WO2007024017A1 - 発光層形成用基材、発光体及び発光物質 - Google Patents
発光層形成用基材、発光体及び発光物質 Download PDFInfo
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- WO2007024017A1 WO2007024017A1 PCT/JP2006/317157 JP2006317157W WO2007024017A1 WO 2007024017 A1 WO2007024017 A1 WO 2007024017A1 JP 2006317157 W JP2006317157 W JP 2006317157W WO 2007024017 A1 WO2007024017 A1 WO 2007024017A1
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- light emitting
- layer
- emitting layer
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- light
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- 239000000463 material Substances 0.000 title claims abstract description 87
- 230000015572 biosynthetic process Effects 0.000 title claims abstract description 13
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- 238000000034 method Methods 0.000 claims abstract description 80
- 238000005253 cladding Methods 0.000 claims abstract description 58
- 239000004065 semiconductor Substances 0.000 claims abstract description 49
- 150000004767 nitrides Chemical class 0.000 claims abstract description 47
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- QGZKDVFQNNGYKY-UHFFFAOYSA-N Ammonia Chemical compound N QGZKDVFQNNGYKY-UHFFFAOYSA-N 0.000 description 6
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 6
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- 229910052733 gallium Inorganic materials 0.000 description 3
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- GYHNNYVSQQEPJS-UHFFFAOYSA-N Gallium Chemical compound [Ga] GYHNNYVSQQEPJS-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HCHKCACWOHOZIP-UHFFFAOYSA-N Zinc Chemical compound [Zn] HCHKCACWOHOZIP-UHFFFAOYSA-N 0.000 description 1
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- AJNVQOSZGJRYEI-UHFFFAOYSA-N digallium;oxygen(2-) Chemical compound [O-2].[O-2].[O-2].[Ga+3].[Ga+3] AJNVQOSZGJRYEI-UHFFFAOYSA-N 0.000 description 1
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- UIUXUFNYAYAMOE-UHFFFAOYSA-N methylsilane Chemical compound [SiH3]C UIUXUFNYAYAMOE-UHFFFAOYSA-N 0.000 description 1
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- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
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- JLTRXTDYQLMHGR-UHFFFAOYSA-N trimethylaluminium Chemical compound C[Al](C)C JLTRXTDYQLMHGR-UHFFFAOYSA-N 0.000 description 1
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- 239000012808 vapor phase Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/005—Processes
- H01L33/0062—Processes for devices with an active region comprising only III-V compounds
- H01L33/0066—Processes for devices with an active region comprising only III-V compounds with a substrate not being a III-V compound
- H01L33/007—Processes for devices with an active region comprising only III-V compounds with a substrate not being a III-V compound comprising nitride compounds
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers 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 bodies
- H01L33/20—Semiconductor devices having potential barriers 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 bodies with a particular shape, e.g. curved or truncated substrate
- H01L33/24—Semiconductor devices having potential barriers 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 bodies with a particular shape, e.g. curved or truncated substrate of the light emitting region, e.g. non-planar junction
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L33/00—Semiconductor devices having potential barriers specially adapted for light emission; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L33/02—Semiconductor devices having potential barriers 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 bodies
- H01L33/16—Semiconductor devices having potential barriers 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 bodies with a particular crystal structure or orientation, e.g. polycrystalline, amorphous or porous
Definitions
- the present invention relates to a substrate for forming a light emitting layer, a light emitter, and a light emitting substance, and more specifically, a substrate for forming a light emitting layer for forming a light emitting layer made of a nitride semiconductor by vapor deposition, a light emitter and a light emitting substance.
- a substrate for forming a light emitting layer for forming a light emitting layer made of a nitride semiconductor by vapor deposition, a light emitter and a light emitting substance is about. Background art
- ⁇ -VI compound semiconductors such as ZnS have been studied for a long time.
- the group VI-VI compound semiconductor has a problem that the lifetime is lowered when it is brought into a highly excited state using an electron beam in order to achieve high brightness. For this reason, development of highly resistant materials has been desired.
- Examples of highly resistant phosphor materials include nitride semiconductors.
- Nitride semiconductors are physically and chemically very stable, so even if they are excited by an electron beam or the like, their lifetime is not reduced, and they are highly resistant phosphor materials. It can be expected.
- nitride semiconductors it is difficult to produce a bulk single crystal from the melt.
- phosphors using nitride semiconductors have conventionally been produced by utilizing the growth of polycrystalline powder (see, for example, Patent Document 1: Japanese Patent Laid-Open No. 9-2 3 5 5 48)
- Patent Document 2 ⁇ Japanese Patent Laid-Open Publication No. H11-1 3 3 96 8 1 has been adopted.
- This patent document 1 discloses gallium sulfide as a gallium compound not containing oxygen, dimethyl sulfide as an ignium compound not containing oxygen, and sulfidation of Zn or Mg as a doping substance containing no oxygen. There is disclosed a method for producing a granular phosphor by heating a raw material powder composed of a product in an ammonia atmosphere.
- Patent Document 2 a conductive film is formed on an insulating substrate, by a metal organic chemical vapor deposition (MOCVD), I n x G a y A 1 x _ x _ y N: from Z n S i A technology is disclosed in which a polycrystalline fluorescent crystal film is grown on a conductive film, and the crystal axes in the fluorescent crystal film are then oriented by annealing.
- MOCVD metal organic chemical vapor deposition
- the present invention has been made in view of the above circumstances, and it is possible to improve luminous efficiency by microcrystallizing a light emitting layer while utilizing a vapor phase growth method advantageous for improving crystal quality and the like. It is a technical problem to be solved to provide a substrate for forming a light emitting layer, a light emitter, and a light emitting substance.
- the light emitting layer forming base material according to claim 1, which solves the above problem, comprises a single crystal base material and an oriented microcrystalline layer formed on the single crystal base material, and is a light emitting device comprising a nitride semiconductor.
- a substrate for forming a light emitting layer in which a layer is formed on the oriented microcrystalline layer by a vapor phase growth method, and a crystal axis of each crystal constituting the oriented microcrystalline layer is formed on the single crystalline substrate. Oriented in a specific direction, and the orientation The average crystal grain size of each crystal constituting the microcrystalline layer is 1 to 100 nm.
