Patent ID: 6674233
Filing Date: 2004-01-06
Classification: C09K,F21K,H01L,Y02B

Abstract:
An illumination unit having at least one LED as light source, the LED emitting primary radiation in the range from 300 to 430 nm, in particular 380 to 420 nm, this radiation being completely converted into longer-wave radiation by phosphors which are exposed to the primary radiation of the LED, wherein the conversion takes place at least with the aid of a phosphor which emits green with a peak emission wavelength at 495 to 540 nm and which originates from the class of the Ce-activation sialons, the sialon corresponding to the formula Mp/2Si12âˆ’pâˆ’qAlp+qOqN16âˆ’q:Ce3+, where M=Ca individually or in combination with Sr, with q=0 to 2.5 and p=1.5 to 3.