红色LiM(M=Ca,Sr,Ba)BO_3∶Re^(3+)(Re=Eu,Sm)发光材料的特性

Luminescence Characteristics of Red LiM(M=Ca,Sr,Ba)BO_3∶Re^(3+) (Re=Eu,Sm) Phosphor

采用固相法制备了红色LiM(M=Ca,Sr,Ba)BO3∶Re3+(Re=Eu,Sm)发光材料,研究了材料的发光性能。研究发现LiM(M=Ca,Sr,Ba)BO3∶Eu3+材料呈现多峰发射,最强发射分别位于610,615,613 nm处,分别监测这三个最强峰,所得激发光谱峰值位于369,400,470 nm。LiM(M=Ca,Sr,Ba)BO3∶Sm3+材料也呈多峰发射,分别对应Sm3+的4G5/2→6H5/2、4G5/2→6H7/2和4G5/2→6H9/2跃迁发射;分别监测602,599,597 nm三个最强发射峰,所得激发光谱峰值位于374,405 nm。研究了激活剂浓度对材料发射强度的影响,结果随激活剂浓度的增大,发射强度先增强后减弱,即,存在浓度猝灭效应。实验表明,加入电荷补偿剂Li+、Na+或K+均可提高LiM(M=Ca,Sr,Ba)BO3∶Re3+(Re=Eu,Sm)材料的发射强度。

IAM（M = Ca, Sr, Ba）BO3： Re^3＋ （Re = Eu, Sm） phosphors were synthesized by solid state reaction, and their luminescence characteristics were investigated. The emission spectra of LiM（M = Ca, Sr, Ba）- BO3： Eu^3＋ phosphors show several bands, and the main emission peaks correspond to the ^5D0→^7F1 （590,595 and 594 nm）, 5D0→^7F2（610, 615 and 613 nm） and ^5D0→^7F3（654,651 and 651 nm） typical transitions of Eu^3＋ The excitation spectra show that these phosphors can be effectively excited by 369, 400 and 470 nm. The emission spectra of LiM（ M = Ca, Sr, Ba） BO3 ： Sm^3 ＋ exhibit several bands, corresponding to ^4 G5/2→6 H5/2 （561, 563 and 560 nm）, ^4G5/2→^6H7/2（602, 599 and 597 nm） and ^4G5/2→^6H9/2 （651, 647 and 644 nm） typical transitions of Sm^3 ＋. The excitation spectra show that these phosphors can be effectively excited by 374 and 405 nm. Therefore, the two kinds of phosphors are promising red phosphors for white LEDs. Effects of ac- tivation and charge compensation on the luminescence intensities of LiM（ M = Ca, Sr, Ba） BO3 ： Re^3 ＋ （ Re = Eu, Sm） phosphors were studied, and the results show that the intensities were obviously influenced. Under the conditions of charge compensator Li^ ＋ , Na^ ＋ or K^ ＋ incorporated in these phosphors, the emission intensities of these phosphors were enhanced. The all results illuminate that LiM（M = Ca, Sr, Ba）BO3： Re^3＋（Re = Eu, Sm） phosphors are promising red phosphors for white LEDs.