Top-Emission Organic Light-Emitting Diode with a Novel Copper/Graphene Composite Anode
Top-Emission Organic Light-Emitting Diode with a Novel Copper/Graphene Composite Anode
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具有新型铜/石墨烯复合阳极的顶发射有机发光二极管
DOI：
10.1002/adfm.201203283
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发表时间：
2013-07-12
影响因子：
19
通讯作者：
Qin, Guogang
中科院分区：
文献类型：
--
作者：
Meng, Hu;Luo, Jianxing;Qin, Guogang
与氧化铟锡（ITO）相比，石墨烯相对较高的薄层电阻阻碍了石墨烯作为透明电极在有机发光二极管中的应用。提出了一种新型的铜/石墨烯复合电极，并将其用作顶部发射有机电致发光二极管的阳极，其结构为Cu/graphene/V2O5/NPB/Alq（3）/Alq（3）：C545 T/Bphen：Cs2CO3/Sm/Au。采用化学气相沉积法在铜衬底上直接生长石墨烯，无需任何转移过程，制备了铜/石墨烯复合电极。典型的Cu/石墨烯复合阳极器件的电流效率和功率效率的最大值分别达到6.1 cd/A和7.6 lm/W，这明显高于石墨烯阳极、Cu阳极和ITO阳极的对照器件。复合电极的低薄层电阻、没有任何转移过程的高质量石墨烯以及避免玻璃或聚对苯二甲酸乙二醇酯基板中的波导损耗导致发光效率的改善。
The relatively high sheet resistance of graphene compared with indium tin oxide (ITO) blocks the applications of graphene as transparent electrodes in organic light-emitting diodes. A novel copper (Cu)/graphene composite electrode is presented and employed as the anode of a top-emission organic light-emitting diode with the structure of Cu/graphene/V2O5/NPB/Alq(3)/Alq(3): C545T/Bphen: Cs2CO3/Sm/Au. The Cu/graphene composite electrodes are fabricated by growing graphene directly on Cu substrates via the chemical vapor deposition method without any transfer process. The maxima of current efficiency and power efficiency of a typical Cu/graphene composite anode device reach 6.1 cd/A and 7.6 lm/W, respectively, which are markedly higher than those of the control devices with a graphene anode, a Cu anode or an ITO anode. The low sheet resistance of the composite electrode, the high quality of graphene without any transfer process and the avoidance of wave guiding loss in glass or polyethylene terephthalate substrates result in the improvements of light emission efficiencies.