Affiliation:
1. Shenyang National Laboratory for Materials Science Institute of Metal Research Chinese Academy of Sciences Shenyang 110016 P. R. China
2. School of Materials Science and Engineering University of Science and Technology of China Shenyang 110016 P. R. China
3. Faculty of Materials Science and Energy Engineering Shenzhen Institute of Advanced Technology Chinese Academy of Science Shenzhen 518055 P. R. China
4. Institute of Technology for Carbon Neutrality Shenzhen Institute of Advanced Technology Chinese Academy of Sciences Shenzhen 518055 P. R. China
Abstract
AbstractIntegrating a graphene transparent electrode (TE) matrix with driving circuits is essential for the practical use of graphene in optoelectronics such as active‐matrix organic light‐emitting diode (OLED) display, however it is disabled by the transport of carriers between graphene pixels after deposition of a semiconductor functional layer caused by the atomic thickness of graphene. Here, the carrier transport regulation of a graphene TE matrix by using an insulating polyethyleneimine (PEIE) layer is reported. The PEIE forms an ultrathin uniform film (≤10 nm) to fill the gap of the graphene matrix, blocking horizontal electron transport between graphene pixels. Meanwhile, it can reduce the work function of graphene, improving the vertical electron injection through electron tunneling. This enables the fabrication of inverted OLED pixels with record high current and power efficiencies of 90.7 cd A−1 and 89.1 lm W−1, respectively. By integrating these inverted OLED pixels with a carbon nanotube‐based thin‐film transistor (CNT‐TFT)‐driven circuit, an inch‐size flexible active‐matrix OLED display is demonstrated, in which all OLED pixels are independently controlled by CNT‐TFTs. This research paves a way for the application of graphene‐like atomically thin TE pixels in flexible optoelectronics such as displays, smart wearables, and free‐form surface lighting.
Funder
National Natural Science Foundation of China
Chinese Academy of Sciences
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry
Cited by
2 articles.
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