Dual-Emissive Waterborne Polyurethanes Prepared from Naphthalimide Derivative

Abstract

Fluorescent and room-temperature phosphorescent (RTP) materials are widely used in bioimaging, chemical sensing, optoelectronics and encryption. Here, a series of single-component dual-emissive waterborne polyurethanes (WPUs) with both fluorescence and room-temperature phosphorescence were synthesized. Dye without halogen atom incorporated into WPUs can only exhibit fluorescence due to poor spin-orbit coupling. When bromine atom is introduced into dye, we found that WPUs can emit both fluorescence and room-temperature phosphorescence with lifetimes up to milliseconds because of enhanced spin-orbit coupling. Moreover, with an increase in dye concentrations in WPUs, excimers are formed due to the aggregation effect, and may promote communication between singlet and triplet states. At different dye concentrations, structural, thermal, and luminescent properties serve as the main focus.

Advances in Polymer‐Based Organic Room‐Temperature Phosphorescence Materials

“…A similar phenomenon was further documented from polymer 14 (Scheme 2). [ 51 ] A new structured band similar to that in vacuo was observed when chromophore concentration increased, which was confirmed to belong to phosphorescence. Later, Zhang and co‐workers [ 52 ] found that RTP could be “switched on” when a new CT state was generated via external stimuli.…”

Scorpion-inspired fluorescent polymers

“…Introducing fluorescent dyes into polymer networks is a common protocol for the preparation of photoluminescence (PL) materials. 24,25 MDE is a natural fluorescent dye that was chemically modified into DVMDE, and it exhibits significant blue fluorescence emission under UV light at 365 nm. As expected, the prepared PMAD-x films also possessed fluorescence emission properties.…”