The origin of photoluminescence from alpha-sexithienyl thin films

Article Abstract:

The nature of excited species which give rise to radiative emission may be studied by analyzing the photoluminescence (PL) from sublimed films of alpha-sexithienyl. Temperature-dependent measurements of the PL spectra show an apparent 530 cm-1 blue shift of the emission as the sample temperature decreases. The integrated PL intensity at 50 K is 1 order of magnitude larger than that at 300 K. Time-resolved PL spectra at 10 K indicate a fast energy transfer of excitons to lower lying trap states on the time scale of 250 picoseconds.

Optical properties, Photoluminescence, Radiative transfer

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Femtosecond differential transmission spectroscopy of alpha-sexithienyl single crystals at low temperature

Article Abstract:

The spectral relaxation of photogenerated excitations and the stimulated emission is studied in an alpha-sexithienyl single crystal using femtosecond differential transmission spectroscopy and time-resolved photoluminescence measurements at low temperature. Stimulated emission with amplification of the probe light which results in a positive differential transmission signal is found at two spectral positions for polarization parallel to the molecular c-axis.

Usage, Excited state chemistry, Luminescence

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Femtosecond differential transmission spectroscopy of alpha-sexithienyl thin film at low temperature

Article Abstract:

The influence of the charge-transfer state on the photogeneration of free charges in alpha-sexithienyl is reassessed. The femtosecond differential transmission spectroscopy on an alpha-sexithienyl film at low temperature is performed by covering a broad range of excitation energies.

Semiconductors and related devices, Semiconductor and Related Device Manufacturing, Thin Film Materials, Dielectric films, Chemical properties, Chemical compounds

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