Efficient and bright organic light-emitting diodes on single-layer graphene electrodes

Ning Li (), Satoshi Oida, George S. Tulevski, Shu-Jen Han, James B. Hannon, Devendra K. Sadana and Tze-Chiang Chen
Additional contact information
Ning Li: IBM T.J. Watson Research Center
Satoshi Oida: IBM T.J. Watson Research Center
George S. Tulevski: IBM T.J. Watson Research Center
Shu-Jen Han: IBM T.J. Watson Research Center
James B. Hannon: IBM T.J. Watson Research Center
Devendra K. Sadana: IBM T.J. Watson Research Center
Tze-Chiang Chen: IBM T.J. Watson Research Center

Nature Communications, 2013, vol. 4, issue 1, 1-7

Abstract: Abstract Organic light-emitting diodes are emerging as leading technologies for both high quality display and lighting. However, the transparent conductive electrode used in the current organic light-emitting diode technologies increases the overall cost and has limited bendability for future flexible applications. Here we use single-layer graphene as an alternative flexible transparent conductor, yielding white organic light-emitting diodes with brightness and efficiency sufficient for general lighting. The performance improvement is attributed to the device structure, which allows direct hole injection from the single-layer graphene anode into the light-emitting layers, reducing carrier trapping induced efficiency roll-off. By employing a light out-coupling structure, phosphorescent green organic light-emitting diodes exhibit external quantum efficiency >60%, while phosphorescent white organic light-emitting diodes exhibit external quantum efficiency >45% at 10,000 cd m−2 with colour rendering index of 85. The power efficiency of white organic light-emitting diodes reaches 80 lm W−1 at 3,000 cd m−2, comparable to the most efficient lighting technologies.

Date: 2013
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DOI: 10.1038/ncomms3294

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