Extremely efficient flexible organic light-emitting diodes with modified graphene anode
- Extremely efficient flexible organic light-emitting diodes with modified graphene anode
- Tae-Hee Han; Youngbin Lee; Mi-Ri Choi; Seong-Hoon Woo; Sang-Hoon Bae; Byung-Hee Hong; Ahn, JH; Lee, TW
- Date Issued
- Nature Publishing Group
- Although graphene films have a strong potential to replace indium tin oxide anodes in organic light-emitting diodes (OLEDs), to date, the luminous efficiency of OLEDs with graphene anodes has been limited by a lack of efficient methods to improve the low work function and reduce the sheet resistance of graphene films to the levels required for electrodes(1-4). Here, we fabricate flexible OLEDs by modifying the graphene anode to have a high work function and low sheet resistance, and thus achieve extremely high luminous efficiencies (37.2 lm W-1 in fluorescent OLEDs, 102.7 lm W-1 in phosphorescent OLEDs), which are significantly higher than those of optimized devices with an indium tin oxide anode (24.1 lm W-1 in fluorescent OLEDs, 85.6 lm W-1 in phosphorescent OLEDs). We also fabricate flexible white OLED lighting devices using the graphene anode. These results demonstrate the great potential of graphene anodes for use in a wide variety of high-performance flexible organic optoelectronics.
- TRANSPARENT ELECTRODES; LARGE-AREA; FILMS; OXIDE; OPTOELECTRONICS; INJECTION; DEVICES; CELLS
- Article Type
- NATURE PHOTONICS, vol. 6, no. 2, page. 105 - 110, 2012-02
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