Aggregation induced emission enhancement (AIEE) of fluorenyl appended Schiff base : A turn on fluorescent probe for Al3þ, and its photovoltaic effect

Abstract

Fluorenyl-diformyl phenol Schiff (HL) base is spectroscopically characterized and demonstrates aggre gation induced emission enhancement (AIEE) upon addition of water to THF solution. Maximum intensity is observed at 90% of water addition at 570 nm. Al3þ induced turn-on fluorescence enhance ment is observed at 600 nm and the limit of optical detection (LOD) is 6.22x10 9 M. Isolation of Al(III) complex and mass spectral measurement shows the formation of phenoxo-bridged dinuclear complex. Applicability for DSSC device fabrication of probe shows photovoltaic efficiency 0.021%. DFTcomputation of optimized geometry of HL has been used to explain the spectral and photovoltaic activity.