- the light-emitting body according to claim 2 for solving the above-mentioned problem is formed by a vapor phase growth method on the light-emitting layer-forming substrate according to claim 1 and the oriented microcrystalline layer of the light-emitting layer-forming substrate. And a light emitting layer made of a nitride semiconductor, wherein the light emitting layer is composed of microcrystalline grains having an average grain size of 1 to 100 nm.
- the light-emitting body according to claim 2 in a preferred embodiment, comprises a nitride semiconductor formed on the oriented microcrystalline layer by a vapor phase growth method and containing a nuclear material serving as a starting point when the light-emitting layer grows.
- An intermediate layer is further provided, and the light emitting layer is formed on the intermediate layer.
- the single crystal substrate is made of a silicon substrate
- the light-emitting body according to claim 2, 3, 4 or 5, in a preferred embodiment, is a clad formed of a nitride semiconductor having a bandgap energy larger than that of the light-emitting layer, which is formed on the light-emitting layer by a vapor phase growth method. It further comprises a layer.
- the luminescent material according to claim 7, which solves the above problem, is peeled off from the substrate for forming the luminescent layer of the luminescent material according to claim 6, wherein the intermediate layer, the luminescent layer, and the cladding layer are separated. It is characterized by including.
- the substrate for forming a light emitting layer according to claim 8, which solves the above problem, comprises a single crystal substrate of Si, and a light emitting layer made of a nitride semiconductor is formed on the single crystal substrate by a vapor phase growth method.
- the light emitting layer forming base material is formed by finely processing the surface of the single crystal base material, and the average length of the longest part is 1 to 100 0 n It is characterized by having a plurality of (nil) S i plane parts (where n is an integer of 0 to 6).
- the light-emitting body according to claim 9 that solves the above problem is formed by a vapor phase growth method on the substrate for forming a light-emitting layer according to claim 8, and on the (nil) Si surface portion of the substrate for forming a light-emitting layer. And a light emitting layer made of a nitride semiconductor, wherein the light emitting layer is composed of fine crystal grains having an average particle diameter of 1 to 100 nm.
- the light-emitting body according to claim 9, in a preferred embodiment, is a nitride semiconductor comprising a nuclear material that is formed on the (nil) Si surface portion by a vapor deposition method and serves as a starting point when the light-emitting layer grows.
- the light emitting layer is formed on the intermediate layer. .
- the intermediate layer has a bandgap energy larger than that of the light emitting layer.
- the preferred embodiment of the light emitter according to claim 10 or 11, wherein the intermediate layer is made of A l x G a y N (x + y 1, 0 ⁇ x ⁇ 1 0 ⁇ y ⁇ 1),
- the light emitter according to claim 9, 10, 11, or 12 in a preferred embodiment, is formed from a nitride semiconductor having a bandgap energy larger than that of the light emitting layer formed on the light emitting layer by a vapor phase growth method.
- the cladding layer is further provided.
- the light-emitting substance according to claim 14 for solving the above-mentioned problem is peeled off from the light-emitting layer forming substrate of the light-emitting body according to claim 13, wherein the intermediate layer, the light-emitting layer and the clad are separated. It is characterized by including a layer.
- FIG. 1 is a cross-sectional view schematically showing a manufacturing process of a light emitting layer forming substrate, a light emitter, and a light emitting substance according to Example 1 of the present invention.
- FIG. 2 relates to Example 2 of the present invention and relates to a substrate for forming a light emitting layer, a light emitter, and a light emitting device. It is sectional drawing which shows the manufacturing process of an optical substance typically.
- Fig. 3 shows the CL spectrograph of the In G a N emission layer when the Si concentration is constant at 4.6 X 10 18 cm 3 and the Zn concentration is variously changed.
- Figure 4 relates to a reference example, the constant S i concentration 4. 6 X 1 0 1 8 cm 3 , in the case of variously changing the Z n concentration, shows the emission intensity of I n G a N-emitting layer It is a figure.
- Figure 5 shows the emission intensity of the InGaN emission layer when the Zn concentration is constant at 4.0 X 1 0 19 cm 3 and the Si concentration is variously changed for reference purposes. It is. BEST MODE FOR CARRYING OUT THE INVENTION
- a substrate for forming a light emitting layer according to the invention of claim 1 is composed of a single crystal substrate and an oriented microcrystalline layer formed on the single crystal substrate, and is a light emission comprising a nitride semiconductor.
- a layer is formed on the oriented microcrystalline layer by a vapor phase growth method.
- the material of the single crystal substrate is not particularly limited as long as it is stable when forming the oriented microcrystalline layer, the intermediate layer, and the light emitting layer.
- S i, MgO, A 1 2 O 3, S i C, G a As, and G e can be adopted, but S i is preferable.
- the structure of the single crystal substrate may be a single layer structure made of a single material or a multilayer structure made of a plurality of kinds of materials.
- the shape and size of the single crystal base material are not particularly limited, and can be set as appropriate.
- the kind of the oriented microcrystalline layer is not particularly limited as long as it can be easily controlled in size and has stability under growth conditions.
- the thickness of the oriented microcrystalline layer is preferably 5 to 100 nm. If the thickness of the oriented microcrystalline layer is less than 5 nm, the effect of forming the oriented microcrystalline layer cannot be fully exhibited. On the other hand, when the thickness of the oriented microcrystalline layer exceeds 100 000 nm, it becomes difficult to orient the single crystal substrate. From such a viewpoint, the thickness of the oriented microcrystalline layer is more preferably 50 to 200 nm.
- each crystal constituting the oriented microcrystalline layer has a crystal grain size that is as uniform as possible, that is, a crystal grain size distribution that is as small as possible. If the crystal grain size in the oriented microcrystalline layer is uniform, it is advantageous to uniformly microcrystallize the intermediate layer and the light emitting layer formed thereon.
- the method for forming this oriented microcrystalline layer is not particularly limited, and various methods suitable for the type of oriented microcrystalline layer can be employed. For example, when adopting ZnO or Si as the oriented microcrystalline layer, a polycrystalline layer having a predetermined thickness is formed on the single crystal substrate by a method such as sputtering or CVD.
- an oriented microcrystalline layer having a predetermined thickness can be formed by carrying out a surface modifying treatment step in which the polycrystalline layer is surface-modified to form the oriented microcrystalline layer.
- a surface modification treatment process for example, annealing is performed under conditions of vacuum, atmosphere such as air or inert gas, temperature of about 300 to 120 ° C, and time of about 5 to 120 minutes. Processing can be performed.
