K2MnF5·H2O as reactant for synthesizing highly efficient red emitting K2TiF6:Mn4+ phosphors by a modified cation exchange approach
K2MnF5·H2O as reactant for synthesizing highly efficient red emitting K2TiF6:Mn4+ phosphors by a modified cation exchange approach
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K2MnF5·H2O作为反应物通过改进的阳离子交换方法合成高效红光K2TiF6:Mn4荧光粉
DOI：
10.1016/j.matchemphys.2016.08.022
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发表时间：
2016-11
影响因子：
4.6
通讯作者：
Peng Lingling
中科院分区：
文献类型：
--
作者：
Han Tao;Wang Jun;Lang Tianchun;Tu Mingjing;Peng Lingling
以K2 TiF 6：Mn 4+为原料，采用简单的化学方法制备了十字形和长方形K2 MnF 5·H2O粉体。基于KMnO 4（Mn 7+）氧化K2 MnF 5·H2O（Mn 3+）生成Mn 4+的反应机理，提出了一种改进的阳离子交换法合成高效红色发光材料K2 TiF 6：Mn 4+。获得的K2 TiF 6：Mn 4+（2.7- 5.3at.%）荧光粉的粒径为30-80 μm，表面粗糙，发射光谱由5个窄带组成，发射峰位于580 ~ 660 nm，最强峰位于634.8 nm，其相对发射强度取决于KMnO_4与K_2MnF_5·H_2O的摩尔比（平台值= 3.2）;合成的K2 TiF 6：Mn 4+荧光粉的内量子产率高达82.5%，高于商品化的CaAlSiN 3：Eu 2+荧光粉的内量子产率，其激发峰位于λ 460和λ 365 nm，与Y3 A5 O 12：Ce 3+荧光粉的激发峰一致，发射峰更符合人眼视觉的灵敏度曲线。此外，我们合成的磷光体显示出更好的热猝灭性能。这些发现显示了合成的K2 TiF 6：Mn 4+磷光体的商业化的巨大潜力。
As reactant for synthesizing K2TiF6:Mn4+phosphors, the cross-shaped and cuboid-shaped K2MnF5·H2O powders were prepared by the simple chemical method. Based on the reaction mechanism, oxidizing K2MnF5·H2O (Mn3+) to Mn4+by KMnO4(Mn7+), a modified cation exchange approach for synthesizing highly efficient red emitting K2TiF6:Mn4+phosphor was proposed. The obtained K2TiF6:Mn4+(2.7–5.3 at.%) phosphors have the size of 30–80 μm with a rough surface, their emission spectra consist of five narrow bands extending from 580 to 660 nm with the strongest peak at 634.8 nm, whose relative emitting intensity depends on the molar ratio of KMnO4to K2MnF5·H2O (the platform value = 3.2), and two broad excitation bands are peaking at ∼365 nm and ∼460 nm. The internal quantum yield of our synthesized K2TiF6:Mn4+phosphors is up to 82.5%, which is higher than the commercial CaAlSiN3:Eu2+value, their excitation bands peak at ∼460 and ∼365 nm are consistent with those of Y3A5O12:Ce3+phosphors and their emission bands are more suitable for the sensitivity curve of photopic human vision. In addition, our synthesized phosphors show better thermal quenching properties. These findings show a large potential of the synthesized K2TiF6:Mn4+phosphors for commercialization.
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影响因子：
3.9
作者：
Lin, C. C.;Zheng, Y. S.;Liu, R. S.
通讯作者：
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影响因子：
4.6
作者：
Pavitra E;Raju GS;Park JY;Wang L;Moon BK;Yu JS
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影响因子：
3.4
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Takeda T
影响因子：
35
作者：
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通讯作者：
Nakamura, Shuji
影响因子：
2.4
作者：
Tan, S. T.;Sun, X. W.;DenBaars, S. P.
通讯作者：
DenBaars, S. P.