Short-range structure and photoluminescent properties of the CaTiO3:Pr,La phosphor
Short-range structure and photoluminescent properties of the CaTiO3:Pr,La phosphor
复制标题
DOI：
10.1016/j.jallcom.2016.07.090
复制
发表时间：
2016-12
影响因子：
6.2
通讯作者：
G. Ribeiro;F. S. Vicente;M. Bernardi;A. Mesquita
中科院分区：
文献类型：
--
作者：
G. Ribeiro;F. S. Vicente;M. Bernardi;A. Mesquita
Pr 3+掺杂的CaTiO 3钙钛矿是一种有前途的磷光体化合物，有可能用于多种技术应用。在本文中，我们报道了用La 3+离子取代Ca 2+离子，以促进Ca空位，以进一步增强光致发光（PL）。本文采用聚合物前驱体法制备了CaTiO_3：Pr，La样品，研究了它们的短程和长程结构及光致发光性能。PL测量显示出中心位于612 nm处的窄发射，这是Pr 3+离子1D 2 - 3 H4跃迁的典型特征。随着La含量的增加，该峰的强度增加。CaTiO 3：Pr，La样品的PL曲线的增强与La掺入引起的CaTiO 3晶格中的无序有关。作为La含量的函数的这种无序通过Ti K边缘处的X射线吸收近边缘结构（XANES）光谱和拉曼光谱测量示出。CaTiO_3：Pr、La样品没有长余辉发光。
Pr3+-doped CaTiO3perovskite is a promising phosphor compound with the possibility of use in several technological applications. In this paper, we report the substitution of Ca2+ions with La3+ions in order to promote Ca vacancies to further enhance photoluminescence (PL). CaTiO3:Pr,La samples were prepared by the polymeric precursor method and their short- and long-range structure and photoluminescent properties were investigated in this paper. PL measurements show a narrow emission centered at 612 nm typical of the1D2–3H4transition of Pr3+ions. As the La content increases, the intensity of this peak is increased. This enhancement of PL curves for CaTiO3:Pr,La samples is associated with disorder in the CaTiO3lattice caused by the La incorporation. This disorder as a function of the La content is shown by both X-ray absorption near edge structure (XANES) spectra at the Ti K-edge and Raman spectroscopy measurements. CaTiO3:Pr,La samples do not present PL with long term afterglow.