Patent · US Expired

Electroluminescent alkaline-earth sulfide phosphor thin films with multiple coactivator dopants

US6072198A · kind A · utility

11Cited by
8References
8Claims
0Family size

Inventors

Key dates

Filing dateSep 14, 1998
Grant dateJun 6, 2000
Priority date—
Expiry dateSep 14, 2018

Classification

  • Technology area (CPC C)Chemistry; Metallurgy
  • CPC primaryC09K11/7703
  • WIPO fieldBasic materials chemistry
  • WIPO sectorChemistry

Abstract

A light emitting phosphor having improved luminance is incorporated into an ACTFEL device having front and rear electrode sets, a pair of insulators sandwiched between the front and rear electrode sets, and a thin film electroluminescent laminar stack which includes a phosphor layer having the formula M.sup.II S:D,H where M.sup.II is taken from the group calcium, strontium, barium, and magnesium, S=sulfur, D is taken from the group copper, lead, gold, silver, magnesium, antimony, bismuth and arsenic, and H is taken from the group fluorine, chlorine, bromine, and iodine. Deep blue and green chromaticity phosphors may be obtained through selection of multiple co-dopants and adjusting their relative concentrations.

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