Patent ID: 8471456
Filing Date: 2013-06-25
Classification: H01L

Abstract:
1. An electroluminescent light source comprising a layer structure applied to a substrate, said layer structure comprising: a first sublayer structure comprising at least one electrode as anode, one electrode as cathode and an electroluminescent layer located therebetween for emitting light, wherein one of the electrodes is provided for reflecting the light and the other electrode is provided for transmitting the light, a second sublayer structure which adjoins the electrode provided for transmitting the light, said second sublayer structure comprising at least one semitransparent layer for partially reflecting the light, and a third sublayer structure which, as seen in the emission direction of the light, is arranged behind the second sublayer structure, said third sublayer structure comprising particles for absorbing some of the light at wavelengths below a threshold wavelength, for emitting light at wavelengths above the threshold wavelength, and for scattering the non-absorbed light, wherein a volume percent of the particles scattering the non-absorbed light of the third sublayer structure is greater than 50% and less than 60%, wherein the particles have a diameter greater than 0.5 μm, and the third sublayer structure is configured such that a path length of the light scattered in the third sublayer structure on average corresponds to twice a thickness of the third sublayer structure, wherein the path length is measured from a point when the light enters the third sublayer structure to a point when the light exits the third sublayer structure.