Finlayson, C.E., Amezcua, A., Sazio, P.J.A., Walker, P.S., Grossel, M.C., Curry, R.J., Smith, D.C. and Baumberg, J.J.
Infrared emitting PbSe nanocrystals for telecommunications window applications
Journal of Modern Optics, 52, (7), . (doi:10.1080/09500340512331327589).
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We demonstrate the colloidal synthesis of PbSe nanocrystal quantum dots, via an organometallic-precursor route, developed from recently reported techniques. This synthesis typically yields a particle size distribution of approximately 5-10%, as may be inferred from the sharp spectral features seen in absorption and from our effective-mass model correlating spectral features to nanocrystal size. An accurate quantitative analysis, using an infrared reference dye, shows these nanocrystals to exhibit infrared photoluminescence from intrinsic quantum-confined states, with high quantum efficiencies of up to 60% in solution. The wavelength of the photoluminescence may also be conveniently size tuned in order to access the 1.3-1.5 µm 'telecommunications window'. We discuss the significance of this work in the context of future optoelectronic applications.
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