铕掺杂钛酸盐体系红色荧光粉的溶胶—凝胶法制备及性能研究
发布时间：2018-07-13 14:56
【摘要】：稀土离子独特的发光特性,使其在发光材料应用领域中有着不可代替的作用。Eu3+为激活剂的发光材料已成为红色荧光粉的重要来源,Eu3+的发光性质与之匹配的基质材料的种类、晶相密切相关,所以研究不同基质材料中Eu3+的发光性质受到普遍关注。钛酸盐是一类新型的,物理化学性质稳定的发光基质材料,本文选取钛酸锌、钛酸镁、钛酸镧钠、钛酸钇钠作为基质,采用溶胶-凝胶法制备了Eu3+掺杂ZnTiO3和Zn2TiO4,Eu3+、Gd3+共掺杂MgTiO3,Eu3+掺杂Na2La2Ti3O10和Eu3+掺杂NaYTiO4基红色荧光粉。以X-射线衍射(XRD)、差热-热重(DTA-TGA)、红外光谱(IR)等技术对制备样品的结构进行了表征,通过荧光光谱及色坐标对其发光性质进行了研究。采用溶胶-凝胶法制备了Eu3+掺杂ZnTiO3和Zn2TiO4发光材料,经500℃退火处理后,样品呈现立方相ZnTiO3,当退火温度达到700℃时,样品呈现四方相Zn2TiO4。通过Eu3+掺杂ZnTiO3和Zn2TiO4发光材料的激发及发射光谱,发现均以465nm蓝光作为最佳激发波长,可以得到以Eu3+的5D 0→7F 2跃迁为主的红色荧光粉。通过计算Eu3+掺杂ZnTiO3和Zn2TiO4的色坐标值,得知Eu3+掺杂ZnTiO3的色坐标值为(0.6233,0.3762),接近于美国国家电视标准委员会NTSC标准值(0.670,0.330)。有望成为适用于蓝光LED芯片的新型红光材料。利用溶胶-凝胶法制备了MgTiO3:Eu3+、Gd3+红色荧光粉。对Eu3+及Eu3+、Gd3+共掺后MgTiO3红色荧光粉中Gd3+对MgTiO3:Eu3+体系中Eu3+发光性质的影响进行了研究。在MgTiO3:Eu3+、Gd3+体系中Eu3+的发光强度强于Eu3+的单一掺杂。说明在MgTiO3:Eu3+、Gd3+样品中,Eu3+和Gd3+离子之间发生了能量传递,提高了Eu3+在MgTiO3基质中的发光性能。以乙二醇为稳定剂,利用溶胶-凝胶法合成了Eu3+掺杂Na2La2Ti3O10红色发光材料。经600℃退火处理后,得到中间产物立方相Na0.5La0.5TiO3,当退火温度达到700℃时,得到终产物四方相Na2La2Ti3O10。通过Na2La2Ti3O10:Eu3+样品的激发光谱及发射光谱,发现最佳激发波为397nm,以397nm紫外光作为激发能量,得到了以Eu3+的5D0→7F2电偶极跃迁为主的红色荧光粉。通过计算Na2La2Ti3O10:Eu3+的色坐标值为(0.6251,0.3744),接近于NTSC标准色坐标值(0.670,0.330)。研究了Eu3+掺杂NaYTiO4红色发光材料,XRD结果表明,经过800℃焙烧2h后得到纯的四方相结构NaYTiO4:Eu3+荧光粉。通过分析NaYTiO4:Eu3+样品的激发光谱和发射光谱,发现最佳激发波长为397nm,以397nm紫外光作为激发波长,得到了以Eu3+的5D0→7F2电偶极跃迁为主的红色发光材料。以ZnTiO3、Zn2TiO4、MgTiO3、Na2La2Ti3O10、NaYTiO4为基质材料,以最为常见的Eu3+为激活剂,采用简单易于操作的溶胶-凝胶法,制备出发光性能优良的钛酸盐基质红色荧光粉材料,为更加丰富稀土发光材料的领域,拓宽钛酸盐的应用范围提供了信息。
[Abstract]:Due to its unique luminescence properties, rare earth ions play an irreplaceable role in the application of luminescent materials. EU3 as an activator has become an important source of red phosphors. Because the crystal phase is closely related, the luminescence properties of EU _ 3 in different matrix materials have been paid more and more attention. Titanate is a new kind of luminescent substrate with stable physical and chemical properties. Zinc titanate, magnesium titanate, sodium lanthanum titanate and sodium yttrium titanate are selected as the substrate in this paper. Eu3-doped ZnTiO3 and Zn2TiO4E3-Gd3 co-doped MgTiO3- EU3-doped Na2La2Ti3O10 and Eu3-doped NaYTiO4-based red phosphors were prepared by sol-gel method. The structure of the prepared samples was characterized by X-ray diffraction (XRD), differential thermogravimetry (DTA-TGA) and infrared spectroscopy (IR). The luminescent properties of the samples were studied by fluorescence spectra and color coordinates. EU3-doped ZnTiO3 and Zn2TiO4 luminescent materials were prepared by sol-gel method. After annealing at 500 鈩，
本文编号：2119779
[Abstract]:Due to its unique luminescence properties, rare earth ions play an irreplaceable role in the application of luminescent materials. EU3 as an activator has become an important source of red phosphors. Because the crystal phase is closely related, the luminescence properties of EU _ 3 in different matrix materials have been paid more and more attention. Titanate is a new kind of luminescent substrate with stable physical and chemical properties. Zinc titanate, magnesium titanate, sodium lanthanum titanate and sodium yttrium titanate are selected as the substrate in this paper. Eu3-doped ZnTiO3 and Zn2TiO4E3-Gd3 co-doped MgTiO3- EU3-doped Na2La2Ti3O10 and Eu3-doped NaYTiO4-based red phosphors were prepared by sol-gel method. The structure of the prepared samples was characterized by X-ray diffraction (XRD), differential thermogravimetry (DTA-TGA) and infrared spectroscopy (IR). The luminescent properties of the samples were studied by fluorescence spectra and color coordinates. EU3-doped ZnTiO3 and Zn2TiO4 luminescent materials were prepared by sol-gel method. After annealing at 500 鈩，
本文编号：2119779
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