COMPOSITE LUMINESCENT MATERIAL FOR SOLID-STATE SOURCES OF WHITE LIGHT

摘要

A composite luminescent material for solid-state sources of white light which comprise a light-emitting diode that emits radiation in the 430-480 nm range, as well as a mixture of at least two luminophores, the first of which has a yellow-orange glow in the 560-630 nm range, and the second of which is taken from the group consisting of aluminates of alkaline earth metals activated by europium. In the invention, at least one photo-storing luminophore which is virtually not excited by the primary radiation of the light-emitting diode, has a long afterglow and is taken in a quantity of from 10 to 90% is used as the second luminophore. Furthermore, the mass ratio of the yellow-orange luminophore to the photo-storing luminophore is: yellow-orange luminophore 10-90%; photo-storing luminophore 10-90%. The photoluminophore content in the mixtures can vary between 10 and 90 mass%, with the most preferred range being between 40 and 70 mass%. The resultant material is characterized by high brightness and by lighting parameters which correspond to the absolute black body radiation curve with a color temperature of from 1900 to 6100 K, has a long afterglow and is low cost.