新型红色荧光粉Na_2Ca_4(PO_4)_2SiO_4∶Eu^(3+),Bi^(3+)的制备及发光特性  

Synthesis and Luminescent Properties of Na_2Ca_4(PO_4)_2SiO_4∶Eu^(3+),Bi^(3+) Red-emitting Phosphor

作　　者：肖全兰[1] 刘关喜[1] 邹少瑜[1] 彭文芳[1] 杨创涛[1] 张蕤[1] 谢丽娟[1] 孟建新[2] 

机构地区：[1]暨南大学化学系,广东广州510632 [2]暨南大学纳米化学研究所,广东广州510632

出　　处：《发光学报》2011年第4期332-336,共5页Chinese Journal of Luminescence

基　　金：国家自然科学基金(30670523);中央高校基本科研业务费专项资金资助项目

摘　　要：用高温固相法合成了用于白光LED的Na2Ca4(1-x-y)(PO4)2SiO4∶xEu3+,yBi3+红色荧光粉。研究了助熔剂H3BO3、二次煅烧时间和稀土掺杂量等制备条件对样品发光性质的影响。结果表明,在1 200℃、助熔剂H3BO3加入量为样品质量的3.8%时可得到更有利于发光的α-NCPS基质,而且掺入Eu3+、Bi3+之后,基质的晶格结构没有发生明显变化;适宜的二次煅烧时间为1.5 h。Bi3+的共掺杂可以通过能量传递大幅提高Eu3+的发光强度,当Eu3+、Bi3+的摩尔分数分别为x=0.04和y=0.01时,粉体具有最强的红光发射。表明这种荧光粉是一种可很好用于近紫外芯片的白光LED的红色荧光粉。Novel red-emit phosphors,Na2Ca4（1-x-y）（PO4）2SiO4∶xEu3＋,yBi3＋ were synthesized for WLED by conventional solid-state reaction at 1 200 ℃.Effects of the H3BO3 flux,the re-calcination time and doping concentrations of Eu3＋,Bi3＋ on the luminescence properties were investigated.It was found that a higher Eu3＋ emission intensity can be obtained if 30% H3BO3 was added as flux.No apparently structure transformation of the Na2Ca4（PO4）2SiO4 matrix was observed after doping Eu3＋,Bi3＋.The phosphors give the characteristic emission of Eu3＋ at 615 nm under the excitation of 395 nm.Samples re-calcined at 1 200 ℃ for 1.5 h gives a strongest emission.The red emission of Eu3＋ can be significantly enhanced by co-doping of Bi3＋ via an energy transfer process which involves the charge transfer（CT） transition of Eu3＋-O2-→Bi3＋→Eu3＋.The optimized doping mole fractions of Eu3＋ and Bi3＋ are x=0.04 and y=0.01,respectively.It shows that the Na2Ca4-（PO4）2SiO4∶Eu3＋,Bi3＋ is a promising red phosphor for NUV-chips based WLED.

关 键 词：Na2Ca4(PO4)2SiO4∶Eu3+ Bi3+ 高温固相法 白光LED 红粉 

分 类 号：O482.31[理学—固体物理]