Computational Study of Dipole Radiation in Re-Absorbing Perovskite Semiconductors for Optoelectronics.
Computational Study of Dipole Radiation in Re-Absorbing Perovskite Semiconductors for Optoelectronics.
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光电子学中再吸收钙钛矿半导体偶极辐射的计算研究。
DOI：
10.1002/advs.202003559
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发表时间：
2021-03
期刊：
影响因子：
--
通讯作者：
Greenham NC
中科院分区：
文献类型：
--
作者：
Cho C;Greenham NC
与有机发射体相比，钙钛矿材料一般具有较小的斯托克斯位移和相应的较大的偶极发射的再吸收。忽略重吸收的经典光学建模方法不能提供对观察到的光发射特性的充分描述。本文介绍了钙钛矿型发光二极管的光学建模方法和设计原则。利用传输矩阵理论对钙钛矿型光电子器件内部偶极子辐射产生的Pointing矢量进行了量子化。提出了一种策略来处理与附近发射材料的非辐射耦合，否则可能导致计算中的非物理发散。还研究了关于在衬底中传播的光的相干性以及系统中没有光吸收体的稳定性问题。通过对偶极子产生轮廓的递归计算，考虑了光子循环效应的好处。模拟结果表明，通过优化微腔、偶极子取向和光子循环效应，三碘甲酰胺铅基钙钛矿型发光二极管的外量子效率可达到≈的40%。与目前报道的传统器件结构不同，这项工作突出了厚电荷传输层和具有小斯托克斯位移的厚钙钛矿结构的优点。研究了钙钛矿型发光二极管的光学模拟方法。钙钛矿中的重吸收导致了经典光学模拟方法的发散。在这里，发散是通过探索非辐射近场耦合到附近发射物质的物理意义来解决的。这使得能够对钙钛矿中的光发射进行定量分析，包括光子循环的贡献。
Compared to organic emitters, perovskite materials generally have a small Stokes shift and correspondingly large re‐absorption of dipole emission. Classical optical modelling methods ignoring re‐absorption do not provide an adequate description of the observed light emission properties. Here, optical modelling methods and design rules for perovskite light‐emitting diodes are presented. The transfer‐matrix formalism is used to quantify the Poynting vectors generated by a dipole radiating inside a perovskite optoelectronic device. A strategy is presented to deal with non‐radiative coupling to nearby emissive material that can otherwise lead to non‐physical divergence in the calculation. Stability issues are also investigated regarding coherence of the light propagating in the substrate and the absence of a light absorber in the system. The benefit of the photon recycling effect is taken into account by recursive calculation of the dipole generation profile. The simulation results predict that a high external quantum efficiency of ≈40% is achievable in formamidinium lead triiodide‐based perovskite light‐emitting diodes, by optimization of microcavity, dipole orientation, and photon recycling effects. Contrary to conventional device structures currently reported, this work highlights the benefits of thick charge transport layers and thick perovskite with small Stokes shift. The methodology for optical modelling of perovskite light‐emitting diodes is investigated. Reabsorption in the perovskite causes divergence in classical methods of optical modelling. Here, the divergence is resolved by exploring the physical meaning of non‐radiative nearfield coupling to nearby emissive material. This enables the quantitative analysis of light emission in perovskites, including the contribution of photon recycling.
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影响因子：
3.8
作者：
Cho, Changsoon;Lee, Jung-Yong
通讯作者：
Lee, Jung-Yong
影响因子：
3.7
作者：
Koster, LJA;Smits, ECP;Blom, PWM
通讯作者：
Blom, PWM
影响因子：
16.6
作者：
Li, Yungui;Kovacic, Milan;Reineke, Sebastian
通讯作者：
Reineke, Sebastian
影响因子：
3.6
作者：
Koenderink, A. F.
通讯作者：
Koenderink, A. F.
影响因子：
16.6
作者：
Richter, Johannes M.;Abdi-Jalebi, Mojtaba;Friend, Richard H.
通讯作者：
Friend, Richard H.