- an oxygen-containing atmosphere such as air, a temperature of about 100 ° C.
- An oriented microcrystalline layer having a predetermined thickness can be formed on the Si substrate by performing a thermal oxidation treatment under conditions of a time of about 10 2 to 10 5 seconds.
- a temperature of about 100 ° C., and 10 2 to 1 with respect to the single crystal substrate of S i can be formed on the Si substrate by performing thermal nitriding under the condition of a time of about 5 seconds.
- C An oriented microcrystalline layer having a predetermined thickness can be formed on a single crystal substrate by a known synthesis method such as a VD apparatus or an MBE apparatus.
- the crystal axis of each crystal constituting the oriented microcrystalline layer is oriented in a specific direction with respect to the single crystal substrate, and the oriented microcrystalline layer is constituted.
- the average grain size of each crystal is 1 to 100 nm.
- j that is oriented in a specific direction with respect to a single crystal substrate is a crystal axis of each crystal constituting the oriented microcrystalline layer with respect to a crystal axis of the single crystal constituting the single crystal substrate.
- the oriented microcrystalline layer In the oriented microcrystalline layer, about 50 to 90% (preferably about 80 to 90%) of the crystals constituting the oriented microcrystalline layer have a crystal axis in a specific direction with respect to the single crystal substrate. It is preferably oriented.
- the oriented microcrystalline layer when the proportion of crystals oriented in a specific direction with respect to the single crystal substrate is lowered, the growth density of the oriented microcrystalline layer is reduced and the number of nuclei that are the starting points of crystal growth is reduced As a result, the concentration of the raw material on one nucleus occurs and the crystal growth rate increases rapidly. As a result, it is difficult to achieve microcrystallization of the intermediate layer and the light emitting layer formed on the oriented microcrystalline layer. .
- the oriented microcrystalline layer if the ratio of crystals oriented in a specific direction with respect to the single crystal substrate exceeds about 90%, it becomes a single crystal film and cannot grow as a microcrystal.
- the average crystal grain size in the oriented microcrystalline layer is preferably 5 to 500 nm, more preferably 5 to 20 O nm.
- the average crystal grain size of each crystal constituting the light emitting layer, which is formed through the intermediate layer or directly, is the average crystal grain size of each crystal constituting the oriented microcrystalline layer is 1 to 100 nm.
- the average crystal grain size of each crystal constituting the oriented microcrystalline layer is 5 to 500 nm, 5 to 500 nm
- the average crystal grain size of each crystal constituting the oriented microcrystalline layer is 5 to 200 nm, it can be about 5 to 200 nm.
- the light emitting layer formed on the oriented microcrystalline layer by a vapor phase growth method can be effectively used. It can be microcrystallized.
- the reason why the light emitting layer is microcrystallized in this way is considered to be that the light emitting layer is microcrystallized according to the crystal size of the oriented microcrystalline layer which is the underlayer.
- a light emitter according to the invention of claim 2 is formed on the light emitting layer forming substrate of claim 1 and the oriented microcrystalline layer of the light emitting layer forming substrate by a vapor phase growth method as necessary. Vapor phase growth of an intermediate layer formed of a nitride semiconductor, and on the intermediate layer when the intermediate layer is formed, or on the oriented microcrystalline layer when the intermediate layer is not formed.
- a phosphor according to the first aspect wherein an intermediate layer made of a nitride semiconductor is vapor-phase grown on the oriented microcrystalline layer of the light emitting layer forming substrate according to the first aspect.
- the intermediate layer is made of a nitride semiconductor containing a nuclear material that becomes a starting point when the light emitting layer grows. For this reason, when it is difficult to grow a light emitting layer on an oriented microcrystalline layer, it is preferable to first form an intermediate layer on the oriented microcrystalline layer and then form a light emitting layer on this intermediate layer. On the other hand, when the light emitting layer can be easily grown on the oriented microcrystalline layer, the light emitting layer may be formed directly on the oriented microcrystalline layer without forming an intermediate layer. However, even when the light emitting layer can be easily grown on the oriented microcrystalline layer, an intermediate layer may be formed on the oriented microcrystalline layer, and the light emitting layer may be formed on this intermediate layer. Of course.
- the intermediate layer preferably has a larger pandgap energy than the light emitting layer. Since the light emitting layer is formed on the intermediate layer having a larger Pandgap energy than the light emitting layer to form a laminated state, movement of electrons from the light emitting layer to the intermediate layer can be avoided. As a result, a light emitter having a quantum confinement effect can be obtained, and the light emission efficiency can be effectively improved.
- the intermediate layer having a larger pand gap energy than the light emitting layer generally has a lower refractive index than the light emitting layer.
- a light emitting layer is formed on an intermediate layer having a refractive index smaller than that of the light emitting layer to form a laminated state, thereby preventing light from moving from the light emitting layer to the intermediate layer.
- the light emitted from the light emitting layer can remain in the light emitting layer for a longer time, and the lifetime of light emission can be extended.
- the thickness of the intermediate layer is preferably 5 to 500 nm. In consideration of the confinement effect, if the intermediate layer is too thin, the confinement effect cannot be obtained sufficiently. On the other hand, if the intermediate layer is too thick, it is difficult to crystallize the light emitting layer. From this viewpoint, it is more preferable that the thickness of the intermediate layer is 10 to 100 nmm.
- the light emitting layer is composed of fine crystal grains having an average particle diameter of 1 to 100 nm.
- the light emitting layer composed of such fine crystal grains is formed on the light emitting layer forming substrate in a form in which each light emitting layer is independently distributed in a dot shape. For light emitting layer formation, some light emitting layers are adjacent to each other. It may be formed on a substrate.
- the average grain size of the microcrystalline grains constituting the light emitting layer is less than 1 nm, it is difficult to form at this stage. Further, if the average grain size of the microcrystalline grains constituting the light emitting layer is too small, there is a possibility that a desired light emission amount cannot be obtained due to insufficient volume of the light emitting layer. On the other hand, if the average grain size of the microcrystalline grains constituting the light emitting layer exceeds l O O O nm, the light emitting efficiency of the light emitting layer cannot be effectively improved. From this point of view, the average grain size of the microcrystalline grains constituting the light emitting layer is preferably 5 to 500 nm, and more preferably 5 to 200 nm.
