Stable lignin-based afterglow materials with ultralong phosphorescence lifetimes in solid-state and aqueous solution

Abstract

A strategy of preparing afterglow materials has been achieved by immobilizing carboxymethylated lignin-based carbon dots into silica, which provides a new path for the high-value utilization of lignin.

Two-Pronged Approach: Synergistic Tuning of the Surface and Carbon Core to Achieve Yellow Emission in Lignin-Based Carbon Dots

“…XPS technique was performed on the prepared lignin-based CDs to determine the state of their surface and carbon core. As depicted in Figure a, the XPS spectra of Y-CDs, B-CDs-1, B-CDs-2, B-CDs-3, and B-CDs-4 revealed two obvious peaks at 284.8 and 531.8 eV, corresponding to C 1s and O 1s, respectively . The atomic content of C and O in the Y-CDs was 68.58 and 27.92%, respectively.…”

“…As depicted in Figure 4a, the XPS spectra of Y-CDs, B-CDs-1, B-CDs-2, B-CDs-3, and B-CDs-4 revealed two obvious peaks at 284.8 and 531.8 eV, corresponding to C 1s and O 1s, respectively. 52 The atomic content of C and O in the Y-CDs was 68.58 and 27.92%, respectively. Compared with the other samples, Y-CDs and B-CDs-3 exhibited significantly higher oxygen content.…”

Red, yellow, green, and blue light-emitting highly crystallized graphene quantum dots derived from lignin: controllable syntheses and light-emitting diode applications

“…Due to their unique chemical and photoluminescence (PL) properties, graphene quantum dots (GQDs) have found wide application in encryption, 1 sensors, 2 recycled plastics, 3 and light-emitting diodes (LEDs). 4 The ability to emit multiple colours is essential for multi-channel imaging, 5 multi-site marking, 6 and wide gamut LEDs.…”

Carbon Dot-Based Room-Temperature Phosphorescent Materials for Information Encryption

“…It is generally believed that π−π stacking interactions in solid aggregate states of CDs may induce FL quenching. 1,47 However, CDs solid synthesized in our work not only exhibits FL but also RTP. We speculate that insoluble magnesium salts form a protective salt shell for CDs, which not only hinders π−π stacking interactions of CDs, facilitating the solid FL, but also inhibits the non-radiative transition process of the triplet-state exciton, which is conducive to the generation of phosphorescence.…”

“…Room-temperature phosphorescent (RTP) materials, as one of the afterglow materials, have the characteristics of large Stokes shift and long luminescence life. , They are highly regarded and have extensive applications in fields such as biological imaging, information anti-counterfeiting encryption, and optoelectronic sensing . According to research, most RTP materials are prepared from inorganic compound containing rare earth, organic compounds containing precious metals, or pure organic compounds .…”