WO2006030734A1 - 半導体発光装置 - Google Patents
半導体発光装置 Download PDFInfo
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- WO2006030734A1 WO2006030734A1 PCT/JP2005/016752 JP2005016752W WO2006030734A1 WO 2006030734 A1 WO2006030734 A1 WO 2006030734A1 JP 2005016752 W JP2005016752 W JP 2005016752W WO 2006030734 A1 WO2006030734 A1 WO 2006030734A1
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- light emitting
- semiconductor
- layer
- light
- emitting device
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/58—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing copper, silver or gold
- C09K11/582—Chalcogenides
- C09K11/584—Chalcogenides with zinc or cadmium
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/64—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing aluminium
- C09K11/641—Chalcogenides
- C09K11/642—Chalcogenides with zinc or cadmium
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- C—CHEMISTRY; METALLURGY
- C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
- C09K—MATERIALS FOR MISCELLANEOUS APPLICATIONS, NOT PROVIDED FOR ELSEWHERE
- C09K11/00—Luminescent, e.g. electroluminescent, chemiluminescent materials
- C09K11/08—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials
- C09K11/77—Luminescent, e.g. electroluminescent, chemiluminescent materials containing inorganic luminescent materials containing rare earth metals
- C09K11/7701—Chalogenides
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L27/00—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate
- H01L27/15—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission
- H01L27/153—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission in a repetitive configuration, e.g. LED bars
- H01L27/156—Devices consisting of a plurality of semiconductor or other solid-state components formed in or on a common substrate including semiconductor components with at least one potential-jump barrier or surface barrier specially adapted for light emission in a repetitive configuration, e.g. LED bars two-dimensional arrays
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2224/00—Indexing scheme for arrangements for connecting or disconnecting semiconductor or solid-state bodies and methods related thereto as covered by H01L24/00
- H01L2224/01—Means for bonding being attached to, or being formed on, the surface to be connected, e.g. chip-to-package, die-attach, "first-level" interconnects; Manufacturing methods related thereto
- H01L2224/18—High density interconnect [HDI] connectors; Manufacturing methods related thereto
- H01L2224/23—Structure, shape, material or disposition of the high density interconnect connectors after the connecting process
- H01L2224/24—Structure, shape, material or disposition of the high density interconnect connectors after the connecting process of an individual high density interconnect connector
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/10—Details of semiconductor or other solid state devices to be connected
- H01L2924/11—Device type
- H01L2924/12—Passive devices, e.g. 2 terminal devices
- H01L2924/1204—Optical Diode
- H01L2924/12044—OLED
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/50—Wavelength conversion elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/52—Encapsulations
- H01L33/54—Encapsulations having a particular shape
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/48—Semiconductor devices with at least one potential-jump barrier or surface barrier specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof characterised by the semiconductor body packages
- H01L33/62—Arrangements for conducting electric current to or from the semiconductor body, e.g. lead-frames, wire-bonds or solder balls
Definitions
- a plurality of light emitting portions are formed on a substrate and connected in series and parallel, so that, for example, a commercial AC power supply with a voltage of 100V or the like is used instead of a lighting lamp or a fluorescent tube.
- the present invention relates to an AC-driven semiconductor light emitting device. More particularly, the present invention relates to a semiconductor light emitting device having a structure capable of preventing flickering of light emission based on AC driving.
- LEDs have been used as light sources for displays and signal devices, and LEDs have been used in place of electric lamps and fluorescent tubes.
- AC drive such as 100V.
- the LEDs are connected in series and connected to AC power supply 71.
- S represents a switch.
- the LED since the LED is a diode, it operates on only the half wave of alternating current, and to prevent flickering based on the fact that it does not operate on the remaining half wave, a phosphorescent paint is applied to the inner surface of the force bar for forming the lighting device. It has been proposed to apply and cover (see, for example, Patent Document 1).
- Patent Document 1 Japanese Patent Laid-Open No. 10-083701
- the LED when an LED is driven with an alternating current, the LED operates and emits light when the forward voltage is applied to the LED, but does not operate and emit light when the reverse voltage is applied. .