- the light emitting layer is composed of the fine crystal grains, the light emission efficiency can be effectively improved by microcrystallization of the light emitting layer.
- the light emitting layer is formed by a vapor phase growth method, there is no problem that the crystal quality is deteriorated due to blackening due to nitrogen deficiency.
- the vapor phase growth method it is easy to control the supply of raw materials, so that it is possible to control the production of mixed crystals and the concentration of impurities, and to improve color rendering and luminous efficiency.
- the single crystal base material is a silicon base material
- composition ratio in the light emitting layer can be variously set according to the required emission wavelength. Further, the composition ratio in the intermediate layer can be variously set so as to include a nuclear material that is a starting point when the light emitting layer formed on the intermediate layer grows, but the band gap is larger than that of the light emitting layer. It is preferable to set as follows.
- the light emitting layer is suitable. It is preferable that impurities (for example, suitable for improving the emission intensity) are included.
- impurities for example, suitable for improving the emission intensity
- a light-emitting layer containing donor impurities such as Si, O, and C and acceptor impurities such as Zn, Mg, and C can obtain light emission from a donor-acceptor pair. According to the light emitting layer containing both the donor impurity and the acceptor impurity, the emission intensity can be remarkably increased and a broad emission wavelength can be obtained. Note that if the impurity concentration in the light emitting layer is too low, the probability of light emission by the donor-acceptor pair decreases.
- the impurity concentration in the light emitting layer is too high, defects are generated in the crystal of the light emitting layer, and non-luminescent centers are generated. As a result, the light emission intensity decreases. For this reason, it is preferable that both the donor impurity and the acceptor impurity are contained in each microcrystal grain constituting the light emitting layer at a predetermined concentration. Note that the optimum concentration range of impurities in the light emitting layer varies depending on the composition ratio of the light emitting layer as a base material.
- the light emitter according to the invention of claim 2 further includes a cladding layer formed on the light emitting layer by a vapor phase growth method and made of a nitride semiconductor having a larger pandgap energy than the light emitting layer. It is preferable to have it.
- a clad layer having a bandgap energy larger than that of the light emitting layer is formed on the light emitting layer to form a laminated state, so that movement of electrons from the light emitting layer to the cladding layer can be avoided. As a result, a light emitter having a quantum confinement effect can be obtained, and the light emission efficiency can be effectively improved.
- a cladding layer having a larger pand gap energy than the light emitting layer generally has a lower refractive index than the light emitting layer. For this reason, a clad layer having a refractive index smaller than that of the light emitting layer is formed on the light emitting layer to form a laminated state, thereby preventing light from moving from the light emitting layer to the cladding layer. As a result, the light emitted from the light emitting layer can remain in the light emitting layer for a longer time, and the life of the light emission can be extended.
- the band gap energy is larger than that of the light emitting layer, and the refractive index is between the intermediate layer and the cladding layer. Since the light-emitting layer is sandwiched, the electron and light are more effective. As a result, it is possible to remain in the light emitting layer, and it is possible to more effectively achieve the improvement of the light emission efficiency and the extension of the light emission life.
- the thickness of the cladding layer is preferably 5 to 50 Onm. In consideration of the confinement effect, if the cladding layer is too thin, the confinement effect cannot be obtained sufficiently. On the other hand, if the thickness of the cladding layer is too thick, the electron beam transmittance in the cladding layer is lowered. From this point of view, the clad layer is more preferably 10 to 10 Onm.
- the cladding layer is preferably formed so as to completely cover the light emitting layer. By doing so, the light emitting layer can be reliably protected by the cladding layer.
- the intermediate layer, the light emitting layer, and the cladding layer are all formed by vapor deposition.
- the conditions of this vapor phase growth method are not particularly limited, but a metal organic vapor phase growth method (MOC VD method) using a predetermined organic metal as a raw material can be suitably used.
- MOC VD method metal organic vapor phase growth method
- the luminescent material according to the invention described in claim 7 is peeled off from the substrate for forming the light emitting layer of the light emitter described in claim 6, and includes the intermediate layer, the light emitting layer, and the cladding layer. It is characterized by.
- This light-emitting substance has a laminated state in which a light-emitting layer is sandwiched between an intermediate layer and a clad layer having a bandgap energy larger than that of the light-emitting layer and a low refractive index. Therefore, according to this luminescent substance, electrons and light can be more effectively retained in the luminescent layer, and it is possible to more effectively achieve improvement in luminous efficiency and longer life of luminescence. It becomes.
- a method for removing the light emitting material including the intermediate layer, the light emitting layer, and the cladding layer from the light emitting layer forming substrate is not particularly limited, and for example, wet etching or dry etching can be used.
- the light emitter according to claim 2 having a light emitting layer made of fine crystal grains, or the light emitting layer made of fine crystal grains is sandwiched between an intermediate layer and a cladding layer.
- the luminescent substance according to the invention is used for plasma displays, fluorescent lamps, etc. as a fluorescent material that emits light when excited by an electron beam or ultraviolet light. Can be.
- the luminescent material according to the invention of claim 7 is not formed on an Si substrate or the like that absorbs visible light and decreases luminous efficiency, it can be applied as a fluorescent material that emits light by visible light. is there.
- the substrate for forming a light emitting layer according to the invention described in claim 8 is a single crystal substrate of Si, and a light emitting layer made of a nitride semiconductor is formed on the single crystal substrate by a vapor phase growth method. It is formed by.
- the single crystal substrate is made of S i.
- the shape and size of the single crystal base material are not particularly limited, and can be set as appropriate.
- the substrate for forming a light emitting layer is formed by finely processing the surface of a single crystal substrate.
- the average length of the longest part is 1 to 100 nm.
- (Nil) S i-plane part (where n is an integer from 0 to 6).
- the (nil) Si surface portion has n of 0, 1, 2, 3, 4, 5, or 6, that is, (Oil) Si surface portion, (1 1 1) Si surface portion, (2 1 1) Si surface portion, (3 1 1) Si surface portion, (4 1 1) Si surface portion, (5 1 1) Si surface portion or (6 1 1) Si surface portion.
- the average length of the longest portion is 1 to 10 O O nm.
- the average length of the longest part of the (n i l) S i surface part is less than 1 nm, it is difficult to form an intermediate layer or a light emitting layer on the (n i l) Si face part.
- the average length of the longest part of the (nil) Si surface exceeds l OOO nm, microcrystallization will occur in the intermediate layer and the light emitting layer formed on the (nil) Si surface. Becomes difficult.
