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Achieving Efficient Red-Emitting Sr2Ca1−δLnδWO6:Mn4+ (Ln = La, Gd, Y, Lu, δ = 0.10) Phosphors with Extraordinary Luminescence Thermal Stability for Potential UV-LEDs Application via Facile Ion Substitution in Luminescence-Ignorable Sr2CaWO6:Mn4+
ACS Materials Letters ( IF 9.6 ) Pub Date : 2020-06-04 , DOI: 10.1021/acsmaterialslett.0c00212
Kai Li 1 , Jiaren Du 2 , Dirk Poelman 2 , Henk Vrielinck 3 , Dimitrije Mara 1 , Rik Van Deun 1
Affiliation  

In this work, we adopt a facile rare earth ions Ln3+ (Ln = La, Gd, Y, Lu) substitution strategy to achieve the efficient red luminescence Sr2Ca1−δLnδWO6:Mn4+ (δ = 0.10), which extremely improves the luminescence properties of luminescence-ignorable Sr2CaWO6:Mn4+. It is demonstrated that the substitution of Ln3+ for Ca2+ can stabilize the Mn in tetravalent state, which would like to occupy W6+ site and generate the luminescence. It is also found that the emission profile of original Sr2CaWO6:Mn4+ changes manifestly after different Ln3+ ions substitution, which is mainly attributed to the synergistic effect of lattice distortion, Mn4+ transition 2Eg4A2g and lattice vibration. Most fascinatingly, the Sr2Ca0.9Ln0.1WO6:0.005Mn4+ (SC0.9Ln0.1WO:0.005Mn4+, Ln = La, Gd) show extraordinary luminescence thermal stability, whose integrated emission intensity still maintains about 95% (Gd, 96.8%; La, 94.8%) at 478 K of its original value at room temperature (298 K), much better than those in most reported Mn4+-activated oxide phosphors so far. It is confirmed that the traps may play an important role for this phenomenon. Best of all, this work gives us a facile strategy to achieve efficient Mn4+-activated red-emitting materials with extraordinary luminescence thermal stabilities derived from luminescence-ignorable ones.

中文翻译:

实现有效的红光发射的Sr 2的Ca 1-δ LN δ WO 6:锰4+(Ln为镧,钆,钇,路,δ= 0.10),通过简易离子置换具有非凡的发光热稳定性对潜在的UV-LED的应用荧光粉致发光Sr 2 CaWO 6:Mn 4+

在这项工作中,我们采用一个浅显的稀土离子LN 3+(Ln为镧,钆,Y,Lu)的替代策略,实现高效的红色发光的Sr 2的Ca 1-δ LN δ WO 6:锰4+(δ= 0.10),极大地改善了可发光发光的Sr 2 CaWO 6:Mn 4+的发光性能。结果表明,用Ln 3+代替Ca 2+可以使Mn稳定在四价态,从而希望占据W 6+位并产生发光。还发现原始Sr 2 CaWO 6的发射曲线:Mn 4+在不同的Ln 3+离子取代后发生明显变化,这主要归因于晶格畸变,Mn 4+跃迁2 E g4 A 2g和晶格振动的协同作用。最令人着迷的是Sr 2 Ca 0.9 Ln 0.1 WO 6:0.005Mn 4+(SC 0.9 Ln 0.1 WO:0.005Mn 4+,Ln = La,Gd)表现出非凡的发光热稳定性,在室温(298 K)原始值478 K时,其综合发射强度仍保持约95%(Gd,96.8%; La,94.8%)到目前为止,与大多数报道的Mn 4+活化的氧化物荧光粉相比,荧光粉的含量更高。可以肯定的是,陷阱可能对这种现象起重要作用。最重要的是,这项工作为我们提供了一种简便的策略,以实现具有有效的Mn 4+激活的红色发光材料,该材料具有源自可发光的材料的非凡的发光热稳定性。
更新日期:2020-07-06
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