Anisotropic exciton relaxation in nanostructured metal (Zn and F_16Zn)-phthalocyanine | Zendy

Hyeyoung Ahn | Zendy; Wei-Hyun Liou | Zendy; HuangMing Philip Chen | Zendy; ChiaHung Hsu | Zendy

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Anisotropic exciton relaxation in nanostructured metal (Zn and F_16Zn)-phthalocyanine

Author(s) -

Hyeyoung Ahn,

Wei-Hyun Liou,

HuangMing Philip Chen,

ChiaHung Hsu

Publication year - 2015

Publication title -

optics express

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 1.394

H-Index - 271

ISSN - 1094-4087

DOI - 10.1364/oe.23.003230

Subject(s) - exciton , nanorod , materials science , anisotropy , picosecond , phthalocyanine , excited state , singlet state , relaxation (psychology) , polarization (electrochemistry) , molecular physics , condensed matter physics , optics , atomic physics , nanotechnology , physics , chemistry , laser , psychology , social psychology

We report ultrafast excited state dynamics of zinc phthalocyanine and zinc hexadecafluoro phthalocyanine thin films which have nanorod-like structures. Excitons in the singlet states undergo multi-exponential relaxation processes to the ground state and the singlet lifetime within a few tens of picoseconds is attributed to the diffusion-limited exciton annihilation process. Diffusive migration of the singlet excitons shows the anisotropic lifetimes depending on the polarization of probe beam. Similar anisotropy is observed in the X-ray diffraction data which exhibits long-range alignment of molecular columns along the long axis of nanorod, whereas disordered arrangement in lateral direction to the axis of nanorod.

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