Upconverting nanoparticles absorb near-infrared light and emit visible light, which makes them useful for bio-imaging, security inks, sensing and photonics research. Oil dispersible, water dispersible and PEG modified grades are listed. Request a quote for emission colour, concentration and price in India. See also Quantum Dots. Supplied across India by Aritech Chemazone, the authorised Indian distributor of Nanochemazone Canada.