摘要
用高温固相法在空气中制备了Bi掺杂碱土金属氟磷酸盐[(M5(PO4)3F,M=Ca,Sr,Ba)]荧光粉,通过X射线衍射和荧光光谱对其晶体结构和紫外–可见发光性质进行了分析。结果表明:观察所有样品都得到Bi3+位于紫外波段的特征发光,观察Ca5(PO4)3F:Bi和Sr5(PO4)3F:Bi样品可同时到源于Bi2+明亮的黄白色宽带发射。根据光谱结果和结构特性,分析Bi在氟磷酸盐中的多价态特性及形成机理,结果显示:在氟磷酸盐中存在2种Bi3+发光中心,分别占据2种不同的阳离子(M2+)格位;在Ca5(PO4)3F:Bi和Sr5(PO4)3F:Bi中,位于M2+(1)位点的Bi3+可被电荷补偿等因素的非常规还原作用还原为Bi2+,Bi掺杂的Ca5(PO4)3F和Sr5(PO4)3F有望成为一类新型的黄白色荧光粉。
Alkaline earth fluorophosphates doped Bi （M5（PO4）3F,M=Ca,Sr, Ba） were synthesized by a high temperature solid-state method in air. The samples were characterized by X-ray diffraction and photoluminescence spectroscopy, respectively. The results show that all the samples exhibit ultraviolet （UV） luminescence of Bi^3＋. The yellow-white broadband emission from Bi^2＋ was observed in the Bi doped Ca5（PO4）3F and Sr5（PO4）3F. According to the emission data with the lattice sites of samples, there were two types of Bi ions, i.e., Bi^3＋ and Bi^2＋ in Ca5（PO4）3F and Sr5（PO4）3F crystals, and each located on one of the two M lattice sites. The Bi^3＋ ion occupying M^2＋（1） sites was reduced to Bi^2＋ due to the self-reduction and the ionic radii in alkaline earth fluorophosphates. It was indicated that Ca5（PO4）3F and Sr5（PO4）3F doped Bi could be promising candidates for yellow phosphors.
出处
《硅酸盐学报》
EI
CAS
CSCD
北大核心
2013年第4期511-515,共5页
Journal of The Chinese Ceramic Society
基金
国家"973"计划(No.2011CB211708)
国家自然科学基金(No.61265007)
云南省青年自然科学基金(No.2012FD010和2012FD009)
昆明理工大学分析测试基金(No.2011010和2011061)资助项目
关键词
碱土金属氟磷酸盐
铋离子
晶体结构
自还原
alkaline earth fluorophosphates
bismuth ion
crystal structure
self-reduction
