Patent · US Expired

Terbium-activated rare earth oxysulfide phosphors with controlled decay

US4113648A · kind A · utility

6Cited by
5References
3Claims
0Family size

Assignee

Inventors

Key dates

Filing dateNov 20, 1974
Grant dateSep 12, 1978
Priority date
Expiry dateNov 20, 1994

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC09K11/7767
  • WIPO fieldBasic materials chemistry
  • WIPO sectorChemistry

Abstract

Europium and ytterbium when added to terbium-activated rare earth phosphors having either a lanthanum oxysulfide, gadolinium oxysulfide, or yttrium oxysulfide host increase the decay period of the phosphors in a controlled manner.

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