KR102407819B1 - Light emitting device - Google Patents

Abstract

A light emitting device is disclosed. The light emitting device includes: a light emitting unit including a light emitting element, a wavelength conversion unit positioned on the light emitting element, and an adhesive portion positioned between the light emitting element and the wavelength conversion unit; and a sidewall part that surrounds the side surface of the light emitting part and is in contact with the side surface of the light emitting part, and the adhesive part extends from the wavelength conversion part and the light emitting device to the side surface of the light emitting device and surrounds at least a portion of the side surface of the light emitting device, The portion of the adhesive portion positioned on the side surface of the light emitting device becomes thinner as it goes away from the wavelength conversion portion and has an inclined side surface, and an inclined portion of the side surface of the adhesive portion is in contact with the side wall portion, and the wavelength conversion portion It is formed to be larger than an area of a top surface of the light emitting device, and a side surface of the wavelength conversion unit is surrounded by the side wall portion.

Description

Light Emitting Device {LIGHT EMITTING DEVICE}

The present invention relates to a light emitting device, and more particularly, to a light emitting device in which color coordinate deviation between light emitting devices produced is reduced.

Light emitting diodes are inorganic semiconductor devices that emit light generated by recombination of electrons and holes, and are recently used in various fields such as displays, automobile lamps, and general lighting. Light emitting diodes have a long lifespan, low power consumption, and fast response speed, so a light emitting device including a light emitting diode is expected to replace a conventional light source.

Since such a light emitting diode emits light having a relatively narrow full width at half maximum, a general light emitting diode generally emits light close to a monochromatic color. Therefore, in order to implement white light in a light emitting device including a light emitting diode, a phosphor is generally used to induce a mixture of light to realize white light. Since the phosphor absorbs light with a relatively short wavelength and emits light with a relatively long wavelength, white light is emitted from the light emitting device by coating a light emitting diode that emits short wavelength light, such as a blue light emitting diode or UV light emitting diode, with the phosphor. Use the configuration that makes it possible.

In particular, in the case of a white light emitting device used for lighting, a light emitting device to which two or more kinds of phosphors are applied is used because high color rendering properties are required. For example, the light emitting device includes a blue light emitting diode and green and red phosphors positioned around the blue light emitting diode, and the blue light emitted from the blue light emitting diode and the green light and red light emitted after wavelength conversion from each phosphor are mixed to produce white light. This can be implemented.

However, when two or more types of phosphors are used as described above, the color coordinates of white light emitted from the light emitting device change depending on which phosphor first reaches the light emitted from the light emitting diode. Accordingly, color coordinate deviation between light emitting devices produced in the same process occurs, and thus the manufacturing yield of the light emitting device is deteriorated.

SUMMARY OF THE INVENTION An object of the present invention is to provide a light emitting device having a reduced color coordinate deviation of emitted light between produced light emitting devices.

A light emitting device according to an aspect of the present invention includes: a light emitting unit including a light emitting element, a wavelength conversion unit located on the light emitting element, and an adhesive unit located between the light emitting element and the wavelength conversion unit; and a sidewall part surrounding the side surface of the light emitting part and in contact with the side surface of the light emitting part, the adhesive part including a phosphor, and the wavelength of light emitted from the phosphor of the adhesive part is different from the wavelength of light emitted from the wavelength conversion part.

A peak wavelength of light emitted from the phosphor of the adhesive part may be longer than a peak wavelength of light emitted from the wavelength conversion part.

The phosphor of the adhesive part may be a red phosphor, and the wavelength conversion part may include a green phosphor or a yellow phosphor.

The adhesive part and the wavelength conversion part may each include one type of phosphor different from each other.

The wavelength converter may include a single crystal phosphor sheet.

The single-crystal phosphor sheet may include single-crystal YAG:Ce, and the bonding portion may include a red phosphor.

The adhesive portion may be formed to extend to a side surface of the light emitting device.

In addition, a portion of the adhesive portion positioned on the side surface of the light emitting device may have an inclined side surface.

An inclined portion of the side surfaces of the bonding portion may be in contact with the sidewall portion, and the sidewall portion may have a light reflective characteristic.

The foot device may further include a substrate, and the light emitting part and the sidewall part may be located on the substrate.

