P-Si-ZnO Nanocrystal Heterojunction Light Emitting Device

摘要

ZnO has a high potential for use in light-emitting devices in the visible and UV spectral range. One of the main challenges in an electrically driven device is the low energy of the valence band and, consequently, the difficult injection of holes. Here, we present an approach combining naturally n-type ZnO nanocrystals with intentionally p-doped Si nanoparticles in a solution-processable nanoparticle heterojunction multilayer. The heterojunction device exhibits an efficiency, that is more than one order of magnitude enhanced compared with the ZnO reference device. White electroluminescence with color rendering indices up to 98 is obtained.