基于柔性石墨烯的电致发光器件。

Flexible graphene-based electroluminescent devices.

机构信息

State Key Laboratory of Electronic Thin Films and Integrated Devices, University of Electronic Science and Technology of China, Chengdu 610054, China.

出版信息

ACS Nano. 2011 Sep 27;5(9):7149-54. doi: 10.1021/nn2018649. Epub 2011 Aug 23.

DOI:10.1021/nn2018649

PMID:21842851

Abstract

For the first time, large-area CVD-grown graphene films transferred onto flexible PET substrates were used as transparent conductive electrodes in alternating current electroluminescence (ACEL) devices. The flexible ACEL device based on a single-layer graphene electrode has a turn-on voltage of 80 V; at 480 V (16 kHz), the luminance and luminous efficiency are 1140 cd/m(2) and 5.0 lm/W, respectively. The turn-on voltage increases and the luminance decreases with increasing stacked layers of graphene, which means the single-layer graphene is the best optimal choice as the transparent conductive electrode. Furthermore, it demonstrates that the graphene-based ACEL device is highly flexible and can work very well even under a very large strain of 5.4%, suggesting great potential applications in flexible optoelectronics.

摘要

首次将大面积化学气相沉积（CVD）生长的石墨烯薄膜转移到柔性聚对苯二甲酸乙二醇酯（PET）衬底上，用作交流电致发光（ACEL）器件中的透明导电电极。基于单层石墨烯电极的柔性 ACEL 器件的开启电压为 80 V；在 480 V（16 kHz）时，亮度和发光效率分别为 1140 cd/m²和 5.0 lm/W。随着石墨烯堆叠层数的增加，开启电压增加，亮度降低，这意味着作为透明导电电极，单层石墨烯是最佳的选择。此外，该研究表明基于石墨烯的 ACEL 器件具有高柔韧性，即使在 5.4%的大应变下也能很好地工作，这表明其在柔性光电子学中有很大的应用潜力。