Light Technology Institute (LTI) and DFG Center for Functional Nanostructures, Karlsruhe Institute of Technology (KIT), Kaiserstrasse 12, 76131 Karlsruhe, Germany.
Nano Lett. 2013 Feb 13;13(2):475-80. doi: 10.1021/nl3038689. Epub 2013 Jan 24.
We present highly efficient electroluminescent devices using size-separated silicon nanocrystals (ncSi) as light emitting material. The emission color can be tuned from the deep red down to the yellow-orange spectral region by using very monodisperse size-separated nanoparticles. High external quantum efficiencies up to 1.1% as well as low turn-on voltages are obtained for red emitters. In addition, we demonstrate that size-separation of ncSi leads to drastically improved lifetimes of the devices and much less sensitivity of the emission wavelength to the applied drive voltage.
我们展示了使用尺寸分离硅纳米晶体（ncSi）作为发光材料的高效电致发光器件。通过使用非常单分散的尺寸分离纳米粒子，可以将发射颜色从深红色调谐到黄色橙色光谱区域。对于红色发射器，获得了高达 1.1％的高外量子效率和低开启电压。此外，我们证明了 ncSi 的尺寸分离导致器件的寿命大大提高，并且发射波长对所施加的驱动电压的灵敏度大大降低。
