Two-photon properties and excitation dynamics of poly(p-phenylenevinylene) derivatives carrying phenylanthracene and branched alkoxy pendents

S. J. Chung, G. S. Maciel, H. E. Pudavar, T. C. Lin, G. S. He, J. Swiatkiewicz, P. N. Prasad, D. W. Lee, J. I. Jin

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Abstract

This paper presents a study of excitation dynamics and two-photon properties in new branched poly(p-phenylenevinylene) structures which can be viewed as composed of interlinked structural units producing localized but interacting electronic excitations. Poly(p-phenylenevinylene) (PPV) derivatives, specifically poly[2-(9-phenylanthracen-10-yl)-1,4-phenylenevinylene] (P-1) and poly[2-(2-ethylhexyloxy)-5-(9-phenylanthracen-10-yl)-1,4-phenylenevinylene] (P-2), carrying 9-phenylanthracene pendent were prepared, and their one- and two-photon absorption and emission properties were studied in solution. P-1 and P-2 differ in structure by the presence of additional 2-ethylhexyloxy pendent groups in P-2. Both polymers were prepared by direct polymerization of the α,α'-dibromo-p-xylene monomers having the pendent group(s) in the present of excess potassium tert-butoxide. For the sake of comparison, 9,10-diphenylanthracene (DPA) and poly[2-methoxy-5-(2'-ethylhexyloxy)-1,4-phenylenevinylene] [Meh-PPV (P-3)] were also included in our study. From nanosecond and femtosecond nonlinear transmission measurements, their effective two-photon cross sections (σTPA) at ∼ 800 nm were found to be 11.9 × 10-20 for P-1, 66.6 × 10-20 for P-2, and 44.0 × 10-20 for P-3 in nanosecond pulses and 0.074 × 10-20 for P-1, 0.196 × 10-20 for P-2, and 0.168 × 10-20 cm4/GW for P-3 in femtosecond pulses, respectively. Their two-photon excitation spectra were also studied. P-2 having both the phenylanthrace and alkoxy pendents exhibits the best performance as a two-photon absorber in both of nano- and femtosecond measurements at ∼800 nm. Furthermore, a complete energy transfer from the pendent phenylanthracene moiety to the PPV backbone is observed.

Original languageEnglish
Pages (from-to)7512-7520
Number of pages9
JournalJournal of Physical Chemistry A
Volume106
Issue number33
DOIs
StatePublished - 22 Aug 2002

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