High-Brightness, Hundred-Second Level Ultralong Afterglow Polymers Built via Ultrasound-Synchronized B-O-Click Strategy

In recent years, there has been a growing interest in pure organic materials with ultralong room temperature phosphorescence (RTP) and afterglow duration time (t(ag)) in the range of second level. However, it is extremely difficult to achieve t(ag) >60 s in the polymer fields. Herein, this work proposes a highly versatile ultrasound-synchronized B-O-Click strategy that can firmly immobilize various types of polycyclic aromatic boronic acids (PABAs) as single-molecular states in a tight and rigid matrix of poly(vinyl alcohol) (PVA), achieving a series of record-breaking ultralong afterglow polymeric RTP materials. Based on this approach, a polymeric material is reported exhibiting a record-breaking t(ag) = 130 s, accompanied with an ultralong lifetime of 7.24 s and a good phosphorescence efficiency of 14.26%. Three other polymeric materials with t(ag) over 60 s are also realized via the same strategy by changing the phosphor. In addition, record-breaking ultralong green (t(ag) = 115 s) and red (t(ag) = 80 s) afterglow are further achieved based on the phosphorescence resonance energy transfer (PRET) effect.