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Electron–Phonon Coupling Assisted Emission in Single Magnetic La0.67Ca0.33MnO3 Domains of Thin Nanoplates

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A chemical method with small polymer templates is explored to obtain single magnetic domain La0.67Ca0.33MnO3 particles of thin nanoplates (25–35 nm thickness). The sample is light-emitting (480–800 nm) in multiple bands with two prominent bandgroups in the 570 nm green and 762 nm red emissions. The green emission consists of four bands 555.1, 565.7, 573.4, and 584.7 nm in the O2−-2p → Mn3+/Mn4+-3d interband electronic transitions. Two excited-electronic levels G1 (565.7 nm) and G2 (555.1 nm), which are exchange coupled via a phonon level v*2 (678 cm−1), exhibit the four bands in the transitions to the ground state G0 and a phonon level v1 (575 cm−1). The bands v1 and v2 are well-resolved in the IR spectrum. A similar phonon assisted Mn3+ → Mn4+ charge transfer transition results in the red emission. Both the green and red bandgroups appear in a common excitation over 350–450 nm from a xenon source. Evidently, as proposed with a model energy level diagram, the electron–phonon coupling governs a multiple light-emission in this example of the single domain particles. Otherwise, such specific ceramics of half-metallic ferromagnets hardly allows a light-emission at room temperature.
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Document Type: Research Article

Publication date: 2010-04-01

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  • Journal for Nanoscience and Nanotechnology (JNN) is an international and multidisciplinary peer-reviewed journal with a wide-ranging coverage, consolidating research activities in all areas of nanoscience and nanotechnology into a single and unique reference source. JNN is the first cross-disciplinary journal to publish original full research articles, rapid communications of important new scientific and technological findings, timely state-of-the-art reviews with author's photo and short biography, and current research news encompassing the fundamental and applied research in all disciplines of science, engineering and medicine.
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