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Issue 18, 2015
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Li2MnO3: a rare red-coloured manganese(iv) oxide exhibiting tunable red–yellow–green emission

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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 ∼610 nm and a transparent region between ∼610 and ∼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.

Graphical abstract: Li2MnO3: a rare red-coloured manganese(iv) oxide exhibiting tunable red–yellow–green emission

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Article information


Submitted
05 Mar 2015
Accepted
04 Apr 2015
First published
07 Apr 2015

J. Mater. Chem. C, 2015,3, 4794-4800
Article type
Paper

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

S. Tamilarasan, S. Laha, S. Natarajan and J. Gopalakrishnan, J. Mater. Chem. C, 2015, 3, 4794
DOI: 10.1039/C5TC00616C

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