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Title: X-ray photoemission spectroscopy investigation of CaTiO{sub 3}:Eu for luminescence property: effect of Eu{sup 3+} ion

Abstract

Graphical abstract: The influence on the photoluminescent performance due to the electronic structure change in Eu-doped CaTiO{sub 3} of the specific core-level and valence band spectrum via X-ray photoemission spectroscopy were characterized. - Highlights: • Single phase CaTiO{sub 3} and CaTiO{sub 3}: Eu crystals were prepared under mild hydrothermal method. • Crystal structure, doping level and the relations to their luminescent property were discussed. • Charge compensation mechanism was discussed via valance band spectrum by XPS. - Abstract: Charge compensation of on-site Eu 4f–5d transition that determines the luminescent performance was confirmed with valance band spectrum. Influence of photoelectrons from CaTiO{sub 3}: Eu to the corresponding luminescent performance was discussed based on the crystal structure, doping level and the relations to their luminescent property. This paper is important to further optimize the luminescent performance for improving the efficiency and reducing the cost in light emitting diode industry.

Authors:
 [1];  [2];  [3]
  1. Third Hospital of Jilin University, Changchun 130031 (China)
  2. Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022 (China)
  3. State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, College of Chemistry, Jilin University, Changchun (China)
Publication Date:
OSTI Identifier:
22581552
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 78; Other Information: Copyright (c) 2016 Elsevier Science B.V., Amsterdam, The Netherlands, All rights reserved.; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE; 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; CALCIUM COMPOUNDS; CRYSTAL STRUCTURE; CRYSTALS; DOPED MATERIALS; ELECTRONIC STRUCTURE; EMISSION SPECTRA; EUROPIUM IONS; HYDROTHERMAL SYNTHESIS; LIGHT EMITTING DIODES; PHOTOEMISSION; PHOTOLUMINESCENCE; TITANATES; VALENCE; VISIBLE RADIATION; X-RAY DIFFRACTION; X-RAY PHOTOELECTRON SPECTROSCOPY

