Photoluminescence of lanthanide-doped CaSi2O2N2 phosphors and the energy-level diagram of lanthanide ions in CaSi2O2N2

Publication year: 2011
Source: Optical Materials, In Press, Corrected Proof, Available online 14 June 2011

LiXun, Yang , Xin, Xu , LuYuan, Hao , XiuFang, Yang , JiaYe, Tang , …

Lanthanide-doped CaSi2O2N2 phosphors were synthesized by solid-state reaction. Their photoluminescence (PL) properties were investigated and analyzed systematically. Energy transitions attributed to electron transfers from 4f to 4f (ff), from 4f to 5d (fd), from 5d to 4f (df) and charge transfer (CT) transition were obtained and classified. Finally, an energy-level diagram of lanthanide-ions in CaSi2O2N2 was proposed. The diagram matches perfectly with the experimental results and explains the luminescence properties of lanthanide-doped CaSi2O2N2 phosphors. The electron-vibrational interaction in 4f–5d optical transitions of CaSi2O2N2:Eu2+ was also studied.

 Highlights: ► The PL properties of lanthanide-doped CaSi2O2N2 phosphors were systematically studied. ► CaSi2O2N2:Yb2+(Sm3+) can absorb light from UV to blue and may be used in LED light source. ► An energy-level diagram of lanthanide-ion in CaSi2O2N2 was proposed.