Oxygen-Varying Correlated Fluorescence for Determining the Stern–Volmer Constant of Porphyrin

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Abstract
The achievement of the Stern–Volmer constant (KSV) of porphyrin, a parameter to describe the ability of energy transfer to oxygen, enables us to understand and engineer the functionalities of porphyrin. In this study, we propose a new method to obtain KSV by steady fluorescence based on the population correlation between the excited triplet state (T1) and the singlet excited state (S1). Nonlinear fluorescence intensity of porphyrin [hematoporphyrin monomethyl ether (HMME)] as a function of pump power is observed, and this nonlinearity is oxygen-concentration-dependent. These observations originated from the population correlation, where more intense pump power introduces a stronger population correlation. Most importantly, we have found that the oxygen content can influence this correlation via the quenching of T1 based on its sequent change of fluorescence intensity; KSV ∼ 28 kPa–1 can be obtained theoretically for HMME. Our investigation not only offers a promising method of achieving KSV conveniently by steady fluorescence but also enlightens the advances of regulable fluorescence correlation.
Funding Information
  • National Natural Science Foundation of China (81530052, 81727809)

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