Waterproof multiple rare-earth co-activated long-afterglow luminescent material
US8329062B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Nov 15, 2007 |
| Grant date | Dec 11, 2012 |
| Priority date | — |
| Expiry date | Mar 17, 2029 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7797
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
The present invention relates to a waterproof multiple rare-earth co-activated long-afterglow luminescent material having its general chemical composition depicted by a formula aMO.bAl2O3.cSiO2.dGa2O3:xEu.yB.zN, wherein a, b, c, d, x, y, and z are coefficients with the ranges of 0.5≦a≦2, 0.5≦b≦3, 0.001≦c≦1, 0.0001≦d≦1, 0.0001≦x≦1, 0.0001≦y≦1, 0.0001≦z≦1, M is Ca or Sr, N is Dy or Nd, wherein Sr (or Ca), Al, Si, Ga are main substrate matrix elements and Eu, B, Dy (or Nd) elements are activators. The waterproof multiple rare-earth co-activated long-afterglow luminescent material according to the present invention not only has advantage of a longer afterglow time, but also has water resistance greatly superior to rare-earth activated aluminate long-afterglow luminescent material in the prior art, and still keeps higher long-afterglow property after dipping into water for 60 hours, especially shows its superiority when working or used under the environment of dipping into water or dampness.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.