Source: https://patents.google.com/patent/CN102194929B/en
Timestamp: 2020-04-07 08:32:51
Document Index: 418352139

Matched Legal Cases: ['application No.10', 'art 20', 'art 20', 'art 20', 'art 20', 'art 20', 'art 20', 'art 20', 'art 20', 'art 20']

CN102194929B - Luminescent device - Google Patents
CN102194929B
CN102194929B CN201010621716.5A CN201010621716A CN102194929B CN 102194929 B CN102194929 B CN 102194929B CN 201010621716 A CN201010621716 A CN 201010621716A CN 102194929 B CN102194929 B CN 102194929B
CN201010621716.5A
CN102194929A (en
丁焕熙
2010-03-10 Priority to KR20100021289A priority Critical patent/KR101014155B1/en
2010-03-10 Priority to KR10-2010-0021289 priority
2010-12-28 Application filed by Lg伊诺特有限公司 filed Critical Lg伊诺特有限公司
2011-09-21 Publication of CN102194929A publication Critical patent/CN102194929A/en
2015-08-12 Publication of CN102194929B publication Critical patent/CN102194929B/en
The invention provides a kind of luminescent device and light emitting device package.This luminescent device comprises: the first electrode; Ray structure, this ray structure comprises the first semiconductor layer, active layer and the second semiconductor layer that are positioned on described first electrode; Second electrode, this second electrode is positioned on described ray structure; And reflecting member, this reflecting member is at least positioned in the lateral surface of described second electrode.
This application claims the priority of the korean patent application No.10-2010-0021289 submitted on March 10th, 2010, the full content of this korean patent application is incorporated to by way of reference at this.
Embodiment relates to a kind of luminescent device and light emitting device package.
Embodiment provides a kind of luminescent device and the light emitting device package with new Ying's structure.
Embodiment still provides a kind of luminescent device with the luminous efficiency of raising.
Embodiment still provides a kind of luminescent device with the light extraction efficiency of raising.
Embodiment still provides a kind of luminescent device sending even light.
In one embodiment, luminescent device comprises: the first electrode; Ray structure, this ray structure comprises the first semiconductor layer, active layer and the second semiconductor layer that are positioned on described first electrode; Second electrode, this second electrode is positioned on described ray structure; And reflecting member, this reflecting member is at least positioned in the lateral surface of described second electrode.
In another embodiment, luminescent device comprises: the first electrode; Be positioned at the adhesion layer on this first electrode; Be positioned at the reflector on this adhesion layer; Be positioned at the ohmic contact layer on this reflector; To be positioned on adhesion layer and the channel layer be arranged in the lateral surface of ohmic contact layer; Ray structure, the second semiconductor layer that this ray structure comprises the first semiconductor layer be positioned on this channel layer and ohmic contact layer, is positioned at the active layer on this first semiconductor layer and is positioned on this active layer; Be positioned at the second electrode on this ray structure, this second electrode at least has the non-planar surface of inclination at its lateral surface place; At least be positioned at the reflecting member in the lateral surface of the second electrode, the shape of this reflecting member is corresponding with the shape of the lateral surface of the second electrode; And passivation layer, this passivation layer extends from the top surface of described channel layer to the lateral surface of described ray structure.
In another embodiment, light emitting device package comprises: main body; Be positioned at least one the lead-in wire electrode in this main body; And luminescent device, this luminescent device is electrically connected to described lead-in wire electrode, and wherein, this luminescent device comprises: the first electrode; Ray structure, this ray structure comprises the first semiconductor layer, active layer and the second semiconductor layer that are positioned on this first electrode; Be positioned at the second electrode on this ray structure; And the reflecting member be at least positioned in the lateral surface of the second electrode.
One or more embodiments of the detail are set forth in the the accompanying drawings and the following description.From this description and accompanying drawing and claim, further feature will become apparent.
In the description of each embodiment, will be understood that, when layer (or film), region, pattern or structure be called as substrate, layer (or film), region, pad or pattern " on " time, it can be located immediately on another layer or substrate, or also can have intermediate layer.In addition, will be understood that it can be located immediately at another layer of below, and also can have one or more intermediate layer when a layer is called as at another layer of D score.In addition, reference will be carried out based on accompanying drawing about every one deck "up" and "down".
Hereinafter, with reference to accompanying drawing, embodiment is described.In the accompanying drawings, for convenience of description and clear for the purpose of, the thickness of every layer or size can be exaggerated, omitted or schematically shown.In addition, the size of each element also not exclusively reflects actual size.
Fig. 1 is the side cross-sectional, view of the luminescent device according to the first embodiment, and Fig. 2 is the plane graph of the luminescent device that Fig. 1 is shown.
With reference to figure 1 and Fig. 2, the luminescent device 100 according to the first embodiment can comprise: the first electrode 175, the adhesion layer 170 be positioned on the first electrode 175, the reflector 160 be positioned on adhesion layer 170, the ohmic contact layer 150 be positioned on reflector 160, channel layer 140 around the top surface of adhesion layer 170, be arranged on ohmic contact layer 150 and channel layer 140 with produce light ray structure 135, be positioned at the second electrode 115 on ray structure 135 and be arranged in the reflecting member 190 of at least side of the second electrode 115.Ray structure 135 can comprise the first conductive-type semiconductor layer 130, active layer 120 and the second conductive-type semiconductor layer 110.
First electrode 175 can support multiple layer thereon and be used as electrode.First electrode 175 and the second electrode 115 can supply power to ray structure 135.
Such as, the first electrode 175 can comprise at least one that select from the group be made up of following item: Ti, Ni, Pt, Au, W, Cu, Mo, Cu-M and carrier wafer (such as, Si, Ge, GaAs, ZnO, SiC and SiGe).
The thickness that first electrode 175 can have the design according to luminescent device 100 and change.Such as, the first electrode 175 can have the thickness of about 30 μm to about 500 μm.
First electrode 175 can be plated in and/or be deposited on below ray structure 135, or can adhere to ray structure 135 with the form of sheet, but it is not limited thereto.
Adhesion layer 170 can be arranged on the first electrode 175.Adhesion layer 170 can be binder course, and can be arranged in below channel layer 140.Adhesion layer 170 has the lateral surface of exposure.Adhesion layer 170 can contact with the end of ohmic contact layer 150, reflector 160 and channel layer 140, thus be used as the medium of the adhesion strengthened between multiple layer, such as, channel layer 140, ohmic contact layer 150 and the adhesion between reflector 160 and the first electrode 175.
Adhesion layer 170 can be formed by barrier metal or in conjunction with metal.Such as, adhesion layer 170 can comprise at least one that select from the group be made up of following item: Ti, Au, Sn, Ni, Cr, Ga, In, Bi, Cu, Ag and Ta.
Reflector 160 can be arranged on adhesion layer 170.The light from ray structure 135 incidence can be reflected in reflector 160, to improve light extraction efficiency.
