Abstract
AbstractZnO is an excellent material candidate for ultraviolet (UV)‐light emitting devices based on its exciton emission. We have applied solution‐processed ZnO NCs to printed electroluminescence (EL) devices as their emission layers (EMLs) to develop a novel flexible lightweight, and flat‐panel UV‐light source. In this article, first, the structural properties of ZnO NCs fabricated from a solution route are presented together with the results of photoluminescence (PL). We address to suppression of the defect‐related green‐band PL from ZnO NCs by controlling the crystal size. Next, we describe device properties of the printed EL devices. Specifically, we present the impact on the use of pentaceneon the device properties; pentacene acts as the hole‐transport layer, resulting in the exciton emissions in EL. In addition, it passivates the rear surface of ZnO NC EML, which is effective in suppressing the green‐band EL. (© 2011 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)
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