Tunable emission, energy transfer and thermal stability of Ce3+ , Tb3+ co-doped Na2BaCa(PO4)2 phosphors

A series of single Ce3+ doped and Ce3+ and Tb3+ co-doped Na2BaCa(PO4)(2) (NBCP) phosphors was synthesized by conventional solid-stated reaction method. The crystal structure, luminescence properties, thermal stability and energy transfer were carefully investigated. Ce3+ is inferred to substitute the Ba2+ site in NBCP lattice. The color-tunable emission from blue to green is observed by adjusting Tb3+ concentration among NBCP:0.03Ce(3+),yTb(3+) phosphors. The energy transfer behavior from Ce3+ to Tb3+ ions is both illustrated by co-doped PL spectra and decay curves. The energy transfer efficiency is as high as 91.5%. The mechanism of energy transfer is resonance type of dipole-dipole transition. In this work, the optimal phosphor exhibits the excellent thermal stability which keeps at 94.9% of that initial value at room temperature when temperature reaches to 150 degrees C. The Ce3+ and Tb3+ co-doped NBCP phosphor is a promising candidate for the application in the general lighting and display fields. (c) 2021 Chinese Society of Rare Earths. Published by Elsevier B.V. All rights reserved.

Automated summary

This study synthesized a series of Ce3+ doped and Ce3+ and Tb3+ co-doped Na2BaCa(PO4)2 (NBCP) phosphors by conventional solid-stated reaction method. The color-tunable emission from blue to green was achieved by adjusting the Tb3+ concentration. The energy transfer efficiency from Ce3+ to Tb3+ ions was found to be as high as 91.5%. The optimal phosphor exhibited excellent thermal stability and has potential applications in general lighting and display fields.