Abstract: It is the knowledge of the present invention that the spectrum of any light emitting device can be converted into a desired spectrum in a simple way, by providing a light emitting device with a light conversion layer, which has a dye with a conversion property, to convert the light emitted by the light emitting device into light of a different spectrum, and thereupon acting upon the spectrum conversion layer such that the dye is at least partly removed or a conversion property is destroyed. In this way, it is also possible in a simple way to structure a display of a plurality of light emitting devices to a color display, by providing a spectrum conversion layer for all light emitting devices, i.e.