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Title: Synthesis and luminescence enhancement of Eu{sup 3+}, Sm{sup 3+} co-doped Li{sub 1.11}Ta{sub 0.89}Ti{sub 0.11}O{sub 3} phosphor

Graphical abstract: Enhancement of red emission intensity and internal- and external-quantum efficiencies by co-doping of Eu{sup 3+} and Sm{sup 3+} ion in Li{sub 1.11}Ta{sub 0.89}Ti{sub 0.11}O{sub 3} phosphor. - Abstract: Phosphors based on the Li{sub 1+x}Ta{sub 1−x}Ti{sub x}O{sub 3} solid solutions (0.05 ≤ x ≤ 0.25) as host materials were investigated. The optimal composition of the host for red-light emitting phosphor was found to be Li{sub 1.11}Ta{sub 0.89}Ti{sub 0.11}O{sub 3} (x = 0.11) when activated with Eu{sup 3+}. In this work, in order to further enhance the emission intensity, a series of Eu{sup 3+}- and Sm{sup 3+}-doped Li{sub 1.11}Ta{sub 0.89}Ti{sub 0.11}O{sub 3} phosphors was synthesized by solid-state reaction. The phosphor doped with 2.5 wt% Eu{sub 2}O{sub 3} and 0.1 wt% Sm{sub 2}O{sub 3} showed the highly efficient red-light emission upon excitation at 399 nm, with the internal quantum efficiency being 98%. Its PL intensity was ca. 1.4 times higher than that of the 2.5 wt% Eu{sup 3+}-doped Li{sub 1.11}Ta{sub 0.89}Ti{sub 0.11}O{sub 3} phosphor, indicating that the small amount of Sm{sup 3+} acted as an effective sensitizer.
Authors:
 [1] ;  [1] ;  [2] ;  [3]
  1. Department of Environmental and Life Sciences, Toyohashi University of Technology, Toyohashi 441-8580 (Japan)
  2. Department of Materials Science and Engineering, Nagoya Institute of Technology, Nagoya 466-8555 (Japan)
  3. Central Research Institute, Denki Kagaku Kogyo K.K., Machida 194-8560 (Japan)
Publication Date:
OSTI Identifier:
22420716
Resource Type:
Journal Article
Resource Relation:
Journal Name: Materials Research Bulletin; Journal Volume: 60; Other Information: Copyright (c) 2014 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; DOPED MATERIALS; EUROPIUM IONS; EUROPIUM OXIDES; EXCITATION; LITHIUM TITANATES; LUMINESCENCE; PHOSPHORS; QUANTUM EFFICIENCY; SAMARIUM IONS; SAMARIUM OXIDES; SENSITIZERS; SOLID SOLUTIONS; SOLIDS; SYNTHESIS; TANTALUM COMPOUNDS; VISIBLE RADIATION; X-RAY DIFFRACTION