School of Chemical Engineering and Technology, Tianjin University, Tianjin, 300350, P. R. China.
Zhejiang Institute of Tianjin University, Shaoxing, 312300, P. R. China.
Nat Commun. 2023 Jul 13;14(1):4164. doi: 10.1038/s41467-023-39795-6.
Although room temperature phosphorescence (RTP) materials have been widely investigated, it is still a great challenge to improve the performance of RTP materials by promoting triplet exciton generation and stabilization. In this study, an in-situ derivation strategy was proposed to construct efficient RTP materials by in-situ deriving guest molecules and forming a rigid matrix during co-pyrolysis of guest molecules and urea. Characterizations and theoretical calculations revealed that the generated derivatives were beneficial for promoting intersystem crossing (ISC) to produce more triplet excitons, while rigid matrix could effectively suppress the non-radiative transition of triplet excitons. Thus, the in-situ derivation strategy was concluded to simultaneously promote the generation and stabilization of triplet excitons. With this method, the ultralong lifetime of RTP materials could reach up to 5.33 s and polychromatic RTP materials were easily achieved. Moreover, the potential applications of the RTP materials in reprocessing or editable anti-counterfeiting were successfully demonstrated.
虽然室温磷光（RTP）材料已经得到了广泛的研究，但通过促进三重态激子的产生和稳定来提高 RTP 材料的性能仍然是一个巨大的挑战。在本研究中，提出了一种原位衍生策略，通过在客体分子和尿素共热解过程中原位衍生客体分子并形成刚性基质来构建高效的 RTP 材料。通过表征和理论计算揭示，所生成的衍生物有利于促进系间窜越（ISC）以产生更多的三重态激子，而刚性基质可以有效地抑制三重态激子的非辐射跃迁。因此，可以得出结论，原位衍生策略可以同时促进三重态激子的产生和稳定。通过这种方法，RTP 材料的超长寿命可达到 5.33s，并且很容易实现多色 RTP 材料。此外，成功地证明了 RTP 材料在再加工或可编辑防伪方面的潜在应用。
