may be formed deeper than the thickness of the light transmitting layer161, but it is not limited thereto.

The recess111is a region where a part of the upper portion of the body110is opened and it may be formed of a predetermined depth from the upper surface of the body110. For example, the recess111may be formed in a lower depth than the stepped structure115of the body110. Here, a direction in which the recess111is formed may be a direction in which light generated from the light emitting chip131is emitted.

The recess111may have a polygonal shape, a circle shape or an elliptical shape. The recess111may have a chamfered shape, for example, a curved shape. Here, the recess111may be located further inside than the stepped structure115of the body110.

A width of a lower portion of the recess111may be the same as a width of an upper portion of the recess111or the width of the upper portion may be formed larger. Also, a side wall116of the recess111may be formed to be vertical or inclined with respect to an extension line of a bottom surface of the recess111.

As shown inFIGS. 2 to 3, a plurality of sub recesses112and113may be disposed in the recess111. A bottom surface of each of the sub recesses112and113may be disposed at a lower depth than the bottom surface of the recess111. A space between the plurality of sub recesses112and113may be greater than the width of the light emitting chip131. A protection device133may be disposed on at least one of the plurality of sub recesses112and113. The depth of each of the sub recesses112and113may be equal to or deeper than the thickness of the protection device133. The depth of each of the sub recesses112and113may be formed in a depth such that an upper surface of the protection device133does not protruded above the bottom surface of the recess111. As the protection device133is disposed on at least one of the sub recesses112and113, the protection device133does not protrude above the bottom surface of the recess111and absorption of light emitted from the light emitting chip131may be reduced, deterioration of the light extraction efficiency may be prevented, and it is possible to prevent the directivity angle of the light from being distorted.

The plurality of sub recesses112and113are disposed on opposite sides based on the light emitting chip131. Accordingly, heat generated from the light emitting chip131may be uniformly distributed in the recess111, and thus the heat resistance of the light emitting device may be improved. As another example, the protection device133may be disposed in a first sub recess112of the plurality of sub recesses112and113, and the other second sub recess113may be used as a dummy. The protection device133includes a Zener diode. The protection device133is connected in parallel to the light emitting chip131and electrically protects the light emitting chip131. The first and second sub recesses112and113may not be formed, and in this case, the protection device133may be removed or disposed at the bottom of the recess111.

Electrodes121,123,125,127and129are disposed in the recess111and the sub recesses112and113, and the electrodes121,123,125,127and129selectively supply power to the light emitting chip131and the protection device133. The electrodes121,123,125,127and129may optionally include a metal such as platinum (Pt), titanium (Ti), copper (Cu), nickel (Ni), gold (Au), tantalum (Ta) and aluminum (Al). At least one of the electrodes121,123,125,127and129may be formed as a single layer or multiple layers. Here, in an electrode of multiple layers, a gold (Au) material having good bonding may be disposed on a top layer, and a material of titanium (Ti), chromium (Cr) or tantalum (Ta) having good adhesion to the body110may be disposed on a lowest layer, and platinum (Pt), nickel (Ni), copper (Cu) or the like may be disposed on a middle layer between the top layer and the lowest layer. The present invention is not limited to the laminated structure of such electrodes.

Describing the electrodes121,123,125,127and129specifically, a first electrode121on which the light emitting chip131is disposed, a second electrode123and a third electrode125spaced apart from the first electrode121, and fourth and fifth electrodes127and129respectively disposed in the sub recesses112and113are included. The first electrode121is disposed at a center of the bottom of the recess111, and the second electrode123and the third electrode125may be disposed at both sides of the first electrode121. Any one of the first electrode121and the second electrode123may be removed, but the present invention is not limited thereto. As another example, the light emitting chip131may be disposed on a plurality of electrodes of the first to third electrodes121,123and125, but the present invention is not limited thereto.

One of the fourth and fifth electrodes127and129, for example, the fourth electrode127may be electrically connected to the protection device133.

Power of a first polarity may be supplied to the second and third electrodes123and125, and power of a second polarity may be supplied to the first, fourth and fifth electrodes121,127and129. Polarity of each of the electrodes121,123,125,127and129may vary depending on an electrode pattern or connection method with each device, and is not limited thereto.

Here, in the case in which the first electrode121is not electrically connected to the light emitting chip131, the first electrode121may be used as a non-polar metal layer or a heat dissipation plate. Each of the electrodes121,123,125,127and129may be defined as a metal layer, but is not limited thereto.

A portion121A of the first electrode121may extend into the body110and may be electrically connected to another electrode through the connection pattern117. The first to fifth electrodes121,123,125,127and129may be selectively connected to the connection pattern117inside the body110. For example, the connection pattern117connects the first electrode121, the fourth and fifth electrodes127and129and a first pad141each other, and it may connect the second and third electrodes123and125and a second pad145each other, but the present invention is not limited thereto.

As shown inFIGS. 4 to 6, a plurality of pads141and145are disposed on the lower surface of the body110. The plurality of pads141and145includes a first pad141and a second pad145, and the first and second pads141and145may be spaced apart from each other on the lower surface of the body110. At least one of the first and second pads141and145may be disposed in a plural, and may disperse a current path, but is not limited thereto.

