Correlation Between the Optical and the Structural Properties in SrZrO3 Nanocrystals

초록

We used optical and photoluminescence spectroscopic techniques to investigate the optical and the structural properties of SrZrO_3nanocrystals (NCs) synthesized by using the combustion method. As-synthesized SrZrO_3 NCs were post-annealed at various annealing temperatures and under various ambient conditions. The absorption spectra of SrZrO_3 NCs are composed of a fundamental bandgap feature and an in-gap state just below it. With increasing annealing temperature, the bandgap of the NCs becomes larger, and the in-gap state absorption becomes weaker. At the same time, the violet-blue emission, which is clearly identified even at room temperature, is dramatically suppressed. These optical characteristics are in accord with the development of the peaks shown in the X-ray diffraction pattern with increasing annealing temperature. We also examined the possible contribution of the SrCO_3 impurity phase to the optical properties of the SrZrO_3 NCs.

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