- the LEDs connected in antiparallel every half wave can be operated alternately, but each operates independently and the applied voltage is 0. Therefore, light emission is intermittently performed.
- the cycle of this light emission is 50 or 60 Hz under normal commercial power, so it has twice the repetition frequency, and it is flickering for force-sensitive eyes that are not too much of an eye for human eyes. Become.
- the present invention has been made to solve such a problem, and even if AC driving is performed, flickering of illumination can be extinguished with almost no sense of incongruity if the squeezing force switch is turned off.
- the semiconductor light-emitting device itself is treated to prevent flickering, and it has a structure that prevents flickering without applying any special treatment to the lighting device, no matter what state the semiconductor light-emitting device is installed in the lighting device.
- An object is to provide a semiconductor light emitting device.
- Another object of the present invention is to maintain the brightness for a long time in the semiconductor light emitting device itself regardless of the container or the like even when the switch is turned off, such as a guide light or emergency lighting in the event of a power failure.
- the object is to provide a semiconductor light-emitting device capable of achieving S.
- a semiconductor light emitting device includes a substrate and a semiconductor layer laminated to form a light emitting layer on the substrate to form a semiconductor laminated portion, and the semiconductor laminated portion is electrically connected to a plurality of semiconductor laminated portions. And a plurality of light emitting portions each provided with a pair of electrodes, and a wiring film connected to the electrodes to connect the plurality of light emitting portions in series and Z or in parallel, respectively. And a phosphor layer containing a fluorescent material having an afterglow time of 10 milliseconds to 1 second is provided on the light emitting surface side of the plurality of light emitting sections.
- the afterglow time means the time from when voltage application to the light emitting part is turned off until the light emission intensity becomes about 1/10.
- the fluorescent material is, for example, doped with Cu doped ZnS, Y 2 O and A1
- It can be composed of at least one selected from the group of ZnS.
- An optical glass material is an inorganic material having a phosphorescent property such as terbium, for example, so that the time from when voltage application to the light emitting part is turned off until the light emission intensity reaches about ⁇ is 1 second or more. Means organic substances dispersed in the glass.
- a semiconductor laminated portion is formed by laminating a semiconductor layer so as to form a light emitting layer on the substrate, and a plurality of the semiconductor laminated portions are formed. And a plurality of light emitting portions each of which is provided with a pair of electrodes and connected to the electrodes to connect the plurality of light emitting portions in series and Z or in parallel, respectively. And a layer containing a phosphorescent glass material is provided on the light emitting surface side of the plurality of light emitting portions.
- the semiconductor multilayer portion is made of a nitride semiconductor, and at least on the light emitting surface side of the semiconductor multilayer portion, a light emission color conversion member that converts the wavelength of light emitted from the light emitting layer, and an afterglow time of 10 mm.
- a fluorescent material within 1 second to 1 second and at least one phosphorescent material with an afterglow time of 1 second or longer, it can be used as illumination by being formed to emit white light. However, it is possible to prevent flickering and to emit light for a long time after the power is turned off.
- the semiconductor laminated portion may be made of a nitride semiconductor, and may be formed so as to emit white light by further mixing a light emission color conversion member that converts the wavelength of light emitted from the light emitting layer.
- the semiconductor stacked portion is formed on a light-transmitting substrate, the back surface of the substrate is a light extraction surface that emits light from the light emitting layer, and the light emitting color conversion member and the fluorescent light are formed on the back surface of the substrate.
- At least one of a material and a phosphorescent material may be provided.
- a resin layer that covers the semiconductor chip having the plurality of light emitting portions is provided, and a fluorescent material having an afterglow time of 10 milliseconds to 1 second and an afterglow time of 1 second or less are provided in the resin layer. At least one of the above phosphorescent materials may be mixed, and at least one of a fluorescent material having an afterglow time of 10 milliseconds to 1 second and a phosphorescent material having an afterglow time of 1 second or more may be mixed on the surface of the resin layer. One may be provided to cover.
