Fig. 2. Photophysical properties of five polymer films under the stimuli of water and heat.
(A) Chemical structures of five arylboronic acids. (B) The steady-state photoluminescence spectra and phosphorescence spectra upon water fumigation or heating of m-Bp-BOH-PVA (λex = 254 nm), p-Bp-BOH-PVA (λex = 254 nm), Nap-BOH-PVA (λex = 312 nm), BNap-BOH-PVA (λex = 312 nm), and Py-BOH-PVA (λex = 365 nm) films. Inset: Phosphoresce lifetimes and phosphoresce quantum yields of five polymer films after heating at 85°C for 10 min and dropping to room temperature. a.u., arbitrary units. (C) Photographs of the reversible heating/water fumigation processes for five polymer films.