摘要:
The invention provides a semiconductor light emitting device whose operating voltage can be easily reduced, a method of producing the same, and an optical device. An n-type clad layer, a first guide layer, an active layer, a second guide layer, a p-type clad layer, a first semiconductor layer, and a second semiconductor layer of ZnSe are successively grown on an n-type substrate. An alkali compound layer of Na2Se is then formed thereon. Subsequently, a heat treatment is performed by means of irradiation of an excimer laser beam so that at least a part of the second semiconductor layer and at least a part of the alkali compound layer are altered thereby forming a contact layer. Furthermore, a p-side electrode is formed on the contact layer. The contact layer contains an alkali metal serving as a p-type impurity so that the contact layer has a low electric resistance thereby achieving a reduction in the operating voltage and thus a reduction in the operating power. As a result of the reduction in the operating power, the device life is improved.
摘要:
A formed article of fiber-reinforced thermoplastic resin which has been adapted for use in a sliding member by restoring the wear resistance once degraded by the addition of reinforcing fibers to the normal level is disclosed. This formed article comprises a fiber-reinforced resin material of a thermoplastic resin containing reinforcing fibers and incorporating therein additionally as a sliding property-imparting agent a material having a storage elastic modulus in the range of 3.5×108 Pa to 5.0×108 Pa in a service temperature range of 30° C. to 70° C. The ratio of incorporation of the sliding property-imparting agent is properly in the range of 4 to 10% by weight when the matrix resin is a polyamide-based resin or 4 to 20% by weight when the matrix resin is a thermoplastic resin other than the polyamide-based resin, respectively based on the total weight of the resin and the reinforcing fibers.
摘要:
The present invention provides remedies for graft-versus-host disease (GVHD) and graft rejection reactions in organ transplantation which comprise retinoic acid receptor (RAR) agonists as an active ingredient. Main examples thereof include 9-(4-methoxy-2,3,6-trimethylphenyl)-7,8-dimethylnona-2,4,6,8-tetraen-1-oic acid, 4-[(E)-2-(5,6,7,8-tetrahydro-5,5,8,8-tetramethylnaphthalen-2-yl)propenyl]benzoic acid, 4-{2-[5-(4,7-dimethylbenzofuran-2-yl)pyrroyl]}benzoic acid, 4-{2-[5-(5-chloro-7-ethylbenzofuran-2-yl)pyrrolyl]}benzoic acid and 4-{2-[5-(4,7-dimethylbenzothiophen-2-yl)pyrrolyl]}benzoic acid.
摘要:
A semiconductor light emitting device having good characteristics, high reliability and long lifetime includes a p-n junction or p-i-n junction made by locating an active layer in a position inside an n-type doped layer or p-type doped layer sufficiently distant from the depletion layer between the p-type doped layer and the n-type doped layer. When a component of intensity of light from the active layer normal to the active layer is P(x), x for its maximum value Pmax is x=0, and the range of x satisfying P(x)>Pmax/e2 is −Ln −Ln is made lower than doping concentration of the other portion of the n-type doped layer, or doping concentration of at least a part of the p-type doped layer where x
摘要:
A luminescent semiconductor device comprises: an active layer composed of a Group II-VI semiconductor device which comprises at least one Group II element selected from the group consisting of zinc, magnesium, beryllium, cadmium, manganese and mercury, and at least one Group VI element selected from the group consisting of oxygen, sulfur, selenium and tellurium. the Group II-VI compound semiconductor forming said active layer contains at least one element selected from the group consisting of magnesium, beryllium and cadmium as the Group II element and tellurium as the Group VI element. At least one antidiffusion layer preventing diffusion of these elements from the active layer is provided on at least one surface of the active layer.
摘要:
A II-VI group compound semiconductor light-emitting device can emit light of a short wavelength at room temperature. Operation characteristics, such as current--voltage characteristics and current--light output characteristics can be stabilized and a life of this semiconductor light-emitting device can be extended. The semiconductor light-emitting device comprises a substrate (1), at least a first cladding layer (2) of a first conductivity type, an active layer (3) and a second cladding layer (4) of a second conductivity type, wherein at least the active layer (3) is made of a II-VI group compound semiconductor and the active layer (3) is doped by either or both of n-type and p-type dopants.
摘要:
A surface-emitting semiconductor light emitting device comprises an n-type ZnSe buffer layer, n-type ZnSSe layer, n-type ZnMgSSe cladding layer, n-type ZnSSe waveguide layer, active layer, p-type ZnSSe waveguide layer, p-type ZnMgSSe cladding layer, p-type ZnSSe layer, p-type ZnSe contact layer, p-type ZnSe/ZnTe MQW layer and p-type ZnTe contact layer, sequentially stacked on an n-type GaAs substrate. A grid-shaped p-side electrode and a Au film convering the p-side electrode are provided on the p-type ZnTe contact layer. An n-side electrode is provided on the back surface of the n-type GaAs substrate. The active layer has a single quantum well structure or a multiple quantum structure including ZnCdSe quantum well layers.
摘要:
A semiconductor laser using II-VI compound semiconductors and capable of emitting blue to ultraviolet light is disclosed. The semiconductor laser is configured to sandwich an active layer made of a Zn.sub.x Mg.sub.1-x S.sub.y Se.sub.1-y compound semiconductor where 0.ltoreq.x
摘要翻译:公开了使用II-VI化合物半导体并能够发射蓝色至紫外光的半导体激光器。 半导体激光器被配置为夹杂由Zn x M 1-x Se y Si 1-y化合物半导体制成的有源层,其中0 / = 1的范围 ,由相对侧的n型包覆层和p型覆层形成,1.3y-3.9x> / = 1,x> / = 0和y <1。
摘要:
A semiconductor device exploiting a quantum interference effect is disclosed. The device comprises: a rod-shaped semiconductor portion extending in one direction; a prism-shaped semiconductor portion covering side faces of the rod-shaped semiconductor portion and extending in the one direction; and one or more source electrodes and one or more drain electrodes electrically connected to opposite ends of the prism-shaped semiconductor portion. Channels extend in the one direction in the prism-shaped semiconductor portion along a plurality of sides of side faces thereof. Alternatively, the prism-shaped semiconductor portion has a twisted structure about an axis extending in the one direction, and channels each having a twisted structure extend in the one direction in the prism-shaped semiconductor portion along a plurality of sides of side faces thereof.
摘要:
A method of producing a corrugated metal sheeting including a flat metal sheet and a corrugated metal sheet joined to each other, which sheeting is used to produce a carrier or honeycomb structure for carrying catalytic agents used for purifying exhaust gases from, for example, an internal combustion engine of an automobile. In the method, the flat and corrugated metal sheets are brought together so that corrugations of the corrugated metal sheet are successively brought into contact with the flat metal sheet in such a manner that the corrugated metal sheet is freely movable to thereby release resilient stresses therefrom, and a laser beam is incident on a contact line between the flat metal sheet and each of the corrugations of the corrugated metal sheet, to thereby weld them to each other.