Abstract
ZnO is a promising material for room-temperature ultraviolet (UV) light-emitting devices due to its wide band gap (3.37 eV) and large exciton binding energy (60 meV). Recently, several groups have reported room-temperature UV lasing from ZnO nanocrystallites.1-3 To evaluate the optical properties and crystallinity of ZnO nanocrystallites, the optical properties must be measured with nanometer-scale resolution. Using a UV optical near-field technique, we observed size-dependent features of individual ZnO nanocrystallites.
© 2002 Optical Society of America
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