Patent ID: 6657379
Filing Date: 2003-12-02
Classification: C04B,C09K,H01L

Abstract:
An illumination unit having at least one LED as light source, the LED emitting primary radiation in the range from 300 to 485 nm, this radiation being partially or completely converted into longer-wave radiation by phosphors which are exposed to the primary radiation of the LED,wherein conversion takes place at least with the aid of a phosphor which emits yellow-orange with a peak emission wavelength at 540 to 620 nm and originates from the class of the Eu-activated sialons, the sialon corresponding to the formula Mp/2Si12âˆ’pâˆ’qAlp+qOqN16âˆ’q:Eu2+, where M=Ca individually or in combination with at least one of the metals Sr or Mg, where q=0 to 2.5 and p=0.5 to 3.