- the average length of the longest part of the (n i l) S i surface part is preferably 5 to 500 nm, and more preferably 5 to 200 nm.
- the average of the crystal grain sizes of the crystals constituting the light emitting layer formed directly or directly on the (nil) Si surface portion is the (nil) Si surface portion of the longest portion of the (nil) Si surface portion.
- the average length is 1 to 1 00 00 nm, it can be about 1 to 1 00 0 0 n in, and the average length of the longest part of the (nil) Si plane is 5 to 5 OO In the case of nm, it can be about 5 to 500 nm, and the average length of the longest part of the (nil) Si surface is 5 to 2 OO nm In this case, the thickness can be about 5 to 200 nm.
- the light emitting layer formed on the (nil) Si surface portion by vapor phase epitaxy Can be effectively microcrystallized.
- the reason why the light emitting layer is microcrystallized in this way is thought to be because the crystal grows only on the (n i l) S i plane part, and the size of this crystal is determined by the size of the (n i l) S i plane part.
- each (n 1 1) Si surface is as uniform as possible. If the size of each (n i l) S i surface is uniform, each (n 1
- a method for forming the (n 1 1) Si surface portion is not particularly limited. However, in order to form the (n 1 1) Si surface by finely processing the surface of the Si substrate, it is necessary to finely process the Si surface other than (1 1 1) Si surface. .
- the (0 0 1) S i surface or the (O il) S i surface can be replaced with KOH (hydroxylation power lithium) or TMAH (tetramethylammonium hydroxide), (CH 3 ) 4
- KOH hydroxylation power lithium
- TMAH tetramethylammonium hydroxide
- Si surface portion can be formed.
- (nil) Si surface is formed by anisotropic etching, by adjusting the immersion time in the anisotropic etching solution, the temperature and concentration of the anisotropic etching solution, (n 1 1)
- the size of the Si plane can be controlled.
- the light emitter according to the invention of claim 9 is a vapor-phase growth, if necessary, on the light emitting layer forming substrate according to claim 8 and the (nil) Si surface portion of the light emitting layer forming substrate.
- An intermediate layer made of a nitride semiconductor formed by the method, and when the intermediate layer is formed, on the intermediate layer, and when the intermediate layer is not formed, the (nil) Si surface portion A light emitting layer made of a nitride semiconductor formed by a vapor deposition method, and a cladding layer made of a nitride semiconductor formed by a vapor deposition method on the light emitting layer as necessary. Have Is.
- the light emitter according to the invention described in claim 9 is configured such that an intermediate layer made of a nitride semiconductor is formed on the (nil) Si surface portion of the substrate for forming a light emitting layer according to claim 8 as necessary.
- An intermediate layer forming step formed by a phase growth method; and when the intermediate layer is formed, on the intermediate layer, and when the intermediate layer is not formed, nitriding on the (nil) Si surface portion
- the intermediate layer is made of a nitride semiconductor containing a nuclear material that becomes a starting point when the light emitting layer grows. For this reason, when it is difficult to grow a light emitting layer on the (nil) Si surface portion, an intermediate layer is first formed on the (nil) Si surface portion, and a light emitting layer is formed on the intermediate layer. preferable. on the other hand,
- the light emitting layer may be formed directly on the (n i l) S i surface portion without forming the intermediate layer.
- an intermediate layer is formed on the (nil) Si surface portion, and the light emitting layer is formed on this intermediate layer.
- a light-emitting layer containing Ga is formed directly on the (nil) Si surface, Si reacts at a high temperature, causing Si to corrode and appear on the surface of the Si substrate. Micron-order holes are formed.
- the intermediate layer has a larger band gap energy than the light emitting layer. Since the light emitting layer is formed on the intermediate layer having a larger Pandgap energy than the light emitting layer to form a laminated state, movement of electrons from the light emitting layer to the intermediate layer can be avoided. As a result, a light emitter having a quantum confinement effect can be obtained, and the light emission efficiency can be effectively improved. In addition, it has a larger band gap energy than the light emitting layer.
- the interlayer generally has a lower refractive index than the light emitting layer.
- a light emitting layer is formed on an intermediate layer having a refractive index smaller than that of the light emitting layer to form a laminated state, thereby preventing light from moving from the light emitting layer to the intermediate layer.
- the light emitted from the light emitting layer can remain in the light emitting layer for a longer time, and the lifetime of light emission can be extended.
- the thickness of the intermediate layer is preferably 5 to 500 nm. In consideration of the confinement effect, if the intermediate layer is too thin, the confinement effect cannot be obtained sufficiently. On the other hand, if the intermediate layer is too thick, it is difficult to crystallize the light emitting layer. From this viewpoint, it is more preferable that the thickness of the intermediate layer is 10 to 100 nmm.
- the light emitting layer is composed of fine crystal grains having an average particle diameter of 1 to 100 nm.
- the light emitting layer composed of such fine crystal grains is formed on the light emitting layer forming substrate in a form in which each light emitting layer is independently distributed in a dot shape.
- some light emitting layers may be formed on the base material for light emitting layer formation with the form which adjoined.
- the average grain size of the microcrystalline grains constituting the light emitting layer is less than 1 nm, it is difficult to form at this stage. Further, if the average grain size of the microcrystalline grains constituting the light emitting layer is too small, there is a possibility that a desired light emission amount cannot be obtained due to insufficient volume of the light emitting layer. On the other hand, if the average grain size of the microcrystalline grains constituting the light emitting layer exceeds l O O O nm, the light emitting efficiency of the light emitting layer cannot be effectively improved. From this point of view, the average grain size of the microcrystalline grains constituting the light emitting layer is preferably 5 to 500 nm, and more preferably 5 to 200 nm.
- the light emitting layer is composed of the fine crystal grains, the light emission efficiency can be effectively improved by microcrystallization of the light emitting layer.
- the light emitting layer is formed by a vapor phase growth method, there is no problem that the crystal quality is deteriorated due to blackening due to nitrogen deficiency.
- the vapor phase growth method it is easy to control the raw material supply, so it is possible to control the production of mixed crystals and the concentration of impurities, Color rendering and luminous efficiency can be improved.
- the kind of the single crystal base material and the composition of the intermediate layer and the light emitting layer are not particularly limited as long as each of them can perform a predetermined function, and various combinations are possible.
