研究了Dy3+激活的LiSrBO3材料的光谱特性。 材料的发射光谱为一多峰宽谱,主峰分别为486,578和668 nm;监测578 nm发射峰时所得材料的激发光谱为一多峰宽谱,主峰分别为331,368,397,433,462和478 nm。 研究了Dy3+掺杂浓度对材料发射光谱的影响,结果显示,随Dy3+浓度的增大,黄、蓝发射峰强度比(Y/B)逐渐增大;同时材料的发光强度随Dy3+浓度的增大呈现先增大后减小的趋势,在Dy3+浓度为3 mol%时到达峰值,其浓度猝灭机理为电偶极-偶极相互作用。 引入Li+,Na+和K+均可提高材料的发射强度。

The LiSrBO3:Dy3+ phosphor was synthesized by solid-state method. SrCO3(99.9%),Li2CO3(99.9%),H3BO3(99.9%) and Dy2O3(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 LiSrBO3:Dy3+ 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 LiSrBO3:Dy3+ 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 Dy3+ concentration on the emission intensity of LiSrBO3:Dy3+ was investigated,and the result shows that the emission intensity of LiSrBO3:Dy3+ phosphor firstly increases with increasing Dy3+ concentration,then decreases,viz. the concentration quenching exists. And the Dy3+ concentration corresponding to the maximal emission intensity is 3 mol%,and the concentration quenching mechanisms are the d-d interaction by Dexter theory.