Enhanced luminescence performances of Mn4+-activated Sr4Al14O25 red phosphors by doping with Sc3+ions

• 作者: Lin Luo Ronghui Liu Yuanhong Liu Weidong Zhuang Yanfeng Li Shaowei Qin
• 来源期刊: 稀土学报（英文版）
• 年，卷（期）: 2021,（4）
• 所属期刊栏目: SPECTROSCOPY, LUMINESCENCE AND PHOSPHORS
• 页码范围: 380-385
• 页数: 6页
• 语种: 英文

摘要

A series of non-rare earth Mn4+-activated strontium aluminate phosphors Sr4Al14O25:Mn4+co-doped with Sc3+ions were successfully synthesized by a high-temperature solid-state reaction method.XRD result reveals that there is no introduction of additional phase but expansion of lattice with incorporation of Sc3+ions.Excitation and emission spectrum measurement shows that the synthesized phosphors can be efficiently excited by near-ultraviolet and blue light,and a deep red emission centered at 652 nm with a narrow full width at half maximum(FWHM)can be obtained,which is attributed to the transition 2E→4A2 of Mn4+ions.In addition,the crystal field strength parameter(Dq)and Racah parameters(B,C)and energies of states were calculated based on experimental data.Moreover,the luminous intensity of Sr4Al14-xScxO25:Mn4+is enhanced and increased by 60％compared with Mn4+single incorporated sample at x = 0.06.A phenomenon of redshift is observed in the excitation spectrum and discussed systemat-ically.Finally,the mechanism of the positive effects with Sc3+ions incorporated into lattice is discussed in detail.All the results suggest that the Sr4Al13.94Sc0.06O25:Mn4+phosphor will become one of the great candidates for backlight of LCD.