Particularly developed transition from the 5D1 level of Eu3+ and its significant contribution to the improved photocatalysis of (Bi3Li)O4Cl2 via prolonging the decay time of the excited state,Journal of Materials Chemistry C

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Particularly developed transition from the 5D1 level of Eu3+ and its significant contribution to the improved photocatalysis of (Bi3Li)O4Cl2 via prolonging the decay time of the excited state
Journal of Materials Chemistry C ( IF 5.7 ) Pub Date : 2020-10-02 , DOI: 10.1039/d0tc03718d
Donglei Wei _{1,

2,

3,

4} , Zutao Fan _{1,

2,

3,

4} , Yanlin Huang _{5,

6,

7,

8,

9} , Hyo Jin Seo _{1,

2,

3,

4}

Affiliation

There is a close correlation between the photoluminescence and photocatalysis of a semiconductor because the two processes involve the same electronic transition. Eu³⁺ is one of the most popular rare-earth ions; it presents efficient luminescence and improved photocatalysis. Usually, the luminescence from the higher states (⁵D_1,2) of Eu³⁺ can be hardly observed due to cross-relaxation processes. This work demonstrates a particularly developed transition from the ⁵D₁ level of Eu³⁺ and its significant contribution to the improved photocatalysis of (Bi₃Li)O₄Cl₂ via prolonging the decay time of the excited state. Single-phase (Bi_3−3xEu_3xLi)O₄Cl₂ (x = 0, 0.01, 0.03, 0.05) was synthesized by the sol–gel method in combination with a solid-state reaction. This is a bismuth layer structure with [(Bi/Li)O₂]²⁺ layers formed by alternative Bi³⁺ and Li⁺ stripes. The intrinsic luminescence of (Bi₃Li)O₄Cl₂ (λ_em = 500 nm) with a decay time of 0.26 μs was detected even at 300 K. Unusually, the phosphor shows a prominent transition from ⁵D₁ in (Bi_3−3xEu_3xLi)O₄Cl₂. Moreover, in addition to ⁵D₀ → ⁷F₃, ⁵D₀ → ⁷F_J (J = 0, 1, 2, 4) is characterized by intense transitions with comparable intensities. The intrinsic emission of (Bi₃Li)O₄Cl₂ has a decay time which involves the band transition of an electron from the valence band to the conduction band. In Eu³⁺-doped (Bi₃Li)O₄Cl₂, there are midgap states formed by the ⁵D₁ level with a longer lifetime of about 60 μs. The D₁ levels of Eu³⁺ significantly contribute to the separation of light-induced charges by prolonging the decay time of the excited states. This work demonstrates a simple strategy to develop optical materials with simultaneous luminescence and has improved the photocatalysis in bismuth oxychlorides featuring strong polarization and rigid phonons.

中文翻译：

从Eu3 +的5D1能级转变而来的特别发达的过渡过程，它通过延长激发态的衰变时间对改善（Bi3Li）O4Cl2的光催化作用做出了重大贡献

半导体的光致发光与光催化之间有着紧密的联系，因为这两个过程涉及相同的电子跃迁。Eu ³⁺是最受欢迎的稀土离子之一。它提供了有效的发光和改进的光催化作用。通常，由于交叉弛豫过程，几乎不能观察到来自Eu ³⁺的较高态（⁵ D _1,2）的发光。这项工作证明了从⁵ D ₁的Eu ³⁺过渡到一个特别发达的过程，它对改善（Bi ₃ Li）O ₄ Cl ₂通过延长激发态的衰减时间。通过溶胶-凝胶法结合固相反应合成了单相（Bi _{3-3 x} Eu _{3 x} Li）O ₄ Cl ₂（x = 0、0.01、0.03、0.05）。这是一种铋层结构，具有[（Bi / Li）O ₂ ] ²⁺层，由交替的Bi ³⁺和Li ⁺条纹形成。的固有发光的（Bi ₃栗）O ₄氯₂（λ _EM = 500纳米）与所检测的0.26微秒的衰减时间，即使在300K异常地，磷光体显示出突出的选自过渡⁵ D₁ in（Bi_{3-3 x} Eu_{3 x} Li）O₄ Cl₂。此外，除了⁵ D₀ →⁷ F_3之外，⁵ D₀ →⁷ F_J（ J = 0，1，2，4）的特征还在于强度相当的剧烈跃迁。（Bi₃ Li）O₄ Cl_2的本征发射具有衰减时间，该衰减时间涉及电子从价带到导带的能带跃迁。In Eu³⁺掺杂（Bi_在3 Li）O₄ Cl_2中，存在由⁵ D₁能级形成的中间间隙状态，具有约60μs的较长寿命。Eu³⁺的D₁能级通过延长激发态的衰减时间，显着地促进了光诱导电荷的分离。这项工作展示了开发具有同步发光特性的光学材料的简单策略，并改善了具有强偏振和刚性声子的三氯氧化铋的光催化性能。

更新日期：2020-10-16

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