Abstract:
An electroluminescent phosphor comprising particles of a phosphor and particles of an electron-emitting material not originating from atoms constituting the host material of the phosphor and an activator. The particles of the electron-emitting material is contained inside the phosphor particles or included between the phosphor particles in close contact with the phosphor particles. An electroluminescent element has a light emitting layer containing the electroluminescent phosphor. Another electroluminescent element has a light emitting layer containing particles of a phosphor and particles of an electron-emitting material composed of a conductive compound not originating from the atoms constituting the host material of the phosphor and the activator. The proportion of the electron-emitting material to the light emitting layer is 1-75 weight%. A high-luminous efficiency and high-luminance electroluminescent element can be produced.
Abstract:
A thin film phosphor for an electroluminescent device, in which the phosphor is selected from the group consisting of thioaluminates, thiogallates and thioindates having at least one cation selected from elements of Groups IIA and IIB of the Periodic Table of Elements. The phosphor is activated by a rare earth metal and co-activated with gadolinium. The phosphor provides improved luminance. An electroluminescent device comprising the thin film phosphor on a substrate is also described. Further aspects provide an electroluminescent device in which the thin film phosphor is adjacent to a thin film of zinc sulphide, preferably sandwiched between thin films of zinc sulphide.
Abstract:
It is desired to provide a phosphor particle that has a smaller content of a phosphor, and therefore is inexpensive. A phosphor particle having a phosphor layer made of a phosphor on its surface and containing an inorganic non-phosphor material inside is provided. Further, the foregoing phosphor particle is further arranged so that the phosphor layer contains a compound made of M 1 , Al, and O (the M 1 is at least one metal element selected from Ba, Sr, Mg, and Ca) as a matrix and Eu and/or Mn as an activator. Furthermore, the foregoing phosphor particle is further arranged so that the phosphor layer contains a compound made of Zn, Si, and O as a matrix and Tb and/or Mn as an activator. Furthermore, the foregoing phosphor particle is further arranged so that the phosphor layer contains a compound made of M 4 and O (the M 4 is at least one metal element selected from Y, Gd, and B) as a matrix and Eu as an activator.
Abstract:
Phosphor powders and a method for making phosphor powders. The phosphor powders have a small particle size, a narrow particle size distribution and are substantially spherical. The method of the invention advantageously permits the economic production of such powders. The invention also relates to improved devices, such as display devices, incorporating the phosphor powders.
Abstract:
New oxide phosphors based on doped gallium oxides, alkaline earth gallates and germanates for electroluminescent display materials. Bright orange red electroluminescence has been obtained in amorphous and crystalline oxides Ga2O3:Eu for the first time. SrGa2O4 and SrGa4O9 doped with 1-8 mole % of Eu and Tb, CaGa2O4, Ca3Ga2O6 and CaGa4O7 doped with 1-4 mole % of Eu, Tb, Pr and Dy, BaGa2O4 doped with 1-2 mole % of Eu and Tb, have been prepared using RF magnetron sputtering onto ceramic dielectric substrates and annealed at 600 DEG C - 950 DEG C in air or Ar for 1-2 hours. Bright electroluminescent (EL) emission was obtained with wavelengths covering the visible sprectrum from 400 to 700 nm, and infrared emission above 700 nm with spectral peaks characteristic of rare earth transitions. The films of CaGa2O4 with 1 mole % Eu achieved 22 fL (75 cd/m ) at 60 Hz and had a maximum efficiency of 0.2 lm/w for red emission. An amorphous thin film of Ca3Ga2O6 with 2 mole % Eu achieved 34 fL in red EL at 60 Hz when annealed at 600 DEG C. SrGa2O4 with 1 mole % Eu and 4 mole % Tb yielded "white" phosphor having red, green and blue emission (13 fL at 60 Hz), and SrGa2O4 with 8 mole % Tb resulted in a blue and green phosphor measuring 30 fL at 60 Hz. Zn2Si0.5Ge0.5O4 containing Mn was sputtered using magnetron RF sputtering onto ceramic dielectric substrates and annealed at 700 DEG C for 1 hour in air or argon. Bright green (540 nm) emission was obtained in electroluminescence: 110 fL (377 cd/m ) at 60 Hz with a maximum efficiency of 0.9 l/w. Moderately bright red emission (640 nm) was also obtained.
