摘要:
A light-emitting apparatus composed of a light source that emits primary light and a phosphor that absorbs the primary light and emits secondary light offers high brightness, low power consumption, and a long lifetime while minimizing adverse effects on the environment. The phosphor is formed of a III-V group semiconductor in the form of fine-particle crystals each having a volume of 2 800 nm3 or less. The light emitted from the fine-particle crystals depends on their volume, and therefore giving the fine-particle crystals a predetermined volume distribution makes it possible to adjust the wavelength range of the secondary light.
摘要:
A light emitting device includes a light emitting element having an emission peak wavelength of 350 nm-420 nm and a phosphor absorbing light from this light emitting element and emitting fluorescence having a different emission peak wavelength. The phosphor is formed of a semiconductor material that allows the emission peak wavelength to be controlled by transition across the bandgap, and is configured with four or more fluorescences having different emission peak wavelengths. Thus, it is possible to provide a light emitting device which has a relatively simple structure to keep high theoretical efficiency limit and achieves good general color rendering index (Ra) and special color rendering index (R9).
摘要:
A light-emitting apparatus composed of a light source that emits primary light and a phosphor that absorbs the primary light and emits secondary light offers high brightness, low power consumption, and a long lifetime while minimizing adverse effects on the environment. The phosphor is formed of a III-V group semiconductor in the form of fine-particle crystals each having a volume of 2 800 nm3 or less. The light emitted from the fine-particle crystals depends on their volume, and therefore giving the fine-particle crystals a predetermined volume distribution makes it possible to adjust the wavelength range of the secondary light.
摘要:
A substrate-type LED light source (10) includes: at least one blue LED chip (2) which has an emission peak in a range from 400 nm to 480 nm so as to correspond to a blue light region absorption peak of chlorophyll; a red phosphor (7b) which emit, upon receiving excitation light from the at least one blue LED chip (2), light having a peak wavelength in a range from 620 nm to 700 nm so as to correspond to a red light region absorption peak of chlorophyll; and a resin layer (7) in which the red phosphor 7b is dispersed and which covers the at least one blue LED chip (2).
摘要:
A light-emitting device including a light-emitting element emitting excitation light for exciting a fluorescent body, a dispersion body having the fluorescent body dispersed therein, which fluorescent body emits fluorescent light having a wavelength different from that of the excitation light, and a lead frame holding the light-emitting element and the dispersion body, wherein at least a portion of the fluorescent light emitted from the fluorescent body in the dispersion body is output to the outside from a side of the dispersion body receiving the excitation light. With this, a light-emitting device having high light output efficiency and an illumination apparatus and a display apparatus using the light-emitting device are provided.
摘要:
The integrated optical control element of this invention includes: a first waveguide for allowing light incident from outside to propagate therein; a multilayer structure for allowing the light which has propagated in the first waveguide to be incident thereon and for transmitting the light therethrough or reflecting the light therefrom, the multilayer structure including at least one layer having a refractive index different from an equivalent refractive index of a region with which the at least one layer is in contact; and a second waveguide for receiving at least part of the light transmitted through or reflected from the multilayer structure.
摘要:
A spatial coherent light transmission apparatus according to the present invention, includes: a light transmitter for emitting a data signal as first coherent light; a light receiver for emitting second coherent light having a wavelength little different from that of The first coherent light, mixing and receiving the first and second coherent lights, and performing a coherent detection of the data signal. At least one of the light transmitter and the light receiver has a detection device for detecting at least one of a coherent light transmission state and a coherent light detection state. The apparatus further includes a control device for controlling at least one of the light transmitter and the light receiver based on information of the state detected by the detection device.
摘要:
A method for optically reading recorded information by radiating laser light emitted from a semiconductor laser which oscillates in a single longitudinal mode to an information recording medium and by detecting laser light reflected from a recording face of the information recording medium is disclosed. In the method, the optical frequency of the laser light is modulated in order that the modulated optical frequency is a periodic function dependent on time, and the absolute value of a time differential coefficient R (Hz/s) of the periodic function, a spectral line width .delta. .nu. (Hz) of the laser light, and a time period .tau. (s) from the time when the laser light is emitted to the time when the laser light reflected from the recording face of the information recording medium reaches the semiconductor laser satisfy the condition of R.gtoreq..delta. .nu./.tau.. The periodic function varies to have a sawtooth waveform or a triangular waveform.
摘要:
A semiconductor laser device includes a substrate and a laminated structure formed on a top face of the substrate. The laminated structure includes (a) first and second guide layers and (b) a quantum well structure of compound semiconductor interposed between the first and second guide layers. The quantum well structure serves as a resonator of the device and includes at least one quantum well layer and at least one barrier layer. The quantum well layer has a thickness L.sub.z and the barrier layer has the energy gap larger than the energy gap of the quantum well layer so as to form a energy difference V.sub.0 between the bottom of the conduction band of the quantum well layer and the bottom of the conduction band of the barrier layer. The relationship represented by formula (I) is satisfied:L.sub.z
摘要:
A semiconductor laser device of the present invention includes: a semiconductor substrate having a top face and a bottom face; a multi-layered structure formed on the top face of the semiconductor substrate, the multi-layered structure including an active layer; a stripe-shaped ridge portion which is formed on a first region of a top face of the multi-layered structure and which extends along a cavity length direction; a current blocking layer which covers both side faces of the ridge portion and a second region of the top face of the multi-layered structure; a first electrode formed at least on a top face of the ridge portion; and a second electrode formed on the bottom face of the semiconductor substrate, wherein the current blocking layer includes an insulating film and a resin film formed on the insulating film.