Diaryl selenide is the main drug candidate today. An efficient, easy and ligand free cross-coupling reaction of aryl halide and diaryl diselenide was carried out by as-prepared copper sulfide functionalized carbon (Cu2S@C) catalyst. Cu2S@C catalyst was developed using novel tri-cationic ionic liquid (IL) as a precursor and sulfur source. Catalyst found to having rich content of heteroatoms (S and N) by EDX and Elemental mapping characterization techniques. Effective utilization of catalyst was carried out by synthesis of variety of aryl selenide in excellent yield from readily halides and diaryl diselenides. Active centers in the catalyst provide efficient activation for crosscoupling reaction. Moreover, catalyst where easily reusable for three times without any obvious loss in catalytic activity.