Enhancement of inorganic electroluminescence by chlorinefunctionalized CNTs

摘要

We have investigated AC inorganic electroluminescence devices, where chlorine-functionalized carbon nanotubes (Cl-CNTs) were incorporated in the dielectric layer. At the concentration of 0.01 wt% of Cl-CNTs, roughly 50% incrementin the luminance was observed, while maintaining a 30% reduction in the current density. It was further supported by theseparate measurement of dielectric performance of the dielectric layers only, yielding to high dielectric constant andreasonably low dielectric loss for Cl-CNT incorporated layers. The enhancement in the dielectric constant is attributed tothe micro-capacitor effect by space charge polarization at the interface between the phosphor layer and the dielectriclayer. High polarization of C-Cl bonds within the dielectric layer is considered to promote the space charge polarization.To control the concentration of Cl-CNTs low is important in order not to cause percolation behavior of crisscrossingCNTs, which easily leaded to leakage current paths within the dielectric layer.