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Interplay of Phonon Directionality and Emission Polarization in Two-Dimensional Layered Metal Halide Perovskites
Accounts of Chemical Research ( IF 16.4 ) Pub Date : 2024-08-21 , DOI: 10.1021/acs.accounts.4c00259 Roman Krahne 1 , Miao-Ling Lin 2, 3 , Ping-Heng Tan 2, 3
Accounts of Chemical Research ( IF 16.4 ) Pub Date : 2024-08-21 , DOI: 10.1021/acs.accounts.4c00259 Roman Krahne 1 , Miao-Ling Lin 2, 3 , Ping-Heng Tan 2, 3
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Layered metal halide perovskites represent a natural quantum well system for charge carriers that provides rich physics, and the organic encapsulation of the inorganic metal halide layers not only increases their stability in devices but also provides an immense freedom to design their functionality. Intriguingly, these organic moieties strongly impact the optical, electrical, and mechanical properties, not only through their dielectric, elastic, and chemical properties but also because of induced mechanical distortions in the inorganic lattice. This tunability makes two-dimensional layered perovskites (2DLPs) highly attractive as light emitters. Common consensus is that exciton–phonon coupling plays an important role in radiative recombination. For bulk and some two-dimensional (2D) materials, the band edge emission broadening can be described by the classic models for polar inorganic semiconductors, while for the temperature dependence of the self-trapped exciton emission, an analysis developed for color centers has been successfully applied. For many 2DLPs these approaches do not work because of the complexity of their vibrational spectra. However, their emission is still strongly determined by phonons, and therefore, an adequate understanding of the electron–phonon coupling needs to be developed.
中文翻译：
二维层状金属卤化物钙钛矿中声子方向性和发射偏振的相互作用
层状金属卤化物钙钛矿代表了电荷载流子的天然量子阱系统，提供了丰富的物理特性，无机金属卤化物层的有机封装不仅提高了它们在器件中的稳定性，而且还提供了设计其功能的巨大自由度。有趣的是，这些有机部分强烈影响光学、电学和机械性能，不仅通过它们的介电、弹性和化学性能，而且还因为无机晶格中诱发的机械变形。这种可调性使得二维层状钙钛矿（2DLP）作为发光体非常有吸引力。普遍的共识是激子-声子耦合在辐射复合中起着重要作用。对于块体和一些二维（2D）材料，带边发射展宽可以通过极性无机半导体的经典模型来描述，而对于自俘获激子发射的温度依赖性，针对色心开发的分析已经被开发出来。成功申请。对于许多 2DLP 来说，由于其振动谱的复杂性，这些方法不起作用。然而，它们的发射仍然很大程度上由声子决定，因此，需要对电子声子耦合有充分的了解。
更新日期：2024-08-21
中文翻译：
二维层状金属卤化物钙钛矿中声子方向性和发射偏振的相互作用
层状金属卤化物钙钛矿代表了电荷载流子的天然量子阱系统，提供了丰富的物理特性，无机金属卤化物层的有机封装不仅提高了它们在器件中的稳定性，而且还提供了设计其功能的巨大自由度。有趣的是，这些有机部分强烈影响光学、电学和机械性能，不仅通过它们的介电、弹性和化学性能，而且还因为无机晶格中诱发的机械变形。这种可调性使得二维层状钙钛矿（2DLP）作为发光体非常有吸引力。普遍的共识是激子-声子耦合在辐射复合中起着重要作用。对于块体和一些二维（2D）材料，带边发射展宽可以通过极性无机半导体的经典模型来描述，而对于自俘获激子发射的温度依赖性，针对色心开发的分析已经被开发出来。成功申请。对于许多 2DLP 来说，由于其振动谱的复杂性，这些方法不起作用。然而，它们的发射仍然很大程度上由声子决定，因此，需要对电子声子耦合有充分的了解。
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