Violet-blue emission property of the cerium-ion doped CaHfO : Doping and temperature dependence.

We investigated the emission property of perovskite CaHfO polycrystals with various concentrations of cerium ion (Ce ). With a wide range of UV photoexcitation, we observed a strong emission near 430 nm which should originate from 5d-4f transitions in the Ce ions. Combining these emission spectra with the photoluminescence excitation spectra, we estimated the Stokes shift to be 6700 cm , irrespective of the Ce ion doping concentration. We found that the violet-blue emissions in Ce ions showed non-trivial temperature dependence in their peak position and intensity. We found interesting low-temperature behavior of the violet-blue emission, which might be attributed to the thermal lattice effect in CaHfO . We also discussed our results with those of the similar materials, perovskite zirconates. Our systematic studies provide useful information on the host material CaHfO for a future study on the violet-blue emission of Ce ions.