In this article, morpholine, a non-conjugated heterocycle, is embedded into π system to construct single-component organic room temperature phosphorescence (RTP) luminogens. The effect of morpholine on intermolecular interaction, crystal packing modes, and RTP performance is investigated systematically. The experimental and theoretical calculation results illustrate the versatility of morpholine in promoting the n-π* transition and intensifying the intermolecular interactions, which not only enhances the generation of triplet excitons, but also suppresses the nonradiative decay of triplet excitons. Impressively, TMPh containing three morpholine units shows an ultralong lifetime of 1.03 s and a visible afterglow up to 10 s. The unique dual delayed emission and long afterglow property allow potential application of morpholine derivatives in data encryption, and the time-dependent color change of afterglow emission is realized after removing the excitation source, providing a high-level data security. This article provides a new perspective for the design of purely organic RTP system without utilization of metal, or even any heavy atoms.

在这篇文章中，吗啉，一种非共轭杂环，被嵌入到π系统中，以构建单组分有机室温磷光（RTP）发光体。系统研究了吗啉对分子间相互作用、晶体堆积模式和 RTP 性能的影响。实验和理论计算结果说明吗啉在促进n-π*跃迁和加强分子间相互作用方面的多功能性，不仅可以增强三线态激子的产生，还可以抑制三线态激子的非辐射衰变。令人印象深刻的是，包含三个吗啉单元的 TMPh 显示出 1.03 秒的超长寿命和长达 10 秒的可见余辉。独特的双重延迟发射和长余辉特性使得吗啉衍生物在数据加密方面具有潜在的应用价值，并且在去除激发源后实现了余辉发射随时间变化的颜色，提供了高水平的数据安全性。本文为不使用金属甚至任何重原子的纯有机RTP系统的设计提供了新的视角。