Abstract:
Using synchrotron radiation, a comparative VUV excitation study of YAG ceramics doped
with Eu3+ and Cr3+ ions under VUV excitation (10.5–3.7 eV) at 9 K was conducted in this work.
Both ceramics exhibit distinct excitation peaks in the VUV region, indicating high-energy transitions
related to the internal electronic levels of the dopants and interband transitions within the YAG matrix.
For YAG:Eu, the main excitation peaks at 6–7 eV correspond to transitions within the 4f-shell of Eu3+
and Eu3+-O2− charge transfer states, showing weak dependence on the crystal field and high energy
conversion efficiency. In contrast, YAG:Cr shows broad excitation bands due to transitions between
levels influenced by strong crystal field interactions, resulting in lower luminescence efficiency. The
study highlights the importance of crystal structure and dopant interactions in determining the
spectral characteristics of YAG-based ceramics, offering potential for their application in advanced
optoelectronic devices.