Citation Formats

Wang, Kaichen, Zhao, Baijun, and Gao, Lu, E-mail: gaolu@jlu.edu.cn. X-ray photoemission spectroscopy investigation of CaTiO{sub 3}:Eu for luminescence property: effect of Eu{sup 3+} ion. United States: N. p., 2016. Web. doi:10.1016/J.MATERRESBULL.2016.01.038.
Wang, Kaichen, Zhao, Baijun, & Gao, Lu, E-mail: gaolu@jlu.edu.cn. X-ray photoemission spectroscopy investigation of CaTiO{sub 3}:Eu for luminescence property: effect of Eu{sup 3+} ion. United States. doi:10.1016/J.MATERRESBULL.2016.01.038.
Wang, Kaichen, Zhao, Baijun, and Gao, Lu, E-mail: gaolu@jlu.edu.cn. 2016. "X-ray photoemission spectroscopy investigation of CaTiO{sub 3}:Eu for luminescence property: effect of Eu{sup 3+} ion". United States. doi:10.1016/J.MATERRESBULL.2016.01.038.
@article{osti_22581552,
title = {X-ray photoemission spectroscopy investigation of CaTiO{sub 3}:Eu for luminescence property: effect of Eu{sup 3+} ion},
author = {Wang, Kaichen and Zhao, Baijun and Gao, Lu, E-mail: gaolu@jlu.edu.cn},
abstractNote = {Graphical abstract: The influence on the photoluminescent performance due to the electronic structure change in Eu-doped CaTiO{sub 3} of the specific core-level and valence band spectrum via X-ray photoemission spectroscopy were characterized. - Highlights: • Single phase CaTiO{sub 3} and CaTiO{sub 3}: Eu crystals were prepared under mild hydrothermal method. • Crystal structure, doping level and the relations to their luminescent property were discussed. • Charge compensation mechanism was discussed via valance band spectrum by XPS. - Abstract: Charge compensation of on-site Eu 4f–5d transition that determines the luminescent performance was confirmed with valance band spectrum. Influence of photoelectrons from CaTiO{sub 3}: Eu to the corresponding luminescent performance was discussed based on the crystal structure, doping level and the relations to their luminescent property. This paper is important to further optimize the luminescent performance for improving the efficiency and reducing the cost in light emitting diode industry.},
doi = {10.1016/J.MATERRESBULL.2016.01.038},
journal = {Materials Research Bulletin},
number = ,
volume = 78,
place = {United States},
year = 2016,
month = 6
}
  • We present photoemission results with uv and with x rays from a family of pseudobinary compounds obtained by partial substitution of Yb, with Ca or Sc, in the reference compound YbAl{sub 2}. The substitution with Ca gives rise to a decompression and the one with Sc a compression of the lattice. Ultraviolet photoemission shows the perturbation of the electron states due to chemical substitution; Sc introduces a {ital d} character extending up to about 3 eV below the Fermi level. The weights of the Yb{sup 3+} and Yb{sup 2+} multiplets given by x-ray photoemission are compared with the results frommore » x-ray absorption; the two spectroscopies agree in YbAl{sub 2} while the relative weights Yb{sup 3+} versus Yb{sup 2+} from x-ray photoemission are definitely below the x-ray-absorption values in the compounds heavily substituted with Sc; this is interpreted as a photoemission final-state effect connected with the {ital d} character introduced by the substitution.« less
  • The present work report a series of trivalent Europium (Eu{sup 3+}) doped well crystallized perovskite CaTiO{sub 3} phosphors successfully synthesized by chemical co-precipitation method. The crystal structure was confirmed by X-ray diffraction (XRD) which is in good agreement with pure orthorhombic phase with space group Pbnm, and it also indicated that the incorporation of the dopant did not affect the crystal structure. The impact of doping on the photoluminescence performances of the sample has been investigated by emission, excitation, and diffuse reflectance spectra at the room temperature. Photoluminescence spectra of Eu{sup 3+} doped CaTiO{sub 3} nanophosphor revealed the characteristic emissionmore » peak around wavelength 618 nm in the visible region upon the excitation of near-UV light at wavelength 397 nm due to {sup 5}D{sub 0} → {sup 7}F{sub 2} transition in Eu{sup 3+}. It was further proved that the dipole– dipole interactions results in the concentration quenching of Eu{sup 3+} in CaTiO{sub 3}:Eu{sup 3+} nanophosphors. The elemental composition of sample carried out by energy dispersive spectroscopy (EDS). EDS analysis reveals that the Eu{sup 3+} doped successfully into host CaTiO{sub 3}. The experimental result reveals that prepared nanophosphor can be used in the application of solid state lighting devices.« less
  • CaTiO{sub 3} phosphors doped with Eu{sup 3+} and codoped with Mg{sup 2+} were prepared by Solid State Reaction method. The powders were characterized by X-ray diffraction, SEM with EDS, Raman scattering, and photoluminescence spectroscopy. The Crystalline phase and vibrational modes of the phosphors were studied using XRD pattern and Raman Spectrum respectively. The morphological studies of the phosphor samples were carried out using SEM analysis. From PL spectra we have observed two prominent red emission peaks around at 595 nm ({sup 5}D{sub 0}→{sup 7}F{sub 1}), 619 nm ({sup 5}D{sub 0}→{sup 7}F{sub 2}) with the excitation of 399 nm for Eu{supmore » 3+} doped CaTiO{sub 3} powders. The PL intensity of CaTiO{sub 3}:Eu{sup 3+} phosphor is enhanced significantly on codoping with Mg{sup 2+}. The observed enhanced emissions are due to energy transfer from Mg{sup 2+} to Eu{sup 3+}, which is due to radiative recombination. Eu{sup 3+} doped phosphors are well known to be promising materials for electroluminescent devices, optical amplifiers, and lasers.« less
  • Nanoparticles of Eu{sup 3+} doped YPO{sub 4} have been prepared using ethylene glycol (EG). Ethylene diamine tetra acetic acid (EDTA) is used as a complexing agent. X-ray diffraction results show that the nanoparticles are crystalline in tetragonal structure. Based on William-Hall relation, the effective crystallite size and strain developed in lattice are found to be 28 nm and 0.002, respectively. With the addition of EDTA, there is a slight shift towards the lower wavelength in emission peaks. Asymmetric ratio of electric to magnetic dipole transition intensities are found to decrease with addition of EDTA. Emission intensity decreases with EDTA becausemore » of decrease of particle size as well as decrease of number of Eu{sup 3+} activators per unit volume. These materials are dispersible in water, which may have potential biological applications.« less
  • X-ray excited optical luminescence (XEOL) and x-ray absorption near-edge structure in total electron, x-ray fluorescence, and photoluminescence yields at Sn M{sub 5,4}-, O K-, and Sn K-edges have been used to study the luminescence from SnO{sub 2} nanoribbons. The effect of the surface on the luminescence from SnO{sub 2} nanoribbons was studied by preferential excitation of the ions in the near-surface region and at the normal lattice positions, respectively. No noticeable change of luminescence from SnO{sub 2} nanoribbons was observed if the Sn ions in the near-surface region were excited selectively, while the luminescence intensity changes markedly when Sn ormore » O ions at the normal lattice positions were excited across the corresponding edges. Based on the experimental results, we show that the luminescence from SnO{sub 2} nanoribbons is dominated by energy transfer from the excitation of the whole SnO{sub 2} lattice to the surface states. Surface site specificity is not observable due to its low concentration and weak absorption coefficient although the surface plays an important role in the emission as a luminescence center. The energy transfer and site specificity of the XEOL or the lack of the site specificity from a single-phase sample is discussed.« less