Such as, reflector 160 can comprise at least one that select from the group be made up of following item: Ag, Ni, Al, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au and Hf or its alloy, but it is not limited thereto.And reflector 160 can have following sandwich construction: it is formed by using the transparent conductive material of aforementioned metal and such as In-ZnO (IZO), Ga-ZnO (GZO), Al-ZnO (AZO), Al-Ga-ZnO (AGZO), In-Ga-ZnO (IGZO), indium zinc tin oxide (IZTO), indium aluminium zinc oxide (IAZO), indium gallium tin-oxide (IGTO), antimony tin oxide (ATO) etc.That is, such as, reflector 160 can have the sandwich construction of such as IZO/Ni, AZO/Ag, IZO/Ag/Ni or AZO/Ag/Ni etc.
Ohmic contact layer 150 can be arranged on reflector 160.Ohmic contact layer 150 can contact the first conductive-type semiconductor layer 130, so that electric power is fed to ray structure 135 reposefully.
Especially, ohmic contact layer 150 can be formed by one that selects from transparent conductive material and aforementioned metal.Such as, this ohmic contact layer can have single or multiple lift structure, its by use select from the group be made up of following item at least one and formed: indium tin oxide (ITO), indium-zinc oxide (IZO), indium zinc tin oxide (IZTO), indium aluminium zinc oxide (IAZO), indium gallium zinc oxide (IGZO), indium gallium tin-oxide (IGTO), aluminium zinc oxide (AZO), antimony tin oxide (ATO), gallium zinc oxide (GZO), IrOx, RuOx, RuOx/ITO, Ni, Ag, Ni/IrOx/Au, and Ni/IrOx/Au/ITO.
The end of ohmic contact layer 150 can contact with adhesion layer 170.Except the region overlapping with channel layer 140 of the first conductive-type semiconductor layer 130, ohmic contact layer 150 can contact the whole region of the first conductive-type semiconductor layer 130.As mentioned above, because ohmic contact layer 150 contacts the first conductive-type semiconductor layer 130 over as large an area as possible, so electric current can be fed to active layer 120 equably by the whole region contacted with ohmic contact layer 150 of the first conductive-type semiconductor layer 130.Therefore, luminous efficiency can be significantly improved.
Current barrier layer (CBL) 145 can be placed in contact the first conductive-type semiconductor layer 130 on ohmic contact layer 150.This CBL's 145 at least partially can be vertically overlapping with the second electrode 115.CBL 145 can stop by ohmic contact layer 150 to the electric current that the first conductive semiconductor layer 130 is supplied.Therefore, CBL 145 place and around, can stop to first conductive-type semiconductor layer 130 supply electric current supply.That is, CBL 145 can farthest prevent electric current from intensively flowing along the shortest path between the first electrode 175 and the second electrode 115.As a result, electric current flow between ohmic contact layer 150 and the first conductive-type semiconductor layer 130 except CBL 145 region.Therefore, because uniform current flow into the whole region of the first conductive-type semiconductor layer 130, so can luminous efficiency be significantly improved.
Although farthest prevent electric current to flow along the shortest path between the first electrode 175 and the second electrode 115 by CBL 145, the electric current flow through around this CBL 145 flow in the first conductive-type semiconductor layer 130 contacted with CBL 145, between the first electrode 175 and the second electrode 115 shortest path.Therefore, the electric current with same or similar distribution flow into the shortest path between the first electrode 175 and the second electrode 115, and flow into the region except this shortest path of the first conductive-type semiconductor layer 130.
CBL 145 can be formed than the conductivity of ohmic contact layer 150 or the low material of insulating properties by its conductivity or insulating properties, or is formed by the material with the first conductive-type semiconductor layer 130 shorted contacts.CBL 145 can comprise at least one that select from the group be made up of following item: ITO, IZO, IZTO, IAZO, IGZO, IGTO, AZO, ATO, ZnO, SiO 2, SiO x, SiO xn y, Si 3n 4, Al 2o 3, TiO x, Ti, Al and Cr.
CBL 145 can be arranged between ohmic contact layer 150 and the first conductive-type semiconductor layer 130, or is arranged between reflector 160 and ohmic contact layer 150, but it is not limited thereto.
And CBL 145 can be arranged in the groove that is formed in ohmic contact layer 150, it can be given prominence to from ohmic contact layer 150, or can be provided through in the top surface of ohmic contact layer 150 and the hole of basal surface, but it is not limited thereto.
Channel layer 140 can be arranged on the neighboring area (circumference region) of the top surface of adhesion layer 170.That is, channel layer 140 can be arranged on the neighboring area between ray structure 135 and adhesion layer 170.
Channel layer 140 can be formed by the material that its conductivity is less than the conductivity of ray structure 135, or is formed by the material that its insulating properties is less than the insulating properties of ray structure 135.Such as, channel layer 140 can by select in the group formed from following item at least one and formed: SiO 2, Si xo y, Si 3n 4, Si xn y, SiO xn y, Al 2o 3, TiO 2.In this case, can prevent from, between ray structure 135 and the first electrode 175, electric short circuit occurs.Therefore, the reliability of luminescent device 100 can be improved.
Alternately, channel layer 140 can be formed by the metal material with excellent adhesion, and this metal material is such as at least one that select from the group be made up of following item: Ti, Ni, Pt, Pd, Rh, Ir and W.In this case, channel layer 140 can strengthen the adhesion between ray structure 135 and adhesion layer 170, to improve the reliability of luminescent device 100.And, because channel layer 140 can not be broken, or the fragment of channel layer 140 can not be produced in chip separation process, so can improve the reliability of luminescent device 100, described chip separation process is such as the laser scribe process multiple chip being divided into independent chip unit and laser lift-off (LLO) technique removed by substrate.And, when channel layer 140 and the first conductive-type semiconductor layer 130 ohmic contact, because electric current can flow through channel layer 140, can light be produced in vertically overlapping with channel layer 140 active layer 120.Therefore, the luminous efficiency of luminescent device 100 can be improved further.Such as, when the first conductive-type semiconductor layer 130 is p-type semiconductor layer, channel layer 140 can be formed by the metal of such as Ti, Ni and W etc., and it and p-type semiconductor form ohmic contact, but it is not limited thereto.
Ray structure 135 can be arranged on ohmic contact layer 150 and channel layer 140.
Ray structure 135 has lateral surface that is vertical by isolation etching (isolation etching) technique or that be formed obliquely, and in this isolation etch process, multiple chip is divided into independent chip unit.And a part for the top surface of channel layer 140 can be exposed.
Ray structure 135 can be formed by multiple Group III-V compound semiconductor material.
Ray structure 135 can comprise: the first conductive-type semiconductor layer 130, be positioned at the active layer 120 on this first conductive-type semiconductor layer 130 and be positioned at the second conductive-type semiconductor layer 110 on this active layer 120.
First conductive-type semiconductor layer 130 can be arranged on a part of region of channel layer 140, ohmic contact layer 150 and CBL 145.First conductive-type semiconductor layer 130 can be the p-type semiconductor layer doped with p-type alloy.This p-type semiconductor layer can by least one in Group III-V compound semiconductor material, such as by select in the group formed from following item at least one and formed: GaN, AlN, AlGaN, InGaN, InN, InAlGaN, AlInN, AlGaAs, GaP, GaAs, GaAsP and AlGaInP.Described p-type alloy can be one of Mg, Zn, Ga, Sr and Ba.First conductive-type semiconductor layer 130 can have single or multiple lift structure, but it is not limited thereto.
First conductive-type semiconductor layer 130 can provide multiple charge carrier to active layer 120.
