Carbonitride based phosphors and light emitting devices using the same

US8512599B2 · kind B2 · utility

Assignee

• Lightscape Materials, Inc. · US

Inventors

• Yuanqiang Li · Plainsboro, US
• Yongchi Tian · Princeton Junction, US
• Michael Dennis Romanelli · East Brunswick Township, US

Key dates

• Filing date: Jul 19, 2010
• Grant date: Aug 20, 2013
• Expiry date: Jul 19, 2030

Classification

• Technology area (CPC H): Electricity
• CPC primary: H01L2224/8592
• WIPO field: Materials, metallurgy
• WIPO sector: Chemistry

Abstract

Disclosed herein is a novel group of carbidonitride phosphors and light emitting devices which utilize these phosphors. In certain embodiments, the present invention is directed to a novel family of carbidonitride-based phosphors expressed as follows:Ca1−xAlx−xySi1−x+xyN2−x−xyCxy:A;  (1)Ca1−x−zNazM(III)x−xy−zSi1−x+xy+zN2−x−xyCxy:A;  (2)M(II)1−x−zM(I)zM(III)x−xy−zSi1−x+xy+zN2−x−xyCxy:A;  (3)M(II)1−x−zM(I)zM(III)x−xy−zSi1−x+xy+zN2−x−xy−2w/3CxyOw−v/2Hv:A; and  (4)M(II)1−x−zM(I)zM(III)x−xy−zSi1−x+xy+zN2−x−xy−2w/3−v/3CxyOwHv:A,  (4a)wherein 0<x<1, 0<y<1, 0≦z<1, 0≦v<1, 0<w<1, x+z<1, x>xy+z, and 0<x−xy−z<1, M(II) is at least one divalent cation, M(I) is at least one monovalent cation, M(III) is at least one trivalent cation, H is at least one monovalent anion, and A is a luminescence activator doped in the crystal structure.