Patent · US Expired

Thioaluminate phosphor material with a gadolinium co-activator

US6617782B2 · kind B2 · utility

11Cited by
8References
35Claims
0Family size

Assignee

Inventors

Key dates

Filing dateMay 30, 2001
Grant dateSep 9, 2003
Priority date—
Expiry dateSep 29, 2021

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC09K11/7792
  • WIPO fieldBasic materials chemistry
  • WIPO sectorChemistry

Abstract

A thin film phosphor for an electroluminescent device, in which the phosphor is selected from the group consisting of thioaluminates, thiogallates and thioindates having at least one cation selected from elements of Groups IIA and IIB of the Periodic Table of Elements. The phosphor is activated by a rare earth metal and co-activated with gadolinium. The phosphor provides improved luminance. An electroluminescent device comprising the thin film phosphor on a substrate is also described. Further aspects provide an electroluminescent device in which the thin film phosphor is adjacent to a thin film of zinc sulphide, preferably sandwiched between thin films of zinc sulphide.

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