Fig. 1: Optical properties of polymer precursors.

a The UV-Vis and PL spectra of TCz and TCzP in DCM. Inset: the photo shows the fluorescence of TCzP (left) and TCz (right) in DCM solution excited by a wavelength of 365 nm. b The solvatochromic effects of TCz and TCzP in the increasing polarity solvent (HEX, ETE, DCM and ACN). c Solvatochromic Lippert-Mataga models of TCz and TCzP. d Transient PL spectra of TCz and TCzP in isopropyl ether.