Scheme 1
The chemical structures of (a) ODPF-Phpy, (b) ODPF-(Phpy)2 and (c) BCF. d The excited state behavior in coordination blending films. In blending films, the intermolecular FRET occurred from the original compound to the coordinated compound. For the coordinated compound, the intramolecular charge transfer leads to the exciton energy decreased with film polarity increasing. Insets also present the photographic images of initial spin-coated film and blending films under UV lamp. Emission colors can be easily tuned from deep-blue, to green and orange, also confirmed narrow band-gap and multi-emission species after supramolecular N-B coordination
