Luminescence characteristics of Ca4YO(BO3)3 doped with Bi3+, Dy3+ and Pr3+ ions

The photoluminescence (PL) properties of Ca4YO(BO3)3 doped with Bi3+, Dy3+, and Pr3+ ions were investigated. These compounds were prepared using a typical solid-state reaction. The excitation and emission spectra were measured using a spectrofluorometer. For Ca4YO(BO3)3:Bi3+, the excitation spectrum showed the bands at about 228, 309, and 370 nm which correspond to the 1S0→1P1 transition and the 1S0→3P1 transition of Bi3+ ions. The emission band at 390 nm corresponded to the 3P1→1S0 transition of Bi3+ ions. For Ca4YO(BO3)3: Bi3+,Dy3+, energy transfer occurred from Bi3+ to Dy3+ somewhat. In Ca4YO(BO3)3:Bi3+,Dy3+,Pr3+, the excitation band at 367 nm was enhanced obviously due to the energy migration from Bi3+ to Pr3+, which converted efficiently the emission of semiconductor InGaN based light-emitting diode (LED). Therefore, the emission of Dy3+ ions was enhanced due to the energy migration from the process of Bi3+→Pr3+→Dy3+. It resulted in the good color rendering.