A highly-distorted octahedron with a C2v group symmetry inducing an ultra-intense zero phonon line in Mn4+-activated oxyfluoride Na2WO2F4,Journal of Materials Chemistry C

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A highly-distorted octahedron with a C2v group symmetry inducing an ultra-intense zero phonon line in Mn4+-activated oxyfluoride Na2WO2F4
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2017-09-05 00:00:00 , DOI: 10.1039/c7tc03655h
Tao Hu _{1,

2,

3,

4,

5} , Hang Lin _{1,

2,

3,

4,

5} , Yao Cheng _{1,

2,

3,

4,

5} , Qingming Huang _{5,

6,

7,

8} , Ju Xu _{1,

2,

3,

4,

5} , Yan Gao _{1,

2,

3,

4,

5} , Jiaomei Wang _{1,

2,

3,

4,

5} , Yuansheng Wang _{1,

2,

3,

4,

5}

Affiliation

Owing to the magnetic dipole nature, the zero phonon line (ZPL) of Mn⁴⁺:²E → ⁴A₂ transition is weak unless Mn⁴⁺ is situated at a site deviating from the centrosymmetric nature. Herein, we report a brand-new oxyfluoride, Na₂WO₂F₄:Mn⁴⁺(NWOF:Mn⁴⁺), which shows unprecedented intense red ZPL at ∼620 nm along with relatively weak vibronic transitions under blue light excitation. This peculiar spectral feature is demonstrated to be originated from the highly distorted octahedral coordination environment in the C_2v group symmetry surrounding Mn⁴⁺. High-resolution spectroscopic studies at 10 K disclose the fine structured electronic/vibronic transitions of Mn⁴⁺:²E, ²T₁ → ⁴A₂ and the weak electron–phonon interaction (Huang–Rhys factor S < 1) on the Mn⁴⁺ emissive state. Benefiting from the intense ZPL, an ultra-high color rendering index with Ra = 92.7 and R9 = 90.0 is achieved in the w-LED using YAG:Ce³⁺and NWOF:Mn⁴⁺ as color converters, and a wide color gamut of 107.1% NTSC in the w-LED using CsPbBr₃ quantum dots and NWOF:Mn⁴⁺ is obtained. Herein, we first demonstrate that Mn⁴⁺-activated oxyfluorides have great potential in w-LED lighting and display applications. Our study can also enlighten researchers to design highly distorted octahedral sites for Mn⁴⁺ doping to achieve an ultra-intense ZPL.

中文翻译：

具有C _2v基团对称性的高度畸变的八面体，在Mn ⁴⁺活化的氟氧化物Na ₂ WO ₂ F _4中诱导了超强零声子线。

由于磁偶极性质，零声子线的Mn（ZPL）⁴⁺：² ë→ ⁴阿₂过渡是弱除非的Mn ⁴⁺位于一个站点从中心对称性质偏离。在本文中，我们报道了一种全新的氟氧化物Na ₂ WO ₂ F ₄：Mn ⁴⁺（NWOF：Mn ⁴⁺），它在620 nm处显示出前所未有的强烈红色ZPL，并且在蓝光激发下呈现出相对较弱的振动跃迁。事实证明，这种独特的光谱特征源自于Mn周围C _2v群对称的高度扭曲的八面体配位环境。⁴⁺。10 K的高分辨率光谱研究揭示了Mn⁴⁺：² E，² T₁ →⁴ A₂的精细结构的电子/振动跃迁，以及Mn上的弱电子-声子相互作用（Huang-Rhys因子S <1）⁴⁺发射状态。得益于强大的ZPL，在使用YAG：Ce³⁺和NWOF：Mn⁴⁺作为颜色转换器的w-LED中实现了Ra = 92.7和R9 = 90.0的超高显色指数，并且色域宽使用CsPbBr₃量子点和NWOF：Mn⁴⁺的w-LED中的NTSC为107.1％获得。在这里，我们首先证明Mn ⁴⁺活化的氟氧化物在w-LED照明和显示应用中具有巨大的潜力。我们的研究还可以启发研究人员为Mn ⁴⁺掺杂设计高度失真的八面体位点，以实现超强ZPL。

更新日期：2017-09-18

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