A radiation member (not shown) may be disposed in the body110. The radiation member may be disposed below the light emitting chip131, that is, below the first electrode121, and it may dissipate heat generated from the light emitting chip131. The material of the radiation member may be a metal, for example, an alloy.

A light emitting chip131may be disposed in the recess111. The light emitting chip131is a UV LED, and may be an UV LED emitting a wavelength in the range of 100 nm to 280 nm. That is, the light emitting chip131may emit short wavelength ultraviolet of 280 nm or less. The ultraviolet wavelength has an effect of reducing various biological pollutants such as bacteria and viruses.

The light emitting chip131may be bonded to the first electrode121by a conductive adhesive and may be connected to the second electrode123by a first connection member135. The light emitting chip131may be electrically connected to the first electrode121, the second electrode123or the third electrode125. The connection method of the light emitting chip131may be connected by selectively using wire bonding, die bonding, and flip bonding, and such a bonding method may be changed depending on a chip type and an electrode position of the chip. The protection device133may be bonded to the fourth electrode127and may be connected to the third electrode125by a second connection member137, and it may be electrically connected to the third electrode125and the fourth electrode127. The first and second connection members135and137include wire for example.

The light emitting chip131may be formed of a compound semiconductor of group II and VI elements, or a compound semiconductor of group III and V elements. The light emitting chip131may selectively include a semiconductor light emitting device manufactured by using a compound semiconductor such as AlInGaN, InGaN, AlGaN, GaN, GaAs, InGaP, AlInGaP, InP, and InGaAs. The light emitting chip131may include an n-type semiconductor layer, a p-type semiconductor layer, and an active layer. The active layer may be implemented as a pair such as InGaN/GaN, InGaN/AlGaN, InGaN/InGaN, GaN/AlGaN, InAlGaN/InAlGaN, AlGaAs/GaAs, InGaAs/GaAs, InGaP/GaP, AlInGaP/InGaP, and InP/GaAs.

The dampproof layer171is formed on the recess111, and may have a thickness covering an upper surface of the light emitting chip131. For example, the dampproof layer171is formed to be thicker than the light emitting chip131to protect the light emitting chip131from water or moisture.

The dampproof layer171may include fluorine. The fluorine has a strong chemical bonding force with carbon and does not cause molecular bond breakage due to ultraviolet. The dampproof layer171may be defined as a fluororesin-based layer, and a molecular chain of the dampproof layer171is a helical structure, and the molecular chain structure has a three-dimensional spiral structure, so that fluorine atoms seal around a carbon-carbon bond. The dampproof layer171protects the destruction of molecular chains due to penetration of ultraviolet or oxygen. Also, the dampproof layer171may protect the device by blocking oxygen or moisture such as water or oil from penetrating to the surface of the device as much as possible. The dampproof layer171transmits light emitted from the light emitting chip131as a translucent material.

Also, the dampproof layer171may be used with at least one of PCTFE (Polychlorotrifluoroethylene), ETFE (Ethylene+Tetrafluoroethylene), FEP (Fluorinated ethylene propylene copolymer), and PFA (Perfluoroalkoxy). In the graph of the transmittance ofFIG. 19, the transmittance is high in the order of PCTFE, ETFE, FEP, and PFA in an ultraviolet range, and in the moisture absorption ratio at an ultraviolet wavelength according to the dampproof material ofFIGS. 20 and 21, PCTFE, FEP, and PFA are shown in that order. Therefore, at least one of PCTFE, FEP, and PFA may be used as a dampproof layer.

The dampproof layer171is attached to the surface of the light emitting chip131and may be extended to the bottom surface of the recess111. The dampproof layer171may be extended from the bottom of the recess111to the side wall116. The dampproof layer171is sealed to top and side surfaces of the light emitting chip131and the bottom surface and the side wall116of the recess111to protect the light emitting chip131from water or moisture.

The dampproof layer171prevents water from penetrating into the interface between the light emitting chip131and the bottom surface of the recess111.

Also, the dampproof layer171seals the plurality of electrodes121,123,125,127and the protection device133. This dampproof layer171may prevent water from penetrating into the protection device133. Since the dampproof layer171is effective for dampproofing in the recess111, so a water resistant light emitting device may be provided.

By using the dampproof layer171with a fluororesin material, there is no damage such as bond breaking between molecules due to the ultraviolet wavelength emitted from the light emitting chip131, and a decrease in light extraction efficiency may be minimized.

Referring toFIG. 5, a thickness of the dampproof layer171may be equal to or less than 1 mm, and the thickness may cover at least the light emitting chip131, and when it is more than 1 mm, the transmittance of ultraviolet may be reduced. A thickness T1from the upper surface of the light emitting chip131may be formed, for example, in the range of 0.5 μm to 10 μm. When the thickness T1of the dampproof layer171exceeds the above range, the light transmittance is remarkably decreased, and when it is less than the above range, the humidity resistance is reduced.

