title: Tunable fluorescence in chromophore-functionalized nanodiamond induced by energy transfer.
abstract: Hybrid materials comprising diamond nanoparticles (ND) and oligo(phenylenevinylenes) (OPVs) have been synthesized by the covalent linking of acid-functionalized ND and OPV-amine. Chromophore-functionalized ND particles with long alkyl and π-conjugated groups are readily dispersed in various organic solvents without any precipitation after several hours. A careful study of the properties of the hybrid materials revealed an aggregation-induced energy transfer from the blue fluorescent nanodiamonds to green emitting OPVs. At very low concentrations the hybrid emits in the blue region, but as the concentration is increased a gradual transition from blue to green emission occurs. Competitive processes such as aggregation-induced enhanced emission and self-absorption have been ruled out and a molecular picture of the phenomenon is proposed. This strategy can open a plethora of new avenues for fluorescent nanodiamonds in optoelectronics and light harvesting apart from bio-imaging.
authors.affiliation: New Chemistry Unit, Jawaharlal Nehru Centre for Advanced Scientific Research (JNCASR), Jakkur P.O., Bangalore, 560064, India.
authors.forename: Urmimala
authors.initials: U
authors.lastname: Maitra
authors.forename: Ankit
authors.initials: A
authors.lastname: Jain
authors.forename: Subi J
authors.initials: SJ
authors.lastname: George
authors.forename: C N R
authors.initials: CN
authors.lastname: Rao
mesh_terms: D004735:Energy Transfer; D005453:Fluorescence; D005456:Fluorescent Dyes / Q000737:chemistry*; D008027:Light; D046529:Microscopy, Electron, Transmission; D008958:Models, Molecular; D058612:Nanodiamonds / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry; D012542:Scattering, Radiation; D013050:Spectrometry, Fluorescence; D013056:Spectrophotometry, Ultraviolet
chemical_list: D005456:Fluorescent Dyes; D058612:Nanodiamonds; D011145:Polyvinyls; C530822:oligo(p-phenylene vinylene)