Zhang Qipeng, Xu Shihao, Zhang Lanpeng, Yang Liang, Jiang Changlong
Institute of Solid State Physics, Hefei Institutes of Physical Science, Chinese Academy of Sciences, Hefei, Anhui, 230031, China.
Department of Chemistry, University of Science and Technology of China, Hefei, Anhui, 230026, China.
Adv Sci (Weinh). 2024 May;11(18):e2400781. doi: 10.1002/advs.202400781. Epub 2024 Mar 29.
Advancing a metal-free room temperature phosphorescent (RTP) material that exhibits multicolor emission, remarkable RTP lifetime, and high quantum yield still faces the challenge of achieving intersystem crossing between singly and triplet excited states, as well as the rapid decay of triplet excited states due to nonradiative losses. In this study, a novel strategy is proposed to address these limitations by incorporating o-phenylenediamine, which generates multiple luminescent centers, and long-chain polyacrylic acid to synthesize carbonized polymer dots (CPDs). These CPDs are then embedded in a rigid BO matrix, effectively limiting nonradiative losses through the synergistic effects of polymer cross-linking and the rigid matrix. The resulting CPD-based materials exhibit remarkable ultralong phosphorescence in shades of blue and lime green, with a visible lifetime of up to 49 s and a high phosphorescence quantum yield. Simultaneously, this study demonstrates the practical applicability of these excellent material properties in anti-counterfeiting and information encryption.
开发一种无金属室温磷光（RTP）材料，使其具有多色发射、显著的RTP寿命和高量子产率，仍然面临着实现单重态和三重态激发态之间的系间窜越以及由于非辐射损失导致的三重态激发态快速衰减的挑战。在本研究中，提出了一种新策略来解决这些限制，即通过引入能产生多个发光中心的邻苯二胺和长链聚丙烯酸来合成碳化聚合物点（CPD）。然后将这些CPD嵌入刚性BO基质中，通过聚合物交联和刚性基质的协同作用有效地限制非辐射损失。所得的基于CPD的材料在蓝色和石灰绿色调中表现出显著的超长磷光，可见寿命长达49秒，磷光量子产率高。同时，本研究证明了这些优异材料性能在防伪和信息加密中的实际适用性。
