Mechanochemical synthesis of stable, quantum-confined CsPbBr3 perovskite nanocrystals with blue-green emission and high PLQY

IF 2.9 4区 物理与天体物理 Q2 OPTICS
A. Goyal, E. Andrioti, Y. Tang, Qianchuan Zhao, K. Zheng, K. Newell, P. Schall
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引用次数: 1

Abstract

Cesium lead halides are a family of bright, visible-light emitting materials with near-unity photoluminescence quantum yield (PLQY) in nanocrystals (NCs). The usual way to achieve visible light-emission tunability is by mixing halides, which often leads to phase separation and poor stability. While the NCs should also show size-dependent PL emission, reports on strong quantum confinement in these materials are scarce. Here, we report the synthesis of quantum-confined cesium lead bromide (CsPbBr3) NCs via a facile, environment-friendly, and scalable high-energy mechanochemical synthesis route. The PLQY measured is ∼85%, even after 90 days of synthesis, and the emission wavelength is shifted from green, 520 nm, to blue, 460 nm by quantum confinement in NCs of size 3–5 nm. Micro-PL optical spectroscopy and atomic force microscopy confirm the size tunability of PL on a single-dot scale. Our work demonstrates the potential of mechanochemical synthesis in the medium-scale production of bright luminescent quantum-confined NCs that could be extended to other materials as well.
具有蓝绿色发射和高PLQY的稳定、量子限制的CsPbBr3钙钛矿纳米晶体的机械化学合成
卤化铯铅是一类在纳米晶体中具有近单位光致发光量子产率(PLQY)的明亮可见发光材料。通常实现可见光发射可调性的方法是通过混合卤化物,这往往导致相分离和稳定性差。虽然nc也应该显示出与尺寸相关的PL发射,但关于这些材料中强量子约束的报道很少。在这里,我们报道了一种简单、环保、可扩展的高能机械化学合成途径合成量子限制的铯溴化铅(CsPbBr3) NCs。即使在合成90天后,测得的PLQY仍为~ 85%,并且由于尺寸为3-5 nm的nc中的量子约束,发射波长从绿色520 nm转变为蓝色460 nm。微PL光谱学和原子力显微镜证实了PL在单点尺度上的尺寸可调性。我们的工作证明了机械化学合成在中等规模生产明亮发光量子限制的nc方面的潜力,也可以扩展到其他材料。
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来源期刊
CiteScore
3.00
自引率
48.10%
发文量
53
审稿时长
3 months
期刊介绍: This journal is devoted to the rapidly advancing research and development in the field of nonlinear interactions of light with matter. Topics of interest include, but are not limited to, nonlinear optical materials, metamaterials and plasmonics, nano-photonic structures, stimulated scatterings, harmonic generations, wave mixing, real time holography, guided waves and solitons, bistabilities, instabilities and nonlinear dynamics, and their applications in laser and coherent lightwave amplification, guiding, switching, modulation, communication and information processing. Original papers, comprehensive reviews and rapid communications reporting original theories and observations are sought for in these and related areas. This journal will also publish proceedings of important international meetings and workshops. It is intended for graduate students, scientists and researchers in academic, industrial and government research institutions.
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