Abstract
The effect of an external magnetic field on the upconversion emission of nanocrystalline phosphor has been studied. Optical bistability (hysteresis behavior in the intensity of the optical emission) for different transitions of the ion has been observed for a complete cycle of the magnetic field between 0 and . The phosphor shows paramagnetic behavior, consistent with the presence of ions, at room temperature. Interaction between induced magnetization in the host and the intrinsic magnetic moment of the nanosized clusters of and ion pairs is proposed to be responsible for the hysteresis behavior.
© 2010 Optical Society of America
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