近日，南开大学黄灵团队报道了硒集成七甲基氰氨酸敏化剂实现830nm可激发三重态-三重态湮灭上转换。相关论文于2026年1月12日发表在《美国化学会志》上。

硒集成的七甲川花青素与rubrene（湮灭剂）联用时表现出近红外光敏剂特性，通过三重态-三重态湮灭实现上转换（TTA-UC），使用830 nm激发和557 nm发射，上转换量子产率达1.0%（占吸收的50%）。相较于先前报道的IR806/rubrene体系，Cy2/rubrene的上转换量子产率提升50倍。光物理表征显示，Cy2中硒在花青素骨架的整合显著增强了系间窜越速率至3.22 × 10^{8 s-1}，三重态量子产率达23%，分别较碘代七甲川花青素（Cy1）提升3.5倍和2.6倍。

Cy2优异的三重态激发态特性是其卓越上转换性能的关键。通过旋涂Cy2/rubrene混合溶液，制备了830 nm响应的单层TTA-UC薄膜，兼具优异透光率和明亮上转换发光。该金属自由小分子体系实现了最长波长光激发，在光伏、生物光子学领域具有重要应用前景。

附：英文原文

Title: 830 nm-Excitable Triplet–Triplet Annihilation Upconversion Achieved by a Selenium-Integrated Heptamethine Cyanine Sensitizer

Author: Dong-Xue Guo, Lin-Han Jiang, Shaowen Chu, Yulin Sha, Ying-Ze Li, Ran Li, Jia-Yao Li, Yu-Qian Yang, Ming-Yu Zhang, Hong-Juan Feng, Zi-Hui Zhang, Ling Huang

Issue&Volume: January 12, 2026

Abstract: We demonstrated that the selenium-integrated heptamethine cyanine acts as a near-infrared photosensitizer when combined with rubrene (annihilator), achieving triplet–triplet annihilation upconversion (TTA-UC) with 830 nm excitation and 557 nm emission and an upconversion quantum yield of up to 1.0% (out of 50%). Compared to the previously reported TTA-UC pair (IR806/rubrene), the upconversion quantum yield of Cy2/rubrene improves 50-fold. Photophysical characterization indicates that the integration of selenium into the cyanine skeleton in Cy2 increases the intersystem crossing rate and triplet excited state quantum yield to 3.22 × 108 s–1 and 23%, respectively, which is significantly enhanced 3.5-fold and 2.6-fold compared to iodine-substituted heptamethine cyanine (Cy1). The superior triplet excited state properties of Cy2 are crucial factors underlying the exceptional upconversion performance. Eventually, via spin coating the mixture of Cy2/rubrene solution, we fabricated the 830 nm responsive single-layer TTA-UC film, which exhibited excellent transmittance and bright upconversion luminescence. These findings are for the longest wavelength light-excitable metal-free small-molecule-based TTA-UC system, significantly promoting photon upconversion applications in solar energy harvesting and biophotonics.

DOI: 10.1021/jacs.5c15902

Source: https://pubs.acs.org/doi/abs/10.1021/jacs.5c15902