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

• DOI: 10.1021/jp070288f
• Publication Date: 2007-04-11T11:00:33Z
• Authors: Yang Liu; Xutang Tao; Fuzhi Wang; Jinghua Shi; Jianliang Sun; Wentao Yu; Yan Ren; Dechun Zou; Minhua Jiang
• Keywords: Excimer; Fluorenone

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