Abstract: A series of blue phosphorBa_1.92B₅O₉Cl:Eu²⁺_0.06 with different Ln³⁺(Ln=Dy,Er,Ho) co-dopants were synthesized via high temperature solid-state method. All samples were tested with X-ray diffraction, and photoluminescence spectra of the phosphors were measured with Fluorescence Spectrophotometer. The results show thatBa₂B₅O₉Cl：Eu^2+,Ln³⁺powders are tetragonal systems. The position and shape of the main peaks of photoluminescence spectra and excitation spectra have not changed except the intensity of the peaks after the rare earth Ln³⁺(Ln=Dy,Er,Ho) were co-doped. The co-doped Ln³⁺can prolong the persistence and enhance the intensity of afterglow and thermoluminescence inordinately. Among them, Dy³⁺ is the best one.  

Key words: blue phosphor; long afterglow; choroborates barium; thermluminescence