Fig b shows the unit cell structure of

In recent years, much research effort has been directed towards the synthesis of rare-earth (RE3+) doped functional materials since they can be used as highly efficient phosphors, catalysts, and optics materials by virtue of their unique optical, electronic, and chemical properties [1], [2], [3] and [4]. For applications involving NUV excitation (300–400 nm) for the generation of a variety of display panels, Tb3+ ion is a well-known activator that effectively emits green light in diverse host lattices. However, the intensities of the Tb3+ Volasertib peaks in the NUV region are very weak and their widths are very narrow due to the strictly forbidden 4f–4f transitions. This severely limits its performance under NUV excitation [5] and [6]. One of the strategies to solve the above problem is using Ce3+ as a sensitizer because it has a strong excitation band originating from allowed 4f–5d transitions, which could efficiently absorb the NUV light and transfer the excitation energy to Tb3+, then result in strong sensitized green emission [7]. With this strategy, green phosphors with good luminescent properties, such as Sr2B2O5: Ce3+, Tb3+ [8], La6Ba4(SiO4)6F2: Ce3+, Tb3+ [9] and BaAl2B2O7: Ce3+,Tb3+ [10] have been synthesized.