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Ca_2BO_3Cl:Ce~(3+),Ca_2BO_3Cl:Tb~(3+),and Ca_2BO_3Cl:Ce~(3+),Tb~(3+) phosphors are synthesized by a high temperature solid-state reaction.The emission intensity of Ce~(3+) or Tb~(3+) in Ca_2BO_3Cl is influenced by the Ce~(3+) or Tb~(3+) doping content,and the optimum concentrations of Ce~(3+) and Tb~(3+) are 0.03 mol and 0.05 mol,respectively.The concentration quenching effect of Ce~(3+) or Tb~(3+) in Ca_2BO_3Cl occurs,and the concentration quenching mechanism is d-d interaction for either Ce~(3+) or Tb~(3+).The Ca_2BO_3Cl:Ce~(3+),Tb~(3+) can produce colour emission from blue to green by properly tuning the relative ratio between Ce~(3+) and Tb~(3+),and the emission intensity of Tb~(3+) in Ca_2BO_3Cl can be enhanced by the energy transfer from Ce~(3+) to Tb~(3+).The results indicate that Ca_2BO_3Cl:Ce~(3+),Tb~(3+) may be a promising double emission phosphor for UV-based white light emitting diodes.
Ce3 +, Ca2BO3Cl: Ce ~ (3 +), Ca2BO3Cl: Ce ~ (3 +), Tb ~ (3 +) phosphors are synthesized by a high temperature solid-state reaction. Ce ~ (3+) or Tb ~ (3+) in Ca_2BO_3Cl is influenced by the Ce ~ (3+) or Tb ~ (3+) doping content, and the optimum concentrations of Ce ~ (3+) and Tb ~ 3+) are 0.03 mol and 0.05 mol respectively. The concentration quenching effect of Ce ~ (3+) or Tb ~ (3+) in Ca_2BO_3Cl occurs, and the concentration quenching mechanism is dd interaction for either Ce ~ (3+) or Tb ~ (3 +). The Ca_2BO_3Cl: Ce ~ (3 +), Tb ~ (3+) can produce color emission from blue to green by properly tuning the relative ratio between Ce ~ (3+) and Tb ~ (3) (3+), and the emission intensity of Tb ~ (3+) in Ca_2BO_3Cl can be enhanced by the energy transfer from Ce ~ (3+) to Tb ~ (3 +). The results indicate that Ca_2BO_3Cl: Ce ~ (3+) , Tb ~ (3+) may be a promising double emission phosphor for UV-based white light emitting diodes.