Upconversion Nanocrystals Embedded Microstructure via Contact Flow Lithography

We describe a high-throughput synthesis of multi-colored emissive microstructure with rare-earth doped upconverting nanocrystals (UCNs) using a contact flow lithography. UCNs which were synthesized by the hydrothermal method offer a large anti-Stokes effect that absorbs near-infrared (NIR) light and emit visible range luminescence. It is important for many applications such as bioimaging, anti-counterfeit system and displays. However, it is limited to control emission color tuning by stoichiometric control of lanthanide dopants. Herein, we suggest a method of microstructure synthesis which has a variety of shapes and multiple luminescence color through applying contact flow lithography technique to luminescence property of UCNs. Our results have great advantages in many fields including an anti-counterfeiting technology and encoding system