关键词: 白光LED；Ba₃P₄O₁₃:Ce³⁺, Tb³⁺荧光粉；发光性质

Abstract: The phosphors of Ba₃P₄O₁₃:Ce³⁺,Tb³⁺ were synthesized by a hightemperature solid state reaction. The luminescence properties of Ce³⁺dopedonly, Tb³⁺ dopedonly and Ce³⁺-Tb³⁺ co-doped were studied. Meanwhile, the energy transition phenomenon in the sample of Ce³⁺-Tb³⁺ co-doped was also observed. Seen from the excitation spectra, the peaks of Ce³⁺ shows a broad band characterization, while there are two peaks overlapped with each other in emission spectra. The emission peaks locating at 340 nm and 363 nm were both obtained through Gaussian fitting method. In the excitation spectra of Ba₃P₄O₁₃:Ce³⁺ samples: the peak of Tb³⁺ exhibited the strongest absorption at 220nm, and the emission from the levels of ⁵D₃ and ⁵D₄ of  Tb³⁺ was observed at the same time, indicating that nonradioactive process between them was inefficient. The photoluminescence properties and decay curves were carefully investigated in the samples of Ba₃P₄O₁₃:Ce³⁺,Tb³⁺ phosphors. The results reveal that an efficient energy transition from Ce³⁺  to Tb³⁺ in Ba₃P₄O₁₃ host is a kind of dipoledipole interaction in theory.

Key words: white LED; Ba₃P₄O₁₃:Ce³⁺, Tb³⁺  phosphor; luminescence properties