The dampproof layer171according to the embodiment may have a transmittance of 70% to 95% with respect to the wavelength emitted from the light emitting chip131. When the transmittance is less than 70%, the optical reliability may be deteriorated due to a decrease in function. The dampproof layer171may transmit the light without damaging the light emitted from the light emitting chip131.

In one example of a coating method of the dampproof layer171, a fluororesin-based dampproof layer of liquid melting fluorine in a resin solvent is coated. Table 1 is a table for measuring the transmittance according to a fluorine content. The content of fluorine dissolved in the resin solvent was tested after being dissolved and coated in the range of 1 to 3 wt %. As follows, when the fluorine content is 1 wt %, the average transmittance after curing is 94.5%, and in the case of 2 wt %, the average transmittance after curing is 90.4%, and in the case of 3 wt %, the average transmittance after curing is 82.9%.

It may be seen that the transmittance is decreased as the content of fluorine is increased. The fluorine content in the dampproof layer171according to the embodiment may be smaller after curing, but is not limited thereto.

Also, the transmittance may be changed according to the number of layers to be coated, that is, the number of times of dipping. For example, as the number of times of dipping increases, the transmittance may be reduced. When the transmittance is 100% in the case in which the dampproof layer171is not formed on the light emitting chip131, the transmittance after dipping once is 90.60%, the transmittance after dipping twice is 89.22%, the transmittance after dipping three times is 79.97%, the transmittance after dipping four times is 75.86%, and the transmittance after dipping five times is 72.13%. Also, it may be seen that as the number of times of dipping increases, the thickness is increased and the transmittance is decreased. The embodiment may provide a structure in which the dampproof layer171has a thickness of 10 μm or less from the top surface of the light emitting chip131for the transmittance and moisture resistance.

As shown inFIGS. 1, 5 and 6, a light transmitting layer161is disposed on the recess111. The light transmitting layer161includes a glass material such as quartz glass. Accordingly, the light transmitting layer161may be defined as a material capable of transmitting light emitted from the light emitting chip131without damaging such as bond breakage between molecules due to the ultraviolet wavelength.

An outer periphery of the light transmitting layer161is coupled to the stepped structure of the body110. An adhesive layer163is disposed between the light transmitting layer161and the stepped structure115of the body110, and the adhesive layer163includes a resin material such as silicone or epoxy. The light transmitting layer161may have a width wider than the width of the recess111. A lower surface area of the light transmitting layer161may be larger than a bottom surface area of the recess111. Accordingly, the light transmitting layer161may be easily coupled to the stepped structure115of the body110.

The light transmitting layer161may be spaced apart from the light emitting chip131. Since the light transmitting layer161is spaced apart from the light emitting chip131, heat expansion caused by the light emitting chip131may be reduced. A region between the light transmitting layer161and the dampproof layer171may be an empty space or may be filled with a nonmetal or a metal chemical element, but the present invention is not limited thereto. A lens may be coupled onto the light transmitting layer161but the present invention is not limited thereto. Further, a molding member is further disposed on the side surface of the body110, and may perform dampproofing and device protection.

FIG. 7is a side cross-sectional view of a light emitting device according to a second embodiment.

Referring toFIG. 7, the light emitting device according to the embodiment includes a body110having a recess111, a plurality of electrodes121,123, and125disposed in the recess111, a light emitting chip131disposed on at least one of the plurality of electrodes121,123,125, a light transmitting layer161disposed on the recess111, and a fluororesin-based dampproof layer172disposed on the light transmitting layer161and an upper surface of the body110.

The light emitting chip131may emit an ultraviolet wavelength, that is, a wavelength in the range of 100 nm to 280 nm. The light transmitting layer161may be formed of a transparent material, such as glass, which is free from damage due to the ultraviolet wavelength. The dampproof layer172is extended from an upper surface of the light transmitting layer161to the upper surface of the body110. The dampproof layer172has a fluororesin-based material, and may transmit light without breaking bonds between molecules by the light emitted from the light emitting chip131.

The dampproof layer172covers the upper surface of the body110and the upper surface of the light transmitting layer161to block water or moisture penetrating the upper surface of the body110. The dampproof layer172may be in contact with an adhesive layer163bonded to the light transmitting layer161and a stepped structure115of the body110.

The dampproof layer172may be formed to have a thickness ranging from 0.5 μm to 10 μm, and the thickness may vary depending on the number of dips of the dampproof layer172, but it may be a thickness range that the transmittance is 70% or more. When the thickness of the dampproof layer172exceeds the above mentioned range, the light transmittance is remarkably decreased, and when the thickness is less than the above range, moisture resistance is deteriorated. The dampproof layer172may be extended from the upper surface of the body110to a side surface portion of the body110, but the present invention is not limited thereto. By further extending the dampproof layer172to a part of the side surface of the body110, a water- or moisture-blocking effect may be further increased.

A lens may be coupled onto the dampproof layer172, but the present invention is not limited thereto. Further, a molding member may be further disposed on the side surface of the body110to perform dampproofing and device protection.

FIG. 8is a side cross-sectional view of a light emitting device according to a third embodiment.

