The optical spectroscopic properties of rare earth-activated barium orthophosphate in VUV-Vis range
2003; Elsevier BV; Volume: 38; Issue: 5 Linguagem: Inglês
10.1016/s0025-5408(03)00059-x
ISSN1873-4227
AutoresH. Liang, Ye Tao, Qinghua Zeng, Hong He, Shubin Wang, Xueying Hou, Wei Wang, Qiang Su,
Tópico(s)Crystal Structures and Properties
ResumoThe optical properties of rare earth ions-activated barium orthophosphate phosphors, Ba3(PO4)2:RE (RE=Ce3+, Sm3+, Eu3+, Eu2+, and Tb3+), were investigated in vacuum ultraviolet (VUV)-Vis range. A band–band transition of PO43− in Ba3(PO4)2 is observed in the region of 150–170 nm. The partial reduction of Eu3+ to Eu2+ was observed and confirmed by luminescent spectra under the VUV–UV excitation. It is proposed that the electronegative defects that formed by aliovalent substitution of Eu3+ on the Ba2+ site in the host are responsible for the reduction process.
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