Synthesis and Study of Fullerene-Based Photovoltaic and Two-Photon Absorptive Conjugate Materials
Abstract
We have achieved in the synthesis of several modified fluorenated monoadducts of C(exp 60) showing high cross-sections of two-photon absorption (TPA). Conclusively, we substantiated our proposal that multi-adduct chromophore structures in close vicinity of the C(EXP 60) cage may mimicking the extra-dimensionality of chromophores in 3D configuration, and thus contribute to the enhanced two-photon absorption optical properties. Accordingly for this study, several monoadducts and novel multiadduct analogues of C(EXP 60)-diphenylaminofluorene C(EXP 60)(>DPAF)n derivatives were synthesized and characterized by various spectroscopic methods. In summary, effective molecular TPA cross-sections of one branched alkyl derivative C60(>DPAF-C(sub 9)) in CS2 was found to be 251 x lO(sub-48) cm4-sec/molecule, which is slightly higher than the TPA cross-sections value (196 x lO(sub-48) cm4-sec/molecule) obtained for our first generation C60(>DPAF-C2) monoadduct. It is more than double in the cross-sections of its parent linear DPAF analogue and in a comparable value with that of the current TPA benchmark octupolar analogue AF350 with sigma2' =278 xlO(sub-48) cm4-sec/molecule. As the structure of C60-diphenylaminofluorene conjugate is extended from monoadduct to bisadduct analogous, effective molecular TPA cross-sections of C60(>DPAF-C9)2 was found to be 622 xlO(sub-48) cm4-sec/molecule. This cross-sections value becomes one of the highest obtained for many organicpolyaromatic chromophores to date.
Document Details
- Document Type
- Technical Report
- Publication Date
- May 31, 2004
- Accession Number
- ADA424360
Entities
People
- Long Y Chiang
Organizations
- University of Massachusetts Lowell