Pivotal role of Boron-doped graphene quantum dots in stretchable and Self-Healable red emission nanocomposite Film: One step advance for white light emitting diodes application

In this study, red-emitting BGQDs were prepared by a hydrothermal method derived from 1,3,6-Trinitropyrene (TNP) and boric acid. The luminescence properties of as-synthesized BGQDs were characterized through photoluminescence (PL), time-resolved photoluminescence (TRPL), and UV–Vis measurements. After the modification of boron doping, B-GQDs demonstrated superior optical properties and chemical stability compared to pristine ones. For the sake of continued stability in the luminescent layer performance derived from BGQDs, poly{(n-butyl acrylate)–co-[N-(hydroxymethyl)acrylamide]} (PBA0.8-co-PNMA0.2) as an amphiphilic copolymer matrix with tunable mechanical, elastic, and self-healing properties was introduced. Through the synergistic effects between BGQDs and amphiphilic copolymer side chain, the physical and mechanical properties of the red-emitting nanocomposite film were impressively improved. Furthermore, white light-emitting diodes (WLEDs) were successfully fabricated by combining a 450 nm GaN chip, a commercial green-emitting (Ba,Sr)2SiO4:Eu2+ phosphor, and a self-healable red-emitting nanocomposite film, generating a high color rendering index (CRI) value of 89.4.