School of Materials Sciences and Engineering , University of Science and Technology Beijing , Beijing 100083 , P. R. China.
Key Laboratory of Cosmetic, China National Light Industry , Beijing Technology and Business University , Beijing 100048 , P. R. China.
ACS Appl Mater Interfaces. 2018 Aug 22;10(33):27875-27884. doi: 10.1021/acsami.8b10517. Epub 2018 Aug 10.
The increasing demands for optical anti-counterfeiting technology require the development of versatile luminescent materials with multiple models and tunable photoluminescence. Herein, the combination of luminescent perovskite nanocrystals and lanthanide-based metal-organic frameworks (Ln-MOFs) has been developed to offer such a high-tech anti-counterfeiting solution. The hybrid materials have been fabricated via the encapsulation of perovskite CHNHPbBr nanocrystals in europium-based metal-organic frameworks (Eu-MOFs) and they display multistage anti-counterfeiting behavior. CHNHPbBr@Eu-MOF hybrids were developed in a two-step process, where the PbBr@Eu-MOF precursor was formed first and, then, the composites can be formed quickly by the addition of CHNHBr into the precursors. Accordingly, the hybrid composites exhibited both excitation wavelength and temperature-dependent luminescence properties in the form of powders or films. Furthermore, the photoluminescence of the CHNHPbBr@Eu-MOF composites can be quenched and recovered through water immersion and CHNHBr conversion, and the anti-counterfeiting applications have also been discussed. Therefore, this finding will open the opportunity to fabricate the hybrid materials with controlled photoluminescence properties, and it also acts as the emerging anti-counterfeiting materials in versatile fields.
防伪技术对光学防伪的需求日益增长，这就需要开发具有多种模式和可调谐光致发光性能的多功能发光材料。在此，通过将发光钙钛矿纳米晶体与镧系金属-有机骨架（Ln-MOFs）相结合，为这一高科技防伪解决方案提供了可能。通过将钙钛矿 CHNHPbBr 纳米晶体封装在铕基金属-有机骨架（Eu-MOFs）中，可以制备出这种混合材料，其具有多级防伪性能。CHNHPbBr@Eu-MOF 杂化材料是通过两步法制备的，首先形成 PbBr@Eu-MOF 前体，然后通过将 CHNHBr 添加到前体中快速形成复合材料。因此，复合粉末或薄膜材料均表现出了激发波长和温度依赖性的发光性能。此外，CHNHPbBr@Eu-MOF 复合材料的光致发光可以通过水浸泡和 CHNHBr 转化进行猝灭和恢复，并且还讨论了其防伪应用。因此，这一发现为制备具有可控光致发光性能的混合材料提供了机会，同时也为多功能领域的新兴防伪材料开辟了道路。
