In this work, a new strategy to enhance upconversion emission has been realized for the first time, based on β-NaGdF4:Yb3+, Er3+nanocrystals (UCNC) using tridoping with magnesium (Mg2+) ions. X-ray diffraction (XRD) and inductively coupled plasma-atomic emission spectroscopy data indicated successful incorporation of the Mg2+ions in β-NaGdF4:Yb3+, Er3+. The effect of the Mg2+tridopant on the crystal structure, upconversion luminescence, and paramagnetization in β-NaGdF4:Yb3+, Er3+was investigated in detail. The red, green and violet emission intensities were clearly enhanced and...