Sun Tianming, Zhao Yining, Fan Yujia, Guo Xiaoyu, Tang Zhexin, Wang Mingqing
UCL Institute for Materials Discovery, University College London Roberts Building, Malet Place London WC1E 7JE UK
Nanoscale Adv. 2025 Sep 9. doi: 10.1039/d5na00602c.
We present a scalable, ambient-air synthesis of CsPbBr 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 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.
我们展示了一种可扩展的、在环境空气中合成具有增强光学性能和环境稳定性的CsPbBr钙钛矿纳米晶体（NC）墨水的方法，该方法通过使用油胺（OAm）进行合成后表面改性实现。对OAm浓度的系统调节导致了粒径减小、结晶度提高和有效缺陷钝化的纳米晶体，产生了93.1%的峰值光致发光量子产率（PLQY）和84.02 ns的延长载流子寿命。与未改性的样品相比，这些改性的纳米晶体表现出显著改善的长期结构稳定性。此外，卤化物交换——引入碘实现了从绿色到红色的可控发射调谐。双色发射墨水被数字印刷到柔性基板上的高分辨率图案中，这些图案在可见光下不显眼，但在紫外光照射下显示出鲜艳的荧光。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且通用的平台，展示了钙钛矿纳米晶体在先进功能墨水应用中的潜力。
