Synthesis and Optical Properties of Boron Nitride Nanotubes, Nanowires and Nanorods
Dr Ying Chen
ARC Centre of Excellence in Functional Nanomaterials, Australian National University
Wednesday, 24 October 2007, 2.30pm, EW302, (via Level 3, EN Building), Hawthorn.
Quasi-one-dimensional boron nitride (BN) nanomaterials such as
nanotubes, nanowires, and nanorods have different nanostructures
but uniform electronic band gaps. Their quantum confinement effects
in these low-dimensional materials can enhance their optical emission
substantially by inducing an indirect-to-direct conversion of the optical
transition. Different nanostructures and dimensions have different
emission behaviors. Therefore, one-dimensional BN nanomaterials are
likely to find wide applications in optoelectronics. We have achieved
controlled and patterned growth of the BN nanotubes , BN nanowires
and conical boron nitride nanorods and investigated systematically their
optical properties using photoluminescence, cathodoluminescence and
Raman spectroscopy. BN nanotube is also a wide-band-gap semiconductor
and thus an ideal host material for rare-earth ions doping for visible light
emission. Europium (Eu) doped BN nanotubes have been synthesized by
using a ball-milling and annealing method. A broad visible light emission,
excited by electrons, from the Eu2+ doped BN nanotubes has been realized.
The mechanism of visible light emission from the Eu-doped BN nanotubes
will be discussed.
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