Referring toFIG. 8, the light emitting device according to the embodiment includes a body110having a recess111, a plurality of electrodes121,123, and125disposed in the recess111, a light emitting chip131disposed on at least one of the plurality of electrodes121,123and125, a light transmitting layer161disposed on the recess111, and a fluororesin-based dampproof layer174disposed on an upper surface of the light transmitting layer161and upper and side surfaces of the body110.

The light emitting chip131may emit an ultraviolet wavelength, that is, a wavelength in the range of 100 nm to 280 nm. The light transmitting layer161may be formed of a glass material having no damage, such as bonding failure between molecules due to the ultraviolet wavelength. The dampproof layer174is extended from the upper surface of the light transmitting layer161to the upper surface of the body110. The dampproof layer174has a fluororesin-based material and may transmit light without being broken by the light emitted from the light emitting chip131.

The dampproof layer174may be extended from the upper surface of the light transmitting layer161to the upper surface and the side surface of the body110for dampproofing. The dampproof layer174is disposed on the entire upper surface area of the light transmitting layer161, the entire upper surface area of the body110, and the entire side surface area of the body110, and water or moisture may be prevented from permeating through the body110and other components. A thickness of the dampproof layer174may be in the range of 0.5 μm to 10 μm, when the thickness of the dampproof layer174exceeds the above mentioned range, the light transmittance is remarkably decreased, and when the thickness is less than the above range, moisture resistance is deteriorated. The dampproof layer174may be extended on a lower surface of the body110, and in this case, it may be formed on an area except the first and second pads141and145. Accordingly, water or moisture penetrating into the lower surface of the body110may be blocked.

A lens may be coupled onto the dampproof layer174, but the present invention is not limited thereto. Further, a molding member may be further disposed on an outer side part of the dampproof layer174, and it may perform dampproofing and device protection.

FIG. 9is a side cross-sectional view of a light emitting device according to a fourth embodiment.

Referring toFIG. 9, the light emitting device according to the embodiment includes a body110having a recess111, a plurality of electrodes121,123, and125disposed in the recess111, a light emitting chip131disposed on at least one of the plurality of electrodes121,123and125, a first dampproof layer171A sealing the light emitting chip131on the recess111, a light transmitting layer161disposed on the recess111, and a second dampproof layer174A disposed on an upper surface of the light transmitting layer161and upper and side surfaces of the body110.

The light emitting chip131may emit an ultraviolet wavelength, that is, a wavelength in the range of 100 nm to 280 nm. The light transmitting layer161may be formed of a glass material having no damage due to the ultraviolet wavelength. The first and second dampproof layers171A and174A have fluororesin-based materials and may transmit light without being broken by the light emitted from the light emitting chip131.

The first dampproof layer171A may be adhered and extended to a bottom of the recess111from a surface of the light emitting chip131in the recess111. The first dampproof layer171A blocks water or moisture penetrating into the light emitting chip131in the recess111. The first dampproof layer171A may be extended and contacted to a side wall of the recess111, but is not limited thereto. The distance between an upper surface of the first dampproof layer171A and an upper surface of the light emitting chip131may be equal to or less than 10 μm and the distance between the bottom of the recess111and the upper surface of the first dampproof layer171A may be equal to or less than 1 mm. When the first dampproof layer171A exceeds 10 μm from the upper surface of the light emitting chip131, light transmittance or moisture barrier rate may be significantly lowered, and when the distance between the bottom of the recess111and the upper surface of the first dampproof layer171A is more than 1 mm, the light transmittance may be remarkably lowered.

The second dampproof layer174A may be extended from the upper surface of the light transmitting layer161to the upper surface of the body110or may be extended from the upper surface of the light transmitting layer161to the upper surface and the side surface of the body110. Also, the second dampproof layer174A may be extended to a lower surface of the body110and may block water or moisture penetrating through the lower surface of the body110. The second dampproof layer174A may prevent water or moisture from penetrating through the surface of the body110. The second dampproof layer174A may have a thickness of 10 μm or less, and when the thickness is more than 10 μm, the light transmittance and the moisture barrier rate may be decreased.

The material of the first and second dampproof layers171A and174A may be used with at least one of PCTFE (Polychlorotrifluoroethylene), ETFE (Ethylene+Tetrafluoroethylene), FEP (Fluorinated ethylene propylene copolymer) and PFA (Perfluoroalkoxy). The first and second dampproof layers171A and174A may include the same material or different materials. For example, the first and second dampproof layers171A and174A may be formed of PCTFE, or the first dampproof layers171A may be formed of PCTFE and the second dampproof layer174A may be formed of ETFE, different from the material of the first dampproof layer. Alternatively, the first dampproof layer171A may be formed of a material having a higher water or moisture blocking rate (hereinafter, abbreviated as dampproof ratio) than the second dampproof layer174A and may protect the light emitting chip131. On the contrary, the second dampproof layer174A is formed of a material having a higher dampproof ratio than the first dampproof layer171A, so that the dampproof ratio may be increased primarily on the surface of the light emitting device. The first dampproof layer171A may be formed of a material having a higher transmittance than the second dampproof layer174A, and a decrease in transmittance may be reduced. The embodiment may be effective for dampproofing by performing double dampproofing through the first and second dampproof layers171A and174A.

