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, Tze Chiang Chen

Research output: Contribution to journalArticlepeer-review

229 Scopus citations

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.

Original languageEnglish (US)
Article number2294
JournalNature communications
Volume4
DOIs
StatePublished - 2013

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Biochemistry, Genetics and Molecular Biology
  • General Physics and Astronomy

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