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Correlations between mechanical and photoluminescence properties in Eu doped sodium bismuth titanate

Prusty, Rajesh K and Kuruva, Praveena and Ramamurty, U and Thomas, Tiju (2013) Correlations between mechanical and photoluminescence properties in Eu doped sodium bismuth titanate. In: SOLID STATE COMMUNICATIONS, 173 . pp. 38-41.

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Official URL: http://dx.doi.org/10.1016/j.ssc.2013.09.002


Nanoindentation technique is utilized to examine mechanical property variation in Eu doped Na0.5Bi0.5 TiO3 (NBT). Doping levels of Eu in NBT is systematically varied. Dilute doping results in a linear reduction in both modulus and hardness. At higher concentrations, a recovery of the mechanical properties (to undoped NBT values) is observed. These experimental trends mirror variations in the optical emission intensities with Eu concentration. Observed trends are rationalized on the basis of a model, which hypothesizes phase segregation beyond a critical Eu doping level. Such segregation leads to the formation of pure NBT, nano-Eu saturated NBT, and nano-mixed Eu oxides in the microstructure. Pure NBT is optically inactive, while saturated Eu:NBT is a much better emitter when compared to europium oxide. Hence beyond the critical concentration, luminescence signal comes primarily from the saturated Eu:NBT phase. The model presented is supported by nanoindentation, and spectroscopic results. (C) 2013 Elsevier Ltd. All rights reserved.

Item Type: Journal Article
Additional Information: Copyright for this article belongs to the PERGAMON-ELSEVIER SCIENCE LTD, ENGLAND
Keywords: Perosvkite phosphor; Photoluminescence; Phase segregation; Nanoindentation
Department/Centre: Division of Chemical Sciences > Materials Research Centre
Date Deposited: 13 Mar 2014 07:28
Last Modified: 13 Mar 2014 07:28
URI: http://eprints.iisc.ac.in/id/eprint/48571

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