LIGHT SOURCE COMPRISING A LUMINESCENT SUBSTANCE AND ASSOCIATED ILLUMINATION UNIT

摘要

A light source includes a primary radiation source, which emits radiation in the shortwave range of the optical spectral range, wherein this radiation is converted at least by means of a first luminescent substance entirely or partially into secondary longer-wave radiation in the visible spectral range, wherein the first luminescent substance originates from the class of nitridic modified orthosilicates (NOS), wherein the luminescent substance has as a component M predominantly the group EA=Sr, Ba, Ca, or Mg alone or in combination, wherein the activating dopant D is composed at least of Eu and replaces a proportion of M, and wherein a proportion of SiO2 is introduced in deficiency, so that a modified sub-stoichiometric orthosilicate is provided, wherein the orthosilicate is an orthosilicate stabilized with RE and N, where RE=rare earth metal.

主权项

1. A light source comprising a primary radiation source, which emits radiation in the shortwave range of the optical spectral range in the wavelength range of 420 to 480 nm, wherein this radiation is converted at least by means of a first luminescent substance entirely or partially into secondary longer-wave radiation in the visible spectral range, wherein the first luminescent substance originates from the class of nitridic modified orthosilicates (NOS), which is derived from the structure M2SiO4:D, wherein the luminescent substance has as a component M predominantly the group EA=Sr, Ba, Ca, or Mg alone or in combination, wherein the activating dopant D is composed at least of Eu and replaces a proportion of M, and wherein a proportion of SiO2 is introduced in deficiency, so that a modified sub-stoichiometric orthosilicate is provided, wherein the orthosilicate is an orthosilicate stabilized with RE and N, where RE=rare earth metal, so that the batch stoichiometry corresponds to the formula EA2-x-aRExEuaSi1-yO4-x-2yNx, wherein RE=La or Lu or Dy or Yb alone or in combination, and wherein the full width at half maximum FWHM of the NOS is at most 90 nm.