A light emitting device according to another aspect of the present invention includes a first light emitting element, a first wavelength conversion unit located on the light emitting element, and a first adhesive unit located between the first light emitting element and the first wavelength conversion unit a first light emitting unit including; The first light emitting unit is spaced apart from the second light emitting device, a second wavelength conversion unit positioned on the light emitting device, and a second adhesive portion positioned between the second light emitting device and the second wavelength conversion unit 2 light emitting part; Surrounding side surfaces of the first and second light emitting units, the first and second light emitting units include sidewalls in contact with side surfaces, and the first and second adhesive units include first and second phosphors, respectively, and The wavelength of the light emitted from the first phosphor is different from the wavelength emitted from the first wavelength converter, the wavelength of the light emitted from the second phosphor is different from the wavelength emitted from the second wavelength converter, and the first light emission The portion and the second light emitting portion emit light having different peak wavelengths.

The light emitting device may further include a substrate, and the first and second light emitting parts and the sidewall part may be positioned on the substrate.

The substrate may include first to fourth electrodes, the first and second electrodes are electrically connected to the first light emitting part, and the third and fourth electrodes are electrically connected to the second light emitting part. can

The first to fourth electrodes may be insulated from each other, and each of the first to fourth electrodes may be exposed on an outer surface of the substrate.

The first light emitting unit may emit white light.

In addition, the wavelength conversion unit may include a single crystal phosphor sheet.

The single-crystal phosphor sheet may include single-crystal YAG:Ce, and the bonding portion may include a red phosphor.

A peak wavelength of light emitted from the phosphor of the adhesive part may be longer than a peak wavelength of light emitted from the wavelength conversion part.

The adhesive part and the wavelength conversion part may each include one type of phosphor different from each other.

In some embodiments, the adhesive part may be formed to extend to a side surface of the light emitting device, and a portion of the adhesive part positioned on the side surface of the light emitting device may have an inclined side surface.

According to the present invention, by providing a light emitting device having an adhesive portion including a phosphor, it is easy to control the color coordinates of light emitted from the light emitting device, and it is possible to significantly reduce color coordinate deviation between light emitting devices manufactured in the same process. .

1 is a cross-sectional view for explaining a light emitting device according to an embodiment of the present invention.
2 to 4 are cross-sectional views for explaining a method of manufacturing a light emitting device according to another embodiment of the present invention.
5 to 8 are a perspective view, a plan view, a bottom plan view, and a cross-sectional view for explaining a light emitting device according to an embodiment of the present invention.
9 is a plan view for explaining a light emitting device according to another embodiment of the present invention.
10 is a front view for explaining a vehicle lamp according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The embodiments introduced below are provided as examples so that the spirit of the present invention can be sufficiently conveyed to those skilled in the art to which the present invention pertains. Accordingly, the present invention is not limited to the embodiments described below and may be embodied in other forms. And in the drawings, the width, length, thickness, etc. of the components may be exaggerated for convenience. In addition, when one component is described as being “on” or “on” another component, each component is different from each component as well as when each component is “immediately above” or “directly on” the other component. This includes cases where there is another component in between. Like reference numerals refer to like elements throughout.

1 is a cross-sectional view for explaining a light emitting device according to an embodiment of the present invention.

Referring to FIG. 1 , the light emitting device 10 includes a light emitting unit 100 including a light emitting element 110 , a wavelength converting unit 120 , and an adhesive unit 130 , and a sidewall unit 300 . Furthermore, the light emitting device 10 may further include a substrate 400 and a protection element (not shown).

The substrate 400 may be positioned at the bottom of the light emitting device 10 , and may serve to support the light emitting device 110 and the sidewall 300 . The substrate 400 may be an insulating or conductive substrate, or a PCB including a conductive pattern. When the substrate 400 is an insulating substrate, the substrate 400 may include a polymer material or a ceramic material, for example, a ceramic material having excellent thermal conductivity, such as AlN.

Also, the substrate 400 may include a base 410 , and further include a first electrode 421 and a second electrode 431 . In this case, the base 410 may serve to support the substrate 400 and the electrodes 421 and 431 as a whole, and may include an insulating material to insulate the electrodes 421 and 431 from each other. For example, the base 410 may include a ceramic material such as AlN having excellent thermal conductivity.

The first electrode 421 and the second electrode 431 may be insulated from each other, and may penetrate the base 410 vertically to be exposed on upper and lower portions of the base 410 . Accordingly, the electrodes 421 and 431 may be electrically connected to the light emitting device 110 positioned on the substrate 400 , and may also be electrically connected to an external power source through a portion exposed under the substrate 400 . It may be connected to supply power to the light emitting device 110 .

