Intermolecular Hydrogen Bonds Induce Highly Emissive Excimers: Enhancement of Solid-State Luminescence

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• 作者：Yang Liu ; Xutang Tao ; Fuzhi Wang ; Jinghua Shi ; Jianliang Sun ; Wentao Yu ; Yan Ren ; Dechun Zou ; Minhua Jiang
• 刊名：Journal of Physical Chemistry C
• 出版年：2007
• 出版时间：May 3, 2007
• 年：2007
• 卷：111
• 期：17
• 页码：6544 - 6549
• 全文大小：309K
• 年卷期：v.111,no.17(May 3, 2007)
• ISSN：1932-7455

文摘

Aggregation induced emission (AIE) is an amazing property for light emitting materials and has attractedmuch attention. Here, we report a new kind of AIE materials: fluorenone derivates 2,7-dip-tolyl-fluorenone(DTFO) and 2,7-bis(4-(tert-butylthio)phenyl)-fluorenone (DSFO). Strong light emissions with a large Stokesshift and long lifetime in the solid state originate from the formation of excimers. The crystal structure ofDSFO shows that every two molecules are bound together even in the ground state by intermolecular hydrogenbonds and form a particular dimer. When this dimer is excited, it turns into an excimer without arrangementadjustment and likewise without repulsive interactions when the excimer decays back to the dimer; so, thenonradiative decay pathways that exist in common excimers are greatly reduced and thus induce a stronglyenhanced luminescence in the solid state. OLED devices employing DTFO as light emitting layers are fabricatedand evaluated.