Abstract:
A color cathode-ray tube having a high-luminance phosphor coating that emits deep red color. The color cathode-ray tube has a face plate coated with phosphor films of blue color-emitting, green color-emitting and red color-emitting components, and wherein an europium-activated rare earth oxide phosphor having an x-value of CIE color indication ranging from 0.630-0.652 and an europium-activated rare earth sulfide phosphor having an x-value ranging from 0.652-0.674 are mixed in order to form a phosphor film of a red color-emitting component having an x-value ranging from 0.647-0.662.
Abstract:
A method for preparing a sulfide phosphor where a raw material mixture for a sulfide phosphor is placed in an almost closed first heat-resistant container and fired therein, the method being characterized in that an auxiliary material composed of carbon and/or a carbon-forming compound capable of being pyrolyzed at a temperature not higher than the firing temperature to form carbon, and a metal sulfide capable of reacting with the carbon and/or said carbon-forming compound at a temperature not lower than 600°C but not higher than the firing temperature to form a carbon sulfide is placed in the portion as physically separated from the raw material mixture for the sulfide phosphor in the said first heat-resistant container and the firing is conducted under such condition so that said first heat-resistant container may have a carbon sulfide atmosphere by the thermal reaction of the thus fired auxiliary materials.
Abstract:
A fluorescent lamp (10) is provided including a five phosphor blend (16) comprising four rare earth phosphors, including BAMn, and a non-rare earth white halophosphate phosphor. This phosphor blend (16) provides a lamp (10) that exhibits high color rendering index (CRI), of at least about 85, i.e. at least 87, while simultaneously achieving good lumen output, or lumens per watt (LPW), of at least about 70, i.e. at least 75, at all CCTs, and particularly at lower CCT of between about 3000K and 4100K. The phosphor system provided includes a rare earth-doped red emitting phosphor, a rare earth-doped blue emitting phosphor, a rare earth-doped green-blue emitting phosphor, a rare earth-doped green emitting phosphor and a non-rare earth white halophosphate phosphor.
Abstract:
To achieve a light-emitting device emitting light with high brightness, closer to natural light, and less color shift due to a small change in intensity of emitted light, in a light-emitting device including a light source emitting light by driving current and at least one wavelength-converting material absorbing at least part of the light from the light source and emitting light having a different wavelength, the color coordinate x 1 (17.5) and the color coordinate y 1 (17.5) of the light emitted at a driving current density of 17.5 A/cm 2 and the color coordinate x 1 (70) and the color coordinate y 1 (70) of the light emitted at a driving current density of 70 A/cm 2 satisfy the following Expressions (D) and (E) : - 0.06 ≤ x 1 17.5 - x 1 70 ≤ 0.06 - 0.06 ≤ y 1 17.5 - y 1 70 ≤ 0.06
Abstract translation:为了实现在包括通过驱动电流发射光的光源和在驱动电流的发光装置的发光装置中发射具有高亮度,更接近自然光的光的发光装置和由于发射光的强度的小的变化而导致的较少的色移 至少一个波长转换材料吸收来自光源的光的至少一部分并且发射具有不同波长的光,在驱动电流下发射的光的颜色坐标x 1(17.5)和色坐标y 1(17.5) 在驱动电流密度为70A / cm 2时发射的光的17.5A / cm 2的密度和颜色坐标x 1(70)和颜色坐标y 1(70)满足以下表达式(D)和(E ): - 0.06‰x 1 17.5 - x 1 70‰0.06 - 0.06‰y 1 17.5 - y 1 70‰0.06