Journal
OPTICAL MATERIALS
Volume 74, Issue -, Pages 46-51Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2017.03.021
Keywords
Red luminescence; Mn4+; Perovskite; Crystal field; LED
Categories
Funding
- Ministry of Education, Science and Technological Development of the Republic of Serbia [171022]
- Cluster of excellence MATISSE [ANR-11-IDEX-0004-02]
- DGA (Direction Generale de L'Armement, France)
- a [451-03-39/2016-09/19]
- Recruitment Program of High-end Foreign Experts [GDW20145200225]
- Ministry of Education and Research of Estonia [PUT430]
- European Regional Development Fund [TK141]
- g [451-03-39/2016-09/19]
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Herein, the synthesis, structural and crystal field analysis and optical spectroscopy of Mn4+ doped metal titanates ATiO(3) (A = Ca, Mg) are presented. Materials of desired phase were prepared by molten salt assisted sol-gel method in the powder form. Crystallographic data of samples were obtained by refinement of X-ray diffraction measurements. From experimental excitation and emission spectra and structural data, crystal field parameters and energy levels of Mn4+ in CaTiO3 and MgTiO3 were calculated by the exchange charge model of crystal-field theory. It is found that crystalline field strength is lower (Dq = 1831 cm(-1)) in the rhombohedral Ilmenite MgTiO3 structure due to the relatively longer average Mn4+-O2- bond distance (2.059 angstrom), and higher (Dq = 2017 cm(-1)) in orthorhombic CaTiO3 which possess shorter average Mn4+-O2- bond distance (1.956 angstrom). Spectral positions of the Mn(4+2)Eg -> (4)A(2g) transition maxima is 709 nm in MgTiO3 and 717 nm in CaTiO3 respectively in good agreement with calculated values. (C) 2017 Elsevier B.V. All rights reserved.
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