Active layer 120 can be arranged on the first conductive-type semiconductor layer 130.Active layer 120 can have at least one in following structure: single quantum, Multiple Quantum Well (MQW) structure, quantum wire structure and quantum-dot structure, but it is not limited thereto.
By using Group III-V compound semiconductor material, active layer 120 can be formed with in the mode of well layer and barrier layer alternate cycles.GaN, InGaN and AlGaN can be used as the component semi-conducting material being formed with active layer 120.Therefore, it is possible to be formed with active layer 120 in the mode of InGaN well layer/GaN barrier layer, InGaN well layer/AlGaN barrier layer or InGaN well layer/InGaN barrier layer alternate cycles, but it is not limited thereto.
Compound can be carried out in the multiple hole provided from the first conductive-type semiconductor layer 130 and the multiple electronics provided from the second conductive-type semiconductor layer 110 by active layer 120, to produce following light, the wavelength of this light is corresponding with the band gap of the semi-conducting material depending on active layer 120.
Although not shown, above active layer 120 and/or below can be provided with conductive coating.This conductive coating can be formed by AlGaN base semiconductor.Such as, the p-type coating layer being doped with p-type alloy can be provided with between the first conductive-type semiconductor layer 130 and active layer 120.And, the N-shaped coating layer being doped with N-shaped alloy can be provided with between active layer 120 and the second conductive-type semiconductor layer 110.
This conductive coating can be used as stop-layer (stopper), and by this stop-layer, the multiple hole supplied from active layer 120 and electronics are not transferred to the first conductive-type semiconductor layer 130 and the second conductive-type semiconductor layer 110.Therefore, by this conductive coating, the hole from active layer 120 supply and electronics further compound each other can be made, thus improve the luminous efficiency of luminescent device 100.
Active layer 120 can be arranged on below the second conductive-type semiconductor layer 110.Second conductive-type semiconductor layer 110 can be the n-type semiconductor layer doped with N-shaped alloy.Second conductive-type semiconductor layer 110 can by least one in Group III-V compound semiconductor material, such as by select in the group formed from following item at least one and formed: GaN, AlN, AlGaN, InGaN, InN, InAlGaN, AlInN, AlGaAs, GaP, GaAs, GaAsP and AlGaInP.Described N-type dopant can be one of Si, Ge, Sn, Se and Te.Second conductive-type semiconductor layer 110 can have single or multiple lift structure, but it is not limited thereto.
Second conductive-type semiconductor layer 110 can be provided with roughness or uneven portion 112, to improve luminous efficiency.This roughness or uneven portion 112 can have the random pattern shape formed by wet etching process, or have the periodic pattern shape similar with the photon crystal structure formed by Patternized technique, but it is not limited thereto.
Roughness or uneven portion 112 periodically can have concave shape and protrude shape.This concave shape and each protrusion in shape all can have a rounded surfaces, or have two inclined surfaces intersected at its summit place.
N-type semiconductor layer can be provided with below the first conductive-type semiconductor layer 130.Because the first conductive-type semiconductor layer 130 is p-type semiconductor layer and the second conductive-type semiconductor layer 110 is n-type semiconductor layer, so this ray structure can have at least one in following structure: N-P junction structure, P-N junction structure, N-P-N junction structure and P-N-P junction structure.
Second electrode 115 can be arranged on the top surface of ray structure 135.Second electrode 115 can comprise current expansion pattern 116b, this current expansion pattern 116b is by carrying out extend current, so that uniform current is fed to the whole region of ray structure 135 and the electrode pad region 116a with wire bond from electrode pad (electrode pad) region 116a at least side, side or more branch.
Electrode pad region 116a can have square, circular, oval or polygonal shape, but it is not limited thereto.
Second electrode 115 can have single or multiple lift structure, and it comprises at least one that select from the group be made up of following item: Au, Ti, Ni, Cu, Al, Cr, Ag and Pt.And the second electrode 115 can have the thickness h of about 1 μm to about 10 μm, especially about 2 μm to about 5 μm.
The example of the sandwich construction of the second electrode 115 can comprise: ohm layer, and this ohm layer is formed by the metal of such as Cr, is arranged in ground floor (lowermost layer), there is ohmic contact with ray structure 135; Reflector, this reflector is arranged in the setting second layer on the first layer, is formed, and have high reflecting properties by the metal of such as Al or Ag etc.; First diffusion impervious layer, this first diffusion impervious layer is arranged in setting third layer on the second layer, is formed by the metal of such as Ni, for preventing inter-level diffusion (interlayer diffusion); Conductive layer; This conductive layer is arranged in the 4th layer of being arranged in third layer, is formed and have high conductivity by the metal of such as Cu; Second diffusion impervious layer, this second diffusion impervious layer is arranged in the layer 5 be arranged on the 4th layer, is formed by the metal of such as Ni, for preventing inter-level diffusion; And adhesion layer, this adhesion layer is formed by the metal of such as Au or Ti with high adhesion etc., and to be easy to combined leads, but it is not limited thereto.
And electrode pad region 116a and current expansion pattern 116b can have identical stacked structure or have stacked structure different from each other.Such as, because current expansion pattern 116b there is no need for the adhesion layer of wire bond, so this adhesion layer can not be provided.And current expansion pattern 116b can be formed by the material with transmittance and conductivity, such as, at least one selection from the group be made up of following item is comprised: ITO, IZO, IZTO, IAZO, IGZO, IGTO, AZO, ATO and ZnO.
When roughness or uneven portion 112 are arranged on the top surface of ray structure 135, due to this roughness or uneven portion 112, nature can arrange the same or analogous roughness of shape in its shape and roughness or uneven portion 112 or uneven portion on the top surface of the second electrode 115.The roughness of the second electrode 115 or uneven portion can allow reflecting member 190 (will describe after a while) to be connected to the second electrode 115 securely.
Reflecting member 190 can be arranged at least one lateral surface of the second electrode 115.
Because the lateral surface of the second electrode 115 has vertical surface, so the lateral surface being arranged on the reflecting member 190 in the lateral surface of the second electrode 115 also can have vertical surface same or analogous with the vertical surface of the second electrode 115.
Reflecting member 190 can make following phenomenon minimum: namely, and the light extracted by the top surface of ray structure 135 is absorbed by the lateral surface of the second electrode 115.Particularly, because the second electrode 115 has the thicker degree of about 1 μm to about 10 μm, especially about 2 μm to about 5 μm, so from the viewpoint of light extraction efficiency, in the light extracted at the top surface by ray structure 135, the light quantity be absorbed in the lateral surface of the second electrode 115 is certainly very important.Therefore, owing to being provided with the reflecting member 190 that at least can reflect whole light from the lateral surface of the second electrode 115, so the light extraction efficiency of luminescent device 100 can be significantly improved.
According to its manufacturing process, reflecting member 190 can have the thickness of about 1 μm to about 10 μm.When reflecting member 190 has the thickness being less than about 1 μm, the thickness of reflecting member 190 becomes too thin and reduces reflecting properties.Therefore, light still can be absorbed in the second electrode 115 via reflecting member 190.When reflecting member 190 has the thickness being greater than about 10 μm, the thickness of reflecting member 190 becomes too thick and decreases the light extraction area of ray structure 135.Therefore, light extraction efficiency may decline.Such as, reflecting member 190 can be formed by the alloy of at least one in following metal or two or more metals: Ag, Ni, Al, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au and Hf.
