Quantum Optoelectronics

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Non-equilibrium carrier dynamics and many body effects in highly excited GaN

PHYSICA STATUS SOLIDI A-APPLICATIONS AND MATERIALS SCIENCE 208:5 (2011) 1159-1165

Authors:

Kwangseuk Kyhm, Lucio Rota, Robert A Taylor
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Optical Studies on InxGa1-xN quantum disks

ULTRAFAST PHENOMENA IN SEMICONDUCTORS AND NANOSTRUCTURE MATERIALS XV 7937 (2011) ARTN 793713

Authors:

Mark J Holmes, Young S Park, Xu Wang, Christopher CS Chan, Anas F Jarjour, Jun Luo, Jamie H Warner, HAR El-Ella, RA Oliver, Robert A Taylor
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Optical studies on a single GaN nanocolumn containing a single InxGa1-xN quantum disk

APPLIED PHYSICS LETTERS 98:25 (2011) ARTN 251908

Authors:

Mark J Holmes, Young S Park, Xu Wang, Christopher CS Chan, Benjamin PL Reid, HeeDae Kim, Robert A Taylor, Jamie H Warner, Jun Luo
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Strongly coupled single quantum dot in a photonic crystal waveguide cavity

AIP Conference Proceedings AIP (2011) 1017-1018

Authors:

FSF Brossard, XL Xu, DA Williams, M Hadjipanayi, M Hugues, M Hopkinson, X Wang, RA Taylor, Jisoon Ihm, Hyeonsik Cheong
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High up-conversion efficiency of YVO4:Yb,Er nanoparticles in water down to the single-particle level

Journal of Physical Chemistry C 114:51 (2010) 22449-22454

Authors:

G Mialon, S Türkcan, G Dantelle, DP Collins, M Hadjipanayi, RA Taylor, T Gacoin, A Alexandrou, JP Boilot

Abstract:

We report up-conversion emission from an aqueous solution of YVO 4:Yb3+,Er3+ nanocrystals synthesized by an original method that produces nanoparticles with excellent crystallinity and no porosity. We show that these YVO4:Yb3+,Er3+ nanocrystals are not very sensitive to nonradiative relaxations, leading to a high green-to-red emission ratio of 6.3. Using a comparison with YVO 4:Eu3+ particles, we determined the quantum yield of the up-conversion emission of the aqueous YVO4:Yb3+,Er 3+ dispersion to be 0.09 ± 0.04% for an excitation intensity of only 0.55 kW•cm-2 at 970 nm. Furthermore, single YVO 4:Yb,Er particles with an estimated size down to 10 nm can be detected using a wide-field microscope under a 970 nm, 8 kW•cm-2 excitation. Because of their unexpectedly high up-conversion emission without intermittency, their water dispersibility, and their photostability, YVO 4:Yb3+,Er3+ nanoparticles are highly appropriate both for single-biomolecule and for in vivo imaging. © 2010 American Chemical Society.
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