npsm 새물리 New Physics : Sae Mulli

pISSN 0374-4914 eISSN 2289-0041
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Research Paper

New Phys.: Sae Mulli 2021; 71: 819-826

Published online October 29, 2021 https://doi.org/10.3938/NPSM.71.819

Copyright © New Physics: Sae Mulli.

Electron Magnetic Resonance Study of Mn-doped Quantum Dot CsPbBr$_{3}$ Inside a Phosphate Glass Matrix

Tae Ho YEOM1*, Hyo Young YEOM2, Pabitra ARYAL3

1Department of Laser and Optical Information Engineering, Cheongju University, Cheongju 28503, Korea

2College of Liberal Arts, Cheongju University, Cheongju 28503, Korea
3Center for Underground Physics, Institute for Basic Science, Daejeon, 34126, Korea

Correspondence to:thyeom@cju.ac.kr

Received: July 21, 2021; Revised: August 29, 2021; Accepted: August 29, 2021

Abstract

Mn$^{2+}$ ion-doped perovskite CsPbBr$_{3}$ quantum dots embedded in glass were synthesized by using the melt-quenching technique. An X- band electron magnetic resonance (EMR) spectrometry, showed two sets of Mn$^{2+}$ EMR spectra in the CsPbBr$_{3}$ quantum dots at room temperature: One originating from isolated Mn$^{2+}$ ions and the other set from Mn$^{2+}$ clusters. As the Mn concentration was increased, the concentration of isolated Mn$^{2+}$ ions decreased, whereas the concentration of Mn$^{2+}$ clusters increased. The spectroscopic splitting parameter ($g$ = 2.011) and the hyperfine constant ($A$ = 9.66 mT) were determined using the effective spin Hamiltonian. The Mn$^{2+}$ ion resides at Pb$^{2+}$ instead of Cs$^{+}$ in CsPbBr$_{3}$ QDs and/or in the fabricated CsPbBr$_{3}$ glass. If the Mn$^{2+}$ ion substitute for Pb$^{2+}$ in the CsPbBr$_{3}$ QDs, the local site symmetry of the Mn$^{2+}$ ion is cubic.

Keywords: EMR, CsPbBr$_3$ quantum dot, Mn$^{2+}$ impurity, Hyper-fine constant, Site location

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