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

Lin Luo^1,2,3，Ronghui Liu^1,2，Yuanhong Liu^1,2，Weidong Zhuang^1,2，Yanfeng Li^1,2，Shaowei Qin^1,2

1. National Engineering Research Center for Rare Earth Materials,GRINM Group Co.,Ltd.2. GRIREM Advanced Materials Co.,Ltd3. General Research Institute for Nonferrous Metals

摘 要：A series of non-rare earth Mn⁴⁺-activated strontium aluminate phosphors Sr₄ Al₁₄O₂₅: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 transition² E→⁴ A₂ of Mn⁴⁺ ions.In addition,the crystal field strength parameter（D_q） and Racah parameters（B,C）and energies of states were calculated based on experimental data.Moreover,the luminous intensity of Sr₄ Al_14-xSc_xO₂₅:Mn⁴⁺ is enhanced and increased by 60% compa red with Mn⁴⁺ single incorporated sample at x=0.06.A phenomenon of redshift is observed in the excitation spectrum and discussed systematically.Finally,the mechanism of the positive effects with Sc³⁺ ions incorporated into lattice is discussed in detail.All the results suggest that the Sr₄ Al_13.94Sc_0.06O₂₅:Mn⁴⁺ phosphor will become one of the great candidates for backlight of LCD.

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