Claims
- 1. Luminescent article comprising a self-supporting or supported layer of phosphor particles dispersed in a binding medium and, adjacent thereto, a protective coating characterized in that, besides a binder, the said protective coating comprises titanium dioxide as a white pigment and in that said protective coating has a surface roughness (Rz) between 2 and 10 μm.
- 2. Luminescent article according to claim 1, wherein said surface roughness (Rz) is between 3 and 8 μm.
- 3. Luminescent article according to claim 1, wherein said binder comprises a urethane acrylate.
- 4. Luminescent article according to claim 1, wherein said white pigment is present in an amount by weight of up to 5% versus said binder.
- 5. Luminescent article according to claim 1, wherein said white pigment is present in an amount by weight of up to 2% versus said binder.
- 6. Luminescent article according to claim 1, wherein said white pigment is present in an amount by weight of up to 1% versus said binder.
- 7. Luminescent article according to claim 1, wherein said phosphor particles are dispersed in a binding medium, being a polymeric binder, wherein said phosphor particles are present in a volume ratio of at least 80/20.
- 8. Luminescent article according to claim 7, wherein said polymeric binder (i) comprises at least one polymer having a Tg≦0° C., (ii) has an average molecular weight (MGavg) between 5000 and 107, (iii) is soluble in ethylacetate for at least 5% by weight.
- 9. Luminescent article according to claim 7, wherein said polymeric binder is at least one member selected from the group consisting of vinyl resin, polyesters and polyurethane resins.
- 10. Luminescent article to claim 7, wherein said phosphor particles have a composition selected from the group consisting of Gd2O2S:Tb; GdOBr:Tm; YTaO4:Nb; BaFBr:Eu, BaFCl:Eu and CaWO4.
- 11. Luminescent article to claim claim 1, wherein said protective coating is provided by means of screen printing.
- 12. Luminescent article to claim claim 2, wherein said protective coating is provided by means of screen printing.
Priority Claims (1)
Number |
Date |
Country |
Kind |
98202151.1 |
Jun 1998 |
EP |
|
Parent Case Info
[0001] This application claims priority of U.S. Provisional Application Ser. No. 60/095,475 filed Aug. 5, 1998 and is a continuation-in-part of U.S. Ser. No. 09/313,188 filed May 18, 1999.
Provisional Applications (1)
|
Number |
Date |
Country |
|
60095475 |
Aug 1998 |
US |
Continuation in Parts (1)
|
Number |
Date |
Country |
Parent |
09313188 |
May 1999 |
US |
Child |
09950778 |
Sep 2001 |
US |