Patent ID: 8168086
Filing Date: 2012-05-01
Classification: C09K,H01J,H01L

Abstract:
1. A light emitting device comprising a light producing element configured to generate ultraviolet light having a wavelength of from about 250 nm to about 400 nm; and a self-activating phosphor comprising an ordered nitrogen-containing or nitrogen-free oxyfluoride compound having a formula: where A is Sr alone or Sr mixed with Ba and/or Ca such that A comprises at least about ⅔ mole % of Sr and up to about ⅓ mole percent of Ba and/or Ca; R is a rare earth element or a mixture of rare earth elements; M is Al, Ga, In, W, Mo, Bi, or mixtures thereof; 0<a<0.3; δ1 and δ2 are both from about 0.01 to about 0.1; and 0≦w≦0.05 such that 0≦w′≦0.1 and 0≦w″≦0.15; wherein the ultraviolet light excites the self-activating phosphor such that the self-activating phosphor emits visible light having a wavelength of from about 380 to about 750 nm.