Frequency-Upconverted Stimulated Emission by Up to Six-Photon Excitation from Highly Extended Spiro-Fused Ladder-Type Oligo(p-phenylene)s

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

*Corresponding author for this work

Research output: Contribution to journalJournal articlepeer-review

57 Citations (Scopus)


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 π-conjugation was evaluated as 8.67×10−169 cm12 s5 photon−5. Exceptionally efficient 2- to 6-photon excited stimulated emission was achieved under near-infrared laser excitation.

Original languageEnglish
Pages (from-to)10007-10015
Number of pages9
JournalAngewandte Chemie. International Edition
Issue number18
Early online date21 Jan 2021
Publication statusPublished - 26 Apr 2021

Scopus Subject Areas

  • Catalysis
  • Chemistry(all)

User-Defined Keywords

  • frequency-upconverted stimulated emission
  • MPA cross-section
  • multiphoton absorption (MPA)
  • oligo(p-phenylene)s
  • spiro-fused molecules


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