A triphenylamine-based benzoxazole derivative as a high-contrast piezofluorochromic material induced by protonation

A triphenylamine-based benzoxazole derivative ( BVDP ) as a typical D–π–A molecule could be used as a low contrast piezofluorochromic material with a spectral red-shift of 29 nm. However, when BVDP bound a proton to form BVDP+H , a high contrast piezofluorochromism (Δ λ = 75 nm) could be observed.