Singh, Sunil K.Kumar, KaushalSrivastava, Manish K.Rai, Devendra K.Rai, Shyam B.2025-03-032025-03-03201015394794https://dl.bhu.ac.in/ir/handle/123456789/81950The 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.Articlehttps://doi.org/10.1364/OL.35.001575