Investigation On Energy Transfer And Luminescent Properties Of K_3Gd(PO_4)_2: RE~_(3+) (RE = Eu, Tb) Under UV And VUV Excitation

摘要

K_3Gd(PO_4)_2:RE~_(3+) (RE = Eu, Tb) are prepared by solid-state reaction and their photoluminescence (PL) properties are investigated under UV and VUV excitation, respectively. The obtained experimental data show that no energy transfer happens among the activator ions Tb~(3+) or Eu~(3+) under UV excitation. Under 147-nm excitation, the strongest emission intensity of K_3Gd(PO_4)_2:RE~_(3+) (RE = Eu, Tb) is obtained when the activator ions Tb~(3+) or Eu~(3+) concentration is 0.8 mol, the integrate emission intensity of K_3Gd_(0.2)(P0_4)_2:0.8Tb~(3+) is about 204% of commercial phosphor Zn_(1.96)SiO_4:0.04Mn~(2+) with chromaticity coordinates of (0.340, 0.561) and the decay time of about 5.09 ms under 147-nm excitation. We analyze the ' experimental data and propose a possible energy-transfer mechanism under 147-nm excitation.