However, the present invention is not limited thereto, and the first and second electrodes 421 and 431 may have various shapes, and each of the first and second electrodes 421 and 431 may be formed in plurality. have. For example, at least one of the first and second electrodes 421 and 431 may be exposed through the side surface of the base 410 .

Meanwhile, in some embodiments, the substrate 400 may be omitted.

The light emitting device 110 may be positioned on the substrate 400 , and may include a light emitting structure 111 , a first pad electrode 113 , and a second pad electrode 115 .

The light emitting structure 111 may include an n-type semiconductor layer, a p-type semiconductor layer, and an active layer positioned between the n-type semiconductor layer and the p-type semiconductor layer. Accordingly, power is supplied to the first light emitting device 110 . Light can be emitted when supplied. The first pad electrode 113 and the second pad electrode 115 may be electrically connected to the n-type semiconductor layer and the p-type semiconductor layer (or vice versa), respectively. In particular, the first pad electrode 113 and the second pad electrode 115 may be formed to extend downwardly from the light emitting structure 111 , and accordingly, the first and second pad electrodes 113 and 115 are It may be located under the first light emitting device 110 . Alternatively, the first and second pad electrodes 113 and 115 may be positioned on the same plane as the lower surface of the light emitting structure 111 . Furthermore, the first and second pad electrodes 113 and 115 may be positioned higher than the lower surface of the light emitting structure 111 . In this case, grooves may be formed in the lower surface of the light emitting structure 111 , and the first and second pad electrodes 113 and 115 may be exposed in the grooves. The structural shape of the light emitting device 110 is not limited, and for example, a flip-chip semiconductor light emitting device in which the first pad electrode 113 and the second pad electrode 115 are positioned on one surface of the light emitting structure 111 . can be

The first and second pad electrodes 113 and 115 may be electrically connected to the first electrode 421 and the second electrode 431 of the substrate 400 , respectively. Accordingly, power may be supplied to the light emitting device 110 through the first and second electrodes 421 and 431 .

The wavelength converter 120 may be positioned on the light emitting device 110 , and may cover at least a portion of an upper surface of the light emitting device 110 . Furthermore, the wavelength conversion unit 120 may be formed to have substantially the same area as the upper surface of the light emitting device 110 , and unlike the diagram, the area of the wavelength conversion unit 120 is the upper surface area of the light emitting device 110 , as shown. can be larger than

The wavelength converter 120 may have a sheet form, and the wavelength converter 120 in the sheet form may be adhered to the light emitting device 110 . The wavelength conversion unit 120 in the form of a sheet may be adhered by the bonding unit 130 , and the bonding unit 130 will be described later in detail.

The wavelength conversion unit 120 may include a phosphor and a support for supporting the phosphor. The wavelength converter 120 may include various types of phosphors well known to those skilled in the art, for example, garnet-type phosphors, aluminate phosphors, sulfide phosphors, oxynitride phosphors, nitride phosphors, fluoride-based phosphors, silicate phosphors, and the like. The wavelength of the light emitted from the light emitting device 110 may be converted to emit light of various colors. For example, when the light emitting device 110 emits light having a peak wavelength in the blue light band, the wavelength converter 120 may emit light having a longer peak wavelength than blue light (eg, green light, red light, or yellow light). light) emitting phosphor. Alternatively, when the light emitting device 110 emits light having a peak wavelength in the UV band, the wavelength conversion unit 120 includes light having a peak wavelength of a longer wavelength than UV light (eg, blue light, green light, red light, or a phosphor that emits yellow light). Accordingly, white light may be emitted from the light emitting device 10 . However, the present invention is not limited thereto, and in particular, in the present embodiment, the wavelength converter 120 may include one type of phosphor.

The supporting part may include a polymer resin, a ceramic such as glass, and the like. The phosphors may be randomly disposed in the supporting part.

Meanwhile, in this embodiment, the wavelength converter 120 may include a single crystal material. The wavelength converter 120 including a single crystal material may be provided in the form of a phosphor sheet, and the wavelength converter 120 itself in the sheet form may be made of a single crystal phosphor, for example, the single crystal phosphor is a single crystal. YAG:Ce. Light passing through the wavelength conversion unit 120 including the single crystal phosphor sheet can emit light having a substantially constant color coordinate, so that the wavelength conversion unit 120 including the single crystal phosphor sheet is applied to a plurality of light emitting devices In this case, color coordinate deviation between the plurality of light emitting devices may be reduced.

