Scalable synthesis and optical tuning of CsPbBr3 nanocrystal inks for dual-color anti-counterfeiting applications

IF 4.6 3区材料科学 Q2 CHEMISTRY, MULTIDISCIPLINARY

Nanoscale Advances Pub Date : 2025-09-09 DOI:10.1039/D5NA00602C

Tianming Sun†, Yining Zhao, Yujia Fan, Xiaoyu Guo, Zhexin Tang and Mingqing Wang

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Abstract

We present a scalable, ambient-air synthesis of CsPbBr₃ perovskite nanocrystal (NC) inks with enhanced optical performance and environmental stability, enabled by post-synthetic surface modification using oleylamine (OAm). Systematic tuning of OAm concentration led to NCs with reduced particle size, improved crystallinity, and effective defect passivation, yielding a peak photoluminescence quantum yield (PLQY) of 93.1% and a prolonged carrier lifetime of 84.02 ns. These modified NCs exhibited significantly improved long-term structural stability compared to unmodified samples. Furthermore, halide exchange via iodine incorporation enabled controlled emission tuning from green to red. Dual-color emissive inks were digitally printed into high-resolution patterns on flexible substrates, which remained inconspicuous under visible light but displayed vivid fluorescence under UV illumination. This dual-mode visibility offers a secure and versatile platform for next-generation anti-counterfeiting technologies and information encryption, demonstrating the potential of perovskite NCs in advanced functional ink applications.

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双色防伪CsPbBr3纳米晶油墨的可扩展合成和光学调谐。

我们提出了一种可扩展的，环境空气合成CsPbBr3钙钛矿纳米晶体（NC）油墨，具有增强的光学性能和环境稳定性，通过合成后使用聚胺（OAm）进行表面改性。系统调节OAm浓度可使纳米颗粒尺寸减小，结晶度提高，缺陷钝化效果显著，峰值光致发光量子产率（PLQY）达到93.1%，载流子寿命延长至84.02 ns。与未改性的样品相比，这些改性的nc具有显著提高的长期结构稳定性。此外，通过碘掺入的卤化物交换使从绿色到红色的可控发射调谐成为可能。双色发射油墨在柔性基材上数字化印刷成高分辨率图案，在可见光下保持不明显，但在紫外线照射下显示出生动的荧光。这种双模式可见性为下一代防伪技术和信息加密提供了一个安全和通用的平台，展示了钙钛矿NCs在先进功能油墨应用中的潜力。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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