Hydrolyzation-Triggered Ultralong Room-Temperature Phosphorescence in Biobased Nonconjugated Polymers

Abstract

Amorphous nonconjugated room-temperature phosphorescent (RTP) polymers have aroused ever-increasing attention. However, the variety of such polymers is still rare due to limited preparation strategies. Herein, we report a facile strategy to achieve ultralong RTP emission in biobased nonconjugated polymers through a hydrolyzation process. The investigated polymers are synthesized by free radical solution copolymerization using biomass methyl isoeugenol and maleic anhydride as monomers. Noticeably, the obtained polymers carry no conventional fluorescent units but can exhibit blue fluorescence. More interestingly, after hydrolysis in sodium hydroxide aqueous solution, the resulting hydrolyzed polymers emit both enhanced blue emission and persistent RTP (up to 400 ms) under air conditions, with reversible emission performance switched via the uptake and removal of water. Also worthy to be highlighted is that the emission can be remarkably regulated by the cations in carboxylate or the substituents on the benzene ring. The as-obtained polymers demonstrate potential applications in anticounterfeiting and information encryption.

Long-lived room temperature phosphorescence from amorphous non-traditional intrinsic clusteroluminescence polymers

“…4a), and a similar phenomenon was also observed by Deng's group. 52 Compared with PSMA-H, the phosphorescence of PSMA-Li is blue-shifted to 500 nm (Fig. 4c), influenced by ionic bonds and electrostatic interactions, and the phosphorescence lifetime reaches 39.88 ms (Fig.…”

Nonconventional Fluorescence-Based Circularly Polarized Luminescent Core/Shell Particles: Maleic Anhydride Copolymer as the Core and Chiral Helical Polyacetylene as the Shell

“…In our previous study, we have demonstrated that amorphous nonconjugated PMM powders prepared by radical solution polymerization could show unique blue-emitting nonconventional photoluminescence (PL) property due to the formation of emissive clusters by locked carbonyls in MAH units, following the clustering-triggered emission (CTE) mechanism. , Here, we excitingly found that the as-prepared PMM particles can also exhibit strong blue-color fluorescence emission at about 430 nm under ultraviolet excitation. More interestingly, compared with the amorphous polymer obtained by radical solution polymerization, higher PL emission intensity is observed in the PMM particles (Figure S5), together with an increase of PL quantum yield (PLQY) from 3.7% to 4.9%.…”

“…In our previous study, 40 we have demonstrated that amorphous nonconjugated PMM powders prepared by radical solution polymerization could show unique blue-emitting nonconventional photoluminescence (PL) property due to the formation of emissive clusters by locked carbonyls in MAH units, following the clustering-triggered emission (CTE) mechanism. 28,30 Here, we excitingly found that the as-prepared PMM particles can also exhibit strong blue-color fluorescence emission at about 430 nm under ultraviolet excitation.…”

A processable, scalable, and stable full-color ultralong afterglow system based on heteroatom-free hydrocarbon doped polymers

“…In general, the challenge to generate RTP for organic chromophores lies in the insufficient intersystem crossing (ISC) caused by weak spin-orbit coupling (SOC), ultrafast nonradiative decays, and oxygen quenching. A variety of strategies have been proposed to promote ISC processes by inclusion of heavyand/or hetero-atoms 20,27,28 and deuteration, 29,30 and to suppress nonradiative relaxations using crystal engineering, [31][32][33][34][35] host-guest doping, 2,7,36 crosslinking, 37 polymerization [38][39][40][41] and many other methods. As a result, a growing number of organic RTP materials with long-lived lifetimes (4100 ms) under ambient conditions have been reported in recent years.…”