Abstract

The effects of oxygen over a wide concentration range on the solid-matrix phosphorescence (SMP) of perdeuterated phenanthrene (D<sub>10</sub>) adsorbed on partially hydrophobic paper (1PS) were investigated. The SMP lifetime results of D<sub>10</sub> adsorbed on Whatman 1PS paper and Whatman No. 1 paper were considered, and the SMP intensities and SMP lifetimes of D<sub>10</sub> on 1PS paper were compared. The SMP quenching model employed showed that diffusional quenching was not very extensive for D<sub>10</sub> adsorbed on both types of paper. In addition, a large fraction of the D<sub>10</sub> phosphor molecules did not undergo diffusional quenching in either paper. The changes in the SMP intensities for D<sub>10</sub> adsorbed on 1PS paper were much greater than the corresponding SMP lifetime changes, which indicated that static quenching by oxygen was very effective for D<sub>10</sub> on 1PS paper. Also, the SMP intensity data indicated that a relatively large fraction of the D<sub>10</sub> molecules were not quenched statically. The quenching data were interpreted and compared with equations that permitted both linear and nonlinear models to be employed.

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