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

Authors :
Jiang, Yi
Li, King Fai
Gao, Kun
Lin, He
Tam, Hoi Lam
Liu, Yuan‐Yuan
Shu, Yu
Wong, Ka‐Leung
Lai, Wen‐Yong
Cheah, Kok Wai
Huang, Wei
Source :
Angewandte Chemie International Edition; 4/26/2021, Vol. 60 Issue 18, p10007-10015, 9p
Publication Year :
2021

Abstract

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. [ABSTRACT FROM AUTHOR]

Details

Language :
English
ISSN :
14337851
Volume :
60
Issue :
18
Database :
Complementary Index
Journal :
Angewandte Chemie International Edition
Publication Type :
Academic Journal
Accession number :
149959655
Full Text :
https://doi.org/10.1002/anie.202100542