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【综述推荐】有机发光二极管:理论认识与计算方法(帅志刚、彭谦) 已有1人参与
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文章题目:Organic light-emitting diodes: theoretical understanding of highly efficient materials and development of computational methodology 文章链接(免费获取,欢迎点击下载!):https://doi.org/10.1093/nsr/nww024 Abstract: Theoretical understanding of organic light-emitting diodes started from the quest to the nature of the primary excitation in organic molecular and polymeric materials. We found the electron correlation strength, bond-length alternation as well as the conjugation extent have strong influences on the orderings of the lowest lying excited states through the first application of density matrix renormalization group theory to quantum chemistry. The electro-injected free carriers (with spin 1/2) can form both singlet and triplet bound states. We found that the singlet exciton formation ratio can exceed the conventional 25% spin statistics limit. We proposed a vibration correlation function formalism to evaluate the excited-state decay rates, which is shown to not only give reasonable estimations for the quantum efficiency but also a quantitative account for the aggregation-induced emission (AIE). It is suggested to unravel the AIE mechanism through resonance Raman spectroscopy. 对有机发光二极管的理论认识始于对有机分子和高分子材料基本激发性质的探索。通过将密度矩阵重整化群理论应用于量子化学研究,我们发现电子关联强度、键长变化以及共轭程度对最低激发态的排布有很大影响。电注入自由载流子(自旋1/2)可以形成单线态和三线态。我们发现,单线态激子形成率可以超过常规的25%自旋统计极限。我们提出了一个振动相关函数来衡量激发态的衰变率,它被证明可以给出对量子效率、以及聚集诱导发光(AIE)的合理估计。共振拉曼光谱可能为揭示AIE机理提供帮助。 【文章图】Quaterrylene and QNN的分子轨道,以及设计分子NQS, NQN, QNS, QNN, HNNN, ONNNN的发射谱。 |
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