Enabling Long‐Lived Polymeric Room Temperature Phosphorescence Material in Abominable Solvent

Abstract

Long-lived polymeric room temperature phosphorescence (RTP) materials have drawn more attention due to their convenient preparation process and equally efficient phosphorescence performance in recent years. As the polymer matrix is sensitive to air and humidity, some noncovalent interactions in the matrix are easily decomposed in water or air, which means that it is difficult for this material to be stored stably for a long time in the atmospheric environment or under harsh conditions. In this work, polymer powder mBPipQ contains aromatic and piperidine rings that are designed and synthesized successfully. Then the polymer is uniformly dispersed into epoxy resin matrix to form long-lived polymeric RTP material with efficient afterglow properties. The stiff backbone structure of mBPip and dense molecular arrangement of epoxy resin provide a rigid environment to stabilize triplet excitons, the RTP performance is greatly enhanced. The lifetime of mBPipQ in epoxy resin is 2 times higher than that of small molecule chromophore in that one. Interestingly, after soaking in strong acid or alkali solution for 10 days, the material can still emit stable and efficient longlived phosphorescence. It is thanks to the hard matrix after full curing, which can provide a protective layer to prevent external quenchers from interfering with phosphorescence emission. Utilizing the efficient phosphorescence emission and excellent abominable-solvent resistance of this RTP material, multilevel information encryption has been successfully demonstrated. This work broadens the application scope of polymeric RTP materials in harsh environments and provides a new idea for achieving efficient RTP emission.

Recent Advances of Pure Organic Room Temperature Phosphorescence Based on Functional Polymers

“…The melt casting method, 14 often come after a solution casting, involves heating the mixed polymer and dopant into a flowing liquid and then cooling it down. The in situ polymerization method 15 is to add nonreactive luminophores during the polymer synthesis process. Poly(vinyl alcohol) (PVA) was known to be a rigid matrix to form amorphous RTP systems by doping luminophores in it.…”