研究了Ce3+在碱金属-碱土金属硼酸盐体系LiCaBO3, LiSrBO3和LiBaBO3中的光谱特性, 发现Ce3+在该体系中均呈现非对称的宽谱发射, 对应的发射光谱主峰分别为428, 436和440 nm； 分别监测三个主发射峰, 所得激发光谱主峰分别为364、 369和370 nm。 研究了电荷补偿剂Li+, Na+, K+对3种材料发射强度的影响, 结果显示, 材料的发射强度明显提高,其中以掺入Li+时效果最明显。Borate System

Alkali-alkaline earth borate LiCaBO3∶Ce3+, LiSrBO3∶Ce3+ and LiBaBO3∶Ce3+ were investigated by solid-state method. CaCO3(99.9%), SrCO3(99.9%), BaCO3(99.9%), Li2CO3(99.9%), Na2CO3(99.9%), K2CO3(99.9%), H3BO3(99.9%) and CeO2(99.9%)were used as starting materials, After these individual materials were blendedand ground thoroughly in an agate mortar, the homogeneous mixture was heated at700 ℃ for 2 h in a reduced atmosphere (5∶95(H2/N2)), and these three phosphorswere obtained. The excitation and emission spectra of these phosphors weremeasured by a SHIMADZU RF-540 fluorescence spectrophotometer. The spectralcharacteristics of Ce3+ in alkali-alkaline earth borate LiCaBO3, LiSrBO3 andLiBaBO3 were investigated. The emission spectra of Ce3+ in these three phosphorsall exhibited a dissymmetrical band, and the emission peaks were located at 428,436 and 440 nm, respectively. The excitation spectra for 428, 436 and 440 nmemission of these three phosphors showed a dissymmetrical band at 364, 369 and370 nm, respectively. The effects of Li+, Na+ and K+ on the emission intensitiesof these three phosphors were studied. The results show that the emissionintensities of these phosphors were enhanced, and the maximal emission intensityof doping Li+ is higher than that of Na+ and K+.教育厅基金项目(2009313)资助