Broadband Emission Induced by Band‐Edge Carrier Reconfiguration in 2D Hybrid Lead Halide Perovskites

材料科学 光电子学 宽带 钙钛矿(结构) 光致发光 静水压力 光学 化学 物理 结晶学 热力学
作者
Zhigang Li,Dong Xiaohui,Haipeng Song,Shi‐Shuang Huang,Huan Hu,Wei Li,Mei‐Hui Yu,Jacky Even,Xian‐He Bu
出处
期刊:Small methods [Wiley]
被引量:1
标识
DOI:10.1002/smtd.202301662
摘要

Broadband emission in hybrid lead halide perovskites (LHPs) has gained significant attention due to its potential applications in optoelectronic devices. The origin of this broadband emission is primarily attributed to the interactions between electrons and phonons. Most investigations have focused on the impact of structural characteristics of LHPs on broadband emission, while neglecting the role of electronic mobility. In this work, the study investigates the electronic origins of broadband emission in a family of 2D LHPs. Through spectroscopic experiments and density functional theory calculations, the study unveils that the electronic states of the organic ligands with conjugate effect in LHPs can extend to the band edges. These band-edge carriers are no longer localized only within the inorganic layers, leading to electronic coupling with molecular states in the barrier and giving rise to additional interactions with phonon modes, thereby resulting in broadband emission. The high-pressure photoluminescence measurements and theoretical calculations reveal that hydrostatic pressure can induce the reconfiguration of band-edge states of charge carriers, leading to different types of band alignment and achieving macroscopic control of carrier dynamics. The findings can provide valuable guidance for targeted synthesis of LHPs with broadband emission and corresponding design of state-of-the-art optoelectronic devices.
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