Three-photon absorption enhancement in a symmetrical charge transfer fluorene derivative

Florencio E. Hernández, Kevin D. Belfield, Ion Cohanoschi

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69 Scopus citations


In this letter we report the three-photon absorption-induced upconversion fluorescence emission and the three-photon absorption cross-section of two fluorene derivatives with D-π-D (9,9-didecyl-2,7-bis-(N,N-diphenylamino) fluorene) and D-π-A ((7-benzothiazol-2-yl-9,9-didecylfluoren-2-yl) diphenylamine) structural motifs. The three-photon absorption cross-section of the D-π-D analog (σ3=82×10 -78 cm6s2photon-2) is 2.2 times greater than that of its D-π-A counterpart (σ3 =37×10-78 cm6s 2photon-2), showing that symmetric charge transfer enhances 3PA. The three-photon-excitation of these two compounds in hexane solution (9.8×10-3 M) was accomplished with a tunable OPG pumped by picosecond laser pulses. The three-photon absorption coefficients were measured using an open aperture Z-scan technique.

Original languageEnglish (US)
Pages (from-to)22-26
Number of pages5
JournalChemical Physics Letters
Issue number1-3
StatePublished - Jun 11 2004
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy
  • Physical and Theoretical Chemistry


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