Abstract
Oxygen sensing properties of a luminescent material gadolinium labeled hematoporphyrin monomethyl ether (Gd-HMME) based on filter paper were studied. Photoluminescence of Gd-HMME at 712nm was confirmed to be phosphorescence by a time-resolved spectroscopic analysis and its dependence on oxygen. Quantum yield of the phosphorescence was determined to be 0.014 in air saturated methanol solution (λexc=532nm). A linear range was found from 10% to 100% oxygen concentration in Stern–Volmer plots for Gd-HMME based on filter paper. Fast response time, recovery time (t↓, 0.4±0.2s; t↑, 1.4±0.2s) and high photostability were achieved. Our results indicate that Gd-HMME is a promising indicator for optical oxygen sensing.
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