The bonding unit 130 may be positioned between the light emitting device 110 and the wavelength converting unit 120 , and may serve to bond the light emitting device 110 and the wavelength converting unit 120 . The adhesive part 130 may include an adhesive material 131 and a phosphor 133 dispersed in the adhesive material 131 . The adhesive material 131 may be a general adhesive such as a polymer adhesive or a silicone adhesive.

The phosphor 133 included in the adhesive part 130 may convert the wavelength of light emitted from the light emitting device 110 . Accordingly, in the light emitting device according to the present embodiment, the light emitted from the light emitting device 110 may be wavelength-converted first by the bonding unit 130 , and then secondarily wavelength-converted by the wavelength conversion unit 120 . In this case, the wavelength of the wavelength-converted light emitted from the phosphor 133 of the bonding unit 130 and the wavelength of the wavelength-converted light by the wavelength conversion unit 120 may be different from each other. Furthermore, the peak wavelength of the wavelength-converted light by the phosphor 133 of the bonding unit 130 may be longer than the peak wavelength of the wavelength-converted light by the wavelength converting unit 120 . For example, the phosphor 133 of the bonding unit 130 may emit red light, and the wavelength conversion unit 120 may emit green light or yellow light. Accordingly, it is possible to prevent the light emitted from the light emitting device 10 from having an unexpected color coordinate because the wavelength-converted light in the bonding unit 130 is again converted to a wavelength in the wavelength converting unit 120 .

According to the present embodiment, the light emitted from the light emitting device 110 is primarily wavelength-converted by the phosphor 133 included in the bonding unit 130 , and then is secondarily wavelength-converted by the wavelength conversion unit 120 . Accordingly, since the light emitted from the light emitting device 110 is wavelength-converted over two steps, light having a substantially uniform color coordinate with respect to the plurality of light emitting devices 10 may be emitted. That is, color coordinate deviation between the plurality of light emitting devices 10 may be reduced.

Moreover, when two or more types of conventional phosphors are used, it is difficult to predict which phosphor first wavelength-converts light emitted from the light emitting device, so it is difficult to reduce color coordinate deviation between a plurality of light emitting devices. However, according to the present invention, when the bonding unit 130 includes one type of phosphor and the wavelength conversion unit 120 also includes one type of phosphor, the color coordinate deviation between the plurality of light emitting devices 10 is further reduced. can do it

Furthermore, the color coordinates of the light emitted from the light emitting device 10 can be easily adjusted by adjusting the type and concentration of the phosphor included in the adhesive part 130 . In particular, even when the same wavelength converters are applied to the plurality of light emitting devices 10 , color coordinates of the light emitting devices 10 can be easily adjusted by adjusting only the phosphor 133 included in the adhesive part 130 .

In particular, when the wavelength converter 120 includes a single-crystal phosphor sheet, the single-crystal phosphor sheet cannot control the concentration of the phosphor, so that the color coordinates of the light emitted from the wavelength converter 120 are almost constant. In this case, the color coordinates of the light emitted from the light emitting device 10 can be easily adjusted by adjusting the type and concentration of the phosphor 133 included in the adhesive part 130 . Accordingly, it is possible to easily control the color coordinates of the light emitting device 10 including the single crystal phosphor sheet, while remarkably reducing the color coordinate deviation of the plurality of light emitting devices 10 produced in the same process.

Meanwhile, the adhesive part 130 may be positioned between the light emitting device 110 and the wavelength converter 120 , and further, may further cover at least a portion of a side surface of the light emitting device 110 . When the area of the wavelength conversion unit 120 is larger than the upper surface of the light emitting device 110 , as illustrated, the adhesive portion 130 formed on the side surface of the light emitting device 110 may have an inclination. In this case, the adhesive portion 130 may be formed in a shape in which the width becomes narrower from the top to the bottom by the surface tension thereof.

Since the adhesive part 130 is also formed on the side surface of the light emitting device 110 , the wavelength of the light emitted from the light emitting device 110 may be more effectively converted. In addition, since the adhesive portion 130 formed on the side surface of the light emitting device 110 has an inclination, the side wall portion 300 is also formed to be inclined, so that light emitted from the light emitting device 110 may be reflected upward. Accordingly, the luminous efficiency of the light emitting device 10 may be increased.

