Letter www.acsami.org
Gate-Tunable Electron Injection Based Organic Light-Emitting Diodes for Low-Cost and Low-Voltage Active Matrix Displays Xinning Luan,†,‡ Jiang Liu,†,‡,§ Qibing Pei,§ Guillermo C. Bazan,⊥ and Huaping Li*,‡ ‡
Atom Nanoelectronics Inc. 440 Hindry Avenue, Unit E, Inglewood California 90301, United States Department of Materials Science and Engineering, University of California, Los Angeles California 90095, United States ⊥ Department of Materials and Chemistry & Biochemistry, University of California, Santa Barbara California 93106, United States §
S Supporting Information *
ABSTRACT: Low-cost and low-voltage active matrix displays were fabricated by simply patterning gate electrode arrays on a polymer electrolyte (PE)-coated polymer light-emitting diode (PLED). Structurally, a PE capacitor seamlessly stacked on a PLED by sharing a common Al:LiF composite electrode (PEC|PLED). This monolithic integrated organic optoelectronic device was characterized and interpreted as the tunable work function (surface potential) because of the perturbation of accumulated ions on Al:LiF composite electrode by PEC charging and discharging. The modulation of electron injection by the PEC resulted in increases in the electroluminescent brightness, from 8000 cd m−2, and the external quantum efficiency from
