Lanthanide-doped inorganic nanoparticles turn molecular triplet excitons bright 1

International Research Center for Advanced Photonics, Zhejiang University, Hangzhou, 310027, China. 13 Department of Chemical System Engineering, The University of Tokyo, Tokyo, 113-8656, Japan. 14 Laboratory for Chemistry of Novel Materials, University of Mons, Place du Parc 20, B-7000, Mons, Belgium. 15 School of Chemistry and Material Science, Heilongjiang University, Harbin 150080, China. 16 Department of Chemistry, University of California, Riverside, CA, 92521, USA. 17 Department of Physics, Indian Institute of Technology Jodhpur, Karwar, Jodhpur342037, India. 18 The N.1 Institute for Health, National University of Singapore, Singapore 117456, Singapore. 19 20

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