Emergence of multicolor photoluminescence in La0.67Sr0.33MnO3 nanoparticles
Date
2012
Authors
Giri, A.
Goswami, N.
Bootharaju, M.S.
Xavier, P.L.
John, R.
Thanh, N.T.K.
Pradeep, T.
Ghosh, B.
Raychaudhuri, A.K.
Pal, S.K.
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Journal article
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Journal of Physical Chemistry C, 2012; 116(48):25623-25629
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Abstract
Herein, we report the emergence of multicolor photoluminescence in a mixed-valence manganite nanoparticle La0.67Sr0.33MnO3 (LSMO NP) achieved through electronic structural modification of the nanoparticles upon functionalization with a biocompatible organic ligand, sodium tartrate.
From UV-vis absorption, X-ray photoelectron spectroscopy (XPS), time-resolved photoluminescence study, and Raman spectroscopic measurements, it is revealed that ligand-to-metal charge transfer transitions from highest occupied molecular orbital (HOMO, centered in tartrate ligand) to lowest unoccupied molecular orbital (LUMO, centered in Mn3+/4+ of the NPs), and d-d transitions involving Jahn-Teller sensitive Mn3+ ions in the NPs plays the central role behind the origin of multiple photoluminescence from the ligand functionalized LSMO NPs.
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Copyright 2012 American Chemical Society