- the single crystal base material is a silicon base material
- composition ratio in the light emitting layer can be variously set according to the required emission wavelength. Further, the composition ratio in the intermediate layer can be variously set so as to include a nuclear material that is a starting point when the light emitting layer formed on the intermediate layer grows, but the band gap is larger than that of the light emitting layer. It is preferable to set as follows.
- the light emitting layer preferably contains an appropriate impurity (for example, appropriate for improving the light emission intensity).
- an appropriate impurity for example, appropriate for improving the light emission intensity.
- a light-emitting layer containing donor impurities such as Si, O, and C and acceptor impurities such as Zn, Mg, and C can obtain the light emission of the donor-acceptor pair.
- donor impurities such as Si, O, and C
- acceptor impurities such as Zn, Mg, and C
- both the donor impurities and the acceptor impurities are contained at a predetermined concentration in each microcrystal grain constituting the light emitting layer.
- the optimum concentration range of impurities in the light emitting layer varies depending on the composition ratio of the light emitting layer as a base material.
- the light emitter according to the invention of claim 9 is formed on the light emitting layer by a vapor phase growth method, and has a larger pand gap energy than the light emitting layer. It is preferable to further include a cladding layer made of a nitride semiconductor. A clad layer having a bandgap energy larger than that of the light emitting layer is formed on the light emitting layer so as to be laminated, so that movement of electrons from the light emitting layer to the cladding layer can be avoided. As a result, a light emitter having a quantum confinement effect can be obtained, and the light emission efficiency can be effectively improved.
- a cladding layer having a band gap energy larger than that of the light emitting layer generally has a lower refractive index than that of the light emitting layer. For this reason, a clad layer having a refractive index smaller than that of the light emitting layer is formed on the light emitting layer to form a laminated state, so that movement of light from the light emitting layer to the cladding layer can be avoided. As a result, the light emitted from the light emitting layer can remain in the light emitting layer for a longer time, and the life of the light emission can be extended.
- the intermediate layer is formed on the (nil) Si surface
- the light emitting layer is sandwiched between the intermediate layer and the cladding layer having a larger gap energy than the light emitting layer and having a low refractive index. Since it is in a laminated state, electrons and light can remain in the light emitting layer more effectively, and it becomes possible to more effectively achieve improvement in light emission efficiency and longer life of light emission.
- the thickness of the cladding layer is preferably 5 to 500 nm. In consideration of the confinement effect, if the cladding layer is too thin, the confinement effect cannot be obtained sufficiently. On the other hand, if the thickness of the cladding layer is too thick, the electron beam transmittance in the cladding layer is lowered. From this point of view, the cladding layer is more preferably 10 to 10 Onm.
- the cladding layer is preferably formed so as to completely cover the light emitting layer. By doing so, the light emitting layer can be reliably protected by the cladding layer.
- the intermediate layer, the light emitting layer, and the cladding layer are all formed by vapor deposition.
- the conditions of this vapor phase growth method are not particularly limited, but a metal organic vapor phase growth method (MOC VD method or MOVPE method) using a predetermined organic metal as a raw material can be suitably used.
- the luminescent material according to the invention described in claim 14 is the light emitting material described in claim 13.
- the light body is peeled from the light emitting layer forming base material, and includes the intermediate layer, the light emitting layer, and the cladding layer.
- This light-emitting substance has a laminated state in which a light-emitting layer is sandwiched between an intermediate layer and a clad layer having a band gap energy larger than that of the light-emitting layer and a low refractive index. For this reason, according to this luminescent material, electrons and light can remain in the light emitting layer more effectively, and it is possible to improve the light emission efficiency and extend the life of light emission more effectively. It becomes.
- a method of peeling the light emitting material including the intermediate layer, the light emitting layer, and the cladding layer from the light emitting layer forming substrate is not particularly limited.
- wet etching can be used for dry etching. .
- the light emitter according to the invention of claim 9 having a light emitting layer made of fine crystal grains, or the light emitting layer made of fine crystal grains sandwiched between an intermediate layer and a clad layer.
- the light-emitting substance according to the described invention can be used for a plasma display or a fluorescent lamp as a fluorescent material that emits light by excitation with an electron beam or ultraviolet rays.
- the luminescent substance according to the invention described in claim 14 is not formed on an Si substrate or the like that absorbs visible light and decreases luminous efficiency, it can be applied as a fluorescent material that emits light by visible light. It is. Examples of the present invention will be specifically described below.
- the first embodiment embodies the invention according to claims 1 to 7.
- the light emitting layer forming base material 4 according to this example shown in the schematic cross-sectional view of FIG. 1 (c) is formed on a single crystal base material 1 made of a single crystal substrate of S i and on the single crystal base material 1. And an oriented microcrystalline layer 3 having a thickness of about 100 nm.
- the crystal axis of each crystal constituting the oriented microcrystalline layer 3 is oriented in a specific direction with respect to the single crystal substrate 1. Specifically, the c-axis of each crystal constituting the oriented microcrystalline layer 3 is oriented in a direction perpendicular to the single crystal substrate 1. In the oriented microcrystalline layer 3, the c-axis of about 50% or more of the crystals constituting the oriented microcrystalline layer 3 is relative to the single crystal substrate 1. Oriented in the vertical direction.
- the oriented microcrystalline layer 3 has an average crystal grain size of about 50 nm of the crystals constituting the oriented microcrystalline layer 3.
- the light emitter 8 includes the light emitting layer forming substrate 4 and the oriented microcrystalline layer 3 of the light emitting layer forming substrate 4.
- Each of the light emitting layers 6 includes a plurality of cladding layers 7 made of a nitride semiconductor and formed by vapor phase epitaxy.
- the intermediate layer 5 has a composition formula of A 1 N and includes A 1 as a nuclear material that is a starting point when the light emitting layer 6 is grown. Further, the intermediate layer 5 has a larger pand gap energy than the light emitting layer 6 and a refractive index smaller than that of the light emitting layer 6. The thickness of the intermediate layer 5 is about 10 nm.
- the light emitting layer 6 has a composition formula of G a N.
- Each light emitting layer 6 is composed of a single fine crystal grain having an average grain size of 1 50 nm. Most of the light emitting layers 6 are separated from adjacent light emitting layers 6.
