Violet-blue emission property of the cerium-ion doped CaHfO3: Doping and temperature dependence

We investigated the emission property of perovskite CaHfO3 polycrystals with various concentrations of cerium ion (Ce3+). With a wide range of UV photoexcitation, we observed a strong emission near 430nm which should originate from 5d-4f transitions in the Ce3+ ions. Combining these emission spectra with the photoluminescence excitation spectra, we estimated the Stokes shift to be 6700cm(-1), irrespective of the Ce3+ ion doping concentration. We found that the violet-blue emissions in Ce3+ 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 CaHfO3. We also discussed our results with those of the similar materials, perovskite zirconates. Our systematic studies provide useful information on the host material CaHfO3 for a future study on the violet-blue emission of Ce3+ ions.