Luminescent materials that emit light in the visible range or the near infrared range
US7641815B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Mar 21, 2007 |
| Grant date | Jan 5, 2010 |
| Priority date | — |
| Expiry date | Aug 28, 2027 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC23C14/5806
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Luminescent materials and the use of such materials in anti-counterfeiting, inventory, photovoltaic, and other applications are described herein. In one embodiment, a luminescent material has the formula: [AaBbXxX′x′X″x″][dopants], wherein A is selected from at least one of elements of Group IA; B is selected from at least one of elements of Group VA, elements of Group IB, elements of Group IIB, elements of Group IIIB, elements of Group IVB, and elements of Group VB; X, X′, and X″ are independently selected from at least one of elements of Group VIIB; the dopants include electron acceptors and electron donors; a is in the range of 1 to 9; b is in the range of 1 to 5; and x, x′, and x″ have a sum in the range of 1 to 9. The luminescent material exhibits photoluminescence having: (a) a quantum efficiency of at least 20 percent; (b) a spectral width no greater than 100 nm at Full Width at Half Maximum; and (c) a peak emission wavelength in the near infrared range.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.