- a phosphor material having an afterglow time of 10 milliseconds to 1 second is contained on the light emitting surface side such as the front surface of the semiconductor laminated portion or the back surface of the substrate in which a plurality of light emitting portions are formed. fluorescence Since the body layer and a layer containing Z or a phosphorescent glass material with an afterglow time of 1 second or more are provided, multiple light emitting parts emit only half waves by AC drive or turn on and off for each half wave by reverse parallel connection Even if is repeated, when it is turned off, light irradiation is maintained by the phosphor layer and Z or phosphorescent material, and continuous light irradiation is continued without being affected by on / off by alternating current.
- This continuation of light irradiation by the phosphor material or the phosphorescent glass material can maintain the light emission sufficiently even when the light emitting diode is not connected in antiparallel and emits light only with the half wave of alternating current. Does not occur.
- FIG. 1 is a partial cross-sectional explanatory view of an embodiment of a semiconductor light-emitting device according to the present invention.
- FIG. 2 is an explanatory view similar to FIG. 1, showing another embodiment of a semiconductor light emitting device according to the present invention.
- FIG. 3 is an explanatory view similar to FIG. 1, showing another embodiment of a semiconductor light emitting device according to the present invention.
- FIG. 4 is a cross-sectional explanatory view showing still another embodiment of the semiconductor light emitting device according to the present invention.
- FIG. 5 is a diagram showing an arrangement example of light emitting units of a semiconductor light emitting device according to the present invention.
- FIG. 6 is a diagram showing an equivalent circuit of FIG.
- FIG. 7 is a diagram illustrating a conventional circuit example in which an illumination device is formed using LEDs.
- a semiconductor stacked portion 17 is formed by stacking semiconductor layers so as to form a light emitting layer on a substrate 11.
- the semiconductor laminated portion 17 is electrically separated into a plurality of parts, and a pair of electrodes 19 and 20 are provided on each of them, so that a plurality of light emitting parts 1 are formed.
- the plurality of light emitting units 1 are connected in series and / or in parallel via the wiring film 3, and the afterglow time is within 10 milliseconds to 1 second on the light emitting surface side of the plurality of light emitting units 1.
- a phosphor layer 6 containing the fluorescent material is provided.
- a phosphor layer 6 is provided on the back surface of the substrate 11 with the back surface side of the substrate 11 of the semiconductor stacked portion 17 stacked on the substrate 1 as a light emitting surface.
- the phosphor layer 6 may be provided on the surface of the semiconductor multilayer portion 17 on the surface where the wiring film 3 is formed, or as described later in FIG. 4, the semiconductor multilayer portion on the surface side of the semiconductor multilayer portion.
- the phosphor layer 6 is formed by mixing a phosphor material having a certain afterglow time with a translucent resin material such as an epoxy resin, and applying and curing the mixture on the back surface of the substrate 11.
- a translucent resin material such as an epoxy resin
- a light emitting portion 1 that emits blue light (hereinafter also simply referred to as an LED) is formed by stacking nitride semiconductors, and the surface thereof is not shown, for example, absorbs blue light and is yellow.
- YAG (yttrium 'aluminum' garnet) phosphor (1Z10 afterglow time is 150-200nsec) and Sr-Zn that convert the yellow light into white light by mixing with the blue light emitted from the LED chip -A light emitting device for white light is formed by providing a light emitting color conversion member made of La phosphor or the like.
- the luminescent color conversion member is mixed with a translucent resin together with a phosphor material having afterglow to form a luminescent color conversion phosphor layer and a phosphor layer having afterglow. it can.
- the light emission color conversion member differs depending on the light emission color of the light emitting portion and the desired light emission color, and the light emission color conversion member may not be provided.
- the phosphor layer of the present invention is a layer containing a phosphor material having an afterglow time of 10 msec to: Is, and eliminates eye flicker due to afterglow.
- a semiconductor light emitting device that emits light of a desired color can be obtained by mixing a light emitting color conversion member. Of course, these can also be provided as separate layers.
- the light emitting section 1 that emits blue light is formed of a nitride semiconductor laminate, and is formed as a light emitting device that emits white light by a light emitting color conversion member. . Therefore, the semiconductor layer stacked portion 17 is formed by stacking nitride semiconductor layers.
