Abstract

The effect of an external magnetic field (01T) on the upconversion emission (λexc=976nm) of Gd2O3:Er3+Yb3+ nanocrystalline phosphor has been studied. Optical bistability (hysteresis behavior in the intensity of the optical emission) for different transitions of the Er3+ ion has been observed for a complete cycle of the magnetic field between 0 and 1T. 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

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