A lens may be coupled onto the second dampproof layer174A, but the present invention is not limited thereto. Further, a molding member may be further disposed on an outer side part of the second dampproof layer174A, and may perform dampproofing proof and device protection.

FIG. 10is a side cross-sectional view of a light emitting device according to a fifth embodiment.

Referring toFIG. 10, the light emitting device according to the embodiment includes a body110having a recess111, a plurality of electrodes121,123, and125disposed in the recess111, a light emitting chip131disposed on at least one of the plurality of electrodes121,123and125, a first dampproof layer171A sealing the light emitting chip131on the recess111, a light transmitting layer161disposed on the recess111, a second dampproof layer173disposed on an upper surface outer periphery of the light transmitting layer161and upper and side surfaces of the body110.

The light emitting chip131may emit an ultraviolet wavelength, that is, a wavelength in the range of 100 nm to 280 nm. The light transmitting layer161may be formed of a glass material having no damage due to the ultraviolet wavelength. The first and second dampproof layers171A and173have fluororesin-based materials and may transmit light without being broken by the light emitted from the light emitting chip131.

The first dampproof layer171A may be extended to a bottom of the recess111from a surface of the light emitting chip131in the recess111. The first dampproof layer171A blocks water or moisture penetrating into the light emitting chip131in the recess111. The first dampproof layer171A may be contacted to a side wall of the recess111, but is not limited thereto. The distance between an upper surface of the first dampproof layer171A and an upper surface of the light emitting chip131may be equal to or less than 10 μm, and when the distance exceeds 10 μm, light transmittance and moisture barrier rate may be lowered. The second dampproof layer173may be extended from the outer periphery of the upper surface of the light transmitting layer161to the upper surface of the body110or may be extended from the outer periphery of the upper surface of the light transmitting layer161to the upper surface and the side surface of outer side of the body110, and it may block water or moisture. Also, the second dampproof layer173may be extended to a lower surface of the body110and may block water or moisture penetrating through the lower surface of the body110.

The second dampproof layer173has an open region173B and the upper surface of the light transmitting layer161may be exposed through the open region173B. The second dampproof layer173may be disposed so as not to overlap a bottom region of the recess111in a vertical direction. A width D2of the open region173B of the second dampproof layer173may be wider than or equal to a bottom width D1of the recess111. By disposing the open area173B in the second dampproof layer173, the interference with the light emitted from the light emitting chip131is minimized and the light extraction efficiency may be improved.

The second dampproof layer173may prevent water or moisture from penetrating through the surface of the body110. A thickness of the second dampproof layer173may be about 0.5 μm to 10 μm. When the thickness of the second dampproof layer173exceeds the above range, the light transmittance is remarkably decreased, and when the thickness is less than the above range, moisture resistance may be deteriorated.

A lens may be coupled onto the second dampproof layer173, but the present invention is not limited thereto.

The material of the first and second dampproof layers171A and173may be used with at least one of PCTFE (Polychlorotrifluoroethylene), ETFE (Ethylene+Tetrafluoroethylene), FEP (Fluorinated ethylene propylene copolymer) and PFA (Perfluoroalkoxy). The first and second dampproof layers171A and173may include the same material or different materials. For example, the first and second dampproof layers171A and173may be formed of PCTFE, or the first dampproof layer171A may be formed of PCTFE and the second dampproof layer173may be formed of ETFE different from the material of the first dampproof layer171A.

In addition, the first dampproof layer171A may be formed of a material having a higher dampproof ratio than the second dampproof layer173to protect the light emitting chip131, or the second dampproof layer173is formed of a material having a higher dampproof ratio than the first dampproof layer171A, and may increase the primary dampproof ratio on the surface of the light emitting device. The first dampproof layer171A may be formed of a material having a higher transmittance than the second dampproof layer173among the materials, thereby reducing a decrease in transmittance. Further, a molding member is further disposed on an outer side part of the second dampproof layer173, and may perform dampproofing and device protection.

FIG. 11is a side cross-sectional view of a light emitting device according to a sixth embodiment.

Referring toFIG. 11, the light emitting device according to the embodiment includes a body110having a recess111, a plurality of electrodes121A and125A disposed in the recess111, a light emitting chip131A disposed on at least one of the plurality of electrodes121A and125A, a first dampproof layer171A covering a surface of the light emitting chip131A and a light transmitting layer161disposed on the first dampproof layer171A.

The light emitting chip131A may emit an ultraviolet wavelength, that is, a wavelength in the range of 100 nm to 280 nm. The light emitting chip131A is arranged on the plurality of electrodes121A and125A in a flip chip manner. Since the light emitting chip131A is disposed in a flip chip manner, it is not necessary to dispose a separate connection member, so water or moisture through the connection member connected to the light emitting chip131A may be blocked, and defect of the connection member may be prevented.

The light emitting chip131A according to the embodiment may be disposed in the recess111in a flip chip manner and the first dampproof layer171A may be disposed in the recess111. As another example, the structure of the first dampproof layer171A may selectively adopt the embodiments described above, but the present invention is not limited thereto.