- the semiconductor layer stacked portion 17 is formed by stacking nitride semiconductor layers.
- FIG. 1 in the example shown in FIG.
- the separation grooves 17a that separate the light emitting sections 1 are separated from each other.
- the surfaces of the semiconductor stacked portions sandwiching 17a are formed on substantially the same surface. If the separation groove 17a is formed in such a substantially identical surface portion, the separation groove 17a is formed to be narrow enough to obtain an electrical insulation, so that a recess is formed in the insulating film contained therein. This is because the wiring film 3 can be formed with almost no step even if it is possible.
- substantially the same surface does not mean that it is completely the same surface. This means that it is below the level that does not cause step coverage problems due to the level difference when forming the wire film. Specifically, this means that the difference between both sides is about 0.3 zm or less.
- a nitride semiconductor is a compound of a group III element Ga and a group V element N, or a group III element Ga partially or wholly substituted with other group X elements such as Al and In, and Z Or a semiconductor made of a compound (nitride) in which a part of the group V element N is substituted with another group V element such as P or As.
- the substrate is selected from the viewpoint of the lattice constant and the thermal expansion coefficient according to the semiconductor layer to be laminated.
- the semiconductor laminated portion 17 laminated on the substrate 11 made of sapphire has, for example, a low temperature buffer layer 12 made of GaN of about 0.005 to 0.1 xm, and then a high temperature buffer layer 13 made of undoped GaN force:!
- l ⁇ 5 / im, material with a band gap energy smaller than that of the barrier layer for example:! ⁇ 3nm InGaN
- 0.13 0.87 active layer 15 with multiple quantum well (MQW) structure in which 3 to 8 pairs of barrier layers and 10 to 20 nm GaN barrier layers are stacked, 0.05 to 0.3 xm, p-type AlGaN compound semiconductor
- a high-temperature buffer layer 13 made of undoped and semi-insulating GaN is formed.
- the substrate is made of an insulating substrate such as sapphire, there is no problem if a separation groove to be described later is formed up to the substrate even if it is not semi-insulating.
- a semi-insulating semiconductor layer is provided, so that it is possible to electrically isolate each light emitting portion without electrically etching the entire substrate surface. Since it can isolate
- the substrate 11 is made of a semiconductor substrate such as SiC, the adjacent light emitting parts are electrically separated. Therefore, it is necessary to form a semi-insulating high-temperature buffer layer 13 with an AND in order to make each light emitting part independent.
- the n-type layer 14 and the p-type layer 16 are examples composed of two types of barrier layers and contact layers.
- a layer containing A1 is present on the active layer 6 side from the viewpoint of the carrier confinement effect.
- the GaN layer is acceptable.
- these may be formed of other nitride semiconductor layers, and other semiconductor layers may be further interposed.
- the active layer 15 is sandwiched between the n-type layer 14 and the p-type layer 16, but a pn junction structure in which the n-type layer and the P-type layer are directly joined. But you can.
- a translucent conductive layer 18 made of, for example, ZnO and capable of making ohmic contact with the p-type semiconductor layer 16 is provided in a thickness of about 0.01 to 0.5 ⁇ m. .
- This translucent conductive layer 18 is not limited to ZnO, but even ITO or a thin alloy layer of about 2 to 1 OOnm of Ni and Au diffuses current throughout the chip while transmitting light. be able to.
- a part of the semiconductor laminated portion 17 is removed by etching to expose the n-type layer 14, and a separation groove 17 a is formed by etching at a distance d in the vicinity of the exposed portion of the n-type layer 14. Yes.
- the reason why the separation groove 17a is not formed from the exposed portion of the n-type layer 14 but is separated from the exposed portion of the n-type layer 14 by a distance d is that the width of the exposed portion of the separation groove 17a and the n-type layer 14 is This is a force for preventing an increase in the level difference of the wiring film 3 at the separation groove 17a portion. In the present invention, it is not essential to provide this distance d.
- this separated portion does not contribute to the light emitting region (the portion of length L1) and becomes the dummy region 5, and is used as a space for forming a heat dissipation portion, wiring, etc., as will be described later.
- the distance d is set within the range of:! ⁇ 50 xm.