However, the present invention is not limited thereto, and the adhesive portion 130 may be formed to extend to the lower surface of the light emitting device 110 , and further may be in contact with the side surfaces of the first and second pad electrodes 113 and 115 . have.

The side wall part 300 may cover the side surface of the light emitting part 100 , and specifically, the side surface of the light emitting device 110 , the side surface of the adhesive part 130 , and the side surface of the wavelength conversion part 120 . Furthermore, a portion of the sidewall portion 300 may further cover a portion of the lower surface of the light emitting device 110 . In this case, side surfaces of the pad electrodes 113 and 115 may be surrounded by the sidewall part 300 .

The sidewall part 300 may support the light emitting device 110 and may also protect the light emitting device 110 from an external environment. Furthermore, the sidewall part 300 may serve to reflect light. Since the sidewall part 300 is formed on the outer side of the light emitting device 10 , the light emitted from the light emitting part 100 may be focused upward. In particular, when the adhesive part 130 is formed to extend to the side surface of the light emitting device 110 and has an inclination, the sidewall part 300 of a portion in contact with the side surface of the adhesive part 130 may be inclined. Accordingly, the luminous efficiency of the light emitting device 10 may be further improved.

However, the present invention is not limited thereto, and the angle of light emitted from the light emitting unit 100 may be adjusted by adjusting the reflectivity and light transmittance of the sidewall part 300 as necessary.

The sidewall part 300 may include an insulating polymer material or ceramic, and further include a filler capable of reflecting or scattering light. The sidewall part 300 may have light transmittance, light semitransmission, or light reflectivity. For example, the sidewall part 300 may include a silicone resin or a polymer resin such as an epoxy resin, a polyimide resin, or a urethane resin. In the present embodiment, the sidewall part 300 may include a white silicone resin having light reflectivity.

The filler may be uniformly dispersed in the sidewall part 300 . The filler is not limited as long as it is a material capable of reflecting or scattering light, and may be, for example, titanium oxide (TiO ₂ ), silicon oxide (SiO ₂ ), or zirconium oxide (ZrO ₂ ). The sidewall part 300 may include at least one of the pillars. By adjusting the type or concentration of the filler, the reflectivity of the sidewall part 300 or the degree of light scattering may be adjusted.

Meanwhile, the upper surface of the sidewall part 300 and the upper surface of the light emitting part 100 may be at the same height. That is, as shown, the upper surface of the sidewall part 300 and the upper surface of the wavelength converter 120 may be formed to be flush with each other.

2 to 4 are cross-sectional views for explaining a method of manufacturing a light emitting device according to another embodiment of the present invention. 2 to 4 , the light emitting device as shown in FIG. 1 may be provided, and detailed description of the same configuration will be omitted.

Referring to FIG. 2 , the light emitting device 110 is disposed on a substrate 400 , and a pre-adhesive portion 130a is formed on the light emitting device 110 . The pre-adhesive part 130a may include an adhesive material and a phosphor, and may be a viscous material. The pre-adhesive part 130a may have a form in which a phosphor is dispersed in a silicone adhesive having viscosity. The pre-adhesive portion 130a may be formed using a method such as dispensing.

Next, referring to FIG. 3 , the wavelength conversion unit 120 is disposed on the light emitting device 110 , and the preliminary bonding portion 130a between the wavelength converting unit 120 and the light emitting device 110 is formed by the light emitting device 110 . ) can be spread along the top surface of Accordingly, as shown in FIG. 4 , the pre-adhesive portion 130a may be positioned between the light emitting device 110 and the wavelength conversion unit 120 , and further extends to the side surface of the light emitting device 110 and spreads. can In particular, since the pre-adhesive portion 130a may be made of a viscous material, a side surface having an inclination as shown by its surface tension may be formed. Therefore, by adjusting the amount of the pre-adhesive portion 130a dispensed on the light emitting device 110 and the pressure of pressing the wavelength conversion unit 120 in the direction toward the light emitting device 110 , the pre-adhesive portion 130a is formed by the light emitting device. It is possible to adjust the degree of formation on the side of (110).

Thereafter, the light emitting device 10 as shown in FIG. 1 may be provided by curing the pre-adhesive portion 130a and forming the sidewall portion 300 .

5 to 8 are a perspective view, a plan view, a bottom plan view, and a cross-sectional view for explaining a light emitting device according to an embodiment of the present invention. 9 is a plan view for explaining a light emitting device according to another embodiment of the present invention.