- Each light-emitting layer 6 contains Si as a donor impurity at a concentration of 8.0 X 1 0 18 / cm 3 , and Zn as an acceptor impurity is 4.0 X 1 0 1 cm. Contains at a concentration of 3 .
- the cladding layer 7 has a composition formula of A 1 N.
- the clad layer 7 has a band gap energy larger than that of the light emitting layer 6 and a refractive index smaller than that of the light emitting layer 6.
- the cladding layer 7 is formed with a thickness of 10 nm so as to cover the entire light emitting layer 6.
- the luminescent material 9 according to this example shown in the schematic cross-sectional view of FIG. 1 (g) is peeled off from the luminescent layer forming substrate 4 of the luminescent material 8, and the intermediate layer 5 and the luminescent material are separated. It is composed of a layer 6 and the cladding layer 7.
- This luminescent substance 9 ⁇ has a larger Pandgap energy than the luminescent layer 6,
- the light emitting layer 6 is sandwiched between the intermediate layer 5 and the cladding layer 7 having a low refractive index.
- the average particle size of the luminescent material 9 is set to 100 to 200 nm.
- the substrate 4 for forming a light emitting layer, the light emitter 8 and the light emitting substance 9 according to this example having such a configuration were manufactured as follows.
- a single crystal substrate 1 made of a single crystal substrate of S i was prepared (see Fig. 1 (a)).
- the single crystal substrate 1 has a (1 1 1) Si surface that is chemically polished, and has a surface roughness expressed by a mean square height of 0.1 nm or less.
- a polycrystalline layer having a thickness of approximately 100 nm is formed by sputtering ZnO in an Ar atmosphere of approximately 6 mTorr on the (1 1 1) Si surface of the single crystal substrate 1. 2 was formed on the single crystal substrate 1 (see FIG. 1 (b), polycrystalline layer forming step).
- the single crystal base material 1 on which the polycrystalline layer 2 is formed is put in a quartz tube (not shown), and annealed under conditions of N 2 atmosphere, 80 ° C., 30 minutes, so that the polycrystalline layer 2 Is the oriented microcrystalline layer 3 (see FIG. 1 (c), surface modification treatment step).
- a light emitting layer forming base material 4 according to the present example comprising the single crystal base material 1 and the oriented microcrystalline layer 3 formed on the single crystal base material 1 was produced.
- an intermediate layer forming step, a light emitting layer forming step, and a cladding layer forming step using the MOVPE method shown below were successively performed on the obtained light emitting layer forming substrate 4.
- the intermediate layer 5 was formed on the oriented microcrystalline layer 3 of the light emitting layer forming substrate 4 by the MOVPE method performed under the following conditions (see FIG. 1 (d)).
- Substrate temperature 1 2 0 0 ° C
- TMA 1 supply 2 ⁇ m o 1 / m i n
- the light emitting layer 6 containing Si and Zn at a predetermined concentration was formed on the intermediate layer 5 by performing the MOVPE method under the following conditions continuously with the intermediate layer forming step (FIG. 1). (See (e)).
- Substrate temperature 1 0 5 0 ° C
- the cladding layer 7 was formed on the light emitting layer 6 by performing the MOVPE method under the following conditions continuously with the light emitting layer forming step (see FIG. 1 (f)).
- Substrate temperature 1 0 5 0 ° C
- TMA 1 supply 2 ⁇ m o 1 / m i n
- the light emitting layer forming substrate 4, the intermediate layer 5 formed on the oriented microcrystalline layer 3 of the light emitting layer forming substrate 4, and the intermediate layer 5 were formed.
- the substrate for forming a light emitting layer 13 is composed of a single crystal substrate 11 made of a Si single crystal substrate. It has a plurality of (1 1 1) Si face portions 12 formed by finely processing (anisotropic etching treatment) the surface of the crystal substrate 11.
- Each (1 1 1) Si surface portion 1 2 has an average length of the longest portion of 1 50 nm.
- the light emitter 17 includes the light emitting layer forming base material 13 and the light emitting layer forming base material 13 (1 1 1)
- the light-emitting layer 15 includes a plurality of light-emitting layers 15 made of a nitride semiconductor, and a plurality of cladding layers 16 made of a nitride semiconductor and formed on each light-emitting layer 15 by a vapor deposition method.
- the intermediate layer 14 has a composition formula of A 1 N and includes A 1 as a nuclear material that is a starting point when the light emitting layer 15 grows. Further, the intermediate layer 14 has a band gap energy larger than that of the light emitting layer 15 and a refractive index smaller than that of the light emitting layer 15. The thickness of the intermediate layer 14 is about 10 nm.
- the light emitting layer 15 has a composition formula of G a N.
- Each light emitting layer 15 is composed of a single fine crystal grain having an average grain size of 1550 nm.
- most of the light emitting layers 15 are independent from the adjacent light emitting layers 15.
- Each light-emitting layer 15 has Si as a donor impurity of 8.0 X 1 0 1 It is contained at a concentration of 8 / cm 3 , and Zn as an acceptor impurity is contained at a concentration of 4.0 X 10 1 9 / cm 3 .
- the cladding layer 16 has a composition formula of A 1 N.
- the clad layer 16 has a bandgap energy larger than that of the light emitting layer 15 and a refractive index smaller than that of the light emitting layer 15.
- the cladding layer 16 is formed with a thickness of 10 nm so as to cover the entire light emitting layer 15.
- the luminescent material 18 according to the present example shown in the schematic cross-sectional view of FIG. 2 (f) is peeled off from the luminescent layer forming substrate 13 of the luminescent material 17 so that the intermediate layer 1 4, the light emitting layer 15, and the cladding layer 16.
- This luminescent material 18 has a layered state in which the luminescent layer 15 is sandwiched between the intermediate layer 14 and the cladding layer 16 having a bandgap energy larger than that of the luminescent layer 15 and a low refractive index. It is said that.
- the average particle diameter of the luminescent material 18 is set to 100 to 20 O nm.
- the substrate 13 for forming a light emitting layer, the light emitter 17 and the light emitting material 18 according to this example having such a configuration were manufactured as follows.
- a single crystal substrate 11 made of a single crystal substrate of S i was prepared (see Fig. 2 (a)).
- This single crystal base material 11 has a surface to be processed that has not been polished, and has a surface roughness expressed by a mean square height of 25 nm. (0 0 1) Si surface 1 1 has a.
