Effect of Oxygen Vacancy on the Optical Properties of Porous Zirconia

Abstract

The effect of oxygen vacancy on the optical properties of porous zirconia (ZrO2) was discussed based on the preparation and optical characterization of this material. The configuration coordinate diagram for a discussion of the optical performances of the ZrO2 system was carefully amended. The samples used in the experiments were prepared by the hydrothermal method. The product possesses a porous structure constructed by amorphous zirconia particles and the specific surface area of the product was 151.9 m 2 •g-1. Deconvolution was used to analyze the photoluminescence (PL) spectra and the results are different in some aspects compared with previous reports. The main PL bands of the as-prepared product were located in the violet to blue region while those of the samples after treatment by H3PO4 red-shifted to the blue-green region. Neither the porous structure nor the existence of phosphor reagents in ZrO2 induced any new PL peaks. The oxygen vacancies in the samples formed a new energy level that trapped electrons to form a color center and then luminescent emissions were induced.

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