The light emitting device 10a described with reference to FIGS. 5 to 8 is different from the light emitting device 10 described with reference to FIG. 1 in that it includes a plurality of light emitting units 100 and 200 . Hereinafter, the light emitting device 10a will be described with a focus on differences, and a detailed description of the same configuration will be omitted.

5 to 8 , the light emitting device 10a may include at least two light emitting units, and specifically, the light emitting device 10a includes a first light emitting unit 100 , a second light emitting unit 200 , and a side wall portion 300 . Furthermore, the light emitting device 10a may further include a substrate 400 and a protection element 310 .

The substrate 400 may be positioned at the bottom of the light emitting device 10a, and may serve to support the first and second light emitting units 100 and 200 and the sidewall unit 300 . The substrate 400 may include a base 410 , and further, may further include first to fourth electrodes 421 , 431 , 423 , and 433 .

The first to fourth electrodes 421 , 431 , 423 , and 433 may be insulated from each other, penetrate vertically through the base 410 , and may be exposed on upper and lower portions of the base 410 . Accordingly, the electrodes 421 , 431 , 423 , and 433 may be electrically connected to the first and second light emitting units 100 and 200 positioned on the substrate 400 , and further, the lower portion of the substrate 400 . It may be electrically connected to an external power source through the exposed portion to supply power to the first and second light emitting units 100 and 200 .

However, the present invention is not limited thereto, and the first to fourth electrodes 421 , 431 , 423 , and 433 may have various shapes. For example, at least one of the first to fourth electrodes 421 , 431 , 423 , and 433 may be exposed through the side surface of the base 410 , and also the first to fourth electrodes 421 , 431 , At least some of 423 and 433 may be electrically connected to each other. Also, depending on the number of light emitting units included in the light emitting device 10a, the light emitting device 10a may include five or more electrodes. The form of electrical connection between the light emitting units 100 and 200 and the electrodes will be described later in detail.

Meanwhile, in some embodiments, the substrate 400 may be omitted.

The first light emitting unit 100 and the second light emitting unit 200 may be positioned on the substrate 400 . The first light emitting unit 100 may include a first light emitting device 110 , a first wavelength conversion unit 120 , and a first adhesive unit 130 . The second light emitting unit 200 may include a second light emitting device 210 , a second wavelength conversion unit 220 , and a second adhesive unit 230 . The first light emitting unit 100 may emit light in a wavelength band different from that of the second light emitting unit 200 , for example, white light and amber color light, respectively.

In addition, the first light emitting unit 100 may include a light emitting structure 111 , a first pad electrode 113 , and a second pad electrode 115 , and the second light emitting unit 200 may include a light emitting structure 211 . , a third pad electrode 213 and a fourth pad electrode 215 may be included.

The first and second wavelength converters 120 and 220 may be positioned on the first and second light emitting devices 110 and 210, respectively, and may include a phosphor. In addition, the first and second wavelength conversion units 120 and 220 may further include a supporting unit supporting the phosphor. In particular, the first and second wavelength converters 120 and 220 may include single-crystal phosphor sheets, and the single-crystal phosphor sheets may be, for example, single-crystal YAG:Ce.

The first and second adhesive portions 130 and 230 may be positioned between the light emitting devices 110 and 210 and the wavelength converters 120 and 220, respectively. In addition, the first and second adhesive portions 130 and 230 may include an adhesive material and a phosphor dispersed in the adhesive material, respectively.

The first and second pad electrodes 113 and 115 may be electrically connected to the first electrode 421 and the second electrode 431 of the substrate 400 , respectively. Accordingly, power may be supplied to the first light emitting device 110 through the first and second electrodes 421 and 431 . Also, the third pad electrode 213 may be electrically connected to the third electrode 423 , and the fourth pad electrode 215 may be electrically connected to the fourth electrode 433 . Accordingly, power may be supplied to the second light emitting device 210 through the third and fourth electrodes 423 and 433 .

Accordingly, the first light emitting device 110 and the second light emitting device 120 may be electrically connected to separate electrodes 421 , 431 , 423 , and 433 , respectively. By separately connecting power supplied to the electrodes 421 , 431 , 423 , and 433 , the first light emitting unit 100 and the second light emitting unit 200 may be independently driven. However, the present invention is not limited thereto, and the electrodes 421 , 431 , 423 , and 433 may be electrically interconnected with each other. Furthermore, the light emitting device 10a may further include a separate control unit (not shown), and the driving of the first light emitting unit 100 and the second light emitting unit 200 may be controlled by the control unit.

