Fluorescent substance, fluorescent composition, fluorescent mark carrier and optical reader thereof
US5932139A · kind A · utility
86Cited by
18References
11Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Nov 17, 1995 |
| Grant date | Aug 3, 1999 |
| Priority date | — |
| Expiry date | Nov 17, 2015 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC09K11/7777
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
A fluorescent substance of the following general formula: EQU Ln.sub.X A.sub.1-X PO.sub.4 wherein Ln represents at least one element selected from the group consisting of Nd, Yb and Er; A represents at least one element selected from the group consisting of Y, La, Gd, Bi, Ce, Lu, In and Tb; and X represents a value within the range of 0.01 to 0.99.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.