Theoretical Analysis on the Optoelectronic Properties of Single Crystals of Thiophene-furan-phenylene Co-Oligomers: Efficient Photoluminescence due to Molecular Bending

详细信息    查看全文

• 作者：Hiroyuki Tamura ; Ikutaro Hamada ; Hui Shang ; Kazuaki Oniwa ; Md. Akhtaruzzaman ; Tienan Jin ; Naoki Asao ; Yoshinori Yamamoto ; Thangavel Kanagasekaran ; Hidekazu Shimotani ; Susumu Ikeda ; Katsumi Tanigaki
• 刊名：The Journal of Physical Chemistry C
• 出版年：2013
• 出版时间：April 25, 2013
• 年：2013
• 卷：117
• 期：16
• 页码：8072-8078
• 全文大小：422K
• 年卷期：v.117,no.16(April 25, 2013)
• ISSN：1932-7455

文摘

We theoretically analyze the optoelectronic properties of single crystals of 2,5-bis(4-biphenylyl) bithiophene (BP2T) and 2-(4-biphenyl)-5-[5-(4-biphenyl)-2-thienyl] furan (BPFT) molecules, aiming to provide a guiding principle for the material design of organic light-emitting transistors. The X-ray structure analysis and the density functional theory (DFT) calculations indicate that half of the BPFT molecules bend the 蟺-conjugation plane in the crystal. The Marcus theory parametrized by the DFT calculations indicates anisotropic charge mobilities. The emission spectra of the BP2T and BPFT crystals are analyzed by the time-dependent DFT calculations in conjunction with the Frenkel exciton model and the vibronic coupling analysis. We revealed that the high photoluminescence efficiency of the BPFT crystal originates from the symmetry breaking of the H-aggregate, where the transition dipole of the dark state does not cancel out.