摘要
采用高温固相法合成了Ca9La(PO4)7:Dy3+发光材料.荧光粉的晶体结构和微观尺寸由X射线粉末衍射(XRD)仪和扫描电子显微镜(SEM)测定.光致激发和发射光谱发光揭示了材料的光学特性.实验结果显示:Ca9La(PO4)7:Dy3+能够有效吸收紫外-可见光(300 460 nm)而被激发,呈现一系列的吸收峰.样品在350 nm近紫外光激发下,有较强的蓝光(481 nm)和黄光(573 nm)两个窄带发射,混合成优质的白光发射,该白光色坐标在国际照明委员会(CIE)色品图中分布在无色点D65(0.313,0.329)周围.随着掺杂Dy3+离子的摩尔分数的增加,两种发射均发生浓度猝灭现象,Dy3+离子的最佳掺杂为0.05(摩尔分数),电偶极电偶极相互作用是主要的猝灭机理.
Dy3＋-doped Ca9La（PO4）7 phosphors were synthesized by a high-temperature solid-state reaction. X-ray diffraction （XRD） and scanning electron microscopy （SEM） were used to determine the crystal structure and size of the prepared materials. Photoluminescence excitation and emission spectra of the Ca9La（PO4）7：Dy3＋ phosphors were measured. The samples exhibited a broad absorption band in the range of 300-460 nm and a series of individual absorption peaks of Dy3＋. Blue （481 nm） and yellow （573 nm） emissions combined to generate the observable white-light emission of the Ca9La（PO4）7：Dy3＋ phosphors with suitable Commission Internationale de L＇Eclairage （CIE） chromaticity coordinates around the colorless point （0.313, 0.329） when the phosphors were excited at 350 nm. Concentration quenching was clearly observed as the concentration of Dy3＋ dopant was increased. The most intense emission corresponded to a optimum molar fraction of doped Dy3＋ ions of 0.05. The mechanism of concentration quenching was dominated by etectric dipole-dipole interactions.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
2013年第10期2271-2275,共5页
Acta Physico-Chimica Sinica
基金
广东省重大科技专项(2011A080801015)
广东省佛山市南海绿色照明专项(A201107)
国家自然科学基金(21271048)资助~~
