Abstract
A novel phenomenon called the photoelastic effect had been observed in ZnO nanorods, alongwith a number of intriguing anomalies. With increasing excitation power, it was found that theA1 (LO) phonon exhibited a red-shift in frequency, on top of a blue-shift in thephotoluminescence (PL) peak energy. In addition, the temperature-dependentphotoluminescence spectra behaved quite differently under high and low excitation power.All our results can be accounted for by the photoelastic effect, in which the built-insurface electric field was screened by photoexcited electrons and holes. Throughthe converse piezoelectric effect, the internal strain was therefore altered. Ourresults make possible a new thrust for manipulating the physical properties of ZnOnanorods, and should prove very useful in the application of optoelectric devices.
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