Fig. 3 illustrates that the difference according to the second electrode in the luminescent device of the first embodiment and reflecting member forms the enlarged drawing of structure.
With reference to figure 3 (a), on the whole region that reflecting member 190 can be arranged on the lateral surface of the second electrode 115, especially electrode pad region 116a and on the neighboring area of top surface.And reflecting member 190 can extend to and contact with the top surface of the second conductive-type semiconductor layer 110.By being arranged on roughness on the top surface of the second electrode 115 or uneven portion 112, can be formed on the top surface of reflecting member 190 and the same or analogous roughness of roughness or uneven portion 112 be arranged on the top surface of the second electrode 115 or uneven portion 112, but it is not limited thereto.
With reference to figure 3 (b), on the whole region that reflecting member 190 can be arranged on the lateral surface of the second electrode 115, especially electrode pad region 116a and on the neighboring area of top surface.And reflecting member 190 can extend to and contact with the top surface of the second conductive-type semiconductor layer 110.At reflecting member 190 and the second electrode 115, especially and between the 116a of electrode pad region can be provided with adhesion layer 195, to improve the bonding force between them.Adhesion layer 195 can by such as Ni, Pt or Ti etc., the metal material with excellent adhesion formed.
With reference to figure 3 (c), in the part that reflecting member 190 can be arranged on the second electrode 115, the especially lateral surface of electrode pad region 116a and on the neighboring area of top surface.And reflecting member 190 can not contact the top surface of the second conductive-type semiconductor layer 110.That is, reflecting member 190 can extend to a part for the lateral surface of the second electrode 115 from the neighboring area of the top surface of electrode pad region 116a.This part of the lateral surface of electrode pad region 116a can be spaced apart with the top surface of the second conductive-type semiconductor layer 110.In the technique forming this reflecting member 190, the formation structure of reflecting member 190 can be produced by the mask be arranged on the second conductive-type semiconductor layer 110.
Reflecting member 190 can be arranged so that a part for the top surface of electrode pad region 116a is exposed.That is, a part for the top surface of electrode pad region 116a can not be covered by reflecting member 190.That is, be incorporated in the region of electrode pad region 116a at lead-in wire, this reflecting member can not be arranged.
Refer again to Fig. 1 and Fig. 2, at least can be formed with passivation layer 180 in the lateral surface of ray structure 135.Especially, one end of passivation layer 180 can be formed on the neighboring area of the top surface of the second conductive-type semiconductor layer 110, and the other end can via or through ray structure 135 lateral surface and be formed on the top surface of channel layer 140, but it is not limited thereto.That is, passivation layer 180 can from the top surface of channel layer 140, the neighboring area extending to the top surface of the second conductive-type semiconductor layer 110 via the lateral surface of the first conductive-type semiconductor layer 130, active layer 120 and the second conductive-type semiconductor layer 110.
Passivation layer 180 can prevent from occurring electric short circuit between ray structure 135 and the conductive member of such as outer electrode.Such as, passivation layer 180 can by such as SiO 2, SiO x, SiO xn y, Si 3n 4, TiO 2, or Al 2o 3deng the material with insulating properties formed, but it is not limited thereto.
Hereinafter, the method according to the manufacture luminescent device of an embodiment will be described in detail.But, with aforementioned, the explanation repeated is described omitting or describing simply.
Fig. 4 to Figure 14 is the view of the technique of the manufacture luminescent device illustrated according to the first embodiment.
With reference to figure 4, ray structure 135 can be formed on the substrate 101.
Such as, substrate 101 can comprise at least one that select from the group be made up of following item: sapphire (Al 2o 3), SiC, GaAs, GaN, ZnO, Si, GaP, InP and Ge, but it is not limited thereto.
Second conductive-type semiconductor layer 110, active layer 120 and the first conductive-type semiconductor layer 130 can be grown on the substrate 101, in order to form ray structure 135.
Such as, the at least one in following technique can be used to form ray structure 135: metal organic chemical vapor deposition (MOCVD) technique, chemical vapour deposition (CVD) (CVD) technique, plasma enhanced chemical vapor deposition (PECVD) technique, molecular beam epitaxy (MBE) technique and hydride gas-phase epitaxy (HVPE), but it is not limited thereto.
Resilient coating (not shown) or unadulterated semiconductor layer (not shown) can be formed with, to reduce the differences between lattice constant between them between ray structure 135 and substrate 101.
This resilient coating can comprise at least one that select from the group be made up of following item: InAlGaN, GaN, AlGaN, InGaN, AlInN, AlN or InN, but it is not limited thereto.
With reference to figure 5, on ray structure 135, especially the first conductive-type semiconductor layer 130, channel layer 140 can be formed around at chip boundary region (that is, the borderline region between the first chip area T1 and the second chip area T2).After a while, the first chip area T1 and the second chip area T2 is cut, with manufacturer's luminescent device by scribing process.Therefore, each chip area T1 and T2 all can be restricted to the region for obtaining unit luminescent device.
Around the borderline region that mask pattern can be used to be formed in by channel layer 140 between first chip area T1 and the second chip area T2.Because this figure illustrates with two dimension, so Fig. 5 shows following structure: channel layer 140 is formed in around any one chip area, and be formed in around the whole borderline region between all chip areas contacting this chip area.Therefore, when observing from upside, channel layer 140 can have annular shape, loop shape or frame shape.Various depositing operation can be used to form channel layer 140, such as sputtering technology, electron-beam deposition methods and plasma enhanced chemical vapor deposition (PECVD) technique.
Channel layer 140 can by such as SiO 2, Si xo y, Si 3n 4, Si xn y, SiO xn y, Al 2o 3or TiO 2deng the material with insulating properties formed, or to be formed by the metal material with excellent adhesion of such as Ti, Ni, Pt, Pd, Rh, Ir or W etc.Therefore, channel layer 140 can prevent from occurring electric short circuit between ray structure 135 and the first electrode 175, or can strengthen the bonding force between ray structure 135 and adhesion layer 170, thus improves the reliability of luminescent device 100.
With reference to figure 6, the first conductive-type semiconductor layer 130 can form current barrier layer (CBL) 145.Mask pattern can be used to form this CBL 145.CBL 145 can be formed on the first conductive-type semiconductor layer 130, and wherein, it is vertically overlapping with the second electrode 115 will formed by subsequent technique at least partially.
With reference to figure 7 and Fig. 8, on the top surface of channel layer 140 and a part for lateral surface and on the top surface of the first conductive-type semiconductor layer 130 and CBL 145, ohmic contact layer 150 can be formed.Ohmic contact layer 150 can form reflector 160.
Ohmic contact layer 150 can be formed by one that selects from transparent conductive material and aforementioned metal.Such as, this ohmic contact layer can have single or multiple lift structure, its by use select from the group be made up of following item at least one and formed: indium tin oxide (ITO), indium-zinc oxide (IZO), indium zinc tin oxide (IZTO), indium aluminium zinc oxide (IAZO), indium gallium zinc oxide (IGZO), indium gallium tin-oxide (IGTO), aluminium zinc oxide (AZO), antimony tin oxide (ATO), gallium zinc oxide (GZO), IrOx, RuOx, RuOx/ITO, Ni, Ag, Ni/IrOx/Au, and Ni/IrOx/Au/ITO.
