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Enhanced luminescence performances of Mn4+-activated Sr4Al14O25 red phosphors by doping with Sc3+ ions
Journal of Rare Earths ( IF 4.9 ) Pub Date : 2020-07-01 , DOI: 10.1016/j.jre.2020.06.008
Lin Luo , Ronghui Liu , Yuanhong Liu , Weidong Zhuang , Yanfeng Li , Shaowei Qin

Abstract A series of non-rare earth Mn4+‐activated strontium aluminate phosphor Sr4Al14O25: Mn4+ co-doping with Sc3+ ions are successfully synthesized with a high-temperature solid-state reaction method. XRD result reveal 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 are calculated based on experimental data. Moreover, the luminous intensity of Sr4Al14-xScxO25:Mn4+ is enhanced and increase by 60% compared with Mn4+ single incorporated sample at x = 0.06. A phenomenon of redshift is observed in the excitation spectrum and have been discussed systematically. Finally, the mechanism of the positive effects with Sc3+ ions incorporated into lattice has been 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.

中文翻译:

通过掺杂 Sc3+ 离子增强 Mn4+ 激活的 Sr4Al14O25 红色荧光粉的发光性能

摘要 采用高温固相反应法成功合成了一系列非稀土Mn4+活化的铝酸锶荧光粉Sr4Al14O25:Mn4+与Sc3+离子共掺杂。XRD 结果表明,没有引入额外的相,而是随着 Sc3+ 离子的掺入而扩展了晶格。激发和发射光谱测量表明,合成的荧光粉可以被近紫外光和蓝光有效激发,并且可以获得以 652 nm 为中心、半高全宽 (FWHM) 较窄的深红色发射,这归因于Mn4+ 离子的跃迁 2E→4A2。此外,根据实验数据计算了晶体场强参数(Dq)和Racah参数(B,C)和态能。此外,Sr4Al14-xScxO25 的发光强度:在 x = 0.06 时,与 Mn4+ 单一掺入样品相比,Mn4+ 增强并增加了 60%。在激发光谱中观察到红移现象,并已进行系统讨论。最后,详细讨论了 Sc3+ 离子掺入晶格的积极作用机制。所有结果表明,Sr4Al13.94Sc0.06O25:Mn4+荧光粉将成为LCD背光的重要候选材料之一。
更新日期:2020-07-01
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