Synthesis and properties study of new rare earth sodium borates Eu3+-doped Na3Y(BO3)2

The samples of ultraviolet (UV)-excited Eu³⁺-doped Na₃Y(BO₃)₂ phosphor with different reaction temperatures and various concentrations of Eu³⁺ ions content are synthesised and their photoluminescence (PL) properties are investigated. It is found that the optimal reaction temperature and Eu³⁺-doped concentration are 800°C and 12.5°, respectively. The phosphor not only has stronger UV PL intensity but also shows excellent chromaticity and broader range of characteristic emission wavelength. Furthermore, a new phenomenon is observed. By altering the reaction temperatures, the peak positions of the highest intensity are divided into two types, which is due to the competition between two kinds of emission, resulting from the split of ⁵D₀ level.