Such as, each in ohmic contact layer 150 and reflector 160 all can utilize in following technique any one formed: sputtering technology, electron-beam deposition methods and plasma enhanced chemical vapor deposition (PECVD) technique.
With reference to figure 9, adhesion layer 170 can be formed on reflector 160 and channel layer 140, and the first electrode 175 can be formed on this adhesion layer 170.
First electrode 175 can use electroplating technology or depositing operation and be formed, but it is not limited thereto.
Combined process can be used prepare the separating plate being adhered to adhesion layer 170, thus form the first electrode 175.
With reference to Figure 11, (180 °) this substrate 101 can be overturn downwards, then, substrate 101 can be removed.
Substrate 101 removes by least one in following method: laser lift-off (LLO) method, chemical stripping (CLO) method and physics finishing method.
By described LLO method, laser by cover to the interface between substrate 101 and the second conductive-type semiconductor layer 110, so that substrate 101 is separated with the second conductive-type semiconductor layer 110.
According to described LLO method, substrate 101 is removed, thus uses wet etching process that the second conductive-type semiconductor layer 110 is exposed.
According to described physics finishing method, substrate 101, by physics polishing, to remove substrate 101 in order from its top surface, thus makes the second conductive-type semiconductor layer 110 expose.
After substrate 101 is removed, cleaning procedure can be performed further, to remove the residue on the top surface remaining in the second conductive-type semiconductor layer 110 of substrate 101.This cleaning procedure can comprise cineration technics (ashing process), and it uses plasma surface treatment or oxygen or nitrogen.
With reference to Figure 11, isolation etch process can be performed along the borderline region between the first chip area T1 and the second chip area T2, to divide the unit die area comprising ray structure 135.By this isolation etch process, the channel layer 140 in the borderline region between the first chip area T1 and the second chip area T2 can be made to expose.
Such as, this isolation etch process can be performed by the dry method etch technology of such as inductively coupled plasma (ICP) technique etc.
With reference to Figure 12, can in the borderline region between the first chip area T1 and the second chip area T2, at least form passivation layer 180 in the lateral surface of ray structure 135 and on channel layer 140.That is, passivation layer 180 can contact with the top surface of the channel layer 140 in the borderline region between the first chip area T1 and the second chip area T2.And, passivation layer 180 can via or extend to the neighboring area of the top surface of the second conductive-type semiconductor layer 110 through the lateral surface of the first conductive-type semiconductor layer 130, active layer 120 and the second conductive-type semiconductor layer 110.
Passivation layer 180 can be formed by the depositing operation of such as electron-beam deposition methods, pecvd process or sputtering technology etc.
The top surface not being passivated layer 180 covering of the second conductive-type semiconductor layer 110 can form roughness or uneven portion 112, to improve light extraction efficiency.
Passivation layer 180 can be used as mask to perform dry method or wet etching process, to form this roughness or uneven portion 112.Due to this passivation layer 180, the part being positioned at below passivation layer 180 of the second conductive-type semiconductor layer 110 does not form any roughness or uneven portion.
Although just carry out the technique forming roughness or uneven portion on the second conductive-type semiconductor layer 110 in fig. 12, after formation passivation layer 180, before also can forming passivation layer 180, first on the second conductive-type semiconductor layer 110, form roughness or uneven portion.In this case, this roughness or uneven portion can be formed in the second conductive-type semiconductor layer 110, active layer 120 and the first conductive-type semiconductor layer 130 whole lateral surface on and the second conductive-type semiconductor layer 110 top surface on.
These embodiments be not limited to for formed roughness or uneven portion 112 (it is formed on the second conductive-type semiconductor layer 110) and passivation layer 180 to definite sequence.
The second conductive-type semiconductor layer 110 comprising roughness or uneven portion 112 can form the second electrode.
Second electrode 115 can comprise: electrode pad region 116a, and lead-in wire is incorporated into this electrode pad region 116a; And current expansion pattern 116b, this current expansion pattern 116b are by carrying out extend current from electrode pad region 116a at least side, side or more branch, so that uniform current is fed to the whole region of ray structure 135.
Second electrode 115 can have single or multiple lift structure, and it comprises at least one that select from the group be made up of following item: Au, Ti, Ni, Cu, Al, Cr, Ag and Pt.
Electroplating technology or depositing operation can be used to form the second electrode 115.
With reference to Figure 13, at least reflecting member 190 can be formed in the lateral surface of the second electrode 115.
On the whole region that reflecting member 190 can be formed in the lateral surface of the second electrode 115, especially electrode pad region 116a and on the neighboring area of top surface.
Such as, reflecting member 190 can be formed by the alloy of at least one in following metal or two or more metals: Ag, Ni, Al, Rh, Pd, Ir, Ru, Mg, Zn, Pt, Au and Hf.
Reflecting member 190 can be formed by the depositing operation of such as electron-beam deposition methods, pecvd process or sputtering technology etc., or passes through electroplating technology and formed.
After ray structure 135 forms mask, this reflecting member 190 can be formed.In this case, the technique owing to manufacturing this reflecting member 190 can be prevented and damage ray structure 135.
And, when being formed with adhesion layer 195 between reflecting member 190 and the second electrode 115 (see Fig. 3 (b)), before formation reflecting member 190, adhesion layer 195 can be formed at least one lateral surface of the second electrode 115.
With reference to Figure 14, chip separation process can be performed, to cut the borderline region between the first chip area Tlyu second chip area T2.As a result, because multiple chip is divided into independent chip unit, so the luminescent device 100 according to embodiment can be produced.
Such as, this chip separation process can comprise: cut off technique, in the process, is applied through and uses blade and the physical force that produces carrys out separating chips; Laser scribe process, in the process, separating chips is carried out on the border be irradiated to by laser between chip; And comprise the etch process of dry etching or wet etching process, but it is not limited thereto.
Figure 15 is the side cross-sectional, view of the luminescent device according to the second embodiment, and Figure 16 is the plane graph of the luminescent device that Figure 15 is shown.
Except following difference, the second embodiment and the first embodiment same or similar: the whole surface at least in the lateral surface of the electrode pad region 116a of the second electrode 115 and except the basal surface of the current expansion pattern 116b except the second electrode 115 of current expansion pattern 116b is furnished with reflecting member 190.
Therefore, the equal parts of the second embodiment is endowed the term identical with the first embodiment or Reference numeral.
In addition, in a second embodiment, the content identical with the first embodiment will be not described in detail.According to the first embodiment, these contents do not described in a second embodiment easily can be understood.
With reference to Figure 15 and Figure 16, according in the luminescent device 100A of the second embodiment, on the whole surface in the lateral surface that reflecting member 190 at least can be arranged in the electrode pad region 116a of the second electrode 115 and except the basal surface of the current expansion pattern 116b except the second electrode 115 of current expansion pattern 116b.
In other words, reflecting member 190 can cover top surface and two lateral surface of current expansion pattern 116b.
