Li2MnO3: a rare red-coloured manganese(IV) oxide exhibiting tunable red-yellow-green emission

Tamilarasan, S and Laha, Sourav and Natarajan, S and Gopalakrishnan, J (2015) Li2MnO3: a rare red-coloured manganese(IV) oxide exhibiting tunable red-yellow-green emission. In: JOURNAL OF MATERIALS CHEMISTRY C, 3 (18). pp. 4794-4800.

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Abstract

An experimental assessment of Li2MnO3 has been conducted, in conjunction with related Mn(IV) oxides, to investigate its red colour and photoluminescence. Optical absorption spectra revealed strong band gap absorption, with a sharp edge at similar to 610 nm and a transparent region between similar to 610 and similar to 650 nm, giving rise to the red colour of this compound. Octahedral Mn(IV) ligand field transitions have been observed in the excitation spectra of Li2MnO3, corresponding both to Mn(IV) at ideal sites and displaced in Li sites in the rock salt-based layered structure of Li2MnO3. Optical excitation at ligand field transition energies produces tunable emission in the red-yellow-green region, rendering Li2MnO3 a unique Mn(IV) oxide. The honeycomb-ordered LiMn6] units in its structure are probably the origin of both the absorption and the photoluminescent properties of Li2MnO3.

Item Type:	Journal Article
Publication:	JOURNAL OF MATERIALS CHEMISTRY C
Publisher:	ROYAL SOC CHEMISTRY
Additional Information:	Copy right for this article belongs to the ROYAL SOC CHEMISTRY, THOMAS GRAHAM HOUSE, SCIENCE PARK, MILTON RD, CAMBRIDGE CB4 0WF, CAMBS, ENGLAND
Keywords:	LITHIUM-ION BATTERIES; CATHODE MATERIALS; ELECTRONIC-STRUCTURE; OPTICAL-PROPERTIES; SOLID-SOLUTIONS; PIGMENTS; PHOSPHOR; LUMINESCENCE; DIFFRACTION; MN4+
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	29 May 2015 06:38
Last Modified:	29 May 2015 06:38
URI:	http://eprints.iisc.ac.in/id/eprint/51619

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