Emergence of multi-peak emission in CsBr-Cs4PbBr6-CsPbBr3 nanocrystals at room temperature

IF 2.7 4区材料科学 Q3 MATERIALS SCIENCE, MULTIDISCIPLINARY

Journal of Materials Research Pub Date : 2024-07-22 DOI:10.1557/s43578-024-01372-y

Chandrima Goswami, Asha Bhardwaj

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Abstract

Highly stable and bright emitting CsBr-Cs₄PbBr₆-CsPbBr₃ perovskite nanocrystals were synthesized using chemical route. For nanocrystals formed at higher Cs:Pb (10:1) ratios, multiple peak emission was observed in the UV–visible region (325–550 nm), while at lower Cs:Pb ratios (5:1 to 2.5:1), narrow high-intensity peak (at 522 nm, the signature peak of CsPbBr₃) along with a diminished broad multi-peak emission (325–500 nm) is observed. Blue-emitting nanocrystals were observed at higher Cs:Pb precursor (Pb deficient conditions) ratios. As concentration of Pb increases (Cs:Pb ratio decreases), contribution from broad emission decreases while green emitting 522 nm peak dominates. This broad emission is unique at room temperature for CsBr-Cs₄PbBr₆-CsPbBr₃ mixture of nanocrystals, unlike the single peak narrow emission reported in literature so far for inorganic lead halide perovskites. It is worth mentioning that the CsBr-Cs₄PbBr₆-CsPbBr₃ mixture of nanocrystals is highly stable and hence can be used for various optoelectronic applications.

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室温下 CsBr-Cs4PbBr6-CsPbBr3 纳米晶体中出现的多峰发射

利用化学方法合成了高稳定性和高亮度发射的铯硼-铯4硼-硼6-铯硼-硼3包晶纳米晶体。在较高的铯:铅比例（10:1）下形成的纳米晶体，在紫外可见光区域（325-550 nm）观察到多峰发射，而在较低的铯:铅比例（5:1 至 2.5:1）下，观察到窄的高强度峰（522 nm 处，CsPbBr3 的特征峰）以及减弱的宽多峰发射（325-500 nm）。在 Cs:Pb 前驱体（缺铅条件）比率较高时，可观察到蓝色发射纳米晶体。随着 Pb 浓度的增加（Cs:Pb 比值降低），宽发射的贡献减小，而 522 nm 的绿色发射峰占主导地位。这种宽发射是 CsBr-Cs4PbBr6-CsPbBr3 纳米晶体混合物在室温下的独特现象，与迄今为止文献中报道的无机卤化铅包晶石的单峰窄发射不同。值得一提的是，CsBr-Cs4PbBr6-CsPbBr3 纳米晶体混合物非常稳定，因此可用于各种光电应用。

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来源期刊

Journal of Materials Research 工程技术-材料科学：综合

CiteScore

4.50

自引率

3.70%

发文量

362

审稿时长

2.8 months

期刊介绍： Journal of Materials Research (JMR) publishes the latest advances about the creation of new materials and materials with novel functionalities, fundamental understanding of processes that control the response of materials, and development of materials with significant performance improvements relative to state of the art materials. JMR welcomes papers that highlight novel processing techniques, the application and development of new analytical tools, and interpretation of fundamental materials science to achieve enhanced materials properties and uses. Materials research papers in the following topical areas are welcome. • Novel materials discovery • Electronic, photonic and magnetic materials • Energy Conversion and storage materials • New thermal and structural materials • Soft materials • Biomaterials and related topics • Nanoscale science and technology • Advances in materials characterization methods and techniques • Computational materials science, modeling and theory