掺杂和取代对红色荧光材料SrAl_(12)O_(19):Mn^(4+)发光性能的影响（英文）  

Doping and Replacing Effects on the Luminescent Properties of SrAl_(12)O_(19):Mn^(4+) Red Phosphor

作　　者：辛小东 魏恒伟 赵文慧[3] 刘中仕 李文先[1] 焦桓[2] 荆西平[3] 

机构地区：[1]内蒙古大学化学与化工学院,呼和浩特010021 [2]陕西省大分子科学重点实验室陕西师范大学化学与化工学院,西安710062 [3]稀土材料化学与应用国家重点实验室北京大学化学与分子工程学院,北京100871 [4]欧司朗(中国)有限公司,上海200082

出　　处：《无机化学学报》2016年第7期1199-1206,共8页Chinese Journal of Inorganic Chemistry

基　　金：国家自然科学基金(No.21371015)资助项目

摘　　要：SrAl_(12)O_(19):Mn^(4+)是一种用于高显色性白光发光二极管的候选红色荧光材料。本论文研究了Mg^(2+)、Zn^(2+)和Ge^(4+)离子的掺杂效应以及Ga^(3+)、Ca^(2+)和Ba^(2+)离子的取代效应对SrAl_(12)O_(19):Mn^(4+)荧光材料性能的影响。样品通过高温固相反应制备,焙烧温度在1250~1500℃之间。利用X射线衍射技术表征了材料的相纯度,用荧光激发光谱和发射光谱表征了材料的荧光性能。研究结果指出,与未进行Mg^(2+)或Zn^(2+)掺杂的样品相比,Mg^(2+)或Zn^(2+)离子对Al^(3+)格位的掺杂可以使材料的发光强度提高~60%,其原因被认为是掺杂促进了激活剂Mn^(4+)离子进入晶格,其过程可以表示为:MO+MnOM_(Al)'+Mn_(Al)+30o~×(M=Mg,Zn),电子顺磁共振谱支持这一结果。Ge^(4+)离子的掺杂使材料的发光性能明显下降。Ga^(3+)离子可以取代Al^(3+)离子形成全范围的固溶体,其中少量Ga^(3+)离子的掺杂可以使材料的荧光发射强度提高~13%,而掺杂量进一步提高使材料的荧光性能下降。Ca^(2+)和Ba^(2+)对Sr^(2+)的取代仅形成有限范围的固溶体。Ca^(2+)的取代使材料的发光性能提高;而Ba^(2+)的取代使材料的发光强度下降。SrAl12O19：Mn4＋ is a potential candidate of red phosphor for high color rendering white LEDs. In this work, doping effects of Mg2＋, Zn2＋ or Ge4＋ and replacing effects of Ga3＋, Ca2＋ or Ba2＋ on the SrA112019：Mn4＋ red phosphor were investigated. The samples were prepared by conventional solid state reactions at 1 250-1 500 ℃. The phase purities of the samples were investigated by X-ray diffraction and their luminescence properties were characterized by photoluminescence （PL） excitation and emission spectra. The results indicated that compared with the sample without the Mg2＋ or Zn2＋ doping, the Mg2＋ or Zn2＋ doping enhanced the PL intensity significantly （-60%）, since this doping helped Mn4＋ enter the lattice： MO＋MnO2 MAl＇ ＋MnAl＇ ＋3Oox（M=Mg, Zn）, which was supported by electron paramagnetic resonance spectra. The Ge4＋ doping lead to a decrease of PL intensity clearly. Ga3＋ could replace Al3＋ to form whole range solid solutions. When small amount of Ga3＋ was doped, the PL intensity increased （-13%）, however when further increasing the Ga3＋ content, the PL intensity decreased dramatically. The solid solutions only appeared in limited ranges for the Sr2＋ replaced systems by Ca2＋ and Ba2＋. For the Ca2＋ replacing system, the PL intensity increased with an increase of Ca2＋ content, but for the Ba2＋ replacing system, the PL intensity decreased with Ba2＋ content.

关 键 词：红色荧光粉 白光发光二极管 SrAl12O19 Mn4+掺杂 

分 类 号：TB34[一般工业技术—材料科学与工程]