Fluorescent lamp
US4527087A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 30, 1982 |
| Grant date | Jul 2, 1985 |
| Priority date | — |
| Expiry date | Aug 30, 2002 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01J61/44
- WIPO fieldBasic materials chemistry
- WIPO sectorChemistry
Abstract
Disclosed is a fluorescent lamp which comprises a mixture of a phosphor (i) comprising an alkaline earth metal halophosphate phosphor activated with divalent europium, represented by the general formula: EQU M.sub.5-x X(PO.sub.4).sub.3 :Eu.sup.2+ (x) PA0 wherein M consists of Ba, Ca and Mg, containing 3 to 4.5 gram-atom of Ba, 0.5 to 2 gram-atom of Ca and 0.01 to 1 gram-atom of Mg each; X is one or more of F, Cl or Br; and 0.01<x.ltoreq.0.2 and having the emission peak at the wavelength region of 480 to 500 nm, and a phosphor (ii) having the emission peak at the wavelength region of 620 to 640 nm and having the half width of 120 to 160 nm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.