Efficient three-photon excited deep blue photoluminescence and lasing of diphenylamino and 1,2,4-triazole endcapped oligofluorenes

Po Lam Wu, Xin Jiang Feng, Hoi Lam TAM, Ricky M S WONG, Kok Wai CHEAH

Research output: Contribution to journalArticlepeer-review

90 Citations (Scopus)

Abstract

A novel homologues series of diphenylamino and 1,2,4-triazole endcapped @-conjugated oligofluorenes has been synthesized using palladium-catalyzed Suzuki cross-coupling of 9,9-dibutyl-7-(diphenylamino)-2-fluorenylboronic acid, and 1,2,4,-triazole-substituted oligofluorenyl halide was used as a key step. Efficient two- and three-photon excited photoluminescence and lasing were obtained by pumping with near-infrared femto-second lasers. The three-photon absorption cross-section enhances significantly up to 2.48 × 10 -78 cm6 s2 in the femtosecond regime with the length of the conjugation system. The emission is in the deep blue region and the best full width half-maximum (fwhm) of the three-photon lasing is narrower than 6 nm which is the narrowest ever reported. It was also shown that the nonlinear optics (NLO) effect increased parabolically with the conjugation length but without changing the emission wavelength. This demonstrates that varying the conjugation length is a very effective way to tailor an OF-based NLO device for deep blue application. Our findings open a new avenue to design highly efficient multiphoton absorption molecules for photoluminescence and lasing as well as provide a novel series of organic molecules that can be used in NLO applications and fundamental study.

Original languageEnglish
Pages (from-to)886-887
Number of pages2
JournalJournal of the American Chemical Society
Volume131
Issue number3
DOIs
Publication statusPublished - 28 Jan 2009

Scopus Subject Areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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