Open- and Closed-Shell Roles of Sensitizer and Annihilator in Pseudo-Single Component Mixtures for Upconversion - Kieran D. Richards; Wenzhao Wang; Philipp Thielert; James D. Green; John M. Hudson; Claire Tonnelé; David Casanova; Yoann Olivier; Timothy J. H. Hele; Sabine Richert; Feng Li; Emrys W. Evans (Journal of the American Chemical Society, 2026)