Luminescent Characteristics of LiM(M=Ca,Sr,Ba)BO_3∶Dy~(3+) Phosphor

LiM(M=Ca,Sr,Ba)BO3∶Dy3+ phosphors were synthesized by solid state reaction,and their luminescet characteristics were investigated. The emission spectra of LiM(M=Ca,Sr,Ba)BO3∶Dy3+ phosphors show several bands,and the main emission peaks corresponding to Ca,Sr and Ba ion are the 4F9/2→6H15/2(484,486 and 486 nm),6H13/2(577,578 and 578 nm) and 6H11/2(668,668 and 666 nm) typical transitions of Dy3+. The excitation spectra for the yellow emission have the same excitation peaks located at 331,368,397,433,462 and 478 nm,corresponding to the 6H15/2→4D7/2,6P7/2,6M21/2,4G11/2,4I15/2 and 6F9/2 transitions of Dy3+. The effects of doping Ce3+or Li+,Na+,K+ on the luminescence intensities of LiM(M=Ca,Sr,Ba)BO3∶Dy3+ phosphors were studied,and the results showed that the intensities of LiM(M=Ca,Sr,Ba)BO3∶Dy3+ phosphors are obviously effected. The intensities increase with increasing Ce3+ concentration and reache the maximum value at 3%. Under the condition of doping Li+,Na+ and K+,the intensities are enhanced,however,the charge compensation concentration corresponding to the maximum emission intensity is different with different charge compensation ions,and the optimal concentrations are 4%,4% and 3% corresponding to Li+,Na+ and K+,respectively.