提高铟合金单分散无铅双钙钛矿Cs2AgBiBr6纳米晶的发光性能

IF 3.2 3区 化学 Q2 CHEMISTRY, PHYSICAL
Lihong Qi, Song Wang, Hongyan Li, Ruiji Sun, Yi Wu, Ruirui Wang, Liangying Hua, Ying Xie* and Kai Pan*, 
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引用次数: 0

摘要

无铅双钙钛矿纳米晶体(NCs)由于能够解决与铅基钙钛矿纳米晶体相关的毒性和不稳定性问题而引起了广泛的关注。在此,我们成功地通过胶体溶液法合成了一系列具有不同浓度In3+合金化的Cs2AgBiBr6 NCs。这些纳米颗粒始终呈现出单分散、均匀的立方形态。通过精心调整In3+的合金浓度,我们显著提高了Cs2AgBiBr6 NCs的发光性能,在最佳的In3+合金浓度下,Cs2AgBiBr6 NCs的最大光致发光量子产率达到14.69%。同时,激子寿命明显延长4.6倍,大大增强了载流子动力学。温度依赖性光致发光光谱分析进一步证实,与In3+合金化后,NCs不仅表现出强的库仑力和高的热稳定性,而且显著减少了非辐射转变过程。此外,密度泛函理论计算表明,In3+合金化导致电荷密度的重新分布,深刻影响电子结构,从而提高载流子迁移率。因此,本研究不仅为In3+合金化在增强双钙钛矿纳米材料发光性能方面的作用提供了有价值的见解,而且为未来光电器件的潜在应用前景开辟了广阔的前景。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Enhancing the Luminescence Performance of Monodisperse Lead-Free Double Perovskite Cs2AgBiBr6 Nanocrystals Alloyed with Indium

Enhancing the Luminescence Performance of Monodisperse Lead-Free Double Perovskite Cs2AgBiBr6 Nanocrystals Alloyed with Indium

Lead-free double perovskite nanocrystals (NCs) have garnered significant attention due to their ability to address the toxicity and instability issues associated with lead-based perovskite NCs. Herein, we have successfully synthesized a series of Cs2AgBiBr6 NCs with varying concentrations of In3+ alloying, achieved through a colloidal solution method. These NCs consistently exhibit a monodisperse, uniform cubic morphology. By meticulously adjusting the alloying concentration of In3+, we have significantly enhanced the luminescence performance of Cs2AgBiBr6 NCs, achieving a maximum photoluminescence quantum yield of 14.69% at the optimal In3+ alloying concentration. Simultaneously, the exciton lifetime was markedly extended 4.6 times, greatly enhancing carrier dynamics. Temperature-dependent photoluminescence spectroscopy analysis further confirms that postalloying with In3+, the NCs not only exhibit strong Coulombic forces and high thermal stability but also significantly reduce nonradiative transition processes. Moreover, density functional theory calculations reveal that In3+ alloying leads to a redistribution of charge density, profoundly affecting the electronic structure and subsequently enhancing the carrier mobility. Therefore, this study not only provides valuable insights into the role of In3+ alloying in enhancing the luminescence performance of double perovskite NCs but also opens up potential application prospects for optoelectronic devices in the future.

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来源期刊
The Journal of Physical Chemistry C
The Journal of Physical Chemistry C 化学-材料科学:综合
CiteScore
6.50
自引率
8.10%
发文量
2047
审稿时长
1.8 months
期刊介绍: The Journal of Physical Chemistry A/B/C is devoted to reporting new and original experimental and theoretical basic research of interest to physical chemists, biophysical chemists, and chemical physicists.
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