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Frequency-Upconverted Stimulated Emission by Up to Six-Photon Excitation from Highly Extended Spiro-Fused Ladder-Type Oligo

Lai, Wen-Yong ; Tam, Hoi Lam ; Wong, Ka-Leung ; Cheah, Kok Wai ; Gao, Kun ; Jiang, Yi ; Huang, Wei ; Li, King Fai ; Lin, He ; Shu, Yu ; Liu, Yuan-Yuan

Angewandte Chemie (International ed.), 2021-04, Vol.60 (18) [Periódico revisado por pares]

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  • Título:
    Frequency-Upconverted Stimulated Emission by Up to Six-Photon Excitation from Highly Extended Spiro-Fused Ladder-Type Oligo
  • Autor: Lai, Wen-Yong ; Tam, Hoi Lam ; Wong, Ka-Leung ; Cheah, Kok Wai ; Gao, Kun ; Jiang, Yi ; Huang, Wei ; Li, King Fai ; Lin, He ; Shu, Yu ; Liu, Yuan-Yuan
  • Assuntos: Fluorescence
  • É parte de: Angewandte Chemie (International ed.), 2021-04, Vol.60 (18)
  • Descrição: Keywords: frequency-upconverted stimulated emission; MPA cross-section; multiphoton absorption (MPA); oligo(p-phenylene)s; spiro-fused molecules Frequency-upconverted fluorescence and stimulated emission induced by multiphoton absorption (MPA) have attracted much interest. As compared with low-order MPA processes, the construction of high-order MPA processes is highly desirable and rather attractive, yet remains a formidable challenge due to its inherent low transition probability. We report the observation of the first experimental frequency-upconverted fluorescence and stimulated emission by simultaneous six-photon excitation in an organic molecular system. The well-designed organic conjugated system based on cross-shaped spiro-fused ladder-type oligo(p-phenylene)s (SpL-z, z=1-3) manifests reasonably high MPA cross-sections and brilliant luminescence emission simultaneously. The six-photon absorption cross-section of SpL-3 with an extended I-conjugation was evaluated as 8.67x10.sup.-169 cm.sup.12s.sup.5photon.sup.-5. Exceptionally efficient 2- to 6-photon excited stimulated emission was achieved under near-infrared laser excitation. Article Note: These authors contributed equally to this work. Supporting information: Additional Supporting Information may be found in the online version of this article As a service to our authors and readers, this journal provides supporting information supplied by the authors. Such materials are peer reviewed and may be re-organized for online delivery, but are not copy-edited or typeset. Technical support issues arising from supporting information (other than missing files) should be addressed to the authors. CAPTION(S): Supplementary Byline: ,, Kun Gao, He Lin, Hoi Lam Tam, Yuan-Yuan Liu, Yu Shu, Ka-Leung Wong, Wen-Yong Lai, Kok Wai Cheah, Wei Huang
  • Editor: Wiley Subscription Services, Inc
  • Idioma: Inglês
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