According to the second embodiment, reflecting member 190 can be arranged in further current expansion pattern 116b, on whole surface except the basal surface of this current expansion pattern 116b.Therefore, reflecting member 190 due to the lateral surface place being at least arranged in current expansion pattern 116b is reflected through the light that the second conductive-type semiconductor layer 110 extracts completely, so compared with the first embodiment, light loss can be made minimum, and can light extraction efficiency be improved.
Figure 17 is the side cross-sectional, view of the luminescent device according to the 3rd embodiment.
Except following difference, 3rd embodiment and the first embodiment same or similar: the second electrode 115 has the lateral surface of inclination, and the reflecting member 190 be arranged in the lateral surface of the second electrode 115 is also in tilted layout in the lateral surface of the second electrode 115.
Therefore, the equal parts of the 3rd embodiment is endowed the term identical with the first embodiment or Reference numeral.
In addition, in the third embodiment, the content identical with the first embodiment will be not described in detail.According to the first embodiment, these contents do not described in the third embodiment easily can be understood.
With reference to Figure 17, according in the luminescent device 100B of the 3rd embodiment, the second electrode 115 can have the lateral surface of inclination.That is, the second electrode 115 can have as bottom face, and the width of this basal surface is greater than the width of the top surface of the second electrode 115.
Similarly, because the second electrode 115 has the lateral surface of inclination, so the reflecting member 190 be arranged in the lateral surface of the second electrode 115 also can have the same or analogous inclined surface of inclined surface with the second electrode 115.
In addition, similar with the first embodiment, reflecting member 190 can be arranged around the neighboring area of the top surface of the second electrode 115.And reflecting member 190 can contact the second conductive-type semiconductor layer 110 or can separate with the second conductive-type semiconductor layer 110.
Therefore, because reflecting member 190 has the lateral surface of inclination, so the inclined surface of reflecting member 190 can be reflected through the light that the second conductive-type semiconductor layer 110 extracts, to improve light extraction efficiency.
Figure 18 is the side cross-sectional, view of the luminescent device according to the 4th embodiment.
Except being furnished with except roughness or uneven portion in each lateral surface of the second electrode 115 and reflecting member 190, the 4th embodiment and the 3rd embodiment same or similar.
Therefore, the equal parts of the 4th embodiment is endowed the term identical with the 3rd embodiment or Reference numeral.
In addition, in the fourth embodiment, the content identical with the first embodiment and the 3rd embodiment will be not described in detail.According to first and the 3rd embodiment, these contents do not described in the fourth embodiment easily can be understood.
With reference to Figure 18, according in the luminescent device 100C of the 4th embodiment, the second electrode 115 can have the lateral surface of inclination.And described roughness or uneven portion can be arranged in each in the top surface of the second electrode 115 and lateral surface.
Second electrode 115 can have as bottom face: the width of this basal surface is greater than the width of the top surface of the second electrode 115.
In addition, the second electrode 115 can have the lateral surface of inclination, and described roughness or uneven portion also can be arranged in the lateral surface of the inclination of the second electrode 115.
Similarly, because the second electrode 115 has the lateral surface of inclination, and described roughness or uneven portion are arranged in the lateral surface of the inclination of the second electrode 115, so the reflecting member 190 be arranged in the lateral surface of the second electrode 115 also can have and the same or analogous roughness of the roughness of the second electrode 115 or uneven portion or uneven portion.
Therefore, because reflecting member 190 has the lateral surface of inclination, so the inclined surface of reflecting member 190 can be reflected through the light that the second conductive-type semiconductor layer 110 extracts, to improve light extraction efficiency.And, because described roughness or uneven portion can be arranged in the lateral surface of reflecting member 190, so this roughness of reflecting member 190 or uneven portion can be reflected through the light that the second conductive-type semiconductor layer 110 extracts randomly.As a result, light can advance equably, to improve optical uniformity on all directions of ray structure 135.
Figure 19 be according to an embodiment comprise luminescent device, the sectional view of light emitting device package.
With reference to Figure 19, the light emitting device package 30 according to this embodiment comprises: main part 20; First electrode layer 31 and the second electrode lay 32, this first electrode layer 31 and the second electrode lay 32 are arranged on main part 20; Luminescent device 100, this luminescent device 100 to be arranged on main part 20 and to be electrically connected to the first electrode layer 31 and the second electrode lay 32; And shaped component 40, this shaped component 40 surrounds the luminescent device 100 on main part 20.
Main part 20 can be formed by silicon materials, synthetic resin material or metal material.And, when viewed from the top, there is in main part 20 cavity 50, and this cavity 50 has inclined surface 53.
First electrode layer 31 and the second electrode lay 32 can be electrically isolated from one another, and pass from the inside of main part 20.That is, one end of each first electrode layer 31 and the second electrode lay 32 is arranged in cavity 50 inside, and the other end is attached to the outer surface of main part 20 and is exposed to outside.
Electric power can be provided to luminescent device 100 by the first electrode layer 31 and the second electrode lay 32.And the first electrode layer 31 and the second electrode lay 32 can be reflected in the light produced in luminescent device 100, to improve optical efficiency.In addition, the heat produced in luminescent device 100 can be discharged to the outside by the first electrode layer 31 and the second electrode lay 32.
Luminescent device 100 can be arranged on main part 20, or is arranged on the first electrode layer 31 or the second electrode lay 32.
First lead-in wire 171 of luminescent device 100 and the second lead-in wire 181 can be electrically connected to one in the first electrode layer 31 and the second electrode lay 32, but it is not limited thereto.
Shaped component 40 can surround luminescent device 100 to protect luminescent device 100.And, can phosphor be comprised in shaped component 40, to change the wavelength of the light launched from luminescent device 100.
Lamp unit can be applied to according to the luminescent device of embodiment or light emitting device package.This lamp unit has following structure: wherein, and multiple luminescent device or light emitting device package line up array.Therefore, this lamp unit can comprise the lighting device shown in the display unit shown in Figure 20 and Figure 21 and Figure 22.In addition, this lamp unit can comprise illuminating lamp, traffic lights, headlight for vehicle and Sign Board.
Figure 20 is the decomposition diagram of the display unit according to an embodiment.
With reference to Figure 20, display unit 1000 can comprise: light guide plate 1041; Light emitting module 1031, this light emitting module 1031 is for being supplied to light guide plate 1041 by light; Reflecting member 1022, this reflecting member 1022 is positioned at below light guide plate 1041; Optical sheet 1051, this optical sheet 1051 is positioned at above light guide plate 1041; Display floater 1061, this display floater 1061 is positioned at above optical sheet 1051; And bottom 1011, this bottom 1011 holds light guide plate 1041, light emitting module 1031 and reflecting member 1022, but it is not limited thereto.
Bottom 1011, reflector plate 1022, light guide plate 1041 can be defined as lamp unit 1050.
The light that light guide plate 1041 diffusion is supplied from light emitting module 1031, to produce planar light.Light guide plate 1041 can be formed by transparent material.Such as, light guide plate 1041 can be formed by one of following material: the allyl resin material of such as polymethyl methacrylate (PMMA), polyethylene terephthalate (PET) resin, Merlon (PC) resin, cyclic olefin copolymer (COC) resin and PEN (PEN) resin.
Light emitting module 1031 is arranged at least one lateral surface of light guide plate 1041, light to be supplied at least one lateral surface of light guide plate 1041.Therefore, light emitting module 1031 can be used as the light source of display unit.
