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Li_2SnO_3 branched nano- and microstructures with intense and broadband white-light emission

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García Tecedor, Miguel and Bartolomé Vílchez, Javier and Maestre Varea, David and Cremades Rodríguez, Ana Isabel and Trampert, A. (2019) Li_2SnO_3 branched nano- and microstructures with intense and broadband white-light emission. Nano research, 12 (2). pp. 441-448. ISSN 1998-0124

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Official URL: http://dx.doi.org/10.1007/s12274-018-2236-0


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Abstract

Exploiting the synergy between microstructure, morphology and dimensions by suitable nanomaterial engineering, can effectively upgrade the physical properties and material performances. Li_2SnO_3 elongated nano-and microstructures in form of belts, wires, rods and branched structures have been fabricated by a vapor-solid method at temperatures ranging from 700 to 900 degrees C using metallic Sn and Li_2CO_3 as precursors. The achievement of these new morphologies can face challenging applications for Li_2SnO_3, not only in the field of energy storage, but also as building blocks in optoelectronic devices. The micro-and nanostructures grown at 700 and 800 degrees C correspond to monoclinic Li2SnO3, while at 900 degrees C complex Li_2SnO_3/SnO_2 core-shell microstructures are grown, as confirmed by X-ray diffraction and Raman spectroscopy. Transmission electron microscopy reveals structural disorder related to stacking faults in some of the branched structures, which is associated with the presence of the low-temperature phase of Li_2SnO_3. The luminescent response of these structures is dominated by intense emissions at 2, 2.5 and 3 eV, almost completely covering the whole range of the visible light spectrum. As a result, white-light emission is obtained without the need of phosphors or complex quantum well heterostructures. Enhanced functionality in applications such as in light-emitting devices could be exploited based on the high luminescence intensity observed in some of the analysed Li_2SnO_3 structures.


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© 2019 Tsinghua University Press and Springer-Verlag Berlin Heidelberg
This work was supported by MINECO/FEDER/M-ERA.Net Cofund (Project MAT 2015-65274R, Project MAT 2016-81720-REDC and PCIN-2017-106). The authors are grateful to the spectromicroscopy beamline staff for useful advice on photoelectron spectroscopy measurements at the Elettra Synchrotron in Trieste. M. G. T. also wants to thank Mr. F. del Prado for his useful help on the analysis of the CL and PL results and Dr. G.C. Vasquez for his help with Vesta software.

Uncontrolled Keywords:Microwave dielectric-properties; Luminescence properties; Emitting-diodes; Anode material; Tin oxide; Lithium; Electrode; Ceramics; Phosphor; Alloy
Subjects:Sciences > Physics > Materials
Sciences > Physics > Solid state physics
ID Code:51710
Deposited On:07 Mar 2019 16:19
Last Modified:07 Mar 2019 16:19

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