Ultra-smooth and robust graphene-based hybrid anode for high-performance flexible organic light-emitting diodes,Journal of Materials Chemistry C

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Ultra-smooth and robust graphene-based hybrid anode for high-performance flexible organic light-emitting diodes
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-12-30 , DOI: 10.1039/d0tc05213b
Zhikun Zhang _{1,

2,

3,

4,

5} , Lianlian Xia _{5,

6,

7,

8,

9} , Lizhao Liu _{5,

10,

11,

12} , Yuwen Chen _{5,

13,

14,

15,

16} , Zuozhi Wang _{1,

2,

3,

4,

5} , Wei Wang _{1,

2,

3,

4,

5} , Dongge Ma _{5,

13,

14,

15,

16} , Zhaoping Liu _{1,

2,

3,

4,

5}

Affiliation

CAS Engineering Laboratory for Graphene
Ningbo Institute of Materials Technology and Engineering
Chinese Academy of Sciences
Zhejiang 315201
P. R. China
State Key Laboratory of Chemical Engineering
College of Chemical and Biological Engineering
Zhejiang University
Hangzhou 310027
Key Laboratory of Materials Modification by Laser, Ion and Electron Beams (Ministry of Education)
Dalian University of Technology
Dalian 116024
Institute of Polymer Optoelectronic Materials and Devices
State Key Laboratory of Luminescent Materials and Devices
South China University of Technology
Guangzhou 510640

Large surface roughness, especially caused by the large particles generated during both the transfer and the doping processes of graphene grown by chemical vapor deposition (CVD) is always a critical issue that impedes the utility of graphene in the next-generation flexible thin-film opto-electronic devices such as organic light-emitting diodes (OLEDs), because it yields pinhole defects, leakage current, and electrical shorts, etc., causing non-emitting areas and device performance degradation over time. Here, an extremely smooth and robust PEDOT:PSS/graphene/PET hybrid anode is reported, prepared by direct and polymer-free transfer of CVD-grown graphene onto the smooth PET substrate. Flexible OLEDs with such hybrid anodes have the maximum brightness, current efficiency (CE) and power efficiency (PE), as high as 19 000 cd m⁻², 76 cd A⁻¹ and 61 lm W⁻¹, respectively, which are superior to those of the ITO/glass-based OLEDs. Moreover, a 2.5-inch monolithic flexible OLED has been successfully fabricated. The luminescence is very uniform and no dark spots are observed in the unencapsulated OLEDs, demonstrating the effectiveness of our strategies and the great prospect of graphene-based flexible OLEDs in the future foldable and rollable displays.

中文翻译：

适用于高性能柔性有机发光二极管的超光滑，坚固的石墨烯基混合阳极

大的表面粗糙度，特别是由在化学气相沉积（CVD）生长的石墨烯的转移和掺杂过程中产生的大颗粒所引起的，始终是一个关键问题，阻碍了石墨烯在下一代柔性薄膜光电二极管中的应用-电子设备，例如有机发光二极管（OLED），因为它会产生针孔缺陷，漏电流和电短路等。，这会导致非发光区域和设备性能随时间下降。在这里，报道了一种非常光滑且坚固的PEDOT：PSS /石墨烯/ PET杂化阳极，它是通过将CVD生长的石墨烯直接和无聚合物转移到光滑的PET基材上而制备的。具有此类混合阳极的柔性OLED具有最高的亮度，电流效率（CE）和功率效率（PE），高达19 000 cd m ^-2，76 cd A ^-1和61 lm W ^-1分别优于基于ITO /玻璃的OLED。而且，已经成功地制造了2.5英寸的单片柔性OLED。发光非常均匀，在未封装的OLED中没有观察到黑点，这证明了我们的策略的有效性以及基于石墨烯的柔性OLED在未来可折叠和可卷曲显示器中的广阔前景。

更新日期：2021-01-20

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