Enhancing the orange luminescence behavior of the Li+ co-doped Ca2Ti2O6: Sm3+transparent glass-ceramic

The Sm ³⁺ doped transparent glass-ceramics were prepared by the melt crystallization method. Using the device of X-ray diffraction (XRD) can confirm Ca ₂Ti ₂O ₆ nanocrystals were formed among the precursor glass matrix. Under the optimum heat treatment condition (680 °C/90 min), the average grain size in the glass-ceramic is about 103 nm, and the light transmittance in the visible region can reach 78%. Under 402 nm excitation, the emission spectra show strong emission peaks at 564 nm, 600 nm and 647 nm, corresponding to the ⁴G _5/2→ ⁶H _J ( J = 5/2, 7/2, 9/2) characteristic transitions of Sm ³⁺. The optimal doping concentration of Sm ³⁺ is 0.5%, and the concentration quenching caused by exchange interaction will occur if it exceeds this value. The introduction of Li ⁺ into glass-ceramics will not change the crystal phase and can enhance the luminescent intensity. The chromaticity coordinates of 4%Li ⁺-0.5%Sm ³⁺ co-doped glass-ceramic are located in orange region (0.5506, 0.4456), and the color purity can reach 95.4%. The results show that the glass-ceramics have potential applications in solid-state color rendering.