Graphene quantum dots are nanometre-sized graphene fragments that show photoluminescence. Carboxylated, aminated, hydroxylated and blue luminescent grades are listed for bio-imaging, sensing, photocatalysis and optoelectronics research. Request a quote for concentration and price in India. More options: Quantum Dots. Supplied across India by Aritech Chemazone, the authorised Indian distributor of Nanochemazone Canada.