Showing papers by "Wang Zhang Yuan published in 2023"
TL;DR: In this paper , the co-crystallization between melamine and cyclic imide-based non-conventional luminophores is reported, which affords cocrystals owning multiple hydrogen bonds and effective clustering of electron-rich units.
Abstract: Pure organic persistent room-temperature phosphorescence (p-RTP) is in urgent demand for advanced optoelectronic and bioelectronic applications. However, it remains an enormous challenge to modulate the emission colors while simultaneously boosting the phosphorescence lifetimes and efficiencies. Herein, we report the co-crystallization between melamine and cyclic imide-based non-conventional luminophores, which affords co-crystals owning multiple hydrogen bonds and effective clustering of electron-rich units, thus resulting in diverse emissive species with highly rigidified conformations and promoted spin-orbit coupling. Consequently, p-RTP co-crystals with simultaneously enhanced efficiencies and lifetimes of up to 12.0% and 898 ms, alongside remarkably improved color tunability, are obtained. These results may spur the future rational design of high-performance p-RTP materials and advance the mechanism of understanding of the origin of color-tunable phosphorescence.
TL;DR: In this paper , the authors focused on one of the most common boron-containing substances in organic syntheses, namely bis(pinacolato)diboron (BE1) and bis(2,4-dimethylpentane-2-4-glycolato) diborons (BE2), where empty p-orbital and p-orbitals of oxygen with lone pairs form π frameworks.
Abstract: While the majority of consist of electron-rich heteroatoms, an emerging category with nonconventional luminophores electron-deficient atoms (e.g. boron) have gained much attention. In this work, we focused on one of the most common boron-containing substances in organic syntheses, namely bis(pinacolato)diboron (BE1) and bis(2,4-dimethylpentane-2,4-glycolato)diboron (BE2), where empty p-orbital of boron and p-orbitals of oxygen with lone pairs form π frameworks. Both compounds are nonemissive in dilute solutions but depict remarkable photoluminescence (PL) at aggregate states, featuring aggregation-induced emission characteristics. Additionally, their PL can be easily tuned by various external factors, such as excitation wavelength, compression, and oxygen, while their photophysical properties are well-explained by the clustering-triggered emission (CTE) mechanism.