- the separation groove 17a is formed by dry etching or the like, but is formed with a width w as narrow as possible within a range that can be electrically separated, and is about 0.6 to 5 ⁇ m, for example, about 1 ⁇ m (the depth is 5 ⁇ m). m).
- a p-side electrode (upper part) is formed on a part of the translucent conductive layer 18 by a laminated structure of Ti and Au. Electrode) 19 is formed, and a part of the semiconductor laminated portion 17 is removed by etching and exposed.
- the n-type electrode 14 for the ohmic contact (lower electrode) 20 is made of Ti_Al alloy or the like. Is formed.
- the lower electrode 20 is formed with a thickness of about 0.4 to 0.6 zm and is almost as high as the upper electrode 19. Is formed.
- the wiring film 3 is deposited on the lower electrode 20 by vacuum evaporation or the like even if it is not almost the same height as the upper electrode 19, there is not so much difference in level and the normal height may be maintained. .
- the thickness of the lower electrode 20 is formed to be thicker than the thickness of the upper electrode 19, the reliability of the wiring film is improved, and it is more preferable if the thickness is as high as that of the upper electrode 19.
- an insulating film 21 made of, for example, SiO is provided in the exposed surface of the semiconductor laminated portion 17 and the isolation groove 17a so that the surfaces of the upper electrode 19 and the lower electrode 20 are exposed.
- a plurality of light emitting sections 1 separated by the separation grooves 17a are formed on the substrate 11.
- the n-side electrode 20 of one light emitting part la and the p side electrode 19 of the light emitting part lb adjacent to the light emitting part la are connected by the wiring film 3.
- the wiring film 3 is formed to a thickness of about 0.3 to l ⁇ m by vacuum deposition or sputtering of a metal film such as Au or A1.
- the wiring film 3 is formed so that each light emitting portion 1 has a desired connection in series or in parallel.
- n-side electrode 20 of one light-emitting unit la separated by the separation groove 17a and the p-side electrode 19 of the adjacent light-emitting unit lb are sequentially connected, Can be connected in series until the total operating voltage of 3.5 to 5 V per unit is close to commercial power supply voltage such as 100 V (strictly, it can be adjusted by connecting resistors and capacitors in series) By connecting them in parallel and connecting them in parallel so that the pn connection direction is in the opposite direction, it is possible to make a bright light source that is AC driven at 100V.
- TMG ammonia
- TMA trimethylaluminum
- TMA trimethylindium
- Reactive gas such as (MIn), and SiH as dopant gas for n-type, p-type
- a low-temperature buffer layer 12 having a GaN layer strength is formed at a temperature of about 0.005 to 0.1 / im at a low temperature of about 400 to 600 ° C. : Raise the temperature to about 1200 ° C, and make the semi-insulating high-temperature buffer layer 13 made of undoped GaN: about ⁇ 3 ⁇ m, Si-doped n-type GaN and AlGaN-based compound semiconductor n-type Layer 14 is deposited to about l-5 / im.
- the growth temperature is lowered to a low temperature of 400-600 ° C, for example: In!
- An active layer 6 of 1 to (3) structure in which 3 to 8 pairs of N-well layers and 10 to 20 nm GaN barrier layers are stacked is formed to a thickness of about 0.05 to 0.3111.
- the temperature in the growth apparatus is raised to about 600 to 1200 ° C., and the p-type AlGaN compound semiconductor layer and the p-type layer 16 made of GaN are combined and laminated to about 0.2 to 1 ⁇ m.
- a protective film such as SiN is provided on the surface to activate the p-type dopant.
- Annealing is performed at about 800 ° C for about 10 to 60 minutes.
- a ZnO layer is formed to a thickness of about 0.0 :! to 0.5 zm by MBE, sputtering, vacuum evaporation, PLD, ion plating, etc.
- a translucent conductive layer 18 is formed.
- a part of the laminated semiconductor laminated portion 17 is etched by reactive ion etching using chlorine gas or the like so that the n-type layer 14 is exposed.
