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Polarization dependences of absorption and luminescence spectra on each crystal face of α‐quaterthiophene and α‐quinquethiophene
Author(s) -
Tanaka Shin,
Katano Yoshitaka,
Kimura Yuki,
Yoshinari Takehisa,
Nagasaka Shinichiro,
Itoh Hiroki,
Kuriyama Yasunao
Publication year - 2010
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201026019
Subject(s) - excited state , exciton , transition dipole moment , luminescence , absorption spectroscopy , dipole , polarization (electrochemistry) , crystal (programming language) , spectral line , homo/lumo , molecular physics , atomic physics , chemistry , materials science , molecule , optics , physics , condensed matter physics , optoelectronics , organic chemistry , astronomy , computer science , programming language
Polarization dependence of the absorption spectra (ABS) and the luminescence spectra in α‐quaterthiophene (4T) and α‐quinquethiophene (5T) has been measured directly with near normal incident light on the ab , bc , and ca crystal planes of their thick single crystals (SCs). Vibronic excitons (Frenkel excitons) have been observed on each crystal plane of 4T and 5T. The polarizations of the ABS are consistent with the prediction obtained from the MOPAC calculations of the transition dipole moment directions of the molecules in the SCs. Excited electron relaxes to the lowest excited state which is composed of the LUMO states.