Photoluminescence Properties of Pr-Doped (Ca,Sr,Ba)TiO₃

Abstract

Photoluminescence properties of Pr-doped alkaline-earth titanates Pr 0.002 (Ca,Sr,Ba) 0.997 TiO 3 are investigated by emission, excitation, and diffuse reflectance spectra at room temperature. The intensities of red luminescence and absorption due to f-f transition of Pr 3+ ions increase in the order of Pr-doped cubic SrTiO 3 , tetragonal BaTiO 3 , and orthorhombic CaTiO 3 . The small red luminescence for Pr-doped SrTiO 3 is increased by substituting Sr by Ca and Ba even if the substituted samples have the same cubic structure as SrTiO 3 and the lattice parameters are close to that of SrTiO 3 . The red luminescence intensity is intense for orthorhombic samples of which the excitation spectra show a peak corresponding to valenceto-conduction band edge and a shoulder referred to as B band. The photoluminescence properties are discussed in relation to the crystal structure.

The role of oxygen vacancy in the photoluminescence property at room temperature of the CaTiO3

“…[1][2][3][4][5][6] In particular, much work has been concentrated on CaTiO 3 ͑CT͒ luminescence. [7][8][9][10][11] These studies have shown that the broad PL emission band covering a large part of the visible spectra of the structurally disordered compounds is very similar to nanocrystalline PL emission.…”

Structural refinement and photoluminescence properties of irregular cube-like (Ca1−xCux)TiO3 microcrystals synthesized by the microwave–hydrothermal method

“…Crystalline ceramics mainly perovskite-type mixed metal oxide of chemical formula (ABO 3 ) have attracted attention over the years due to their physical and chemical properties, which can be changed by easy substitution in both the A and B-sites with several compositions [1,2]. In particular, titanium-based perovskite oxides with formula ATiO 3 (A ¼ Pb, Sr, Ba, Zn, Ni, or Fe) presents outstanding potential in electronics [3], gas sensors [4], catalysis [5], memory devices [6], magnetic material [7], and so on.…”

Red shift and higher photoluminescence emission of CCTO thin films undergoing pressure treatment

“…The order-disorder structure is one of the most accepted models to explain titanate crystalline PL emission at room temperature [7][8][9]. In general, neither completely ordered nor completely disordered systems exhibit PL; consequently, a medium range order-disorder is necessary for PL emission [10][11][12].…”