Organic persistent room-temperature phosphorescent (RTP) materials are promising for applications requiring the secure recording and anti-counterfeiting features owing to their appealing optical properties. Several critical challenges, such as the difficulty to obtain high-quality patterns over large areas and low security levels, need to be addressed to meet the requirements for commercial purpose. Here, we prepared a series of quaternary phosphonium salts with different alkyl chains, which showed interesting organic persistent RTP. The ionic characteristics and the alkyl chains of these molecules impart abundant weak intermolecular interactions. This confers the molecules a high crystallinity, which helps to preserve the persistent RTP properties and cover large areas. Moreover, the RTP lifetime of these organic salts varies over a wide range (1.27 to 884.71 ms) and can be tuned by simply changing the alkyl chain length and counterions, which opens new possibilities in multi-level information encryption applications. It is believed that the engineering of organic salts with tunable persistent RTP lifetimes and large-area printing can promote early-stage demonstrations of security applications into mature commercialization.

有机持久性室温磷光（RTP）材料因其吸引人的光学特性而对于要求安全记录和防伪特性的应用前景广阔。为了满足商业目的的需求，需要解决几个关键挑战，例如难以在大面积上获得高质量图案和较低的安全级别。在这里，我们制备了一系列具有不同烷基链的季phospho盐，这些盐显示出有趣的有机持久性RTP。这些分子的离子特性和烷基链赋予大量的弱分子间相互作用。这使分子具有高结晶度，有助于保持持久的RTP特性并覆盖大面积。此外，这些有机盐的RTP寿命在很宽的范围内变化（1。27至884.71 ms），并且可以通过简单地改变烷基链长和抗衡离子来进行调谐，这为多级信息加密应用打开了新的可能性。可以相信，具有可调节的持久RTP寿命和大面积印刷的有机盐的工程设计可以促进安全应用的早期演示，使其成熟的商业化。