Publication: Magnetic-field-induced Optical bistability in multifunctional Gd 2O3: Er3+/Yb3+ upconversion nanophosphor
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Date
2010
Journal Title
Optics Letters
Journal ISSN
Volume Title
Publisher
Abstract
The effect of an external magnetic field (0-1 T) on the upconversion emission (λexe,=976 nm) of Gd2O3 : Ers+/Yb8+ nanocrystalline phosphor has been studied. Optical bistability (hysteresis behavior in the intensity of the optical emission) for different transitions of the Er8+ ion has been observed for a complete cycle of the magnetic field between 0 and 1 T. The phosphor shows paramagnetic behavior, consistent with the presence of Gd3+ ions, at room temperature. Interaction between induced magnetization in the Gd2O3 host and the intrinsic magnetic moment of the nanosized clusters of Er3+ and Yb3+ ion pairs is proposed to be responsible for the hysteresis behavior. © 2010 Optical Society of America.