Energy transfer in LaMgB5O10:Pr3+,Mn2+ under VUV excitation

Abstract

Luminescent properties of Pr3+ or Mn2+ singly doped and Pr3+, Mn2+ co-doped LaMgB5O10 are investigated by synchrotron radiation VUV light. When LaMgB5O10:Pr3+ is excited at185 nm, the photon cascade emission between 4f levels of Pr3+ is observed. In the excitation spectra of LaMgB5O10:Mn2+ monitoring the 615 nm emission of Mn2+, several excitation bands in a spectral range from 330 to 580 nm are recorded, among which the most intense band is centered at 412 nm (6A1g→4Eg–4A1g). This band has considerable spectra overlap with the 410 nm emission (1S0→1I6) of Pr3+, which is favorable for energy transfer from Pr3+ to Mn2+. Such energy transfer is observed in the co-doped sample, converting the violet emission (410 nm) of Pr3+ into the red emission (615 nm) of Mn2+. The concentration dependence of transfer efficiency is also investigated.