LiM(M=Ca,Sr,Ba)BO_3∶Dy^(3+)材料的发光特性

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

采用固相法制备了LiM(M=Ca,Sr,Ba)BO3∶Dy3+材料,并研究了材料的发光特性。LiM(M=Ca,Sr,Ba)BO3∶Dy3+材料的发射光谱均呈多峰发射,对应于Ca,Sr,Ba,其主发射峰分别是Dy3+的4F9/2→6H15/2(484,486,486nm),6H13/2(577,578,578nm)和6H11/2(668,668,666nm)跃迁。监测黄色发射峰时,所得激发光谱峰值位置相同,主激发峰分别为331,368,397,433,462,478nm,对应Dy3+的6H15/2→4D7/2,6P7/2,6M21/2,4G11/2,4I15/2和6F9/2跃迁。研究了敏化剂Ce3+及电荷补偿剂Li+、Na+和K+对LiM(M=Ca,Sr,Ba)BO3∶Dy3+材料发光强度的影响。结果显示:加入敏化剂Ce3+提高了材料的发光强度,发光强度最大处对应的Ce3+浓度为3%;加入电荷补偿剂Li+、Na+和K+后,材料的发光强度也得到了明显提高,但发光强度最大处对应的Li+、Na+和K+浓度不同,依次为4%、4%和3%。

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, 4115/2 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.