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arXiv 2006.16474cond-mat.mtrl-sciphysics.chem-ph
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六方氮化硼中$V_B^-$缺陷的光致发光和光化学

Photoluminescence and photochemistry of the $V_B^-$ defect in hexagonal boron nitride

Jeffrey R. Reimers, Jun Shen, Mehran Kianinia, Carlo Bradac, Igor Aharonovich, Michael J. Ford, Piotr Piecuch

摘要:

计算了六方氮化硼中$V_B^-$缺陷的广泛的光化学和光谱性质,得出的结论是,与最近观察到的光学检测到的磁共振相关的观察到的光电发射最有可能是(1)3E”到(1)3A 2 '起源。从缺陷的三重态到单重态流形的快速系统间穿越解释了观察到的短激发态寿命和非常低的量子产率。新的实验结果揭示了更小的固有光谱带宽比以前认识到的,解释在由Jahn-Teller效应引起的光谱窄化和零声子线移位。不同类型的计算方法被应用到映射出复杂的三重态和单重态缺陷流形,包括双电离的运动方程耦合簇理论,旨在处理缺陷态的开壳层性质,以及混合量子力学/分子力学方案,使5763原子模拟。其他两个积极可行的光谱分配之间的单重态和三重态流形被认为是,但排除了基于不适当的光化学性质。

英文摘要:

Extensive photochemical and spectroscopic properties of the $V_B^-$ defect in hexagonal boron nitride are calculated, concluding that the observed photoemission associated with recently observed optically-detected magnetic resonance is most likely of (1)3E" to (1)3A2' origin. Rapid intersystem crossing from the defect's triplet to singlet manifolds explains the observed short excited-state lifetime and very low quantum yield. New experimental results reveal smaller intrinsic spectral bandwidths than previously recognized, interpreted in terms spectral narrowing and zero-phonon-line shifting induced by the Jahn-Teller effect. Different types of computational methods are applied to map out the complex triplet and singlet defect manifolds, including the doubly ionised formulation of the equation-of-motion coupled-cluster theory that is designed to deal with the open-shell nature of defect states, and mixed quantum-mechanics/molecular-mechanics schemes enabling 5763-atom simulations. Two other energetically feasible spectral assignments from amongst the singlet and triplet manifolds are considered, but ruled out based on inappropriate photochemical properties.

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