Boosting phonon-induced luminescence in red fluoride phosphors via composition-driven structural transformations,Journal of Materials Chemistry C

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Boosting phonon-induced luminescence in red fluoride phosphors via composition-driven structural transformations
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-11-01 00:00:00 , DOI: 10.1039/c7tc04695b
Fei Tang _{1,

2} , Zhicheng Su _{1,

2} , Honggang Ye _{1,

2} , Shijie Xu _{1,

2} , Wang Guo _{2,

3,

4} , Yongge Cao _{2,

5,

6} , Wenpei Gao _{7,

8,

9} , Xiaoqing Pan _{7,

8,

9}

Affiliation

In this study, a series of (K_xNa_1−x)₂SiF₆:Mn⁴⁺ red phosphors with systematic composition variations of alkali metals was synthesized via a low-temperature full-solution approach. Driven by composition variations, a sequence of continuous structural phase transformations, i.e., from trigonal to mixed, and then to orthorhombic, and eventually to a cubic phase, is evidently observed in this series of red phosphors. More excitingly, phonon-induced luminescence is promoted as the most efficient and dominant light emission mechanism in a cubic phosphor of K₂SiF₆:Mn⁴⁺ at room temperature. As a result, the overall emission intensity of cubic K₂SiF₆:Mn⁴⁺ is increased by more than fivefold with respect to that of trigonal Na₂SiF₆:Mn⁴⁺. High-resolution X-ray diffraction, electron paramagnetic resonance and micro-Raman scattering experiments consistently reveal a decisive relationship between fluorescence properties and crystalline structures.

中文翻译：

通过成分驱动的结构转换来促进红色氟化物荧光粉中声子诱导的发光

在这项研究中，通过低温全溶液法合成了具有碱金属组成变化的一系列（K _x Na _{1- x}）₂ SiF ₆：Mn ⁴⁺红色荧光粉。在成分变化的驱动下，在这一系列红色磷光体中显然观察到一系列连续的结构相变，即从三角相到混合相，然后到正交相，最后到立方相。更令人兴奋的是，声子诱导的发光作为K ₂ SiF ₆：Mn ⁴⁺的立方磷光体中最有效和主要的发光机制得到了促进。在室温下。结果，相对于三角形Na ₂ SiF ₆：Mn ⁴⁺，立方K ₂ SiF ₆：Mn ⁴⁺的总发射强度增加了五倍以上。高分辨率X射线衍射，电子顺磁共振和微拉曼散射实验一致地揭示了荧光性质与晶体结构之间的决定性关系。

更新日期：2017-11-16

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