830 nm-Excitable Triplet–Triplet Annihilation Upconversion Achieved by a Selenium-Integrated Heptamethine Cyanine Sensitizer - 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 (Journal of the American Chemical Society, 2026)