At least one light emitting module 1031 can be arranged in a lateral surface of light guide plate 1041, directly or indirectly to provide light.Light emitting module 1031 can comprise light emitting device package 30 according to this embodiment and substrate 1033.Light emitting device package 30 can be arranged on substrate 1033 within a predetermined distance.Substrate 1033 can be printed circuit board (PCB), but it is not limited thereto.And substrate 1033 is to comprise metal-cored PCB or flexible PCB, but it is not limited thereto.When in the lateral surface that light emitting device package 30 is arranged on bottom 1011 or on absorber plate, substrate 1033 can be removed.Here, a part for this absorber plate can contact the top surface of bottom 1011.Therefore, the heat produced in light emitting device package 30 can be discharged in bottom 1011 via this absorber plate.
Can be provided with multiple light emitting device package 30, to allow light exit surface (light is launched on substrate 1033 by this light exit surface) and light guide plate 1041 to separate one section of preset distance, but it is not limited thereto.Light directly or indirectly can be supplied to light incident surface (this light incident surface is a side of light guide plate 1041) by light emitting device package 30, but it is not limited thereto.
Reflecting member 1022 can be arranged in below light guide plate 1041.Because to the light incided on the basal surface of light guide plate 1041, reflecting member 1022 reflects that light is supplied to display floater 1061, so the brightness of display floater 1061 can be improved.Such as, reflecting member 1022 can be formed by PET, PC and PVC, but it is not limited thereto.Reflecting member 1022 can be the top surface of bottom 1011, but it is not limited thereto.
Bottom 1011 can hold light guide plate 1041, light emitting module 1031 and reflecting member 1022.For this reason, bottom 1011 can comprise accommodation section 1012, and this accommodation section 1012 has the box form of upwards side opening, but it is not limited thereto.Bottom 1011 can be connected to top cover (not shown), but it is not limited thereto.
Bottom 1011 can be formed by metal material or resin material.And, die press technology for forming or extruding-out process can be used to manufacture bottom 1011.Bottom 1011 can be formed by the metal or nonmetallic materials with excellent heat conductivity, but it is not limited thereto.
Such as, display floater 1061 can be liquid crystal display (LCD) panel, and comprises the first substrate and second substrate that are formed by transparent material and the liquid crystal layer between this first substrate and second substrate.At least one of display floater 1061 can be attached with polarization plates on the surface.The disclosure is not limited to this attachment structure of polarization plates.Display floater 1061 transmits or stops the light provided by light emitting module 1031, to show information.Display unit 1000 can be applicable to various portable terminal, the monitor of notebook computer, the monitor, television set etc. of laptop computer.
Optical sheet 1051 can be arranged between display floater 1061 and light guide plate 1041, and comprises at least one transmission sheet.Such as, optical sheet 1051 can comprise at least one in following item: diffusion disk, horizontal or vertical prismatic lens and brightness enhancement sheet etc.Diffusion disk diffuse incident light, and level and/or vertically prismatic lens make incident light concentrate on the display region.In addition, brightness enhancement sheet re-uses the light lost, to improve brightness.And screening glass can be arranged on display floater 1061, but it is not limited thereto.
Such as the optical component of light guide plate 1041 and optical sheet 1051 etc. can be arranged in the light path of light emitting module 1031, but it is not limited thereto.
Figure 21 is the view of the display unit illustrated according to an embodiment.
With reference to Figure 21, display unit 1100 comprises: bottom 1152, the substrate 1120 it being arranged with above-mentioned light emitting device package 30, optical component 1154 and display floater 1155.
Substrate 1120 and light emitting device package 30 can be defined as light emitting module 1060.Bottom 1152, at least one light emitting module 1060 and optical component 1154 can be defined as a luminescence unit.
Bottom 1152 can comprise accommodation section 1153, but it is not limited thereto.
Optical component 1154 can comprise at least one in following item: lens, light guide plate, diffusion disk, level and vertical prismatic lens and brightness enhancement sheet.This light guide plate can be formed by PC material or PMMA material.In this case, this light guide plate can be removed.Diffusion disk diffuse incident light, level and vertical prismatic lens make incident light concentrate on display floater 1155, and brightness enhancement sheet re-uses the light lost, to improve brightness.
Optical component 1154 is arranged in above light emitting module 1060, and to use the light launched by light emitting module 1060 to produce planar light, or the light launched by light emitting module 1060 is also collected in diffusion.
Figure 22 is the perspective view of the lighting device according to an embodiment.
With reference to Figure 22, lighting unit 1500 comprises: shell 1510; Be arranged in the light emitting module 1530 of shell 1510; And splicing ear 1520, this splicing ear 1520 is arranged in shell 1510, to receive electric power from external power source.
Preferably, shell 1510 can be formed by the material with good heat shielding performance, such as, and metal material or resin material.
Light emitting module 1530 can comprise substrate 1532 and be arranged on the light emitting device package 30 on this substrate 1532.Can be provided with multiple light emitting device package 30, and described multiple light emitting device package 30 can with the shaped formation of matrix, or the one section of preset distance that is spaced from each other.
Substrate 1532 can be the insulator substrate being printed with circuit pattern thereon.Such as, this substrate can comprise common printed circuit board (PCB), metal-cored PCB, flexible PCB, ceramic PCB, FR-4 etc.
And substrate 1532 can by can the material of usable reflection light be formed, and can be formed as can the color of usable reflection light on its surface.Such as, this substrate can be the coating with white or silver color.
At least one light emitting device package 30 can be arranged on substrate 1532.Each light emitting device package 30 all can comprise at least one light-emitting diode (LED) chip.This LED chip can comprise the color LED of red-emitting, green glow, blue light or white light and launch the UV LED of ultraviolet (UV) ray.
Light emitting module 1530 can have the combination of several light emitting device package 30, to obtain desired color and brightness.Such as, light emitting module 1530 can have the combination of white light LEDs, red-light LED and green light LED, to obtain high color rendering index (CRI) (CRI).
Splicing ear 1520 can be electrically connected to light emitting module 1530, to supply electric power.Splicing ear 1520 can be threadedly coupled on the external power source of socket-type, but it is not limited thereto.Such as, splicing ear 1520 can be made the form of pin and be inserted in external power source, or can be connected by electrical wiring to external power source.
According to embodiment, in the method manufacturing this luminescent device, prepare the first electrode, and the ray structure comprising the first semiconductor layer, active layer and the second semiconductor layer is arranged on this first electrode.And, by the second arrangement of electrodes on described ray structure, and reflecting member is at least arranged in the lateral surface of the second electrode.
According to embodiment, because reflecting member is at least arranged in the lateral surface of the second electrode, so this reflecting member can be reflected through the light that described ray structure extracts, to improve the light extraction efficiency of this luminescent device.
According to embodiment, the second electrode comprises electrode pad region and current expansion pattern, and described current expansion pattern is from electrode pad region at least side, side or more branch.At this, because reflecting member is at least arranged in the lateral surface in electrode pad region, so this electrode pad region can be reflected through the light that described ray structure extracts, to improve the light extraction efficiency of this luminescent device.
According to embodiment, because adhesion layer is arranged between the second electrode and reflecting member, reflecting member adheres to the second electrode more firmly by this adhesion layer.
