Abstract: The present invention provides a white light source comprising: a light emitting diode (LED) having a light emission peak wavelength in a range of 350 or more and 420 nm or less; and a phosphor layer including four or more types of phosphors and resin, wherein the white light source satisfies a relational equation of: ?0.2?[(P(?)×V(?))/(P(?max1)×V(?max1))?(B(?)×V(?))/(B(?max2)×V(?max2))]?+0.2, assuming that: a light emission spectrum of the white light source is P(?); a light emission spectrum of black-body radiation having a same color temperature as that of the white light source is B(?); a spectrum of a spectral luminous efficiency is V(?); a wavelength at which P(?)×V(?) becomes largest is ?max1; and a wavelength at which B(?)×V(?) becomes largest is ?max2, and wherein an amount (difference) of chromaticity change on CIE chromaticity diagram from a time of initial lighting up of the white light source to a time after the white light source is continuously lighted up for 6000 hours is less than 0.010.

Abstract: In one embodiment, an LED light bulb includes an LED module, a base part on which the LED module is disposed, and a globe attached to the base part. The LED module includes an ultraviolet to violet light-emitting LED chip mounted on a substrate. A lighting circuit and a bayonet cap are provided at the base part. A phosphor screen emitting white light by absorbing the ultraviolet to violet light emitted from the LED chip is provided on an inner surface of the globe. The phosphor screen has a color in which a* is ?10 or more and +10 or less, b* is 0 (zero) or more and +30 or less, and L* is +40 or more when a body color thereof is represented by an L*a*b* color system.

Abstract: According to the embodiment, a white lighting device includes a semiconductor light-emitting element emitting near-ultraviolet light, and a phosphor layer containing at least a blue-green phosphor emitting blue-green light and a red phosphor emitting red light and emits white light having a correlated color temperature of 5000 K or less and a deviation duv from a blackbody locus of not less than ?0.01 nor more than 0.01, in which a ratio of a content of the red phosphor to a content of the blue-green phosphor in the phosphor layer by mass is not less than 35 nor more than 50.

Abstract: A semiconductor light emitting element emits ultraviolet light or blue light that impinges upon a light emitting cover portion including a blue phosphor, a green phosphor, a red phosphor and a deep red phosphor to emit white light by mixing the light emission colors from the phosphors. The deep red phosphor has a main emission peak in a longer wavelength region than a main emission peak of the red phosphor. The red phosphor includes at least one component selected from: a europium-activated SiAlON phosphor and a europium-activated CASN phosphor each having a predetermined composition. The deep red phosphor includes a manganese-activated magnesium florogermanate phosphor having a predetermined composition. The white light emitting lamp is excellent in both high luminance and high color rendering properties.

Abstract: The present invention provides a white light source comprising a blue light emitting LED having a light emission peak of 421 to 490 nm and satisfying a relational equation of ?0.2?[(P(?)×V(?))/(P(?max1)×V(?max1))?(B(?)×V(?))/(B(?max2)×V(?max2))]?+0.2, assuming that: a light emission spectrum of the white light source is P(?); a light emission spectrum of black-body radiation having a same color temperature as that of the white light source is B(?); a spectrum of a spectral luminous efficiency is V(?); a wavelength at which P(?)×V(?) becomes largest is ?max1; and a wavelength at which B(?)×V(?) becomes largest is ?max2. According to the above white light source, there can be provided a white light source capable of reproducing the same light emission spectrum as that of natural light.

Abstract: A white light source 1 of an embodiment has color temperature of 2600 [K] or more and less than 3200 [K]. The white light source of the embodiment has a ratio of a minimum emission intensity to a maximum emission intensity in a wavelength region of from 450 to 610 [nm] on an emission spectrum of 0.16 or more and less than 0.35.

Abstract: The present invention provides a white light source satisfying a relational equation of ?0.2?[(P(?)×V(?))/(P(?max1)×V(?max1))?(B(?)×V(?))/(B(?max2)×V(?max2))]?+0.2, assuming that: a light emission spectrum of the white light source is P(?); a light emission spectrum of black-body radiation having a same color temperature as that of the white light source is B(?); a spectrum of a spectral luminous efficiency is V(?); a wavelength at which P(?)×V(?) becomes largest is ?max1; and a wavelength at which B(?)×V(?) becomes largest is ?max2. According to the above white light source, there can be provided a white light source capable of reproducing the same light emission spectrum as that of natural light.

Abstract: According to the embodiment, a white lighting device includes a semiconductor light-emitting element emitting near-ultraviolet light, and a phosphor layer containing at least a blue-green phosphor emitting blue-green light and a red phosphor emitting red light and emits white light having a correlated color temperature of 5000 K or less and a deviation duv from a blackbody locus of not less than ?0.01 nor more than 0.01, in which a ratio of a content of the red phosphor to a content of the blue-green phosphor in the phosphor layer by mass is not less than 35 nor more than 50.

