期刊
JOURNAL OF PHYSICAL CHEMISTRY C
卷 116, 期 48, 页码 25623-25629出版社
AMER CHEMICAL SOC
DOI: 10.1021/jp308606a
关键词
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资金
- UGC, India
- CSIR, India
- DST [SR/SO/BB-15/2007]
- DST, India as UNANST-II
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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