Color stable phosphors for LED lamps and methods for preparing them

Patent · Tue Nov 26 00:00:00 EST 2013

OSTI ID:1109086

Murphy, James Edward; Setlur, Anant Achyut; Camardello, Samuel Joseph

An LED lamp includes a light source configured to emit radiation with a peak intensity at a wavelength between about 250 nm and about 550 nm; and a phosphor composition configured to be radiationally coupled to the light source. The phosphor composition includes particles of a phosphor of formula I, said particles having a coating composition disposed on surfaces thereof; ((Sr.sub.1-zM.sub.z).sub.1-(x+w)A.sub.wCe.sub.x).sub.3(Al.sub.1-ySi.sub.y-)O.sub.4+y+3(x-w)F.sub.1-y-3(x-w) I wherein the coating composition comprises a material selected from aluminum oxide, magnesium oxide, calcium oxide, barium oxide, strontium oxide, zinc oxide, aluminum hydroxide, magnesium hydroxide, calcium hydroxide, barium hydroxide, strontium hydroxide, zinc hydroxide, aluminum phosphate, magnesium phosphate, calcium phosphate, barium phosphate, strontium phosphate, and combinations thereof; and A is Li, NA, K, or Rb, or a combination thereof; M is Ca, Ba, Mg, Zn, or a combination thereof; and 0<x.ltoreq.1.10, 0.ltoreq.y.ltoreq.0.5, 0.ltoreq.z.ltoreq.0.5, 0.ltoreq.x.ltoreq.x.

• Research Organization: General Electric Company, Niskayuna, NY, USA
• Sponsoring Organization: USDOE
• DOE Contract Number: FC26-06NT42934
• Assignee: General Electric Company (Niskayuna, NY)
• Patent Number(s): 8,593,062
• Application Number: 13/080,099
• OSTI ID: 1109086
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY