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(A) Emission spectra of the NaYF4:Yb,Tm nanoparticles (i), the absorption of the oxygen probe [Ir(CS)2(acac)] (ii), emission spectrum of [Ir(CS)2(acac)] (iii); (B) Visible emission spectra of an ethyl cellulose sensor film containing the NaYF4:Yb,Tm UCNPs and the oxygen probe [Ir(CS)2(acac)]; (C1) in argon and (C2) argon containing 20% oxygen. Reproduced with permission from reference 94.