- the semiconductor laminated portion 17 is separated from the exposed portion of the n-type layer 14 by a width of about 1 ⁇ . Similarly, by dry etching, the semiconductor laminated part 17 Etching is performed up to the high temperature buffer layer 13. The distance d between the exposed portion of the n-type layer 14 and the separation groove 17a is, for example, about 1 ⁇ m.
- Ti and A1 are successively deposited on the exposed surface of the n-type layer 14 by about 0.1 ⁇ m and 0.3 ⁇ m, respectively, by sputtering or vacuum deposition, and about 600 ° C by RTA heating. Then, the n-side electrode 20 is formed by alloying by heat treatment for 5 seconds. If the n-side electrode is formed by a lift-off method, the n-side electrode having a predetermined shape can be formed by removing the mask. Thereafter, Ti and Au are vacuum-deposited on the translucent conductive layer 18 for the p-side electrode 19 by about 0.1 ⁇ m and 0.3 ⁇ m, respectively, thereby forming the p-side electrode 19. After that, an insulating film 21 such as SiO is formed on the entire surface, and the p-side electrode 19 and the n-side
- a part of the insulating film 21 is removed by etching so that the surface of the electrode 20 is exposed. Then, by providing a resist film having an opening only in the portion connecting the exposed P-side electrode 19 and n-side electrode 20, and by providing a Au film or A1 film by vacuum deposition, etc., and then removing the resist film, etc. A desired wiring film 3 is formed.
- a phosphor material having an afterglow time of 10 msec :: Is such as an epoxy resin mixed with ZnS: Cu, is applied to the back surface of the substrate 11 and solidified by drying.
- a phosphor layer 6 is formed.
- the light emitting unit group composed of a plurality of light emitting units 1 is formed into a chip from a semiconductor, thereby obtaining a semiconductor light emitting device chip whose partial cross section and plan view are shown in FIGS. 1 and 5. It is done.
- the electrode pad 4 for connection to the outside is formed simultaneously with the same material as the wiring film 3.
- the exposed portion of the n-type layer 14 for forming the n-side electrode 20 and the separation groove 17a for separating the light emitting portion 1 are in the vicinity. However, it is formed in another part (the width of the dummy area 5 can be widened according to the purpose), and the n-side electrode 20 is formed higher, so that the adjacent light emitting parts 1 Even if the wiring film 3 that connects the n-side electrode 20 and the p-side electrode 19 is formed via the separation groove 17a, it is not necessary to connect through a large step.
- the depth of the isolation groove 17a is about 3 to 6 xm, and its width is about 0.6 to 5 ⁇ m, for example, about 1 ⁇ m, which is a very narrow interval that allows electrical isolation to be obtained. Even if 21 is not completely buried, the surface is almost blocked, and the wiring film 3 formed on the surface does not have a large step even if there is a slight dent. Therefore, A semiconductor light emitting device having a highly reliable wiring film 3 can be obtained without any problem of coverage.
- the exposed portion of the n-type layer 14 and the separation groove 17a are formed at different locations so that the surface of the semiconductor layer sandwiching the separation groove 17a is substantially the same surface.
- the problem of disconnection can be prevented by providing a dummy region (intermediate region) having an inclined surface. .
- FIG. 2 An example of this is shown in FIG.
- a layer 7 containing a phosphorescent glass material is further formed on the surface of the phosphor layer 6 which is not limited to the deformation of the structure of the light emitting unit 1.
- the phosphorescent glass is a glass in which a phosphorescent material such as terbium is mixed, and such a glass is powdered and taken into a light-transmitting resin so that it can be provided at a desired place by coating. it can.
- the afterglow time can be adjusted.
- the phosphor layer is allowed to remain after a minute time by setting the afterglow time to about several seconds.
- the afterglow time it is possible to completely prevent flickering due to AC drive, and by setting the afterglow time to about 30 to 120 minutes, for example, emergency lights and guide lights during power outages It can be used for As shown in FIG. 2, the provision on the phosphor layer 6 has an advantage that the absorption of light is reduced when the accumulated light is mainly emitted, although it depends on the phosphor material. .
- the separation groove 17a is formed so as to extend from the exposed surface of the n-type layer 14 to the high-temperature buffer layer 13 instead of being formed from above the p-type layer 16 of the semiconductor stacked portion 17. ing.
