title: Mn²+-bonded reduced graphene oxide with strong radiative recombination in broad visible range caused by resonant energy transfer.
abstract: The photoluminescence (PL) characteristics of Mn(2+)-bonded reduced graphene oxide (rGO) are studied in details. The Mn(2+)-bonded rGO is synthesized using MnO(2)-decorated GO as the intermediate products and ideal tunable PL is obtained by enhancing the long-wavelength (450-550 nm) emission. The PL spectra excited by different wavelengths are analyzed to elucidate the mechanism, and the resonant energy transfer between Mn(2+) and sp(2) clusters of the rGO appears to be responsible for the enhanced long-wavelength emission. To examine the effect of Mn(2+) on the long-wavelength emission from the Mn(2+)-bonded rGO, the PL characteristics of Mn(2+)-bonded rGO with smaller Mn concentrations are studied and weaker emission is observed. Our theoretical calculation corroborates the experimental results.
authors.affiliation: National Laboratory of Solid State Microstructures and Department of Physics, Nanjing University, Nanjing 210093, People's Republic of China.
authors.forename: Z X
authors.initials: ZX
authors.lastname: Gan
authors.forename: S J
authors.initials: SJ
authors.lastname: Xiong
authors.forename: X L
authors.initials: XL
authors.lastname: Wu
authors.forename: C Y
authors.initials: CY
authors.lastname: He
authors.forename: J C
authors.initials: JC
authors.lastname: Shen
authors.forename: Paul K
authors.initials: PK
authors.lastname: Chu
mesh_terms: D004735:Energy Transfer; D004867:Equipment Design; D006108:Graphite / Q000737:chemistry*; D049449:Luminescence; D008345:Manganese / Q000737:chemistry*; D046529:Microscopy, Electron, Transmission / Q000379:methods; D008956:Models, Chemical; D049329:Nanostructures / Q000737:chemistry; D010087:Oxides / Q000737:chemistry*; D010777:Photochemistry / Q000379:methods; D011789:Quantum Theory; D017550:Spectroscopy, Fourier Transform Infrared / Q000379:methods; D013696:Temperature
chemical_list: D010087:Oxides; D008345:Manganese; D006108:Graphite