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Nonlinear phosphorescence quenching mechanism of gadolinium labeled hematoporphyrin monomethyl ether (Gd-HMME) by oxygen on the filter paper was studied. The intensity Stern–Volmer plot was found to be approximately linear for oxygen concentration from 10% to 100%, but showing a negative curvature from 0% to 10%. The lifetime plot has similar changing trend. The intensity plot is slightly higher than...
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