| 简介 |
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 oxyfluoride compound is provided. The nitrogen-free or nitrogen-containing ordered oxyfluoride compound has a formula : [in-line-formulae]A3-3a/2RaMO4-δ1-w′F1-δ2-w—Nw [/in-line-formulae] 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
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