[Study of spectra characteristics of Dy3+ -activated LiSrBO3 phosphor].

The LiSrBO_3:Dy~(3+)phosphor was synthesized by solid-state method.SrCO_3(99.9%),Li_2CO_3(99.9%),H_3BO_3 (99.9%)and Dy_2O_3(99.9%)were used as starting materials.After these individual materials were blended and grounded thoroughly in an agate mortar,the homogeneous mixture was heated at 700℃for 2 h in air,and LiSrBO_3:Dy~(3+)phosphors were obtained.The phase present of the samples was characterized by powder X-ray diffraction(XRD)(D/max-rA,Cu Kα,40 kV, 40 mA,λ=0.154 06 nm).The excitation and emission spectra of these phosphors were measured by a RF-540 photoluminescence spectrophotometer.The emission spectrum of LiSrBO_3:Dy~(3+)phosphor shows several bands at 486,578 and 668 nm,respectively. The excitation spectrum for 578 nm emission has several excitation bands at 331,368,397,433,462 and 478 nm, respectively.The effect of Dy~(3+)concentration on the emission intensity of LiSrBO_3:Dy~(3+)was investigated,and the result shows that the emission intensity of LiSrBO_3:Dy~(3+)phosphor firstly increases with increasing Dy~(3+)concentration,then decreases, viz.the concentration quenching exists.And the Dy~(3+)concentration corresponding to the maximal emission intensity is 3 mol%,and the concentration quenching mechanisms are the d-d interaction by Dexter theory.