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SUMMARY:Controlling Photon Upconversion in Lanthanide-doped Nanocrystals -
  Professor Xiaogang Liu\, National University of Singapore
DTSTART:20160226T143000Z
DTEND:20160226T153000Z
UID:TALK64751@talks.cam.ac.uk
CONTACT:Stuart Higgins
DESCRIPTION:Lanthanide-doped nanoparticles exhibit unique luminescent prop
 erties\, 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 emissio
 n. These attributes offer the opportunity to develop alternative luminesce
 nt labels to organic fluorophores and quantum dots. In recent years\, rese
 archers have taken advantage of spectral-conversion nanocrystals in many i
 mportant biological applications\, such as highly sensitive molecular dete
 ction and autofluorescence-free cell imaging. With significant progress ma
 de over the past several years\, we can now design and fabricate nanoparti
 cles that display tailorable optical properties. In particular\, we can ge
 nerate a wealth of color output under single-wavelength excitation by rati
 onal 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 emissio
 n spectra of the particles to cover almost the entire visible region\, a f
 eat barely accessible by conventional bulk phosphors. In this talk\, I wil
 l highlight recent advances in the broad utility of upconversion nanocryst
 als for multimodal imaging\, bio-detection\, display and photonics.
LOCATION:Kapitza Building Seminar Room\, Cavendish Laboratory\, Department
  of Physics
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