Defects Cause Subgap Luminescence from a Crystalline Tetracene Derivative. McAnally, R. E., Bender, J. A., Estergreen, L., Haiges, R., Bradforth, S. E., Dawlaty, J. M., Roberts, S. T., & Rury, A. S. The Journal of Physical Chemistry Letters, 8(24):5993–6001, American Chemical Society (ACS), 2017. 
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Paper doi abstract bibtex We use steady-state and ultrafast nonlinear spectroscopies in combination with density functional theory calculations to explain light emission below the optical gap energy (Eo) of crystalline samples of 5,12-diphenyl tetracene (DPT). In particular, the properties of vibrational coherences imprinted on a probe pulse transmitted through a DPT single crystal indicate discrete electronic transitions below Eo of this organic semiconductor. Analysis of coherence spectra leads us to propose structural defect states give rise to these discrete transitions and subgap light emission. We use the polarization dependence of vibrational coherence spectra to tentatively assign these defects in our DPT samples. Our results provide fundamental insights into the properties of midgap states in organic materials important for their application in next-generation photonics and optoelectronics technologies.
@article{McAnally_2017,
doi = {10.1021/acs.jpclett.7b02718},
url = {https://doi.org/10.1021%2Facs.jpclett.7b02718},
year = 2017,
publisher = {American Chemical Society ({ACS})},
volume = {8},
number = {24},
pages = {5993--6001},
author = {R. Eric McAnally and Jon A. Bender and Laura Estergreen and Ralf Haiges and Stephen E. Bradforth and Jahan M. Dawlaty and Sean T. Roberts and Aaron S. Rury},
title = {Defects Cause Subgap Luminescence from a Crystalline Tetracene Derivative},
journal = {The Journal of Physical Chemistry Letters},
abstract = {We use steady-state and ultrafast nonlinear spectroscopies in combination with density functional theory calculations to explain light emission below the optical gap energy (Eo) of crystalline samples of 5,12-diphenyl tetracene (DPT). In particular, the properties of vibrational coherences imprinted on a probe pulse transmitted through a DPT single crystal indicate discrete electronic transitions below Eo of this organic semiconductor. Analysis of coherence spectra leads us to propose structural defect states give rise to these discrete transitions and subgap light emission. We use the polarization dependence of vibrational coherence spectra to tentatively assign these defects in our DPT samples. Our results provide fundamental insights into the properties of midgap states in organic materials important for their application in next-generation photonics and optoelectronics technologies.},
bibbase_note = {<img src="https://pubs.acs.org/cms/10.1021/acs.jpclett.7b02718/asset/images/medium/jz-2017-02718m_0007.gif">}
}
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