Patent · US Expired

Phosphor composition comprising fine-grain and coarse-grain SiO.sub.2 particles

US6010779A · kind A · utility

3Cited by

3References

8Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Friederike Picht · Düren, DE
Jacqueline Merikhi · Aachen, DE
Joachim Opitz · Aachen, DE
Hans-Otto Jungk · Eschweiler, DE
Jan W. G. de Bakker · Geldrop, NL
Miguel Boutelje · Eindhoven, NL
Arlis Gregory Van Braam · Eindhoven, NL
Frans Vollebregt · Waalre, NL

Key dates

Filing date	Oct 5, 1997
Grant date	Jan 4, 2000
Priority date	—
Expiry date	Oct 5, 2017

Classification

Technology area (CPC Y)Emerging Cross-Sectional Technologies
CPC primaryY10T428/2993
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

A display screen having a phosphor coating comprising a phosphor composition of a phosphor provided with a coating which comprises one or more oxgyen compounds of the elements zinc, aluminium, magnesium, calcium and barium as well as colloidal SiO.sub. particles, said colloidal SiO.sub.2 particles being composed of SiO.sub.2 particles having an average size of 4 nm.ltoreq.d.ltoreq.30 nm, corresponding to a specific surface of 100 m.sup.2 /g.ltoreq.A.sub.s .ltoreq.550 nm m.sup.2 /g, and SiO.sub.2 particles having an average size of 50 nm.ltoreq.d.ltoreq.150 nm, corresponding to a specific surface of 25 m.sup.2 /g.ltoreq.A.sub.s .ltoreq.70 m.sup.2 /g.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.