Einer handvoll genialer Typen ist es gelungen erstmals aus einem einzigen halbleiter weisses Laserlicht herzustellen.

http://www.spiegel.de/wissenschaft/technik/weisser-laser-rot-gruen-blau-weiss-a-1046051.html

a, Photograph of the mixed emission colour from a multi-segment heterostructure nanosheet. (Note that the blue emission visible is from the adhesive between the MgF2 substrate and the glass slide.) bâh, Photographs of the enlarged dashed-box region in a when the different combinations of segments are pumped as indicated by the labels inside each figure, creating the mixed far-field emission colours red, green, blue, yellow, cyan, magenta and white. The top dots in each photograph are the direct image of laser emission, while the tails under these dots are the reflection from the substrate.

a, Photograph of the mixed emission colour from a multi-segment heterostructure nanosheet. (Note that the blue emission visible is from the adhesive between the MgF2 substrate and the glass slide.) bâh, Photographs of the enlarged dashed-box region in a when the different combinations of segments are pumped as indicated by the labels inside each figure, creating the mixed far-field emission colours red, green, blue, yellow, cyan, magenta and white. The top dots in each photograph are the direct image of laser emission, while the tails under these dots are the reflection from the substrate.