摘要:
A white light emitting device includes a blue light emitting diode chip that emits blue light in a specific wavelength band, a first resin layer that seals the blue light emitting diode chip and includes a cured product of silicone resin, and a second resin layer that covers the first resin layer and includes phosphor powder, which absorbs the blue light and emits light in a specific wavelength band, and a cured product of transparent resin. The phosphor powder has a composition represented by the following Formula (1): (Sr1-x-yBaxEuy)2SiO4 (1) (in Formula (1), x and y satisfy a condition that 0.05
摘要:
The present invention provides a semiconductor light emitting device comprising a light intensity difference reducing layer provided between an ultraviolet semiconductor light emitting element and a wavelength converting material layer, and a backlight and a display device comprising the semiconductor light emitting device. The semiconductor light emitting device is an LED light emitting device which has improved uniformity of emitted light and reduced non-uniformity of brightness and chromaticity of emitted light. The light emitting device according to the present invention is particularly suitable for use in various display devices, preferably, for example, in display devices in equipment where a reduction in size, a reduction in weight, a reduction in thickness, electric power saving, high brightness, and excellent color rendering properties are particularly required, for example, cellular phones, personal digital assistants, electronic dictionaries, digital cameras, computers, liquid crystal televisions (TVs), and peripheral devices of these devices.
摘要:
A white light-emitting lamp (1) includes a light-emitting portion (9) which is excited by light emitted from a semiconductor light-emitting element (2) to emit white light. The light-emitting portion (9) contains a blue phosphor, a yellow phosphor and a red phosphor. The yellow phosphor is composed of a europium and manganese-activated alkaline earth silicate phosphor having a composition expressed by (Sr1-x-y-z-u, Bax, Mgy, Euz, Mnu)2SiO4 (0.1≦x≦0.35, 0.025≦y≦0.105, 0.025≦z≦0.25, 0.0005≦u≦0.02).
摘要:
Disclosed are a white LED, which has color reproducibility comparable with that of a cold-cathode tube and improved brightness, and a backlight and a liquid crystal display device comprising the white LED. The white LED comprises at least one light emitting element selected from ultraviolet light emitting diodes, purple light emitting diodes, ultraviolet light emitting lasers, and purple light emitting lasers, and a phosphor layer. The phosphor layer comprises a green phosphor satisfying formula 1, a blue phosphor satisfying formula 2 or 3, and a red phosphor satisfying formula 4 or 5: a trivalent cerium- and terbium-activated rare earth boride phosphor represented by formula 1: M1-x-yCexTbyBO3 wherein M represents at least one element selected from Sc (scandium), Y (yttrium), La (lanthanum), Gd (gadolinium), and Lu (lutetium); and x and y are respective numbers of 0.03
摘要:
A backlight unit 1 includes a plurality of light emitting devices 2 constituted with, for example, LED lamps, and an optical sheet 4 disposed on light emission surface 2b sides of the light emitting devices 2. The light emission surface sides of the plural light emitting devices are joined to the optical sheet 4 via joining layers 5. The backlight unit 1 satisfies a condition of n1≦n2≦n3, where n1 is a refractive index of the optical sheet 4, n2 is a refractive index of the joining layer 5, and n3 is a refractive index of the light emitting device 2.
摘要:
An LED light emitting device is provided that has high color rendering properties and is excellent color uniformity and, at the same time, can realize even luminescence unattainable by conventional techniques. A phosphor having a composition represented by formula: (Sr2-X-Y-Z-ωBaXMgYMnZEuω)SiO4 wherein x, y, z, and ω are respectively coefficients satisfying 0.1 z, and 0.01
摘要:
An LED light emitting device is provided that has high color rendering properties and is excellent color uniformity and, at the same time, can realize even luminescence unattainable by conventional techniques. A phosphor having a composition represented by formula: (Sr2-X-Y-Z-ωBaXMgYMnZEuω)SiO4 wherein x, y, z, and ω are respectively coefficients satisfying 0.1 z, and 0.01
摘要:
A light emitting module 1 includes a substrate 2 having a metal pattern 4 and a plurality of white light emitting devices 3 linearly arranged on the substrate 2. The metal pattern 4 is formed on a portion of 60% or more of an area of the substrate 2. The white light emitting device 3 includes a light emitting diode as a semiconductor light emitting element 5. Light emitted from the semiconductor light emitting element 5 is converted into white light by a light emitting section containing phosphors, and is taken out. The light emitting module 1 emits white light.
摘要:
This invention provides a white LED lamp using an ultraviolet light emitting LED, which can simultaneously realize a high level of color rendering and a high level of brightness by virtue of an improved combination of a blue light emitting phosphor, a green light emitting phosphor, and a red light emitting phosphor.A white LED lamp 1 according to the present invention comprises an LED chip 2 having a luminescence wavelength of not less than 360 nm and not more than 440 nm, and a light emitting part excitable upon exposure to light from the LED chip 2 to emit white light and comprising a phosphor, the phosphor comprising a blue light emitting phosphor, a green light emitting phosphor, and a red light emitting phosphor bonded to each other. At least one phosphor selected from europium-activated halophosphate phosphors and europium-activated aluminate phosphors is used as the blue light emitting phosphor. A gold- and aluminum-activated zinc sulfide phosphor is used as the green light emitting phosphor. At least one phosphor selected from europium- and samarium-activated lanthanum oxysulfide phosphors and copper- and manganese-activated zinc sulfide phosphors is used as the red light emitting phosphor.
摘要:
A white light-emitting device 1 includes a semiconductor light-emitting element 2 emitting ultraviolet light or violet light, and a light-emitting unit 10 which includes three or more kinds of visible light-emitting phosphors 9 and emits white light when excited by the light from the semiconductor light-emitting element 2. The emission spectrum of the light-emitting unit 10 has peaks in a blue region of not less than 440 nm nor more than 460 nm, a green region of not less than 510 nm nor more than 530 nm, and a red region of not less than 620 nm nor more than 640 nm, and the three or more kinds of visible light-emitting phosphors 9 are bound together with a binder in advance.