Lee Seungmin, Lim Junhwi, Lee Y S
Department of Physics, Soongsil University, Seoul, South Korea.
Luminescence. 2018 Nov;33(7):1257-1261. doi: 10.1002/bio.3543. Epub 2018 Aug 29.
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.
我们研究了不同铈离子（Ce）浓度的钙钛矿CaHfO多晶体的发射特性。在宽范围的紫外光激发下，我们观察到在430nm附近有强烈发射，这应该源于Ce离子中的5d-4f跃迁。将这些发射光谱与光致发光激发光谱相结合，我们估计斯托克斯位移为6700cm，与Ce离子掺杂浓度无关。我们发现Ce离子中的紫蓝色发射在其峰值位置和强度上表现出不平凡的温度依赖性。我们发现了紫蓝色发射有趣的低温行为，这可能归因于CaHfO中的热晶格效应。我们还将我们的结果与类似材料钙钛矿锆酸盐的结果进行了讨论。我们的系统研究为未来关于Ce离子紫蓝色发射的研究提供了关于主体材料CaHfO的有用信息。
