title: Blue-green tunable color of Ce(3+)/Tb(3+) coactivated NaBa3La3Si6O20 phosphor via energy transfer.
abstract: A series of color tunable phosphors NaBa3La3Si6O20:Ce(3+), Tb(3+) were synthesized via the high-temperature solid-state method. NaBa3La3Si6O20 crystallizes in noncentrosymmetric space group Ama2 with the cell parameters of a = 14.9226(4) Å, b = 24.5215(5) Å and c = 5.6241(2) Å by the Rietveld refinement method. The Ce(3+) ions doped NaBa3La3Si6O20 phosphors have a strong absorption band from 260 to 360 nm and show near ultraviolet emission light centered at 378 nm. The Ce(3+) and Tb(3+) ions coactivated phosphors exhibit color tunable emission light from deep blue to green by adjusting the concentration of the Tb(3+) ions. An energy transfer of Ce(3+) → Tb(3+) investigated by the photoluminescence properties and lifetime decay, is demonstrated to be dipole-quadrupole interaction. These results indicate the NaBa3La3Si6O20:Ce(3+), Tb(3+) phosphors can be considered as potential candidates for blue-green components for white light emitting diodes.
authors.affiliation: Key Laboratory of Coordination Chemistry and Functional Materials in Universities of Shandong, Dezhou University, Dezhou 253023, PR China.|Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.|University of Chinese Academy of Sciences, Beijing 100049, PR China.
authors.forename: Zhen
authors.initials: Z
authors.lastname: Jia
authors.affiliation: Beijing Center for Crystal Research and Development, Key Laboratory of Functional Crystals and Laser Technology, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, PR China.
authors.forename: Mingjun
authors.initials: M
authors.lastname: Xia