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NIR and UV exposure of systems comprising upconversion nanoparticles ( UCNP ) based on NaYF 4 :Tm/Yb@NaYF 4 , a sensitizer absorbing either in the blue or UV region, and an onium salt with weak coordinating anion resulted in formation of conjugate acid (con‐H + ). That was namely Ivocerin (di(4‐methoxybenzoyl)diethylgermane), ITX (2‐iso‐propyl thioxanthone), anthracene, pyrene, rubrene, camphore quinone, and a strong fluorescent coumarin (1,1,6,6,8‐pentamethyl‐2,3,5,6‐tetrahyhdro‐1 H ,4 H ‐11‐oxa‐3 a ‐aza‐benzo[ de ]anthracene‐10‐one). Quantification occurred by treatment with Rhodamine B lactone whose color switched to intensive red after photolytic formation of con‐H + . Exposure with a NIR laser at 980 nm resulted in less con‐H +  compared to 395 nm where all sensitizers absorb radiation.  UCNP  did not mainly interfered formation of con‐H + . The different rates obtained in both experiments responsibly explain the failure and success to initiate polymerization of epoxides applying ether 980 nm or 395 nm excitation, respectively.

Mediated Generation of Conjugate Acid by UV and Blue Sensitizers with Upconversion Nanoparticles at 980 nm