The light-emitting electrochemical cell (LEC) has demonstrated capacity for cost- and material-efficient solution-based fabrication of the active material under ambient air. In this context, it is notable that corresponding reports on a scalable solution-based fabrication of the electrodes, particularly the top electrode, are rare. We address this issue through the demonstration of a transparent LEC, which is fabricated under ambient air by sequential spray deposition of a hydrophobic conjugated-polymer:ionic-liquid blend ink as the active material and a hydrophilic poly(3,4-ethylenedioxythiophene):poly(styrene sulfonate) ink as the transparent top electrode. Such an optimized LEC delivers a luminance of 360 cd/m² at a power efficacy of 1.6 lm/W, which is on par with the performance of a corresponding LEC device equipped with a vacuum-deposited and reflective metal top electrode. This implies that the entire LEC device indeed can be fabricated with solution-based processes and deliver a good performance, which is critical if the LEC technology is going to fulfil its low-cost potential.

发光电化学电池（LEC）具有在环境空气下以成本和材料效率高的解决方案方式制造活性材料的能力。在这种情况下，值得注意的是，有关基于电极的可伸缩解决方案制造的报告，尤其是顶部电极的报告很少。我们通过演示透明LEC解决了这个问题，该透明LEC是在环境空气中通过依次喷涂疏水性共轭聚合物：离子液体共混油墨作为活性材料和亲水性聚（3,4-乙撑二氧噻吩）制成的：聚（苯乙烯磺酸盐）墨水作为透明顶部电极。这样优化的LEC可以提供360 cd / m ²的亮度功率效率为1.6 lm / W，与配备有真空沉积和反射金属顶部电极的相应LEC设备的性能相当。这意味着整个LEC器件确实可以采用基于解决方案的工艺制造，并具有良好的性能，这对于LEC技术要发挥其低成本潜力至关重要。