Kang Chunyuan, Tao Songyuan, Yang Fan, Zheng Chengyu, Qu Zexing, Yang Bai
State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University Changchun 130012 (P. R. China).
Institute of Theoretical Chemistry, College of Chemistry, Jilin University, Changchun, 130023, P. R. China.
Angew Chem Int Ed Engl. 2024 Jan 2;63(1):e202316527. doi: 10.1002/anie.202316527. Epub 2023 Nov 30.
Developing a facile strategy to realize fine-tuning of phosphorescence color in time-dependent room temperature phosphorescence (RTP) materials is essential but both theoretically and practically rarely exploited. Through simultaneously confining carboxyl dimer association and isolated carboxyl into the particle via a simple hydrothermal treatment of polyacrylic acid, a dual-peak emission of red phosphorescence (645 nm) and green phosphorescence (550 nm) was observed from carbonized polymer dots (CPDs). The ratio of the two luminescent species can be well regulated by hydrochloric acid inhibiting the dissociation of carboxyl to promote hydrogen bond. Due to comparable but different lifetimes, color-tunable time-dependent RTP with color changing from yellow to green or orange to green were obtained. Based on the crosslinking enhanced emission effect, the phosphorescence visible time was even extended to 7 s through introducing polyethylenimide. This study not only proposes a novel and facile method for developing CPDs with color-tunable time-dependent RTP, but also provides a bran-new non-conjugated red phosphorescence unit and its definite structure.
开发一种简便的策略来实现对室温磷光（RTP）材料中磷光颜色的时间依赖性精细调节至关重要，但在理论和实践上都很少被探索。通过对聚丙烯酸进行简单的水热处理，将羧基二聚体缔合和孤立的羧基同时限制在颗粒中，从碳化聚合物点（CPD）中观察到了红色磷光（645nm）和绿色磷光（550nm）的双峰发射。两种发光物种的比例可以通过盐酸抑制羧基解离以促进氢键来很好地调节。由于寿命相当但不同，获得了颜色从黄色变为绿色或从橙色变为绿色的时间依赖性颜色可调RTP。基于交联增强发射效应，通过引入聚乙烯亚胺，磷光可见时间甚至延长到了7秒。本研究不仅提出了一种开发具有时间依赖性颜色可调RTP的CPD的新颖简便方法，还提供了一种全新的非共轭红色磷光单元及其明确结构。
