Fs-dynamics of charge-transfer excited states in anthracene–PMDA single crystals

• Published in: Journal of luminescence Vol. 110; no. 4; pp. 315 - 324
• Main Authors: Port, H., Hartschuh, A.
• Format: Journal Article Conference Proceeding
• Language: English
• Published: Amsterdam Elsevier B.V 01.12.2004; Elsevier
• Subjects: Condensed matter: electronic structure, electrical, magnetic, and optical properties; CT crystals; Exact sciences and technology; Excitonic strings; Optical properties and condensed-matter spectroscopy and other interactions of matter with particles and radiation; Optical properties of bulk materials and thin films; Physics; Polarized transient absorption; Excitonic strings; Polarized transient absorption; 71.20; CT crystals; 82.30.F; 71.35.C; Anthracene; Ground states; 82.30.F Excitonic strings; Organic anhydride; Transients; Monocrystals; Optical polarization; Stimulated emission; Excitons; Charge transfer complexes; Absorption spectra; Charge transfer; Photoexcitation; PMDA
• ISSN: 0022-2313; 1872-7883
• DOI: 10.1016/j.jlumin.2004.08.027

Single crystals of the weak charge-transfer (CT) complex anthracene–PMDA have been studied by fs transient absorption spectroscopy in the temperature range between 295 and 10 K. Upon variation of the probe light polarization the complete set of transient CT-signals is identified (transient absorption of the CT-state, stimulated emission and transient bleaching), for the first time in CT single crystals. The formation of the CT-state after photoexcitation occurs faster than 150 fs without precursor, independent of temperature and excitation energy. An additional transient signal is clearly differentiated and described quantitatively by dipole-induced shifts of the ground state absorption.