In some embodiments, the second wavelength converter 220 may not include a phosphor. For example, when the wavelength band of the light to be emitted from the second light emitting unit 200 substantially coincides with the wavelength band of the light emitted from the second light emitting device 210 , the second wavelength conversion unit 220 includes a phosphor You may not. In this case, the second wavelength converter 220 may include a light scattering agent such as TiO ₂ .

The sidewall part 300 may cover side surfaces of the first and second light emitting devices 110 and 210 , and further, may further cover side surfaces of the first and second wavelength converters 120 and 220 . The sidewall part 300 may be in contact with the first and second light emitting parts 100 and 200 . In addition, a portion of the sidewall portion 300 may further cover a portion of lower surfaces of the first and second light emitting devices 110 and 210 , and in this case, the sidewalls of the pad electrodes 113 , 115 , 213 and 215 are sidewalls. It may be surrounded by the part 300 .

In addition, the thickness of the sidewall part 300 formed between the first light emitting part 100 and the second light emitting part 200 may be smaller than the thickness of the outer side edge of the sidewall part 300 . That is, as shown in FIG. 2 , the thickness x of the sidewall part 300 filling the spaced region between the first light emitting part 100 and the second light emitting part 200 is the second from the outer side of the sidewall part 300 . The thickness y corresponding to the shortest distance to one side of the first and second light emitting units 100 and 200 may be smaller than y. Accordingly, the distance between the first and second light emitting units 100 and 200 can be minimized to further miniaturize the light emitting device 10a, and further, the first and second light emitting units 100 and 200 can be removed from the outside. more effective protection.

In addition, the light emitting device 10a according to the present embodiments may further include a protection element 310 . The protection element 310 may be disposed in the sidewall part 300 and may include, for example, a Zener diode. The protection element 310 is electrically connected to at least one of the first and second light emitting elements 110 and 120 to prevent the first and second light emitting elements 110 and 120 from being damaged due to electrostatic discharge. can The protection element 310 may be separately connected to each of the first and second light emitting elements 110 and 120 , or may be simultaneously connected to the first and second light emitting elements 110 and 120 .

According to the above-described embodiments, the light emitting devices 10 , 10a , and 10b include a first light emitting unit 100 and a second light emitting unit 200 spaced apart from each other on a substrate 400 , and the The first and second light emitting units 100 and 200 are electrically connected to different electrodes, respectively. Accordingly, the first light emitting unit 100 and the second light emitting unit 200 may be driven independently of each other, and a light emitting device 10a that selectively emits light of a different color may be provided as needed. Accordingly, it is possible to omit separately manufacturing at least two or more light emitting devices emitting light of different colors, thereby simplifying the manufacturing process. Furthermore, since only one light emitting device can emit light of a plurality of colors, it is possible to reduce a space ratio occupied by the light emitting device in a specific application device.

Meanwhile, the light emitting device according to the present invention is not limited to the above-described embodiment, and may include three or more light emitting units. For example, as shown in FIG. 9 , the light emitting device 10b may include a plurality of first light emitting units 100 and a plurality of second light emitting units 200 . The plurality of first light emitting units 100 may be connected to each other in series or parallel, and the plurality of second light emitting units 200 may also be connected to each other in series or parallel. As described above, since the light emitting device 10c includes three or more light emitting units, the light emitting intensity of the light emitting device 10b may be improved.

In addition, the light emitting device of the present invention may include light emitting units that emit light of three or more colors.

The light emitting device described in the above embodiments may emit light of two or more colors from one light emitting device. Such a light emitting device may be applied to an application device requiring a plurality of light emitting colors, for example, may be applied to a vehicle lamp. Hereinafter, a vehicle lamp including a light emitting device according to embodiments of the present invention will be described with reference to FIG. 10 .

10 is a front view for explaining a vehicle lamp according to another embodiment of the present invention.

Referring to FIG. 7 , the vehicle lamp 20 according to the present embodiment may include a combination lamp 23 , and further, may further include a main lamp 21 . The vehicle lamp 20 may be applied to various parts of a vehicle, such as a headlight, a backlight, or a side mirror light.

The main lamp 21 may be a main light emitting lamp in the vehicle lamp 20 , and for example, when the vehicle lamp 20 is used as a headlight, it may serve as a headlight illuminating the front of the vehicle.

