Synthesis and luminescence properties of Eu3+, Dy3+ co-doped Ca3Bi(PO4)3 single-phase phosphor

In this work, we synthesize Ca 3 Bi(PO 4 ) 3 :Dy 3+ , Ca 3 Bi(PO 4 ) 3 :Eu 3+ , and Ca 3 Bi(PO 4 ) 3 :Eu 3+ , Dy 3+ . The crystal structure, phase purity, and the luminescence properties of samples are investigated, respectively. Ca 3 Bi(PO 4 ) 3 :Dy 3+ under excitation at 350 nm shows yellow emission because of the 4 F 9/2  →  6 H 15/2 , 6 H 13/2 , 6 H 11/2 , and 6 H 9/2 transitions of Dy 3+ . Ca 3 Bi(PO 4 ) 3 :Eu 3+ with excitation at 394 nm emits red-orange emission due to the 5 D 0 → 7 F 1 , 7 F 2 , 7 F 3 , and 7 F 4 transitions of Eu 3+ ion. Ca 3 Bi(PO 4 ) 3 :Dy 3+ , Eu 3+ with excitation at 394 nm mainly shows the emission of Eu 3+ , however, that with excitation at 350 nm mainly derive from Dy 3+ ion. We investigate the effects of the ratio between Dy 3+ and Eu 3+ in Ca 3 Bi(PO 4 ) 3 :Eu 3+ , Dy 3+ on the luminescence properties. The energy transfer from Dy 3+ to Eu 3+ in Ca 3 Bi(PO 4 ) 3 :Eu 3+ , Dy 3+ is found. We analyze the luminous mechanism of samples by energy level diagrams of Dy 3+ and Eu 3+ ions. The results are helpful for the research of other Dy 3+ and Eu 3+ co-doped luminescence materials.