title: Photoluminescence changes of C70nano/submicro-crystals induced by high pressure and high temperature.
abstract: Hollow C70nano/submicro-crystals with a fcc lattice structure were treated under various high pressure and high temperature conditions. The energy band structure was visibly changed by the high pressure and high temperature treatment, and the luminescence of the treated C70nano/submicro-crystals were tuned from the visible to the near infrared range. In-situ high pressure experiments at room temperature indicate that pressure plays a key role in the tuning of the band gap and PL properties in C70nanocrystals, and temperature plays an important role in the formation of stable intermolecular bonds and thus to define the final red-shift of the PL peaks. The polymeric phases of C70nanocrystals treated at high pressure and high temperature were identified from their Raman spectra, which showed a change from monomers to a dimer-rich phase and finally to a phase containing larger, disordered C70oligomers.
authors.affiliation: School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116600, China.|State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, PR China.
authors.forename: Dedi
authors.initials: D
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, PR China.
authors.forename: Bingbing
authors.initials: B
authors.lastname: Liu
authors.affiliation: State Key Laboratory of Superhard Materials, Jilin University, Changchun 130012, PR China.|Department of Physics, Umeå University, S-90187 Umeå, Sweden.
authors.forename: Bertil
authors.initials: B
authors.lastname: Sundqvist
authors.affiliation: School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116600, China.
authors.forename: Dapeng
authors.initials: D
authors.lastname: Dong
authors.affiliation: School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116600, China.
authors.forename: Zhenghua
authors.initials: Z
authors.lastname: Li
authors.affiliation: School of Physics and Materials Engineering, Dalian Minzu University, Dalian 116600, China.
authors.forename: Dongping
authors.initials: D
authors.lastname: Liu