Determination of Fe³⁺ upon Special "Upconversion Luminescence" of Dopamine.

ABSTRACT: A promising technique based on the luminescence with long wavelength excitation and short wavelength emission (LExL, λ_ex-L > λ_em) is developed. This LExL is different from traditional upconversion luminescence (UCL). The LExL, namely, special "UCL", is realized by a xenon light source of a common spectrofluorometer. In this work, we found that dopamine (DA) has this LExL phenomenon. The LExL of DA is mainly caused by the excitations of second-order diffraction light (λ_ex-L/2). The two-photon absorption properties of DA have been calculated employing the density functional response theory. The LExL and Stokes luminescence (SL, λ_ex-S < λ_em) of DA both showed static quenching upon the addition of Fe³⁺. Dual-mode luminescence me

SUBMITTER: Cui R 

PROVIDER: S-EPMC6648159 | biostudies-literature | 2019 Jun

REPOSITORIES: biostudies-literature