Abstract
The pressure dependence of the photoluminescence (PL) transition associated with the fundamental bandgap of ZnO nanowires has been studied at pressures up to 15 GPa. The near-bandedge luminescence emission is found to shift toward higher energy with applied pressure at a rate of 29.2 meV/GPa with a small second-order term of −0.38meV∕GPa2. An effective hydrostatic deformation potential −3.92±0.15eV for the direct bandgap of the ZnO nanowires is derived from the results. The broad green emission band in ZnO depends on pressure with a linear slope of 15.9 meV/GPa and a quadratic coefficient of −0.71meV∕GPa2. The results indicate that the initial states involved in the emission process are deep localized states.
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