Anisotropic exciton relaxation in nanostructured metal (Zn and F16Zn)-phthalocyanine

Hyeyoung Ahn, Wei Hyun Liou, Huang-Ming Chen, Chia Hung Hsu

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

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.

Original languageEnglish
Pages (from-to)3230-3235
Number of pages6
JournalOptics Express
Volume23
Issue number3
DOIs
StatePublished - 9 Feb 2015

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