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首页> 外文期刊>Advanced Functional Materials >Broadband Defects Emission and Enhanced Ligand Raman Scattering in 0D Cs_3Bi_2l_9 Colloidal Nanocrystals
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Broadband Defects Emission and Enhanced Ligand Raman Scattering in 0D Cs_3Bi_2l_9 Colloidal Nanocrystals

机译：0D Cs_3Bi_2l_9胶体纳米晶体中的宽带缺陷发射和增强的配体拉曼散射

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摘要

Excitonic 0D and 2D lead-halide perovskites have been recently developed and investigated as new materials for light generation. Here broadband (1 eV) emission from newly synthesized 0D lead-free colloidal Cs3Bi2I9 nanocrystals (NCs) is reported. The nature of their emissive states as well as the relative dynamics which are currently hotly debated are investigated. In particular, it is found that the broadband emission is made by the coexistence of emissive excitons and sub-bandgap emissive trap-states. Remarkably, evidence of enhanced Raman scattering from the ligands is observed when attached to the NCs surface, an effect that is preliminarily attributed to strong exciton-ligands electronic coupling in these systems.
机译：Excitonic 0D和2D卤化铅钙钛矿最近已被开发出来，并已作为发光的新材料进行了研究。这里报道了新合成的0D无铅胶体Cs3Bi2I9纳米晶体（NCs）的宽带（> 1 eV）发射。研究了它们的发射状态的性质以及目前正在激烈争论的相对动力学。特别地，发现宽带发射是由发射激子和子带隙发射陷阱态的共存引起的。值得注意的是，当附着到NCs表面时，观察到了拉曼散射增强的证据，这种作用最初归因于这些系统中的强激子-配体电子耦合。

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