SILICATE-BASED GREEN PHOSPHORS

摘要

Novel green phosphors are dislcosed having the comprise silicate-based compounds having the formula (Sr,A₁)_x(Si,A₂)(O,A₃)_2+X:Eu²⁺ where A₁ is at least one divalent cation (a 2+ ion) including Mg, Ca, Ba or Zn, or a combination of 1+ and 3+ cations; A₂ is a 3+, 4+, or 5+ cation, including at least one of B, A1, Ga, C, Ge, N, and P; A₃ is a 1-, 2-, or 3- anion, including F, Cl, Br, and S; and x is any value between 1.5 and 2.5, both inclusive. The formula is written to indicate that the A₁ cation replaces Sr; the A₂ cation replaces Si, and the A₃ anion replaces O. These green phosphors are configured to emit visible light having a peak emission wavelength greater than about 480 nm. They have applications in green illumination systems, red-green-blue backlighting systems, white LEDs, and plasma display panels (PDPs).