The combination lamp 23 may include the light emitting device 10a according to embodiments of the present invention. The combination lamp 23 may perform at least two or more functions. For example, when the vehicle lamp 20 is used as a headlight, the combination lamp 23 may function as a daytime running light (DRL) and a turn indicator lamp.

Specifically, in the vehicle including the vehicle lamp 20 of the present embodiment, the light emitting device 10a of the combination lamp 23 emits white light from the first light emitting unit 100 during normal driving of the vehicle. emits Accordingly, the combination lamp 23 may function as a daytime running lamp by emitting white light. In addition, when turning on the turn signal lamp of the vehicle, the light emitting device 10a of the combination lamp 23 turns off the power of the first light emitting unit 100 and the second light emitting unit 200 ) emits amber-colored light. Accordingly, the combination lamp 23 may function as a direction indicator by emitting light of an amber color. The operation of the combination lamp 23 and the light emitting device 10a may be controlled by a separate controller (not shown).

In this way, the light emitting device 10a according to embodiments of the present invention may be used as a light source of the combination lamp 23 capable of performing at least two functions by emitting light of two or more colors. Since the light emitting device 10a according to embodiments of the present invention includes light emitting units emitting at least two or more different wavelengths of light, when manufacturing the vehicle lamp 20 including the combination lamp 23, separate two The above-described process of mounting the light emitting device may be omitted. Accordingly, the defect rate of the vehicle lamp 20 can be reduced, and the manufacturing process can be simplified to improve the process yield. In addition, since the volume of the light emitting device 10a is relatively small, a space constraint in manufacturing the combination lamp 23 may be reduced, and various modifications and changes of the combination lamp 23 may be facilitated.

However, the present invention is not limited thereto, and the light emitting device may be applied to various other application devices other than vehicle lamps. In addition, the present invention is not limited to the various embodiments and features described above, and various modifications and changes are possible without departing from the technical spirit of the claims of the present invention.

Claims (14)

Board;
a light emitting unit including a light emitting device disposed on the substrate, a wavelength converting unit disposed on the light emitting device, and an adhesive disposed between the light emitting device and the wavelength converting unit; and
Surrounding the side surface of the light emitting unit, comprising a side wall portion in contact with the side surface of the light emitting unit,
The adhesive portion extends to the side surface of the light emitting device between the wavelength conversion unit and the light emitting device and surrounds at least a portion of the side surface of the light emitting device,
The portion of the adhesive portion located on the side surface of the light emitting device becomes thinner as it goes away from the wavelength conversion unit, and has an inclined side surface,
The inclined portion of the side surface of the bonding portion is in contact with the side wall portion,
The wavelength conversion unit is formed to be larger than the upper surface area of the light emitting device,
The side of the wavelength conversion part is surrounded by the side wall part,
An outer surface of the substrate is parallel to an outer surface of the side wall portion. The method according to claim 1, wherein the adhesive comprises a phosphor,
The light emitted from the light emitting device is primarily wavelength-converted by the bonding unit, and is secondarily wavelength-converted by the wavelength conversion unit to be emitted to the outside. The light emitting device of claim 1, wherein the sidewall portion in contact with the adhesive portion is inclined. The light emitting device of claim 1 , wherein the bonding part is formed to extend to a lower surface of the light emitting element. The method according to claim 1, wherein the light emitting device comprises a first pad electrode and a second pad electrode disposed on opposite sides of the wavelength conversion unit,
The adhesive portion is in contact with side surfaces of the first pad electrode and the second pad electrode. 6. The method of claim 5,
side surfaces of the first pad electrode and the second pad electrode are surrounded by the sidewall portion. The method according to claim 1,
The side wall portion is a light emitting device covering a side surface of the light emitting element, a side surface of the bonding unit, and a side surface of the wavelength conversion unit. The light emitting device of claim 7 , wherein a top surface of the adhesive part in contact with the wavelength conversion part has the same height as a top surface of the wavelength conversion part. The light emitting device of claim 1, wherein the sidewall part partially covers a lower surface of the light emitting element. The light emitting device according to claim 1, wherein the side wall portion reflects light. The light emitting device according to claim 1, wherein the light emitting part is at least two. The light emitting device of claim 11 , wherein the at least two light emitting units emit light of different wavelengths. The light emitting device of claim 11 , wherein the at least two light emitting units can be driven independently of each other. The light emitting device of claim 11 , wherein a thickness of a sidewall formed between the light emitting units is smaller than a thickness of a sidewall formed outside of the light emitting units.

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