Confining Carboxylized Carbon Nanotube for Phosphorescence Afterglow with Optical Memory Plasticity

Abstract

Afterglow materials are of primary interest in optoelectronics and bioelectronics. Here, a long‐lived phosphorescence afterglow is reported from carboxylated carbon nanotubes (c‐CNTs) confined within boron oxynitride (BNO). The formation of covalent and hydrogen bonds in c‐CNT@BNO enhances the rigidity of the hybrid structure and alleviates the non‐radiative deactivation of excited triplet states, leading to room‐temperature phosphorescence (RTP). The afterglow material exhibits an ultra‐long RTP lifetime of up to 476.6 ms, with an afterglow time of 4.0 s, distinguishable by naked eyes. This unprecedented feature makes c‐CNT act like a light‐sensitive neuron and it is possible to achieve memorizing−forgetting behavior in the form of optical memory plasticity, owing to photons’ capture‐and‐slow‐release process. In analogy to the biological brain, both memory strength and forgetting time are proportional to learning exercise, including the intensity and time of irradiation training. The study provides an effective protocol for the synthesis of afterglow nanomaterials, extending their application to brain‐like intelligent technology.

Modulating Emission of Organic Emitters from Fluorescence to Red Afterglow through Boric Acid-Assisted Energy Transfer

“…The enhancement of delay PL intensity after forming BA@Lev could be explained by the confinement effect of the BA matrix to Lev. The incorporation of Lev results in the restriction of its molecular movements, and it also prevents Lev from quenching by many environmental parameters, such as oxygens and solvents. , These effects reduce the probability of nonradiative relaxation and activate the radiative decay, resulting in the boosted emission intensity of Lev. With respect to the origin of the red-shift of peak maximum during processing Lev to BA@Lev, temperature-dependent delay PL spectra were recorded.…”

Facile Synthesis of B/P Co-Doping Multicolor Emissive Carbon Dots Derived from Phenylenediamine Isomers and Their Application in Anticounterfeiting

“…Recent studies have proposed heteroatom doping using elements such as N, S, B, and P to improve the fluorescence properties of CDs compared with those of the nondoped ones or those doped in different ways [16][17][18][19][20][21][22][23]. CDs doped with different heteroatoms will contribute to improving applications in the fields of encryption [24][25][26][27][28][29]. Therefore, we have found an original material for producing carbon dots, namely phenylenediamine.…”