Application of Triplet-Triplet Annihilation Upconversion in Organic Optoelectronic Devices: Advances and Perspectives Gao, Can ; Wong, Wallace W. H. ; Qin, Zhengsheng ; Lo, Shih-Chun ; Namdas, Ebinazar B. ; Dong, Huanli ; Hu, Wenping Abstract Publication: Advanced Materials Pub Date: November 2021 DOI: 10.1002/adma.202100704 Bibcode: 2021AdM....3300704G