Patent · US Expired

Phosphor composition with a coating of colloidal SiO.sub.2 particles and an oxygen compound of magnesium, calcium, barium, zinc, or aluminum

US6013979A · kind A · utility

6Cited by

1References

8Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Friederike Picht · Düren, DE
Michael Bredol · Aachen, DE
Joachim Opitz · Aachen, DE
Frans Vollebregt · Waalre, NL

Key dates

Filing date	Jun 19, 1997
Grant date	Jan 11, 2000
Priority date	—
Expiry date	Jun 19, 2017

Classification

Technology area (CPC C)Chemistry; Metallurgy
CPC primaryC09K11/642
WIPO fieldBasic materials chemistry
WIPO sectorChemistry

Abstract

The invention relates to a display screen having a phosphor layer of a phosphor composition of a phosphor coated with an oxygen compound of one of the elements magnesium, calcium, barium, zinc and aluminium, and with colloidal SiO.sub.2 having an average particle size of 70 nm.ltoreq.d.ltoreq.130 nm. The invention further relates to a phosphor composition of a phosphor coated with an oxygen compound of one of the elements magnesium, calcium, barium, zinc and aluminium, and with colloidal SiO.sub.2 having an average particle size of 70.ltoreq.d.ltoreq.130 nm, and to a method of manufacturing the phosphor composition.

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