Patent · US Expired

Green-luminescing zinc sulphide and cathode ray tube provided with this zinc sulphide

US5558817A · kind A · utility

4Cited by

3References

2Claims

0Family size

Assignee

U.S. Philips Corporation · US

Inventors

Michael Bredol · Aachen, DE
Ulrich Kynast · Roetgen, DE

Key dates

Filing date	Sep 22, 1994
Grant date	Sep 24, 1996
Priority date	—
Expiry date	Sep 22, 2014

Classification

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

Abstract

The invention relates to a luminescent zinc sulphide of cubic structure (sphalerite) which is so activated by aluminum and copper that a green-emitting luminescent material is created. In a simple manufacturing process, high x-values of the colour point and high luminous efficacy values are achieved in that copper is added in a quantity of 200 to 450 mole ppm and aluminum in a quantity of 700 to 2000 mole ppm.

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