4 results about "Activator (phosphor)" patented technology

A ceramic scintillator of an embodiment includes a sintered body of a gadolinium oxysulfide phosphor containing praseodymium as a main activator. When a body color of the sintered body is represented by chromaticity coordinates (x, y) based on a CIE1931 chromaticity value, the sintered body has a body color satisfying 0.4≤x≤0.505 . . . (1) and 0.83x+0.075≤y≤0.83x+0.095 . . . (2). The ceramic scintillator of the embodiment is obtained by a method for manufacturing a ceramic scintillator, the method including a heat treatment step of causing a reaction gas containing oxygen and sulfur to react with the sintered body. A heat treatment time in the heat treatment step is 1 hour or more and 50 hours or less.

The present application discloses a red phosphor, and a preparation method and an application thereof and relates to the field of luminescent material technology. The chemical composition of the red phosphor is A2M(1-x)F6:xMn4+. The A is selected from at least one of alkali metal elements, and the M is selected from at least one of IVA group elements or a Ti element and a value range of the x is 0<x≤0.05. The red phosphor is granular; and a concentration of tetravalent manganese ions in a radial direction from a center of a particle of the red phosphor to a surface of the particle of the red phosphor decreases gradually. In the present application, the concentration of the activator Mn4+ in a radial direction from the center of the particle of the red phosphor to its surface is set to a descending gradient distribution to buffer the phosphor powder from the erosion of water vapor, thereby improving its anti-aging performance and prolonging the service life.

A phosphor (1) is given with the general formula EA6+w-xSE16-w+xD42-x-yEx+yN76-w-yOw+y: R, where EA is an element or combination of elements selected from the group of divalent elements, SE is an element or combination of elements selected from the group of rare earth elements, D is an element or combination of elements selected from the group of tetravalent elements, E is an element or combination of elements selected from the group of trivalent elements, R comprises an activator element, -6 ≤ wx ≤ 16, 0 ≤ x+y ≤ 42, 0 ≤ w+y ≤ 76, and 2*(6+wx)+3*(16-w+x)+4*(42-xy)+3*(x+y)-3*(76-wy)-2*(w+y) = 0. A method for producing a phosphor (1) and a radiation-emitting component (10) is further described.

A radiographic image detector includes a scintillator panel including a substrate, and on a substrate surface of the substrate, a vapor deposition film layer in which a phosphor component is vapor-deposited in a film form together with an activator component. A vapor deposition film thickness corresponding to a thickness of the vapor deposition film layer from the substrate surface is set to a thickness within ±10% with respect to a film thickness median value over an entire surface of the vapor deposition film layer. A film thickness distribution related to the vapor deposition film thickness and an activator concentration distribution related to an activator concentration of the activator component in the vapor deposition film layer correlate with each other.