Also, a second dampproof layer176may be disposed on a lower surface of the body110. The second dampproof layer176may be disposed on the lower surface of the body110and may be in contact with the first and second pads141and145as a fluororesin-based dampproof layer. The second dampproof layer176is disposed on the lower surface of the body110and may block the penetration of water or moisture through the first and second pads141and145. The second dampproof layer176may be extended from the lower surface of the body110to a side surface portion, and it may prevent penetration of water or moisture. Further, a molding member is further disposed on an outer side part of the body110and may perform moisture proof and device protection.

FIG. 12is a side cross-sectional view of a light emitting device according to a seventh embodiment.

Referring toFIG. 12, the light emitting device according to the embodiment includes a body110having a recess111, a plurality of electrodes121A and125A disposed in the recess111, a light emitting chip131A disposed on the plurality of electrodes121A and125A, a first dampproof layer171B covering a surface of the light emitting chip131A and a light transmitting layer161disposed on the first dampproof layer171B.

The light emitting chip131A may emit an ultraviolet wavelength, that is, a wavelength in the range of 100 nm to 280 nm. The light emitting chip131A is disposed on the plurality of electrodes121A and125A, for example, in a flip chip manner. Since the light emitting chip131A is disposed in a flip chip manner, it is not necessary to dispose a separate connection member, so water or moisture through the connection member connected to the light emitting chip131A may be prevented, and defect of the connection member may be prevented.

The light emitting device according to the embodiment may be disposed in the recess111in a flip chip manner and the first dampproof layer171B may be disposed in the recess111. The dampproof layer171B may be extended from upper surfaces of the first and second electrodes121A and125A to an upper surface of the light emitting chip131A in a stepped structure. Accordingly, the dampproof layer171B may provide a uniform dampproof effect in the region of the recess111. Further, a molding member may be further disposed on an outer side of the body110to perform dampproofing and device protection. A thickness of an upper surface of the dampproof layer171B from the upper surface of the light emitting chip131A may be, for example, in the range of 0.5 μm to 10 μm. When the thickness of the dampproof layer171B exceeds the above mentioned range, light transmittance is remarkably decreased. When the thickness of the dampproof layer171B is less than the above range, moisture resistance may be deteriorated. In the embodiment, the light emitting device is described as being disposed in the recess111in a flip chip manner, but the present invention is not limited thereto. The light emitting device may be disposed in the recess in a horizontal or vertical manner.

FIG. 13is a side cross-sectional view of a light emitting device according to an eighth embodiment.

Referring toFIG. 13, the light emitting device according to the embodiment includes a body110having a recess111, a plurality of electrodes121A and125A disposed in the recess111, a light emitting chip131A disposed on the plurality of electrodes121A and125A, a light transmitting layer161disposed on the recess111, and a dampproof layer171C disposed on a lower surface of the light transmitting layer161.

The dampproof layer171C may be disposed on the lower surface of the light transmitting layer161, and the outer peripheries thereof may be adhered to an adhesive163. Thus, the step of forming the dampproof layer171C in a separate area is simplified, and the dampproof layer171C is formed on the lower surface of the light transmitting layer161, so that the dampproof layer171C may be disposed in the coupling step of the light transmitting layer161. Further, the outer side part of the dampproof layer171C is vertically overlapped with a stepped structure115, so that water or moisture penetration through the stepped structure115may be prevented.

The light emitting chip131A may emit an ultraviolet wavelength, that is, a wavelength in the range of 100 nm to 280 nm. The light emitting chip131A may be disposed on the electrodes121A and125A in a flip chip manner or may be connected to the connection member described above. However, the present invention is not limited thereto. A thickness of the dampproof layer171C may be in the range of 0.5 μm to 10 μm, when the thickness of the dampproof layer171C exceeds the above range, light transmittance is remarkably decreased, and when less than the above range, moisture resistance is reduced.

FIG. 14is a side cross-sectional view of a light emitting device according to a ninth embodiment.

Referring toFIG. 14, the light emitting device according to the embodiment includes a body110having a recess111, a plurality of electrodes121A and125A disposed in the recess111, a light emitting chip131A disposed on the plurality of electrodes121A and125A, and a dampproof layer171A covering a surface of the light emitting chip131A.

A side wall116of the recess111may be extended in a vertical direction from an upper surface of the body110, thereby simplifying the manufacturing process. Further, by removing a light transmitting layer in the recess111, light loss due to the light transmitting layer may be reduced.

The light emitting chip131A may emit an ultraviolet wavelength, that is, a wavelength in the range of 100 nm to 280 nm. The light emitting chip131A may be disposed on the electrodes121A and125A in a flip chip manner. An upper surface of the dampproof layer171A may be formed in a flat surface or a stepped structure as shown inFIG. 12. A thickness of the dampproof layer171A may be less than or equal to 1 mm, and the thickness may cover at least the light emitting chip131A, and when it exceeds 1 mm, the transmittance of ultraviolet may be reduced. A thickness from an upper surface of the light emitting chip131A may be formed, for example, in the range of 0.5 μm to 10 μm. When the thickness of the dampproof layer171A exceeds the above mentioned range, light transmittance is remarkably decreased, and when the thickness is less than the above range, moisture resistance is deteriorated.

