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首页> 外文期刊>The Journal of Chemical Physics >Photoluminescence properties of Jahn-Teller transition-metal ions
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Photoluminescence properties of Jahn-Teller transition-metal ions

机译：Jahn-Teller过渡金属离子的光致发光特性

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摘要

This work investigates the influence of electron-phonon coupling associated with E e and TeeJahn–Teller (JT) effect in different transition-metal (TM) ions on de-excitation phenomena throughnonradiative multiphonon relaxation, i.e., photoluminescence (PL) quenching. We developed aconfigurational curve model which is able to predict from the absorption spectrum whether a givenJT-TM ion is PL or quenched. The prediction is made on the basis of an adapted Dexter–Klick-Russell parameter for JT systems, defined in terms of spectroscopic parameters through AJT= αΔ_e~(abs)/E_(abs),where Δ_e~(abs)refers to the splitting of parent octahedralEgstates by JT distortionin E e (α=3 / 4) or T e (α=1 / 4), and E_(abs)is the energy of first absorption band involvingelectronic transition between E_gandT_(2g).We show that PL in any JT-TM ion occurs whenever∧JT< 0.1or is quenched if∧JT> 0.2. This result noteworthy since it allows us to establishstructural requirements for the JT-TM ion and the host crystal to be PL. Although PL properties ofmaterials containing TM ions depend on a variety of structural factors such as the electronicconfiguration, the site symmetry, and the crystal field produced by neighboring atoms, the presentmodel achieves this goal through a simple spectroscopic parameter: ∧JT.In this work we correlatedthe PL properties of different sixfold-coordinated JT systems such as Ti~(3+),Cu~(2+),Mn~(Cr~(Fe~(Co~(3+),and Ni~(3+)in halides oxides with∧JTobtained from their respective absorption spectra.From this analysis we conclude that depending on the nature of the JT coupling and its strength, PLis either strongly favored or quenched in T e while it is mostly quenched in E e systems due tothe larger JT distortion.
机译：这项工作研究了电子-声子耦合与E e和TeeJahn-Teller（JT）效应在不同的过渡金属（TM）离​​子中通过无辐射多声子弛豫即光致发光（PL）猝灭引起的去磁现象的影响。我们开发了配置曲线模型，该模型能够从吸收光谱中预测给定的JT-TM离子是PL还是淬灭的。该预测是基于适用于JT系统的Dexter–Klick-Russell参数进行的，该参数根据AJT =αΔ_e〜（abs）/ E_（abs）的光谱参数定义，其中Δ_e〜（abs）表示分裂通过E（α= 3/4）或T e（α= 1/4）的JT畸变产生的母八面体Egstates，而E_（abs）是涉及E_gandT_（2g）之间电子跃迁的第一吸收带的能量。只要∧JT<0.1或如果∧JT> 0.2被淬灭，任何JT-TM离子中的离子都会发生。该结果值得关注，因为它使我们能够确定JT-TM离子和要成为PL的基质晶体的结构要求。尽管含TM离子的材料的PL特性取决于各种结构因素，例如电子构型，位点对称性以及相邻原子产生的晶场，但本模型通过一个简单的光谱参数∧JT达到了这一目标。关联了Ti〜（3 +），Cu〜（2 +），Mn〜（Cr〜（Fe〜（Co〜（3+））和Ni〜（3+）等六种配位JT体系的PL性质根据其分析，我们得出结论，根据JT偶合的性质及其强度，PL在T e中受到强烈青睐或被淬灭，而由于其较大，大部分在E e系统中被淬灭。 JT失真。

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