Speaker
Prof.
Xiaogang Liu
(Department of Chemistry, National University of Singapore, Singapore 117543 and Institute of Materials Research and Engineering, A*STAR, Singapore 117602)
Description
Lanthanide-doped nanoparticles exhibit unique luminescent properties, including a
large Stokes shift, a sharp bandwidth of emission, high resistance to optical blinking, and
photobleaching. Uniquely, they can also convert long-wavelength stimulation into short-
wavelength emission. These attributes offer the opportunity to develop alternative
luminescent labels to organic fluorophores and quantum dots. In recent years, researchers
have taken advantage of spectral-conversion nanocrystals in many important biological
applications, such as highly sensitive molecular detection and autofluorescence-free cell
imaging. With significant progress made over the past several years, we can now design and
fabricate nanoparticles that display tailorable optical properties. In particular, we can generate
a wealth of color output under single-wavelength excitation by rational control of different
combinations of dopants and dopant concentration. By incorporating a set of lanthanide ions
at defined concentrations into different layers of a core-shell structure, we have expanded the
emission spectra of the particles to cover almost the entire visible region, a feat barely
accessible by conventional bulk phosphors. In this talk, I will highlight recent advances in the
broad utility of upconversion nanocrystals for multimodal imaging, bio-detection, display and
photonics.
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Primary author
Prof.
Xiaogang Liu
(Department of Chemistry, National University of Singapore, Singapore 117543 and Institute of Materials Research and Engineering, A*STAR, Singapore 117602)