Ligorio Giovanni, Cotella Giovanni F, Bonasera Aurelio, Zorn Morales Nicolas, Carnicella Giuseppe, Kobin Björn, Wang Qiankun, Koch Norbert, Hecht Stefan, List-Kratochvil Emil J W, Cacialli Franco
Humboldt-Universität zu Berlin, Institut für Physik, Institut für Chemie & IRIS Adlershof, Brook-Taylor-Straße 6, 12489 Berlin, Germany.
University College London, Department Physics and Astronomy and London Centre for Nanotechnology, London WC1H 0AH, UK.
Nanoscale. 2020 Mar 5;12(9):5444-5451. doi: 10.1039/d0nr00724b.
Self-assembled monolayers (SAMs) deposited on bottom electrodes are commonly used to tune charge carrier injection or blocking in optoelectronic devices. Beside the enhancement of device performance, the fabrication of multifunctional devices in which the output can be modulated by multiple external stimuli remains a challenging target. In this work, we report the functionalization of an indium tin oxide (ITO) electrode with a SAM of a diarylethene derivative designed for optically control the electronic properties. Following the demonstration of dense SAM formation and its photochromic activity, as a proof-of-principle, an organic light-emitting diode (OLED) embedding the light-responsive SAM-covered electrode was fabricated and characterized. Optically addressing the two-terminal device by irradiation with ultraviolet light doubles the electroluminescence. The original value can be restored reversibly by irradiation with visible light. This expanded functionality is based on the photoinduced modulation of the electronic structure of the diarylethene isomers, which impact the charge carriers' confinement within the emissive layer. This approach could be successfully exploited in the field of opto-communication technology, for example to fabricate opto-electronic logic circuits.
沉积在底部电极上的自组装单分子层（SAMs）通常用于调节光电器件中的电荷载流子注入或阻挡。除了提高器件性能外，制造能够通过多种外部刺激调制输出的多功能器件仍然是一个具有挑战性的目标。在这项工作中，我们报道了用一种设计用于光学控制电子性质的二芳基乙烯衍生物的SAM对氧化铟锡（ITO）电极进行功能化。在证明了致密SAM的形成及其光致变色活性之后，作为原理验证，制备并表征了嵌入光响应性SAM覆盖电极的有机发光二极管（OLED）。用紫外光照射对双端器件进行光学寻址可使电致发光加倍。通过可见光照射可以可逆地恢复原始值。这种扩展功能基于二芳基乙烯异构体电子结构的光致调制，这会影响发射层内电荷载流子的限制。这种方法可以在光通信技术领域成功应用，例如制造光电子逻辑电路。
