Emergence of Multicolor Photoluminescence in La0.67Sr0.33MnO3 Nanoparticles

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• 作者：Anupam Giri ; Nirmal Goswami ; M. S. Bootharaju ; Paulrajpillai Lourdu Xavier ; Robin John ; Nguyen T. K. Thanh ; Thalappil Pradeep ; Barnali Ghosh ; A. K. Raychaudhuri ; Samir Kumar Pal
• 刊名：The Journal of Physical Chemistry C
• 出版年：2012
• 出版时间：December 6, 2012
• 年：2012
• 卷：116
• 期：48
• 页码：25623-25629
• 全文大小：493K
• 年卷期：v.116,no.48(December 6, 2012)
• ISSN：1932-7455

文摘

Herein, we report the emergence of multicolor photoluminescence in a mixed-valence manganite nanoparticle La_0.67Sr_0.33MnO₃ (LSMO NP) achieved through electronic structural modification of the nanoparticles upon functionalization with a biocompatible organic ligand, sodium tartrate. From UV鈥搗is 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 Mn^3+/4+ of the NPs), and d鈥揹 transitions involving Jahn鈥揟eller sensitive Mn³⁺ ions in the NPs plays the central role behind the origin of multiple photoluminescence from the ligand functionalized LSMO NPs.