Abstract: In one embodiment, an LED light bulb includes an LED module, a base portion on which the LED module is disposed, and a glove attached to the base portion. The LED module includes an ultraviolet to violet light-emitting LED chip mounted on a substrate. A lighting circuit and a bayonet cap are provided in and on the base portion. A fluorescent film is provided on an inner surface of the glove, and emits white light by absorbing ultraviolet to violet light emitted from the LED chip. The fluorescent film has a film thickness in a range of 80 to 800 ?m. In the LED light bulb, an amount of ultraviolet light which leaks from the glove is 0.1 mW/nm/lm or less.

Abstract: A white light emitting lamp 1 includes a phosphor layer 5 which emits white light by being excited by light emitted from a semiconductor light emitting element 2. A transparent resin layer 4 is interposed between the semiconductor light emitting element 2 and the phosphor layer 5. The phosphor layer 5 contains, as a green phosphor, a rare earth borate phosphor activated by trivalent cerium and terbium.

Abstract: An object is to provide a white light emitting lamp 1 comprising: a semiconductor light emitting element 2 which is placed on a board 3 and emits ultraviolet light or blue light; and a light emitting portion that is formed so as to cover a light emitting surface of the semiconductor light emitting element 2, the light emitting portion containing a blue phosphor B, a green phosphor G, a red phosphor R and a deep red phosphor DR that are excited by the light emitted from the semiconductor light emitting element 2 to respectively emit blue light, green light, red light and a deep red light, the white light emitting lamp 1 emitting white light by mixing light emission colors from the blue phosphor B, the green phosphor G, the red phosphor R and a deep red phosphor DR with one another, wherein the deep red phosphor DR has a main emission peak in a longer wavelength region than a main emission peak of the red phosphor, the red phosphor R comprises at least one component selected from: a europium-activated SiAlON ph

Abstract: An object is to provide a white light emitting lamp in which a BGR phosphor containing blue, green and red phosphor is combined with a semiconductor light emitting element such as an LED, a deep red phosphor having a main emission peak in a longer wavelength region than a main emission peak of the red phosphor is further added so as to enhance characteristics, whereby both high luminance and high color rendering properties can be obtained.

Abstract: A white light emitting lamp 1 includes a phosphor layer 5 which emits white light by being excited by light emitted from a semiconductor light emitting element 2. A transparent resin layer 4 is interposed between the semiconductor light emitting element 2 and the phosphor layer 5. The phosphor layer 5 contains, as a green phosphor, a rare earth borate phosphor activated by trivalent cerium and terbium.

Abstract: When a phosphor for ultraviolet excitation or visible light excitation is excited by light having wavelengths in a range of 100 to 500 nm and emission colors of the phosphor are represented by xy coordinates, the phosphor has a difference between a maximum value and a minimum value of x coordinates and a difference between a maximum value and a minimum value of y coordinates which are respectively 0.020 or less. A light-emitting device includes a light-emitting part which contains at least such a phosphor. The light-emitting part emits visible light when irradiated with ultraviolet or visible light emitted from an excitation source.

Abstract: The present invention provides a white LED comprising: an ultraviolet emitting diode or a purple light emitting diode; and phosphors for emitting at least three visible lights including blue light, green light and red light; wherein an emission spectrum of the white LED has: a first luminescence peak in a blue light region having a wavelength of 440-460 nm; a second luminescence peak in a green light region having a wavelength of 510-530 nm; and a third luminescence peak in a red light region having a wavelength of 620-640 nm. Further, it is preferable that a half bandwidth of each of the luminescence peaks is 50 nm or less. As a result, there can be provided a white LED, backlight and liquid crystal display using the white LED exhibiting a high luminance and an excellent color reproducing property.

Abstract: When a phosphor for ultraviolet excitation or visible light excitation is excited by light having wavelengths in a range of 100 to 500 nm and emission colors of the phosphor are represented by xy coordinates, the phosphor has a difference between a maximum value and a minimum value of x coordinates and a difference between a maximum value and a minimum value of y coordinates which are respectively 0.020 or less. A light-emitting device includes a light-emitting part which contains at least such a phosphor. The light-emitting part emits visible light when irradiated with ultraviolet or visible light emitted from an excitation source.

Abstract: The present invention provides a white LED comprising: an ultraviolet emitting diode or a purple light emitting diode; and phosphors for emitting at least three visible lights including blue light, green light and red light; wherein an emission spectrum of the white LED has; a first luminescence peak in a blue light region having a wavelength of 440-460 nm; a second luminescence peak in a green light region having a wavelength of 510-530 nm; and a third luminescence peak in a red light region having a wavelength of 620-640 nm. Further, it is preferable that a half bandwidth of each of the luminescence peaks is 50 nm or less.

Abstract: A socket tool for alternative use in combination with a screw driver or a conventional wrench. A socket body is formed so as to fit externally over a driver bit and is movable axially therealong and is detachable therefrom but is non-rotatable relative to the driver bit over its length. Socket portions are provided on opposite end portions of the socket body, with internal dimensions different from one another. Outer peripheries of the socket portions at both ends of the socket body are formed into regular polygonal shapes in cross section and serve as external drive engaging faces, to be engaged externally by the wrench. The outer peripheries of both the socket portions have external diameters different from one another. The socket tool is held alternatively on either the driver bit or the wrench, with one of the socket portions engaging the driver bit or wrench and the other socket portion projecting longitudinally away therefrom.