- an exposed portion of the n-type layer 14 is also formed on the side opposite to the side on which the n-side electrode 20 is formed across the separation groove 17a, and the light-transmitting property on the semiconductor stacked portion 17 is formed from the exposed portion of the n-type layer 14 It is characterized in that a dummy region 5 having an inclined surface reaching the surface of the conductive layer 18 is formed.
- This dummy region 5 is formed between one light emitting portion la and the adjacent light emitting portion lb, and its width L2 is formed to be about 10 to 50 ⁇ m. At this time, the width L1 of the light emitting section 1 is about 60 ⁇ m.
- the dummy region 5 has an n-type layer 14 exposure. An inclined surface 17c extending from the protruding portion to the surface of the semiconductor stacked portion 17 is formed. In FIG. 2, the structure diagram is only schematically shown, and the dimensions are not accurate.
- the step between the surface of the translucent conductive layer 18 and the n-type layer 14 is As described above, the dimension from the exposed surface of the n-type layer 14 to the bottom of the separation groove 17a is about 3 to 6 zm at about 0.5 to lxm. However, the width w of the separation groove 17a is about lxm as described above, and at least the surface of the separation groove 17a is almost supported by the insulating film 21 even if a slight depression is formed. Therefore, if the wiring film 3 is formed through the exposed surface of the n-type layer 14 in the dummy region 5, the step coverage problem can be almost eliminated. In the example shown in FIG. Surface 17c is formed. Thereby, the insulating film 21 and the wiring film 3 have a gentle gradient, and the reliability of the wiring film 3 can be further improved.
- an inclined surface 17c for example, a portion other than a place where the inclined surface is formed is masked with a resist film or the like, and the substrate 11 is obliquely etched by dry etching or the like.
- An inclined surface 17c as shown in FIG. 2 can be formed.
- the p-side and n-side electrodes 19 and 20 are formed, the insulating film 21 is formed so that the electrode surfaces are exposed, and the wiring film 3 is formed.
- a semiconductor light emitting device having the structure shown in FIG. 2 can be obtained.
- the inclined surface 17c as described above can be formed.
- the dummy region 5 itself does not contribute to light emission, but the adjacent light emitting unit 1 emits light.
- Light can be emitted from the surface and side surfaces of this dummy region 5 through the semiconductor layer, and its luminous efficiency (output to input) is improved compared to the case where the light emitting part 1 is formed continuously. To do.
- the light-emitting part 1 is formed continuously, the heat generated by energization is difficult to escape, which may eventually reduce the light-emitting efficiency and reduce the reliability.
- the dummy region 5 that is not allowed to be formed is easy to dissipate heat without generating heat, it is preferable from the viewpoint of reliability. Furthermore, as shown in FIG. 5 described above, when two light emitting portions 1 arranged side by side are connected by the wiring film 3, a place for forming the wiring film 3 is required. In addition, it forms additional components such as inductors and capacitors, which will be described later, which may be used to adapt to the series resistance S100V. Can be used as a space to play. In addition, since there is a space to freely form a wiring film, the light-emitting part 1 itself has a merit of shaving to a desired shape that takes into account the light extraction structure, such as a circular shape (top view shape) instead of a square shape. There is also. In other words, not only the wiring film is prevented from being disconnected, but also has various merits. The use of this dummy area 5 is the same in the example of FIG.
- the second separation groove extending from the surface to the high-temperature buffer layer 13 also between the dummy region 5 and the light emitting portion 1 adjacent on the higher side of the semiconductor multilayer portion 17. 17b is formed.
- the second separation groove 17b is also formed in a place where the surface of the semiconductor laminated portion is substantially the same surface, and is as narrow as possible, that is, with a width of about lxm as long as it can be electrically separated as described above. Is formed. Therefore, even if the wiring film 3 is formed on the second isolation groove 17b via the insulating film 21, problems such as disconnection do not occur.
- the second separation groove 17b may be omitted. However, since the second separation groove 17b is provided, the separation groove 17a may not reach the high temperature buffer layer 13 completely due to variations in etching. In addition, electrical separation between the adjacent light emitting units 1 can be ensured, and the reliability thereof can be improved.
