%0 Journal Article %1 Pinteri__2020 %A Pinteric, Marko %A Roh, Seulki %A Uykur, Ece %A Hansen, Nis Hauke %A Pflaum, Jens %A Stolte, Matthias %A Würthner, Frank %A Dressel, Martin %D 2020 %I American Chemical Society (ACS) %J The Journal of Physical Chemistry C %K myown %N 32 %P 17829--17835 %R 10.1021/acs.jpcc.0c05165 %T Trapped Exciton and Large Birefringence in Cl2–NDI Revealed by Optical Spectroscopy %U https://doi.org/10.1021%2Facs.jpcc.0c05165 %V 124 %X The n-type organic semiconductor, β-phase single crystalline dichloro naphthalene diimide, Cl2–NDI, is investigated in a broad frequency range via optical spectroscopy. The temperature-dependent absorbance spectra reveal the appearance of new molecular vibration modes; several of them exhibit a pronounced splitting and abnormal red shift. In the visible spectral range, we observe a splitting of the J-band upon cooling, which we attributed to self-trapped excitons via coupling between free excitons and molecular vibrations or trapping by disorder induced Lévy states. Additionally, we discover a strong birefringence of these crystals by pronounced polarization beat over a wide frequency range.

@article{Pinteri__2020, abstract = {The n-type organic semiconductor, β-phase single crystalline dichloro naphthalene diimide, Cl2–NDI, is investigated in a broad frequency range via optical spectroscopy. The temperature-dependent absorbance spectra reveal the appearance of new molecular vibration modes; several of them exhibit a pronounced splitting and abnormal red shift. In the visible spectral range, we observe a splitting of the J-band upon cooling, which we attributed to self-trapped excitons via coupling between free excitons and molecular vibrations or trapping by disorder induced Lévy states. Additionally, we discover a strong birefringence of these crystals by pronounced polarization beat over a wide frequency range.}, added-at = {2020-09-01T08:34:23.000+0200}, author = {Pinteric, Marko and Roh, Seulki and Uykur, Ece and Hansen, Nis Hauke and Pflaum, Jens and Stolte, Matthias and Würthner, Frank and Dressel, Martin}, biburl = {https://www.bibsonomy.org/bibtex/2552770c54d326a14c18f17eb80828ff6/wuerthner_group}, doi = {10.1021/acs.jpcc.0c05165}, interhash = {0762c5905fdce5a94c8a5ddaa78fccdb}, intrahash = {552770c54d326a14c18f17eb80828ff6}, journal = {The Journal of Physical Chemistry C}, keywords = {myown}, month = jul, number = 32, pages = {17829--17835}, publisher = {American Chemical Society ({ACS})}, timestamp = {2020-09-17T09:06:29.000+0200}, title = {Trapped Exciton and Large Birefringence in Cl2–NDI Revealed by Optical Spectroscopy}, url = {https://doi.org/10.1021%2Facs.jpcc.0c05165}, volume = 124, year = 2020 }