发光二极管用红色荧光粉Sr_(0.8-x)Ba_(x)Eu_(0.2)WO_(4)的制备和性质研究  

Preparation and luminescent properties of Sr_(0.8-x)Ba_xEu_(0.2)WO_4 red phosphors for white LED

作　　者：毛金伟[1] 吕树臣[1] 曲秀荣[1] 何冬丽[1] 孟庆裕[1] 

机构地区：[1]哈尔滨师范大学,光电带隙材料省部共建教育部重点实验室,哈尔滨150025

出　　处：《物理学报》2013年第3期401-407,共7页Acta Physica Sinica

基　　金：黑龙江省教育厅科学技术研究重点项目(批准号:12511z013);国家自然科学基金(批准号:51002041)资助

摘　　要：采用化学共沉淀法制备了不同Ba2+掺杂浓度、不同煅烧温度的Sr(0.8-x)BaxEu0.2WO4红色荧光粉.研究了样品的晶体取向和晶格畸变对发光性质的影响,实验结果表明:合成的Sr(0.8-x)BaxEu0.2WO4红色荧光粉为四方相,样品中Eu3+的5D0—7F2跃迁的红光能被近紫外光和蓝光有效激发.适量的Ba2+离子取代部分的Sr2+提高了Sr(0.8-x)BaxEu0.2WO4荧光粉的发光强度,Ba2+掺杂浓度的改变对基质的晶格参数、晶体对称性和发光性能影响较大,Ba2+的最佳掺杂量为30%.Sr0.8-xBaxEu0.2WO4 red phosphors with different Ba2＋ doping concentrations is prepared by the co-precipitation method at different sintering temperatures. We study the influences of the crystal orientation and lattice distortion of the samples on the luminescence property. The results show that the Sr0.8-xBaxEu0.2WO4 synthesized by the process has a phase with tetragonal structure and that the red emission 5Do-7F2 of Eu3＋ in the sample can be excited effectively by the near-UV light and blue light. The part of Sr2＋ replaced with Ba2＋ leads to the increase in emission intensity of Sr0.8-xBaxEu0.2WO4. The doping concentration of Ba2＋ has a great influence on the crystal parameter, the crystal symmetry and the luminescent property. The optimized doping concentration of Ba2＋ is found to be 30%.

关 键 词：白光发光二极管 共沉淀法 Sr_(0.8-x)Ba_(x)Eu_(0.2)WO_(4) 光致发光 

分 类 号：TN312.8[电子电信—物理电子学] O482.3[理学—固体物理]