| 초록 |
Optical biosensors have some advantages such as relatively high detection sensitivity and low cost. However, current optical biosensors dependent on visible light or ultraviolet as the exciting light source can cause damages to biological systems. Upconversion nanoparticles (UCNPs), which can convert low-energy excitation to high-energy emission, have been intensively investigated due to their advantageous optical properties including large anti-Stokes shifts, narrow emission bandwidths for easily multiplex imaging, improved signal-to-noise ratio. Herein, core-shell structured UCNPs with different emission colors were synthesized by controlling feed composition. Their physicochemical and photoluminescence properties were investigated. The surface modification of UCNPs for near-infrared (NIR)-initiated biosensor was also conducted. |
