The Organic Photonics and Electronics Group, Department of Physics, Umeå University, SE-901 87 Umeå, Sweden.
ACS Nano. 2011 Jan 25;5(1):574-80. doi: 10.1021/nn102704h. Epub 2010 Dec 28.
We report flexible and metal-free light-emitting electrochemical cells (LECs) using exclusively solution-processed organic materials and illustrate interesting design opportunities offered by such conformable devices with transparent electrodes. Flexible LEC devices based on chemically derived graphene (CDG) as the cathode and poly(3,4-ethylenedioxythiophene) mixed with poly(styrenesulfonate) as the anode exhibit a low turn-on voltage for yellow light emission (V = 2.8 V) and a good efficiency 2.4 (4.0) cd/A at a brightness of 100 (50) cd/m(2). We also find that CDG is electrochemically inert over a wide potential range (+1.2 to -2.8 V vs ferrocene/ferrocenium) and exploit this property to demonstrate planar LEC devices with CDG as both the anode and the cathode.
我们报告了一种灵活且无金属的发光电化学电池（LEC），它完全使用溶液处理的有机材料，并展示了这种可弯曲器件提供的有趣设计机会，这些器件具有透明电极。基于化学衍生石墨烯（CDG）作为阴极和聚（3,4-乙二氧基噻吩）与聚（苯乙烯磺酸盐）混合作为阳极的柔性 LEC 器件，在黄光发射时具有低开启电压（V = 2.8 V）和良好的效率 2.4（4.0）cd/A，亮度为 100（50）cd/m(2)。我们还发现 CDG 在很宽的电位范围内（相对于 ferrocene/ferrocenium 为+1.2 至-2.8 V）是电化学惰性的，并利用这一特性展示了具有 CDG 作为阳极和阴极的平面 LEC 器件。
