60results about How to "Broad emission spectrum" patented technology

To provide a phosphor having a broad emission spectrum with a peak in the range from yellow color to red color (wavelength from 570 nm to 620 nm), having a flat excitation band with large area on the long wavelength side from near ultraviolet / ultraviolet to green color (wavelength from 250 nm to 550 nm), and excellent in emission intensity and luminance, and a method of manufacturing the same, and also a light source such as white LED using the phosphor. As raw materials, Ca3N2(2N), AlN(3N), Si3N4(3N), and Eu2O3(3N) are prepared, and out of each raw material, 0.950 / 3 mol of Ca3N2, 2 mol of AlN, 4 / 3 mol of Si3N4, and 0.050 / 2 mol of Eu2O3 are weighed, and the raw materials thus weighed are mixed by using a mortar. The raw materials thus mixed are put in a BN crucible, and retained / fired for 3 hours at 1700° C. in a nitrogen atmosphere, and thereafter cooled from 1700° C. to 200° C., to thereby obtain the phosphor expressed by a composition formulaCa0.950Al2Si4O0.075N7.917:Eu0.050.

An object is to provide a novel organic compound capable of visible light emission. In particular, an object is to provide a novel organic compound that exhibits a broad emission spectrum when it is used for a light-emitting element. In addition, an object is to provide a light-emitting element and a light-emitting device that gives white light emission with an excellent color rendering property. The quinoxaline derivative represented by General Formula (1) is provided. Since the quinoxaline derivative represented by General Formula (1) is capable of emitting visible light, it can be favorably used for a light-emitting element. In particular, since the quinoxaline derivative represented by General Formula (1) exhibits a broad emission spectrum when it is used for a light-emitting element, by using it for a light-emitting element a light-emitting element that gives white light emission with an excellent color rendering property can be obtained.

To provide a phosphor given by a general composition formula expressed by MmAaBbOoNn:Z, (wherein element M is one or more kinds of elements having bivalent valency, element A is one or more kinds of elements having tervalent valency, element B is one or more kinds of elements having tetravalent valency, O is oxygen, N is nitrogen, and element Z is one or more kind of activating agent, satisfying m>0, a>0, b>0, o≧0, and n>0), with a change rate of a ratio of element B atoms to the total numbers of atoms being smaller by 10% or the change rate of oxygen atoms to the total numbers of atoms being smaller by 40% in a range from a particle surface up to depth 2000 nm, having a broad emission spectrum in a range of blue color, having a broad flat excitation band in a range of near ultraviolet / ultraviolet, and having excellent emission efficiency, emission intensity, and luminance.

The invention discloses a composite structure based on Ce: YAG (yttrium aluminum garnet) wafer. The composite structure comprises a Ce: YAG wafer and a red-light emitting layer fixed on the Ce: YAG wafer. The invention also discloses a production method for the composite structure based on the Ce: YAG wafer simultaneously, for forming an optical composite structure capable of realizing light emitting in a broadband from green light to red light. The composite structure and the production method are widely applied in the fields of detection equipment and illumination devices.

The invention relates to a value document having a security marking in the form of two luminescent substances, the emission spectra of which partially overlap in a primary emission range, wherein theemission spectra have a degree of overlap of less than 80% and more than 5%, wherein the luminescent substances have different individual decay times in the primary emission range, wherein the individual decay times of the luminescent substances differ from one another by more than 50%, relative to the shortest individual decay time.

The invention provides a lutetium aluminate green fluorescent powder having a chemical general formula represented by Ce[x]Lu[3-x-y]M[y]Al[5]O[12], wherein M is at least one of La, Gd, Pr, Nd, Sm, Eu, Ga, Tb, Dy, Ho, Er, Tm, Yb and Sc, 0<x<0.1, and 0<y<0.1. The fluorescent powder is prepared by a high temperature solid phase method, and the synthesis temperature is 1300-1500 DEG C; the prepared fluorescent powder has the advantages of good optical properties, no impurity phases, good crystallization and basically no agglomeration, has nearly spherical particles and has the median particle size D50 adjustable in the range of 8-12 [mu]m; at the same time, the fluorescent powder has the advantages of relatively wide excitation spectra, high relative brightness, simple preparation process, low energy consumption, and environmental protection. The green fluorescent powder provided by the invention is suitable for preparation of white LED devices with combination of other primary-color fluorescent powders, and can be applied in the fields of illumination or display systems and the like.