Multicolored luminescence in double perovskite Gd2ZnTiO6 phosphors with Tb3+/Eu3+ codoping and energy transfer

Multicolor phosphors are crucial components in various applications such as screen displays, lighting fixtures, and color imaging technologies. Despite their widespread use, they still encounter some obstacles in multicolored luminescence. Here, we synthesized a series of Gd 2 ZnTiO 6 phosphors doped with Tb 3+ and Eu 3+ using a high-temperature solid-state reaction method. By employing Reisfeld's approximation theory and Dexter's multipolar interaction theory, we analyzed the energy transfer mechanism from Tb 3+ to Eu 3+ . Our findings indicate that the Tb 3+ to Eu 3+ energy transfer is facilitated by quadrupole-quadrupole interactions. Additionally, we assessed the thermal stability of Gd 2 ZnTiO 6 :Tb 3+ , Eu 3+ using temperature-variable emission spectroscopy across a temperature range of 303–463 K. The Gd 2 ZnTiO 6 phosphors exhibited polychromatic luminescence ranging from green (0.3632, 0.61033) to red (0.6521, 0.3481) under 381 nm excitation by adjusting the content of Eu 3+ and Tb 3+ . Consequently, the Gd 2 ZnTiO 6 :Tb 3+ , Eu 3+ phosphors exhibit excellent luminescence performance coupled with remarkable thermal stability, offering a valuable reference for the advancement of novel and robust luminescent materials.