According to embodiment, because reflecting member is at least arranged in the lateral surface of each current expansion pattern, so electrode pad region and current expansion pattern can be reflected through the light that described ray structure extracts, to significantly improve light extraction efficiency.
According to embodiment, the lateral surface due to electrode has inclined surface and uneven portion, so by this uneven portion, can be reflected through the light that described ray structure extracts randomly, to realize evenly light.
Any quoting in this manual for " embodiment ", " embodiment ", " exemplary embodiment " etc. all means that special characteristic, structure or the characteristic described in conjunction with this embodiment is included at least one embodiment of the present invention.This kind of phrase occurred everywhere in this manual need not all represent same embodiment.In addition, when describing special characteristic, structure or characteristic in conjunction with any embodiment, think in conjunction with other embodiments in these embodiments to realize this feature, structure or characteristic also within the scope of the understanding of those skilled in the art.
Although describe embodiment with reference to multiple exemplary embodiment of the present invention, should be appreciated that those skilled in the art can visualize and will fall into many other amendment and embodiments in the spirit and scope of disclosure principle.Especially, in the scope of present disclosure, accompanying drawing and claims, the building block of subject combination arrangement and/or the variations and modifications of arrangement aspect are all possible.For a person skilled in the art, except the change of described building block and/or arrangement aspect and amendment, alternative purposes also will be apparent.
Light-emitting diode (LED) is a kind of semiconductor device converting electrical energy into light.Compare with the light source of incandescent lamp bulb etc. with the such as fluorescent lamp of prior art, LED tool has the following advantages: such as, low-power consumption, the semipermanent life-span, and the response time is fast, safety and environmental protection.In order to the light source of prior art is replaced with LED, carry out much research.And according to this trend, LED is used as the light source as lower device just day by day: the such as lighting device of various fluorescent tube and street lamp etc., the lighting unit of liquid crystal indicator and indoor and outdoors scoreboard.
Fig. 1 is the side cross-sectional, view of the luminescent device according to the first embodiment.
Fig. 2 is the plane graph of the luminescent device that Fig. 1 is shown.
Fig. 3 illustrates that the difference according to the reflecting member in the luminescent device of the first embodiment and the second electrode forms the enlarged drawing of structure.
Fig. 4 to Figure 14 is the view of the technique of this luminescent device of manufacture illustrated according to the first embodiment.
Figure 15 is the side cross-sectional, view of the luminescent device according to the second embodiment.
Figure 16 is the plane graph of the luminescent device that Figure 15 is shown.
Figure 21 is the view of the display unit according to an embodiment.
Ray structure, described ray structure comprises the first semiconductor layer, active layer and the second semiconductor layer that are positioned on described first electrode;
Second electrode, described second electrode is positioned on described ray structure; And
Reflecting member, described reflecting member is at least positioned in the lateral surface of described second electrode,
Wherein, described second electrode comprises: electrode pad region, and described electrode pad region is used for wire bond; And current expansion pattern, described current expansion pattern from described electrode pad region at least side, side or more branch,
Wherein, described reflecting member is at least arranged in the lateral surface in described electrode pad region, and
Wherein, described second semiconductor layer of described reflecting member contact, and the neighboring area extending to the top surface in described electrode pad region via the lateral surface in described electrode pad region.
2. luminescent device according to claim 1, also comprises adhesion layer, and described adhesion layer is between described second electrode and described reflecting member.
3. luminescent device according to claim 1, wherein, the lateral surface of described second electrode has vertical surface, and the lateral surface of described reflecting member has the vertical surface corresponding with the vertical surface of described second electrode.
4. luminescent device according to claim 3, wherein, the lateral surface of described second electrode has non-flat forms patterning, and the lateral surface of described reflecting member has the non-flat forms patterning corresponding with the non-flat forms patterning of described second electrode.
5. luminescent device according to claim 1, wherein, the lateral surface of described second electrode has inclined surface, and the lateral surface of described reflecting member has the inclined surface corresponding with the inclined surface of described second electrode.
6. a luminescent device, comprising:
Wherein, described second electrode comprises: electrode pad region, and described electrode pad region is used for wire bond; And current expansion pattern, described current expansion pattern from described electrode pad region at least side, side or more branch, and
Wherein, described second semiconductor layer of described reflecting member contact, through each described current expansion pattern lateral surface and be arranged on the top surface of each described current expansion pattern.
7. luminescent device according to claim 6, wherein, the lateral surface of described second electrode has vertical surface, and the lateral surface of described reflecting member has the vertical surface corresponding with the vertical surface of described second electrode.
8. luminescent device according to claim 7, wherein, the lateral surface of described second electrode has non-flat forms patterning, and the lateral surface of described reflecting member has the non-flat forms patterning corresponding with the non-flat forms patterning of described second electrode.
9. luminescent device according to claim 6, wherein, the lateral surface of described second electrode has inclined surface, and the lateral surface of described reflecting member has the inclined surface corresponding with the inclined surface of described second electrode.
10. luminescent device according to claim 9, wherein, the lateral surface of described second electrode has non-flat forms patterning, and the lateral surface of described reflecting member has the non-flat forms patterning corresponding with the non-flat forms patterning of described second electrode.
11. luminescent devices according to claim 1, wherein, described electrode pad region and described current expansion pattern comprise multiple layer respectively.
12. luminescent devices according to claim 11, wherein, described electrode pad region and described current expansion pattern comprise layer different from each other respectively.
13. luminescent devices according to claim 1, wherein, described reflecting member has the thickness of 1 μm to 10 μm.
14. 1 kinds of luminescent devices, comprising:
Second electrode, described second electrode is positioned on described ray structure;
Reflecting member, described reflecting member is at least positioned in the lateral surface of described second electrode;
Between described first electrode and described ray structure with at least one in lower floor: reflector, ohmic contact layer and current barrier layer;
Channel layer, on the neighboring area of described channel layer between described first electrode and described ray structure; And
Passivation layer, described passivation layer contacts described channel layer, and described passivation layer at least extends towards the lateral surface of described ray structure.
15. luminescent devices according to claim 14, wherein, described second electrode comprises: electrode pad region; And current expansion pattern, described current expansion pattern from described electrode pad region at least side, side or more branch,
Wherein, described reflecting member is at least arranged in the lateral surface in described electrode pad region.
CN201010621716.5A 2010-03-10 2010-12-28 Luminescent device CN102194929B (en)
KR20100021289A KR101014155B1 (en) 2010-03-10 2010-03-10 Light emitting device, method for fabricating the light emitting device and light emitting device package
KR10-2010-0021289 2010-03-10
CN201410305809.5A CN104112801B (en) 2010-03-10 2010-12-28 Luminescent device
CN201410305809.5A Division CN104112801B (en) 2010-03-10 2010-12-28 Luminescent device
CN102194929A CN102194929A (en) 2011-09-21
CN102194929B true CN102194929B (en) 2015-08-12
ID=43777332
CN201010621716.5A CN102194929B (en) 2010-03-10 2010-12-28 Luminescent device
US (3) US8653547B2 (en)
EP (2) EP2372791B1 (en)
KR (1) KR101014155B1 (en)
CN (2) CN102194929B (en)
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