Femtosecond regular reflection spectroscopic study on ultrafast photoinduced heat generation in copper phthalocyanine solid

Yoichiroh Hosokawa, Kazuya Watanabe, Tsuyoshi Asahi, Hiroshi Fukumura, Hiroshi Masuhara*

*Corresponding author for this work

Research output: Contribution to journalArticle

11 Scopus citations

Abstract

A femtosecond regular reflection spectroscopic system was developed and applied to a β-copper phthalocyanine (β-CuPc) pellet. Transient regular reflection spectra were converted into extinction coefficient change (Δk) ones, which correspond to transient absorption spectra, by using Kramers- Kronig transformation. The Δk spectrum observed immediately after excitation was assigned to the excited state of β-CuPc solid, which relaxed by an exciton-exciton annihilation. The spectra remaining over several nanoseconds were assigned to a hot band due to a vibrationally excited state of the electronically ground state. We have clarified that a fast photothermal conversion process is induced by the exciton-exciton annihilation, which was analyzed by a simulation using a time dependent rate (proportional to t(- 1/2)) of the annihilation.

Original languageEnglish
Pages (from-to)909-914
Number of pages6
JournalBulletin of the Chemical Society of Japan
Volume72
Issue number5
DOIs
StatePublished - 1 May 1999

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