FIG. 15is a side cross-sectional view of a light source module according to a tenth embodiment.

Referring toFIG. 15, the light source module according to the embodiment includes a body110having a recess111, a plurality of electrodes121,123and125disposed in the recess111, a light emitting chip131disposed on at least one of the plurality of electrodes121,123and125, a light transmitting layer161disposed on the recess111, a circuit board201disposed below the body110, and a dampproof layer175disposed on an upper surface of the light transmitting layer161, an upper surface and a side surface of the body110, and an upper surface of the circuit board201.

The light emitting chip131may emit an ultraviolet wavelength, that is, an ultraviolet wavelength in the range of 100 nm to 280 nm. The light emitting chip131may be arranged in a flip chip manner or by die bonding. The light transmitting layer161may be formed of a glass material having no damage, such as bonding failure between molecules due to the ultraviolet wavelength. The dampproof layer175has a fluororesin-based material, and may transmit light without being broken by the light emitted from the light emitting chip131. The dampproof layer175may be extended from the upper surface of the light transmitting layer161to the upper surface of the body110and the upper surface of the circuit board201. The dampproof layer175may block water or moisture penetrating through the side surface and the upper surface of the body110, as well as water or moisture penetrating the circuit board201. A thickness of the dampproof layer175may be in the range of 0.5 μm to 10 μm, and when the thickness of the dampproof layer175is more than the above range, light transmittance is remarkably decreased, and when less than the above range, moisture resistance is reduced.

A portion175A of the dampproof layer175may be disposed in a region between a lower surface of the body110and the circuit board201, and may block water or moisture penetration.

The circuit board201includes a plurality of bonding pads204and205and the plurality of bonding pads204and205may be electrically connected to first and second pads141and145disposed on the lower surface of the body110.

The circuit board201may be connected to signal cables211and213through external connection terminals207and208, and the signal cables211and213may supply power from the outside. The dampproof layer175covers the bonding portions of the external connection terminals207and208and the signal cables211and213, and it may prevent water or moisture penetration.

The plurality of the signal cables211and213are spaced apart from each other and may be drawn out through the dampproof layer175.

FIG. 16is a side cross-sectional view of a light source module according to an eleventh embodiment.

Referring toFIG. 16, the light source module according to the embodiment includes a body110having a recess111, a plurality of electrodes121,123and125disposed in the recess111, a light emitting chip131disposed on at least one of the plurality of electrodes121,123and125, a light transmitting layer161disposed on the recess111, a circuit board201disposed below the body110, a dampproof layer177extended from an upper surface of the light transmitting layer161to an upper surface of the body110, and a molding member181covering the body110and a surface of the circuit board201.

The light emitting chip131may emit an ultraviolet wavelength, that is, a wavelength in the range of 100 nm to 280 nm. The light transmitting layer161may be formed of a glass material having no damage due to the ultraviolet wavelength. The dampproof layer177may be extended from the upper surface of the light transmitting layer161to the upper surface of the body110to block water or moisture penetrating into the body110. The dampproof layer177has a fluororesin-based material, and may transmit light without causing bonding destruction between molecules by the light emitted from the light emitting chip131.

The dampproof layer177may be provided in the form of a film, and an adhesive layer164is bonded between the dampproof layer177and the upper surface of the body110. The adhesive layer164may be an adhesive for ultraviolet. An outer frame portion177A of the dampproof layer177may protrude further outward than a side surface of the body110, so that coupling force with the molding member181may be increased. Water or moisture may be double-blocked by the molding member181and the dampproof layer177.

Since the dampproof layer177is provided in a film form, it is bonded to the upper surfaces of the body110and the light transmitting layer161and may be provided with a thickness of 1 mm or less, for example, a thickness ranging from 0.025 mm to 1 mm. Since a coating layer according to dipping is not formed on the dampproof layer177in a film form, the transmittance may be maintained at 70% or more even if it is provided thicker than the dipping process. In the case in which the dampproof layer177is thicker than 1 mm, light extraction efficiency may be lowered, and in the case in which the thickness is less than 0.025 mm, transmittance is improved, but a work process becomes difficult due to warping or wrinkling.

The circuit board201is disposed below the body110and is electrically connected to the light emitting chip131in the body110. The circuit board201may include a connector210and the connector210is connected to signal cables211and213supplying power.

The molding member181is molded on the side surface of the body110and the surface of the circuit board201.

The molding member181has an open region182and the open region182exposes the dampproof layer177. An upper portion181A of the molding member181may be adhered to the outer frame portion177A of the dampproof layer177and a lower portion181B may cover a lower surface of the circuit board201. A width D3of the open region182may be equal to or wider than a width of the light transmitting layer161. By providing the open region182, light loss due to the contact interface between the molding member181and the dampproof layer177may be reduced.

The molding member181may be formed of a resin material such as silicone, epoxy, or urethane. An upper surface of the molding member181may be disposed at a higher position than the upper surface of the body110and may be in close contact with an upper surface of the dampproof layer177. Accordingly, the dampproof layer177may prevent water or moisture from penetrating into the body110.

