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Article << Previous     |     Next >>   Contents Vol 63(1)

Optical and Electronic Properties of Doubly Ortho-linked cis-4,4′-Bis(diarylamino)stilbene/Fluorene Hybrids

Yan-Ling Liu A B, Xue-Qin Ran A, Ji-Kang Feng A C, Ai-Min Ren A, Lu-Yi Zou A

A State Key Laboratory of Theoretical and Computational Chemistry, Institute of Theoretical Chemistry, Jilin University, Changchun 130023, China.
B College of Chemistry and Chemical Engineering, Hainan Normal University, Haikou 571158, China.
C Corresponding author. Email: JiKangf@yahoo.com
 
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Abstract

Doubly ortho-linked cis-4,4′-bis(diarylamino)stilbene/fluorene hybrids have potential application in organic light emitting diodes. These organic molecules can function as efficient hole transport materials, with sky-blue emission and high efficiency and stability. To reveal the relationship between the properties and structures of these functional materials, we apply quantum-chemical techniques to investigate their optical properties and electronic structures. It is found that 8- and 8′-substituents give an antibonding contribution to the highest occupied molecular orbitals (HOMO), thus increasing the HOMO energy, implying an enhancement of hole-creating ability. Changes in ionization potentials confirm this presumption. The absorption and emission spectra exhibit red shifts to some extent with the various 8- and 8′-substituents, which are in good agreement with the experimental values. The Stoke shifts range moderately from 40 to 86 nm, due to the rigid spiral structure that hinders geometrical relaxation.



   
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