The modularity and straightforward synthesis of the hydrazone-based systems allowed us to develop two different families of fluorophores starting from the same materials. The first family consists of BF2-hydrazone complexes (BODIHY) that exhibit aggregation induced emission. The BODIHY dyes are unique because they are efficient solid-state light emitters, in spite of their planar structures and π-π interactions. We are currently conducting structure-property analyses to uncover the mechanism by which these compounds emit in the solid-state, and ways to control their photophysical properties.
The second family of light emitters is obtained by the Cu(II)-mediated oxidative coupling of the hydrazones into triazolopyridinium (TOP) salts. These salts emit blue light, have large Stokes shifts and broad emission bandwidths. The main focus with this family will be the control of these photophysical properties so the dyes can be used as blue and white fluorophores in advanced energy applications, such as light-emitting electrochemical cells and White OLEDs.