journal article·2017-07-13

Conformational Effect of Polymorphic Terfluorene on Photophysics, Crystal Morphologies, and Lasing Behaviors

Chang-Jin Ou, Xue-Hua Ding, Yin-Xiang Li, Can Zhu, Meng-Na Yu, Ling-Hai Xie, Jin-Yi Lin, Chun-Xiang Xu, Wei Huang

The Journal of Physical Chemistry C· Volume 121· Issue 27
Publisher page

Abstract

Molecular conformation is an important factor in flexible organic molecules and deeply influences their physical and chemical properties. Here, a model fluorene trimer, 2,2′:7′,2″-ter(9,9-dimethylfluorene) (TDMeF), was designed and synthesized to investigate the effect of conformational diversity of oligofluorene on the morphologies of microcrystals and photophysical properties. Single crystal X-ray diffraction analysis indicates that TDMeF has four polymorphs with different molecular conformations, and crystalline polymorphism is first observed in oligofluorenes. Moreover, the slight change in molecular conformation leads to form different crystal morphologies, namely, ribbon and rodlike microcrystals, in virtue of different intermolecular interactions. Finally, although both microcrystals display deep blue lasing behaviors, the rodlike microcrystal shows a threshold of 114 W/cm 2, which is twice times lower than that of the ribbon-like one due to the effect of molecular orientation and optical microcavity.
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Research context

OpenAlex topics: Luminescence and Fluorescent Materials · Organic Electronics and Photovoltaics · GaN-based semiconductor devices and materials

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Flexible Electronics (KLOFE) & Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing Tech University, Nanjing 211816, China

Center for Molecular Systems and Organic Devices (CMSOD), Key Laboratory for Organic Electronics & Information Displays (KLOEID) and Institute of Advanced Materials (IAM), Jiangsu National Synergetic Innovation Center for Advanced Materials (SICAM), Nanjing University of Posts & Telecommunications, Nanjing 210046, China

State Key Laboratory of Bioelectronics, School of Electronic Science and Medical Engineering, Southeast University, Nanjing 210096, China

Funding

Ministry of Education of the People's Republic of China · China Postdoctoral Science Foundation · Natural Science Foundation of Jiangsu Province · National Natural Science Foundation of China · Education Committee of Jiangsu Province · Jiangsu Province · Six Peak Talents Foundation of Jiangsu Province · Synergetic Innovation Center for Organic Electronics and Information Displays, Nanjing University of Posts and Telecommunications · Jiangsu National Synergetic Innovation Center for Advanced Materials

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