Short-range structure and photoluminescent properties of the CaTiO3:Pr,La phosphor

JOURNAL OF ALLOYS AND COMPOUNDS

卷:688

Article

Ribeiro, Guilherme K.¹  Vicente, Fabio S.¹  Bernardi, Maria Ines B.²  Mesquita, Alexandre¹ 

[1] Univ Estadual Paulista, UNESP, Dept Fis, Inst Geociencias & Ciencias Exatas, Rio Claro, SP, Brazil

[2] Univ Sao Paulo, Inst Fis Sao Carlos, Sao Carlos, SP, Brazil

关键词: CaTiO3;    Calcium titanate;    Praseodymium;    Lanthanum;    Photoluminescence;    Red phosphor;    XANES;    Raman;    Ca vacancies;    Short term afterglow;   

DOI  :  10.1016/j.jallcom.2016.07.090

来源: Elsevier

【 摘 要 】

Pr3+-doped CaTiO3 perovskite 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 the D-1(2) - H-3(4) transition 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 CaTiO3 lattice 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. (C) 2016 Elsevier B.V. All rights reserved.

【 授权许可】

Free