Significant enhancement of blue photoluminescence intensity of Dy3+ modified Sr6Ca4(PO4)6F2∶Eu2+ phosphors

• 作者: Haojun Qian Chenli Fan Kaixin Song Weitao Su Huanping Wang Qingming Huang
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2021,（8）
• 所属期刊栏目: SPECTROSCOPY,LUMINESCENCE AND PHOSPHORS
• 页码范围: 897-904
• 页数: 8页
• 语种: 英文

摘要

Blue-emitting phosphors Sr6Ca4(PO4)6F2∶Eu2+ (SCPF∶Eu2+),Sr6Ca4(PO4)6F2∶Eu2+,Dy3+ (SCPF∶Eu2+,Dy3+)and Sr6Ca4(PO4)6F2∶Eu2+,Dy3+,Si4+ (SCPF∶Eu2+,Dy3+,Si4+) with apatite structure were successfully syn-thesized by traditional solid-state reaction under reducing atmosphere.Eu2+,Dy3+ and Si4+ ions occupy the corresponding sites of Sr2+,Ca2+ and p5+.Strong broad blue photoluminescence band is exhibited in SCPF∶Eu2+,Dy3+ phosphor ranging from 400 to 550 nm centered at 455 nm and Dy3+ ions are vital in creating traps.Emission intensity of Eu2+,Dy3+ co-doped SCPF∶0.02Eu2+,0.02Dy3+ is about 1.8 times that of SCPF∶0.02Eu2+ and electron trap centers serve as energy transporting media.To further elucidate the formation and effect of the specific defect on the luminescence of SCPF∶0.02Eu2+,0.02Dy3+ phosphor,the thermoluminescence properties,decay curves and thermal stability studies were performed while the Si4+-P5+ charge compensated phosphor SCPF∶0.02Eu2+,0.02Dy3+,0.02Si4+ was prepared as a contrast.All the results of present work indicate that Dy3+ co-doping can obviously enhance photoluminescence intensity of SCPF∶0.02Eu2+ by the electron traps generated by non-equivalence replacement of Dy3+-Ca2+.