Low rare earth mineral photoluminescent compositions and structures for generating long-persistent luminescence
US8952341B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Sep 6, 2012 |
| Grant date | Feb 10, 2015 |
| Priority date | — |
| Expiry date | Aug 22, 2033 |
Classification
- Technology area (CPC B)Performing Operations; Transporting
- CPC primaryB32B2307/422
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A low rare earth mineral photoluminescent structure for generating long-persistent luminescence that utilizes at least a phosphorescent layer comprising one or more phosphorescent materials having substantially low rare earth mineral content of less than about 2.0 weight percent, and one or more fluorescent layers is disclosed. Further disclosed are methods for fabricating and using the inventive low rare earth mineral photoluminescent structure. A low rare earth mineral photoluminescent composition for generating long-persistent luminescence that utilizes at least one or more phosphorescent materials having substantially low rare earth mineral content of less than about 2.0 weight percent and one or more fluorescent materials is also disclosed, as well as, the methods for fabricating and using the inventive low rare earth mineral photoluminescent composition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.