Metal-free organic luminophores with ultrastrong dipole moment exhibiting force-induced near-infrared emission (>800 nm) turn-on

Abstract

Two metal-free organic luminophores with ultrastrong dipole moments of 16.1 (CPBT) and 22.7 (CTBT) Debye were developed for constructing near-infrared mechanoresponsive luminescent materials. Amorphous CTBT showed a remarkable emission turn-on peak at 822 nm due to disturbance in the dipole–dipole interactions in the solid state upon mechanical grinding.