A mechanical and thermal responsive luminescent liquid crystal forming a colourless film under room light

We report here a luminescent liquid crystal that changes the luminescent colour by mechanical and thermal stimuli. The liquid crystal is a 1,5-naphtharene derivative having dendritic moieties and amide groups. This material is colourless due to little absorption in the visible region. The mechanical and thermal stimuli induce a phase transition of this material from the cubic phase to the columnar phase. This exhibits luminescent colour change from light blue to blue.