Ce^(3+)、Sm^(3+)共掺杂YAG的制备及其发光性能的研究

Study on preparation of YAG:(Ce^(3+)-Sm^(3+)) in co-precipitation method and their fluorescence spectrum

用共沉淀法合成YAG:(Ce3+-Sm3+)前驱体后,在N2还原气氛下用高温灼烧法制备YAG:(Ce3+-Sm3+)荧光粉,并对Sm3+的掺杂浓度、样品的晶相以及表面形貌进行研究。同时,也对Sm3+与Ce3+之间Sm3+→Ce3+的能量转移机理进行了讨论。当Sm3+掺杂浓度(Sm3+/Ce3+为10%)时,其发射光谱强度能增加约3倍,并伴有明显的红移;合成的荧光粉体粒径大小在2～4μm时,有望与不同波长的蓝光LED组合,以期获得不同性质的白光LED。

The YAG： （Ce^3＋ -Sm^3＋ ） precursors were prepared by using the chemical co-precipitation method. Then they were synthesized by combustion method in nitrogen atmosphere. The Sm concentra- tion, crystal phases and surface morphology of the samples were investigated. The energy transfer of Sm^3 ＋→Ce^3 ＋ in YAG ： （ Ce^3＋ -Sm^3 ＋ ） powders was also discussed. The fluorescence intensity of YAG： Ce^3＋ modified by Sm^3＋ which is 10% of Ce^3＋ can be enhanced by three times. The obvious red shift was also found at the same time. The red phosphor was sized 2 -4μm which is useful for LED applications.