Er3+–doped 0.94KNN–0.06Ca(Bi0.5Nb0.5)O3: a fluorescent transparent ceramic with optoelectronic multi-functionality

In this work, 0.94(K 0.5 Na 0.5 )NbO 3 –0.06Ca(Bi 0.5 Nb 0.5 )O 3 – x wt%Er 3+ ( x = 0, 0.1, 0.2, 0.3, 0.4) fluorescent transparent ceramics were prepared using traditional solid-phase method. The ceramics are of pseudo-cubic phase, and the average grain size of ceramic reaches the nanometer level. The results show that when x = 0.1, high transmittance of 74.85 and 77.10% are achieved at 780 nm (visible region) and 1100 nm (near-infrared region) respectively. Meanwhile, the ceramic samples have good up-conversion luminescence performance, with green emission at 530 and 550 nm, and red emission at 660 nm. In addition, the maximum dielectric constant of 1030 is obtained at x = 0.3. In this paper, a highly transparent, versatile, and environmentally friendly ceramic was designed. It provides a useful reference for the development of transparent memory devices, transfer capacitors, or sensors.