Two new C3 symmetrical star-shaped truxene-based discotic liquid crystals have been designed to study their optoelectronic properties. Both the truxene derivatives exhibited columnar hexagonal self-assembly, confirmed by a thorough analysis using POM, DSC, and XRD. A multilayered OLED device was structured using these mesogens as blue emitters for electroluminescent studies. The best-performing configuration was perceived for devices based on emitter 1b at a dopant concentration of 1 wt% in a well-aligned CBP host, giving a maximum EQE of 2.9%.

During the past few decades metal nanoparticles are in the forefront of research for their unique properties and wide range of versatile applications. Among the several transitional metal nanoparticles palladium nanoparticles (PdNPs) are most interesting for their superior catalytic activity towards several organic reactions and also used as recyclable catalyst. Now being the time when environmental issue is a great concern and needs development of environmentally benign process. Synthesis of PdNPs using non-toxic chemicals and solvents, mild reaction condition, bio-degradable reducing or stabilizing agent, alternative energy sources are energy efficient and also cost effective and considered as green process Functionalization on the surface of PdNPs, nanoparticles showed excellent catalytic activity and can perform organic reactions in eco-friendly conditions. In this review different green synthetic methods, surface functionalization and catalytic activity of PdNPs towards several C-C coupling reactions, toxic dye degradations are discussed.

Carbon Quantum Dots (CQDs) are versatile nanocarbon materials with high crystallinity, stable photoluminescence, and small in size. Researchers find suitable applications in photocatalysis and electrocatalysis due to their superconductivity, tunable photoluminescence, and quick charge transfer. This review highlights synthetic techniques of CQDs, and characteristics, and showcases ample applications in both photocatalysis and electrocatalysis.