Well-Performed Green Phosphor BaY₄Si₅O₁₇:Ce³⁺,Tb³⁺ with High Quantum Efficiency and Thermal Stability

Abstract

For Tb 3+ -doped green phosphors, the energy transfer from Ce 3+ to Tb 3+ can largely enhance the absorption of excitation; however, obtaining phosphors that exhibit both high quantum efficiency and thermal stability continues to pose a significant challenge. Herein, we established a paradigm to achieve novel silicate BaY 4 Si 5 O 17 (BYSO):Ce 3+ ,Tb 3+ . The near-ultraviolet light efficiently excites the BYSO:Ce 3+ material, causing it to emit light at a wavelength of 408 nm. The photoluminescence of BYSO:0.12Ce 3+ exhibits a relatively small Stokes shift and a thermal stability of 89.8% of the 303 K emission intensity at 423 K (89.8%@423 K). The energy transfer (ET) from Ce 3+ to Tb 3+ ions can be readily constructed in BYSO:Ce 3+ ,Tb 3+ utilizing the overlap between the Ce 3+ emission and the Tb 3+ excitation. The ET efficiency from the Ce 3+ to Tb 3+ ions reached 83.8% at y = 1.2 and a maximum of 94.6%. Finally, the optimized phosphor BYSO:0.12Ce 3+ ,1.2Tb 3+ had an internal quantum efficiency of 94.4% and had excellent thermal stability (96.1%@423 K). Our work pointed out the avenue to novel green phosphors with high efficiency and thermal stability by choosing appropriate host and construct efficient ET.