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The density distribution of localized states (DDLS) in monolayer graphene oxide (mGO) was observed and tuned under applied external electric field. The fluorescence anisotropy in mGO basal plane was observed which revealed the inhomogeneous DDLS. The enhanced and/or quenched fluorescence trajectories under electric field demonstrated the tuning of DDLS. Using the first-principles density-functional calculations, we demonstrated that the DDLS tuned by electric field could be attributed to the polarity effect of oxidized sp3 functional groups. The tunable DDLS is beneficial to improve and control the mGO's optoelectronic properties.

Observing and tuning the density distribution of localized states of monolayer graphene oxide by using external electric field