The molding member181molds the connector210and the signal cables211and213to expose a part of the signal cables211and213. Accordingly, by dampproofing with the dampproof layer177and by molding the surfaces of the circuit board201, the connector210and the signal cables211and213with the molding member181, it is possible to prevent water or moisture from penetrating through the interface between the circuit board201and the body110. As another example, a dampproof layer may be disposed in the recess111of the body110, but the present invention is not limited thereto.

FIG. 17is a side cross-sectional view of a light source module according to a twelfth embodiment.

Referring toFIG. 17, the light source module according to the embodiment includes a body110having a recess111, a plurality of electrodes121,123and125disposed in the recess111, a light emitting chip131disposed on at least one of the plurality of electrodes121,123and125, a light transmitting layer161disposed on the recess111, a circuit board201disposed below the body110, a dampproof layer178extended from an upper surface of the light transmitting layer161to an upper surface and a side surface of the body110and an upper surface of the circuit board201and a molding member183extended from a lower surface of the circuit board201to an outer side surface of the dampproof layer178.

The light emitting chip131may emit an ultraviolet wavelength, that is, a wavelength in the range of 100 nm to 280 nm. The light transmitting layer161may be formed of a glass material having no damage due to the ultraviolet wavelength. The dampproof layer178has a fluororesin-based material and may transmit light without being broken by the light emitted from the light emitting chip131. The dampproof layer178is extended from the upper surface of the light transmitting layer161to the upper surface and the side surface of the body110. The dampproof layer178is extended to the upper surface of the circuit board201. A portion of the dampproof layer178is disposed between a lower surface of the body110and the circuit board201to block water or moisture penetrating the lower surface of the body110. A thickness of the dampproof layer178may be in the range of 0.5 μm to 10 μm, and when the thickness of the dampproof layer178exceeds the above range, light transmittance is remarkably decreased, and when less than the above range, moisture resistance is reduced.

A part of signal cables211and213connected to the circuit board201is coated with the dampproof layer178.

The molding member183is molded on the outer side part of the dampproof layer178and the surface of the circuit board201. The molding member183is molded on the outer side part of the dampproof layer178disposed on the side surface of the body110to double-protect the side surface of the body110.

The molding member183has an open region, and the open region exposes an upper surface of the dampproof layer178. The molding member183may be formed of a resin material such as silicone, epoxy, or urethane. An upper surface of the molding member183may be disposed higher than the upper surface of the body110and may be the same horizontal surface with the upper surface of the dampproof layer178. Thus, the surface shape of the light emitting device is flattened, and water or moisture may be prevented from being collected in a non-flat region.

The molding member183molds a part of the signal cables211and213and exposes a part of the signal cables211and213. Accordingly, by dampproofing with the dampproof layer178and by molding the surfaces of the outer side part of the dampproof layer178, the circuit board201, and the signal cables211and213with the molding member183, it is possible to prevent water or moisture from penetrating through the interface between the circuit board201and the body110. As another example, a dampproof layer may be disposed in the recess111of the body110, but the present invention is not limited thereto.

FIG. 18is a side cross-sectional view of a light source module according to a thirteenth embodiment.

Referring toFIG. 18, the light source module according to the embodiment includes a body110having a recess111, a plurality of electrodes121,123and125disposed in the recess111, a light emitting chip131disposed on at least one of the plurality of electrodes121,123and125, a light transmitting layer161disposed on the recess111, a circuit board201disposed below the body110, a dampproof layer178extended from an upper surface of the light transmitting layer161to an upper surface and a side surface of the body110and an upper surface of the circuit board201, a molding member183extended from a lower surface of the circuit board201to an outer side part of the dampproof layer178, and a case221on a surface of the molding member183. Among these configurations, the same parts as those ofFIG. 17will be described with reference toFIG. 17.

The case221covers a side surface and a lower surface of the molding member183. That is, the light source module ofFIG. 17is inserted into a housing part of the case221. The case221may be coupled with a cover223having an open region. The open region of the cover223may be opened in a region corresponding to the recess111. The cover223covers the upper surface of the molding member183. The case221and the cover223may be formed of a plastic material, but are not limited thereto.

The cover223may be bonded or fastened to the case221. The case221and the cover223protect the entire module from an external impact. In addition, the case221may prevent water or moisture from penetrating through a lower portion.

The light emitting device and the light source module including the same according to the embodiment may be used as a device for sterilizing an indoor unit, an evaporator and condensed water of a refrigerator, and a sterilizing device in an appliance such as a air washer, and a sterilizing device for a water reservoir and discharge water of a water purifier, and a sterilizing device in a toilet. Such a sterilizing device may optionally include the above-described dampproof layer.

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 may be combined or modified by other persons skilled in the art to which the embodiments belong. Accordingly, it is to be understood that such combination and modification are included in the scope of the present invention.

INDUSTRIAL APPLICABILITY

The light emitting device of the embodiment may improve the reliability of dampproofing.

The light emitting device of the embodiment may be applied to a sterilizing apparatus.