有机异质结构的磁致发光：解析理论和光谱分辨测量
Magneto-electroluminescence of organic heterostructures: Analytical theory and spectrally resolved measurements
摘要：
磁场对有机发光器件电致发光的影响源于电子/空穴极化子与主体分子氢核之间的超精细相互作用。本文提出了有机半导体磁致发光的解析理论。具体而言，我们专注于双层异质结器件。在我们所考虑的情况下，在施主和受主层的界面处的光产生是由激基复合物的形成和复合引起的。自旋物理由电子/空穴自旋密度矩阵的随机Liouville方程描述。通过Bloch-Wangsness-Redfield理论的稳态解析解，探讨了超精细相互作用强度和外加磁场对单重态/三重态激基复合物比的影响.为了验证理论，光谱分辨电致发光实验上的BPhen/m-MTDATA器件进行了分析。随着发射波长的增加，电致发光的磁场调制曲线的宽度增加，而其深度减小。这些观察结果与模型一致。最后，分析理论被扩展到一个额外的低场结构，由于交换相互作用的弱束缚极化子对状态。
英文摘要：
The effect of a magnetic field on the electroluminescence of organic light emitting devices originates from the hyperfine interaction between the electron/hole polarons and the hydrogen nuclei of the host molecules. In this paper, we present an analytical theory of magneto-electroluminescence for organic semiconductors. To be specific, we focus on bilayer heterostructure devices. In the case we are considering, light generation at the interface of the donor and acceptor layers results from the formation and recombination of exciplexes. The spin physics is described by a stochastic Liouville equation for the electron/hole spin density matrix. By finding the steady-state analytical solution using Bloch-Wangsness-Redfield theory, we explore how the singlet/triplet exciplex ratio is affected by the hyperfine interaction strength and by the external magnetic field. To validate the theory, spectrally-resolved electroluminescence experiments on BPhen/m-MTDATA devices are analyzed. With increasing emission wavelength, the width of the magnetic field modulation curve of the electroluminescence increases while its depth decreases. These observations are consistent with the model. Finally, the analytical theory is extended to account for an additional low-field structure due to the exchange interaction in the weakly bound polaron-pair states.
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