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:
Certain embodiments provide a white LED for a backlight of a liquid crystal display device, which comprises an ultraviolet (or violet) light emitting element and a phosphor layer that contains a green phosphor selected from trivalent cerium- and terbium-activated rare earth borate phosphors, a blue phosphor selected from divalent europium-activated halophosphate phosphors and divalent europium-activated aluminate phosphors, and a red phosphor selected from europium-activated lanthanum oxysulfide phosphors and europium-activated yttrium oxysulfide phosphors as the contained amounts of the respective phosphors relative to the total amount of the phosphors as follows: 35-50% by weight of the green phosphor content; 50-70% by weight of the blue phosphor content; and 1-10% by weight of the red phosphor content.
摘要:
Certain embodiments provide a white LED for a backlight of a liquid crystal display device, which comprises an ultraviolet (or violet) light emitting element and a phosphor layer that contains a green phosphor selected from trivalent cerium- and terbium-activated rare earth borate phosphors, a blue phosphor selected from divalent europium-activated halophosphate phosphors and divalent europium-activated aluminate phosphors, and a red phosphor selected from europium-activated lanthanum oxysulfide phosphors and europium-activated yttrium oxysulfide phosphors as the contained amounts of the respective phosphors relative to the total amount of the phosphors as follows: 35-50% by weight of the green phosphor content; 50-70% by weight of the blue phosphor content; and 1-10% by weight of the red phosphor content.
摘要:
A writing apparatus includes: a detecting unit; a reading unit; a writing unit; a display; a first controlling unit; a second controlling unit; and a third controlling unit.
摘要:
A light emitting device 1 has, as a light source, a light emitting semiconductor element such as a light emitting diode 2. Light radiated from the light emitting diode 2 is converted to visible light in a light emitting part 8 having a plurality of phosphors 9 different in emission color, and the visible light is emitted. In such a light emitting device 1, a maximum value (Δx, Δy) of color difference (absolute value) between emission chromaticity (x, y) and emission chromaticity (x1, y1) satisfies conditions of Δx
摘要翻译:发光器件1具有作为光源的诸如发光二极管2的发光半导体元件。从发光二极管2照射的光在具有多个荧光体9的发光部8中被转换为可见光 发射颜色不同,发出可见光。 在这样的发光装置1中,发光色度(x,y)与发光色度(x1,y1)之间的色差(绝对值)的最大值(&Dgr; x,&Dgr; y)满足条件&Dgr; x < 0.05和&Dgr; y <0.05,其中(x,y)是直接在光源上方测量的发射色度,(x1,y1)是从发光器件的所有方向测量的每个前灯和侧面漏光的发射色度 1。
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.
摘要:
A white LED lamp including: a conductive portion; a light emitting diode chip mounted on the conductive portion, for emitting a primary light having a peak wavelength of 360 nm to 420 nm; a transparent resin layer including a first hardened transparent resin, for sealing the light emitting diode chip; and a phosphor layer covering the transparent resin layer, the phosphor layer being formed by dispersing a phosphor powder into a second hardened transparent resin, and the phosphor powder receiving the primary light and radiating a secondary light having a wavelength longer than that of the primary light. An energy of the primary light contained in the radiated secondary light is 0.4 mW/lm or less. In the white LED lamp, a backlight, and an illumination device using the white LED lamp an amount of UV light to be contained in the released light and an amount of heat to be generated from the lamp are decreased to be small.
摘要:
A light-emitting device includes a semiconductor light-emitting element arranged on a substrate having internal wiring, a reflector arranged around the semiconductor light-emitting element, and a light-emitting portion, filled in the reflector, having a phosphor which emits visible light when excited by light from the semiconductor light-emitting element. Electrical conduction to the light-emitting element is obtained via the internal wiring of the substrate and the reflector.
摘要:
A multi-level optical writer for writing an image by illumination to an optical-write-type recording medium laid with a display layer having a memory nature and a photoconductive layer, the optical writer includes: a holding portion holding the optical-write-type recording medium; and a write section for writing a multi-level image to the display layer by illuminating, to the photoconductive layer, image light having optical dots different in size in accordance with a gray level.
摘要:
A light-emitting device includes a semiconductor light-emitting element arranged on a substrate having internal wiring, a reflector arranged around the semiconductor light-emitting element, and a light-emitting portion, filled in the reflector, having a phosphor which emits visible light when excited by light from the semiconductor light-emitting element. Electrical conduction to the light-emitting element is obtained via the internal wiring of the substrate and the reflector.