The continuous tuning of the emission spectrum of a single light-emitting diode (LED) by an external electrical bias is of great technological significance as a crucial property in high-quality displays, yet this capability has not been demonstrated in existing LEDs. Graphene, a tunable optical platform, is a promising medium to achieve this goal. Here we demonstrate a bright spectrally tunable electroluminescence from blue (∼450 nm) to red (∼750 nm) at the graphene oxide/reduced-graphene oxide interface. We explain the electroluminescence results from the recombination of Poole–Frenkel emission ionized electrons at the localized energy levels arising from semi-reduced graphene oxide, and holes from the top of the π band. Tuning of the emission wavelength is achieved by gate modulation of the participating localized energy levels. Our demonstration of current-driven tunable LEDs not only represents a method for emission wavelength tuning but also may find applications in high-quality displays. Wavelength tuning of a light emitting diode (LED) by an external electrical bias would benefit display technologies. Here, Wang et al. demonstrate wavelength-tuning from blue to the near-infrared in an all-graphene-based field effect LED by gate modulation
A spectrally tunable all-graphene-based flexible field-effect light-emitting device
Xiaomu Wang,H. Tian,M. A. Mohammad,Cheng Li,Can Wu,Yi Yang,T. Ren
Published 2015 in Nature Communications
ABSTRACT
PUBLICATION RECORD
- Publication year
2015
- Venue
Nature Communications
- Publication date
2015-07-16
- Fields of study
Medicine, Materials Science, Physics, Engineering
- Identifiers
- External record
- Source metadata
Semantic Scholar, PubMed
CITATION MAP
EXTRACTION MAP
CLAIMS
- No claims are published for this paper.
CONCEPTS
- No concepts are published for this paper.
REFERENCES
Showing 1-31 of 31 references · Page 1 of 1