- the (0 0 1) Si surface ila is finely added to the single crystal base material 11 by subjecting the single crystal base material 11 to anisotropic etching under the following conditions, and the (1 1 1) Si face 12 was formed (see Fig. 2 (b)).
- Type of anisotropic etching solution KOH aqueous solution
- Anisotropic etching solution temperature 40 ° C—Constant (about 2 ° C soil)
- the light emitting layer forming base material 13 according to the present example having a plurality of (1 1 1) Si face portions 12 was manufactured from the Si single crystal base material 11.
- the intermediate layer forming step, the light emitting layer forming step, and the cladding layer forming step using the MOVPE method shown below were continuously performed on the obtained light emitting layer forming base material 13. .
- MOVPE methods as in Example 1, TM In was used as the source of In, TMA 1 was used as the source of A 1, TMG a was used as the source of Ga, N NH 3 was used as the supply source, DEZ n was used as the Z n supply source, and MMS i was used as the S i supply source.
- TM In was used as the source of In
- TMA 1 was used as the source of A 1
- TMG a was used as the source of Ga
- N NH 3 was used as the supply source
- DEZ n was used as the Z n supply source
- MMS i was used as the S i supply source.
- the intermediate layer 14 was formed on the (1 1 1) Si surface portion 12 of the light emitting layer forming base material 13 by the MOVPE method performed under the following conditions (see FIG. 2 (c)). .
- Substrate temperature 1 2 0 0 ° C
- TMA 1 supply 2 ⁇ m 0 1 / m i n
- the light emitting layer 15 containing Si and Zn at a predetermined concentration was formed on the intermediate layer 14 by performing a MOVPE method under the following conditions. (See Figure 2 (d)).
- Substrate temperature 1 0 50 0 ° C
- the cladding layer 16 was formed on the light emitting layer 15 by performing the MOVPE method under the following conditions in succession to the light emitting layer forming step (FIG. 2). (See (e)).
- Substrate temperature 1 0 50 ° C
- TMA 1 supply 2 m o 1 / m i n
- the monolith of the clad layer 16 was peeled off to obtain the luminescent material 18 according to the present embodiment consisting of the intermediate layer 14, the luminescent layer 15, and the clad layer 16 (see FIG. 2 (f See)).
- a (1 1 1) Si substrate was prepared as a single crystal substrate. Then, using the MOVPE method, a G a N template layer, an A 1 N buffer layer, and an In G a N light emitting layer were formed in this order on a (1 1 1) Si substrate. At this time, the Zn concentration and the Si concentration contained in the InGaN emission layer can be changed by variously changing the supply amounts of Zn and Si when forming the InGaN emission layer.
- Z n 0.34 X 1 0 1 9 / cm 3 to 9.2 X 10 1 9 / cm 3
- S i 2.3 XI 0 18 / cm 3 to 9.2 X 1 0 18 / cm 3 and made various changes. These Zn and Si concentrations were measured by SIMS (Sonicndary Ionization Mass Spectrometer).
- TM In is used as the source of In
- TMA 1 is used as the source of A 1
- TMG a is used as the source of Ga
- N NH 3 is used as source
- DEZ as source of Zn n
- MMS i was used as the source of S i.
- the thickness of the G a N template layer is 20 nm, and the thickness of the A 1 N buffer layer is 50 nm.
- I n G a N-emitting layer has a thickness of 2 0 0 nm, and has a composition formula of I n 0. 1 G a 0. 9 N.
- Figure 3 shows the CL (Cathodoliminescence) spectrum (room temperature) of the In G a N emission layer when the Si concentration is constant at 4.6 X 10 18 cm 3 and the ⁇ concentration is varied. ).
- the CL spectrum of the InGaN emission layer doped only with Si has a peak wavelength of 400 nm.
- the peak wavelength of the CL spectrum of the InGaN emission layer shifted to 48.2 nm.
- the In G a N light emitting layer doped with S i: 4.6 X 1 0 1 8 / cm 3 and Z n: 4.0 X 1 0 1 9 / cm 3 only S i is doped. Compared to the case, the emission intensity is 5 times.
- doping Zn together with S i broadens the spectrum and provides a broad emission wavelength.
- FIG. 4 shows the emission intensity of the InGaN emission layer when the Si concentration is constant at 4.6 ⁇ 10 18 / cm 3 and the Zn concentration is variously changed.
- FIG. 5 shows the emission intensity of the InGaN emission layer when the Zn concentration is constant at 4.0 X 10 0 19 / cm 3 and the Si concentration is variously changed. From FIG. 4 and FIG. 5, the emission intensity increased by doping Zn and Si. That is, the composition formula is 1 1.
- Si is included as a donor impurity at a concentration of 4.6 X 1 0 1 8 / cm 3 to 9.2 X 1 0 1 8 / cm 3
- Zn is contained as an acceptor impurity at a concentration of 2 X 10 19 / cm 3 to 8 X 10 19 cm 3
- the emission intensity can be effectively increased.
- S i is included at a concentration of 8 X 1 0 1 8 / cm 3
- Zn is at a concentration of 4 X 1 0 1 9 / cm 3
- 9 N emission layer has the highest emission intensity and contains only Si at a concentration of 4.6 X 10 0 18 / cm 3 .
- the emission intensity of the 9 N emission layer was 23 to 3 times.
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US9012253B2 (en) | 2009-12-16 | 2015-04-21 | Micron Technology, Inc. | Gallium nitride wafer substrate for solid state lighting devices, and associated systems and methods |
US8129205B2 (en) * | 2010-01-25 | 2012-03-06 | Micron Technology, Inc. | Solid state lighting devices and associated methods of manufacturing |
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JP2002246697A (ja) * | 2000-12-15 | 2002-08-30 | Nobuhiko Sawaki | 半導体レーザ素子およびその製造方法 |
JP2002246646A (ja) * | 2000-12-15 | 2002-08-30 | Nobuhiko Sawaki | 半導体素子およびその製造方法ならびに半導体基板の製造方法 |
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- 2006-08-24 WO PCT/JP2006/317157 patent/WO2007024017A1/ja active Application Filing
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Also Published As
Publication number | Publication date |
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JP2007056164A (ja) | 2007-03-08 |
US20090250711A1 (en) | 2009-10-08 |
CN101248536A (zh) | 2008-08-20 |
DE112006002192T5 (de) | 2008-06-12 |
US8338853B2 (en) | 2012-12-25 |
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