期刊
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
卷 13, 期 8, 页码 2007-2011出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpclett.2c00125
关键词
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类别
资金
- National Natural Science Foundation of China [81530052, 81727809]
This study proposes a new method to obtain the Stern-Volmer constant (K-SV) by steady fluorescence and finds that the oxygen content can influence the fluorescence intensity through the quenching of the excited triplet state (T-1). The research not only offers a convenient way to achieve K-SV but also advances the field of regulable fluorescence correlation.
The achievement of the Stern-Volmer constant (K-SV) 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 K-SV by steady fluorescence based on the population correlation between the excited triplet state (T-1) and the singlet excited state (S-1). 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 T-1 based on its sequent change of fluorescence intensity; K-SV similar to 28 kPa(-1) can be obtained theoretically for HMME. Our investigation not only offers a promising method of achieving K-SV conveniently by steady fluorescence but also enlightens the advances of regulable fluorescence correlation.
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