Abstract: Ca_3B_2O_6:Eu~(3+) red phosphor was synthesized by high temperature solid state reaction and its luminescent properties were investigated. XRD analysis indicated the pure Ca_3B_2O_6:Eu~(3+) crystallite was obtained at 1 100 ℃ for 2 h. Excitation spectrum consists of wide band located at 220 to 350 nm and a series of narrow bands located at 350 to 500 nm which are attributed to f-f transitions of Eu~(3+) ion. The peaks of excitation spectra are 280, 396 and 469 nm, respectively. This phosphor can be excited effectively by near-ultraviolet light-emitting diodes (UVLED). The peaks of emitting spectra are 578,590,610,618 and 650 nm, corresponding to ~5D_4→~7F_J(J=0,1,2,3)typical transitions of Eu~(3+), respectively. The effects of charge compensations and the molar concentration of Eu~(3+) on the emission intensity were also studied. The intensity of Ca_3B_2O_6:Eu~(3+) was improved obviously with the increasing concentration of Eu~(3+), but the concentration quench did not observed. The role of charge compensations of Li~+, Na~+ and K~+ ions can all increased the luminescent intensity of Ca_3B_2O_6:Eu~(3+). Li~+ ion gave the best improvement to enhance the intensity of the emission obviously. Li~+ ion is the optimal charge compensation.

Key words: Ca_3B_2O_6:Eu~(3+) phosphor, high temperature solid state, charge compensation