Hybrid light-emitting devices based on organic semiconductors and inorganic semiconductor nanocrystals are of great interest for applications in optical displays and solid-state light sources. Silicon, a poor light emitter in bulk form, can exhibit strong luminescence in nanocrystal form; however, efficient electrical excitation had not been demonstrated. In this study, Cheng et al. showed a silicon nanocrystal device with an external quantum efficiency of 8.6%, the highest reported efficiency for any nanocrystal light emitting device.
