Achieving highly efficient far-red emission from luminescence-ignorable Ca2MgTeO6:Mn4+ to Ca(2-z)Ln(z)MgTe(1-y)W(y)O(6):Mn4+ (Ln = La, Y, Gd) phosphors via solid solution and impurity doping strategies
Achieving highly efficient far-red emission from luminescence-ignorable Ca2MgTeO6:Mn4+ to Ca(2-z)Ln(z)MgTe(1-y)W(y)O(6):Mn4+ (Ln = La, Y, Gd) phosphors via solid solution and impurity doping strategies
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从可忽略发光的 Ca2MgTeO6:Mn4 到 Ca(2-z)Ln(z)MgTe(1-y)W(y)O(6):Mn4 (Ln = La, Y, Gd) 实现高效远红发射
DOI：
10.1016/j.ceramint.2021.08.216
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发表时间：
2021
影响因子：
5.2
通讯作者：
Ruijin Yu
中科院分区：
文献类型：
--
作者：
Shanshan Chen;Jing Gao;Wen Shi;Xue Geng;Yuan Wang;Yang Qiu;Guangliang Lu;Dan Zhang;Jin Zhao;Bin Deng;Ruijin Yu
成功地合成了双钙钛矿型结构的Mn4+掺杂Ca2MgTeO6(CMTO)远红发光材料。在近紫外光(n-UV，300 nm)激发下，由于Mn4+离子的2Eg→4A2g跃迁，所制备的荧光粉在700nm处表现出远红光。优化了CMTO：xMn4+样品的掺杂浓度为0.8%。浓度猝灭的相关机制被证明为偶极-偶极相互作用。此外，还采用了固溶体和杂质掺杂策略来改善发光可以忽略的CMTO：Mn4+荧光粉的远红光发射。通过上述两种方法合成了系列Ca2MgTe(1−y)WyO6：0.8nmo1%Mn4+(y=0.10~100mmol%)固溶体和Ca2−ZLnzMgTe0.6W0.4O6：Mn4+(LnLa，Y，Gd，z=0.10mmol%)系列荧光粉。优化的Ca1.9Gd0.1MgTe0.6W0.4O6：Mn4+荧光粉的发光强度是CMTO：Mn4+荧光粉的13.7倍，是商品红色荧光粉K2SiF6：Mn4+的2.51倍。值得注意的是，与大多数Mn4+掺杂的荧光粉相比，CMTO：Mn4+和Ca1.9Gd0.1MgTe0.6W0.4O6：Mn4+的荧光粉都具有显著的热稳定性。最后，将高效的Ca1.9Gd0.1MgTe0.6W0.4O6：Mn4+荧光粉成功地应用于温白光二极管(w-LED)的制备。这种双线工作策略在优化掺杂Mn4+氧化物荧光粉的发光方面显示了巨大的潜力。
The Mn4+-doped Ca2MgTeO6 (CMTO) far-red emitting phosphors with double perovskite-type structure were successfully synthesized. Upon near-ultraviolet (n-UV, 300 nm) light excitation, the as-prepared phosphors showed far-red light at 700 nm attributed to the2Eg→4A2gtransition of Mn4+ion. The doping concentration of the CMTO:xMn4+samples was optimized to be 0.8 mol%. The relevant mechanism of concentration quenching was demonstrated as the dipole-dipole interaction. Furthermore, solid solution and impurity doping strategies were adopted to improve the far-red emission of the luminescence-ignorable CMTO:Mn4+phosphor. Series of Ca2MgTe(1−y)WyO6:0.8 mol%Mn4+(y= 0–100 mol%) solid solution and Ca2−zLnzMgTe0.6W0.4O6:Mn4+(Ln = La, Y, and Gd,z= 10 mol%) phosphors were synthesized through the above two strategies. The luminescence intensity of the optimal Ca1.9Gd0.1MgTe0.6W0.4O6:Mn4+phosphor was 13.7 times that of the CMTO:Mn4+phosphor and 2.51 times that of red commercial phosphor K2SiF6:Mn4+. Notably, both CMTO:Mn4+and Ca1.9Gd0.1MgTe0.6W0.4O6:Mn4+phosphors exhibited remarkable thermal stability compared with most Mn4+-doped phosphors. Finally, the highly efficient Ca1.9Gd0.1MgTe0.6W0.4O6:Mn4+phosphor was successfully applied in fabricating the warm white light diode (w-LED). This working along both lines strategy exhibited great potential for luminescence optimization of Mn4+-doped oxide phosphors.