- FIG. 3 is an example in which a phosphor layer is not provided and a layer 7 containing a phosphorescent glass material is formed on the back surface of the substrate 1 together with another example of a structure for forming the wiring film 3.
- the afterglow for a minute of less than 1 second The purpose can be achieved by providing the layer 7 containing phosphorescent glass having a long afterglow for about several minutes or more, which is not necessary to provide the phosphor layer having the above.
- An example is shown in Figure 3.
- the separation groove 17a for separating each light emitting portion 1 is not formed in a portion where the surface of the semiconductor layer is substantially the same.
- the separation groove 17a is formed at the portion.
- spin separation is applied to the separation groove 17a, for example, the product name spinfil 130 of Clariant 'Japan Co., Ltd., and then cured at 200 ° C for 10 minutes and 400 ° C for 10 minutes to 400 ° C.
- a transparent insulating film that can withstand high temperatures of about C, it is possible to fill in recesses such as isolation trenches.
- FIG. 4 is a diagram showing another embodiment of the semiconductor light emitting device according to the present invention. That is, each example shown in FIGS. 1 to 3 is an example in which a phosphor layer 6 is provided on the back surface of the substrate 11 and a layer 7 containing phosphorescent glass. This phosphor layer 6 and the like emit light. As long as it is provided on the surface side, it may be provided on the surface side of the semiconductor laminate 17 (the surface of the wiring film 3 or the surface through another resin layer, etc.), as shown in FIG. In other words, the phosphor layer 6 in which the above-described phosphor material is contained in the resin layer covering the semiconductor laminated portion 17 is formed into a desired outer shape.
- a translucent resin such as an epoxy resin contains the above-mentioned fluorescent material having an afterglow, and is formed on the substrate 11 as shown in FIGS.
- a semiconductor stacked portion 17 is formed, and a semiconductor chip in a state in which a plurality of light emitting portions 1 are connected by a wiring film 3 in a pattern such as FIG. 5 is connected to the external wirings 31 and 32.
- the resin layer is formed as a package in a desired shape, and the phosphor layer 6 is provided by mixing the phosphor material in the resin layer.
- the light emitting unit 1 is schematically shown, and the wiring film and the like are omitted, but the configuration of the light emitting unit 1 is the same as the example shown in FIGS. 1 to 3. Structure.
- the external wirings 31 and 32 connected to the pair of electrode pads 4 can also be formed like a power bulb socket schematically shown.
- the phosphor layer having afterglow and the layer containing Z or a phosphorescent glass material are provided in the semiconductor light emitting device itself, only the phosphor layer is provided.
- a structure it is possible to eliminate the unpleasantness of flicker caused by AC driving without causing afterglow to cause a sense of incongruity.
- flicker can be completely prevented, and by providing a layer containing a phosphorescent glass material with a long afterglow time, it can be used for emergency lights, guide lights, etc. It is possible to use S.
- AC driving can be performed. It can be used as a lighting device without flickering, and can also be used as an emergency light in the event of a power failure.
- the present invention can be used for various lighting devices such as a general lighting device and a traffic light instead of a fluorescent lamp using a commercial AC power source.
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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US11/662,542 US20070278502A1 (en) | 2004-09-13 | 2005-09-12 | Semiconductor Light Emitting Device |
Applications Claiming Priority (2)
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JP2004265464A JP3802911B2 (ja) | 2004-09-13 | 2004-09-13 | 半導体発光装置 |
JP2004-265464 | 2004-09-13 |
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WO2006030734A1 true WO2006030734A1 (ja) | 2006-03-23 |
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PCT/JP2005/016752 WO2006030734A1 (ja) | 2004-09-13 | 2005-09-12 | 半導体発光装置 |
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US (1) | US20070278502A1 (ja) |
JP (1) | JP3802911B2 (ja) |
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Also Published As
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JP2006080442A (ja) | 2006-03-23 |
US20070278502A1 (en) | 2007-12-06 |
JP3802911B2 (ja) | 2006-08-02 |
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