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High-temperature ferromagnetic semiconductor with a field-tunable green fluorescent effect

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Hu,  Zhiwei
Zhiwei Hu, Physics of Correlated Matter, Max Planck Institute for Chemical Physics of Solids, Max Planck Society;

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Citation

Zhou, B., Zhao, Q., Liu, Z., Shen, X., Ye, X., Shi, J., et al. (2020). High-temperature ferromagnetic semiconductor with a field-tunable green fluorescent effect. NPG Asia Materials, 12(1): 69, pp. 1-6. doi:10.1038/s41427-020-00250-3.


Cite as: http://hdl.handle.net/21.11116/0000-0007-5D49-0
Abstract
Ferromagnetic semiconductors with luminescent effects provide a unique platform for studying magneto-electric-optical multifunctional devices. However, little is known about such materials with spin ordering well above room temperature. By using a unique high-pressure annealing method, a Cr and Fe disordered perovskite oxide SrCr0.5Fe0.5O2.875 (SCFO) with a simple cubic structure was prepared. Magnetic measurements demonstrated the ferromagnetic behavior with a spin ordering temperature as high as 600 K. In contrast to metallic SrCrO3 and SrFeO3, SCFO, with a moderate oxygen deficiency, is a direct bandgap semiconductor with an energy gap of 2.28 eV, which is within the visible light region. As a consequence, SCFO displays a green fluorescent effect arising from the d–p bonding and anti-bonding states. Moreover, the photoluminescence intensity can be tuned by a magnetic field. This work opens up a new avenue for research on room-temperature multifunctional materials with coupled magnetic, electrical, and optical performance. © 2020, The Author(s).