NDLI: Photon magic: chiroptical polarisation, depolarisation, inversion, retention and switching of non-photochromic light-emitting polymers in optofluidic medium

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Polymer Chemistry Vol - 6 Issue - 8

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Polymer Chemistry Vol - 6 Issue - 6

Polymer Chemistry Vol - 6 Issue - 5

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Polymer Chemistry Vol -1

Photon magic: chiroptical polarisation, depolarisation, inversion, retention and switching of non-photochromic light-emitting polymers in optofluidic medium

Content Provider	Royal Society of Chemistry (RSC)
Author	Zhao, Yin Zhang, Wei Nakao, Ayako Fujiki, Michiya Suzuki, Nozomu Donguri, Yuri Yoshida, Kana
Copyright Year	2015
Abstract	Circularly polarised (CP)-photons at six different energies (six wavelengths) were irradiated to non-photochromic, highly photoluminescent poly[(9,9-di-n-octylfluoren-2,7-diyl)-alt-bithiophene] (PF8T2) as μm-sized particles in chloroform–methanol cosolvents. This approach led to the capability of photophysically controlling all chiroptical polarisation, depolarisation, inversion, retention and switching in the ground and/or photoexcited states, as proven by circular dichroism (CD), optical rotation dispersion (ORD) and circularly polarised luminescence (CPL) spectroscopy. By optofluidically tuning the refractive index of the cosolvents at 589 nm (nD), these CP-photon induced CD signals were resonantly enhanced at a specific nD of ≈1.40. Surprisingly, regardless of the same l- (and r-) CP hand, the choice of higher and lower CP-photon energies led to a swapping of signs in chiroptical polarisation of the particles. The CP-photon hand, l- and r-, was not a deterministic factor for the induced chiroptical sign of the PF8T2 particles. This anomaly originates from CD inversion characteristics between lower and higher energy regions, supported by ZINDO calculations of PF8T2 model oligomers. Finally, controlled CP-photon sense and irradiating energy successfully allowed CPL-silent PF8T2 particles (quantum yield of 15%) to change to CPL-active particles of the order of \|gCPL\| = (1.9–4.3) × 10−3 at ≈535 nm whilst almost keeping the quantum yield of 8%.
Starting Page	1627
Ending Page	1638
Page Count	12
File Format	HTM / HTML PDF
ISSN	17599954
Volume Number	6
Issue Number	9
Journal	Polymer Chemistry
DOI	10.1039/c4py01337a
Language	English
Publisher	Royal Society of Chemistry
Access Restriction	Open
Subject Keyword	Spectroscopy Quantum Dispersion relation Photoluminescence Luminescence Optical rotation ZINDO CPL Circular dichroism
Content Type	Text
Resource Type	Article
Subject	Organic Chemistry Biochemistry Bioengineering Biomedical Engineering Polymers and Plastics

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