Photon Upconversion from Near-Infrared to Blue Light with TIPS-Anthracene as an Efficient Triplet–Triplet Annihilator - Nishimura, Naoyuki; Gray, Victor; Allardice, Jesse R; Zhang, Zhilong; Pershin, Anton; Beljonne, David; Rao, Akshay (ACS materials letters, 2019)